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有人采用这样一种方式封装可重用的自定义view

有人采用这样一种方式封装可重用的自定义view

作者: brzhang | 来源:发表于2017-11-27 16:32 被阅读15次
    public class MessageHeader extends LinearLayout implements OnClickListener, OnLongClickListener {
        private Context mContext;
        private TextView mFromView;
        private TextView mSenderView;
        private TextView mDateView;
        private TextView mToView;
        private TextView mToLabel;
        private TextView mCcView;
        private TextView mCcLabel;
        private TextView mBccView;
        private TextView mBccLabel;
        private TextView mSubjectView;
        private MessageCryptoStatusView mCryptoStatusIcon;
    
        private View mChip;
        private CheckBox mFlagged;
        private int defaultSubjectColor;
        private TextView mAdditionalHeadersView;
        private View mAnsweredIcon;
        private View mForwardedIcon;
        private Message mMessage;
        private Account mAccount;
        private FontSizes mFontSizes = K9.getFontSizes();
        private Contacts mContacts;
        private SavedState mSavedState;
    
        private MessageHelper mMessageHelper;
        private ContactPictureLoader mContactsPictureLoader;
        private ContactBadge mContactBadge;
    
        private OnLayoutChangedListener mOnLayoutChangedListener;
        private OnCryptoClickListener onCryptoClickListener;
    
        /**
         * Pair class is only available since API Level 5, so we need
         * this helper class unfortunately
         */
        private static class HeaderEntry {
            public String label;
            public String value;
    
            public HeaderEntry(String label, String value) {
                this.label = label;
                this.value = value;
            }
        }
    
        public MessageHeader(Context context, AttributeSet attrs) {
            super(context, attrs);
            mContext = context;
            mContacts = Contacts.getInstance(mContext);
        }
    
        @Override
        protected void onFinishInflate() {
            super.onFinishInflate();
    
            mAnsweredIcon = findViewById(R.id.answered);
            mForwardedIcon = findViewById(R.id.forwarded);
            mFromView = (TextView) findViewById(R.id.from);
            mSenderView = (TextView) findViewById(R.id.sender);
            mToView = (TextView) findViewById(R.id.to);
            mToLabel = (TextView) findViewById(R.id.to_label);
            mCcView = (TextView) findViewById(R.id.cc);
            mCcLabel = (TextView) findViewById(R.id.cc_label);
            mBccView = (TextView) findViewById(R.id.bcc);
            mBccLabel = (TextView) findViewById(R.id.bcc_label);
    
            mContactBadge = (ContactBadge) findViewById(R.id.contact_badge);
    
            mSubjectView = (TextView) findViewById(R.id.subject);
            mAdditionalHeadersView = (TextView) findViewById(R.id.additional_headers_view);
            mChip = findViewById(R.id.chip);
            mDateView = (TextView) findViewById(R.id.date);
            mFlagged = (CheckBox) findViewById(R.id.flagged);
    
            defaultSubjectColor = mSubjectView.getCurrentTextColor();
            mFontSizes.setViewTextSize(mSubjectView, mFontSizes.getMessageViewSubject());
            mFontSizes.setViewTextSize(mDateView, mFontSizes.getMessageViewDate());
            mFontSizes.setViewTextSize(mAdditionalHeadersView, mFontSizes.getMessageViewAdditionalHeaders());
    
            mFontSizes.setViewTextSize(mFromView, mFontSizes.getMessageViewSender());
            mFontSizes.setViewTextSize(mToView, mFontSizes.getMessageViewTo());
            mFontSizes.setViewTextSize(mToLabel, mFontSizes.getMessageViewTo());
            mFontSizes.setViewTextSize(mCcView, mFontSizes.getMessageViewCC());
            mFontSizes.setViewTextSize(mCcLabel, mFontSizes.getMessageViewCC());
            mFontSizes.setViewTextSize(mBccView, mFontSizes.getMessageViewBCC());
            mFontSizes.setViewTextSize(mBccLabel, mFontSizes.getMessageViewBCC());
    
            mFromView.setOnClickListener(this);
            mToView.setOnClickListener(this);
            mCcView.setOnClickListener(this);
            mBccView.setOnClickListener(this);
    
            mFromView.setOnLongClickListener(this);
            mToView.setOnLongClickListener(this);
            mCcView.setOnLongClickListener(this);
            mBccView.setOnLongClickListener(this);
    
            mCryptoStatusIcon = (MessageCryptoStatusView) findViewById(R.id.crypto_status_icon);
            mCryptoStatusIcon.setOnClickListener(this);
    
            mMessageHelper = MessageHelper.getInstance(mContext);
    
            hideAdditionalHeaders();
        }
    
        @Override
        public void onClick(View view) {
            switch (view.getId()) {
                case R.id.from: {
                    onAddSenderToContacts();
                    break;
                }
                case R.id.to:
                case R.id.cc:
                case R.id.bcc: {
                    expand((TextView)view, ((TextView)view).getEllipsize() != null);
                    layoutChanged();
                    break;
                }
                case R.id.crypto_status_icon: {
                    onCryptoClickListener.onCryptoClick();
                    break;
                }
            }
        }
    
        @Override
        public boolean onLongClick(View view) {
            switch (view.getId()) {
                case R.id.from:
                    onAddAddressesToClipboard(mMessage.getFrom());
                    break;
                case R.id.to:
                    onAddRecipientsToClipboard(Message.RecipientType.TO);
                    break;
                case R.id.cc:
                    onAddRecipientsToClipboard(Message.RecipientType.CC);
                    break;
            }
    
            return true;
        }
    
        private void onAddSenderToContacts() {
            if (mMessage != null) {
                try {
                    final Address senderEmail = mMessage.getFrom()[0];
                    mContacts.createContact(senderEmail);
                } catch (Exception e) {
                    Timber.e(e, "Couldn't create contact");
                }
            }
        }
    
        public String createMessage(int addressesCount) {
            return mContext.getResources().getQuantityString(R.plurals.copy_address_to_clipboard, addressesCount);
        }
    
        private void onAddAddressesToClipboard(Address[] addresses) {
            String addressList = Address.toString(addresses);
    
            ClipboardManager clipboardManager = ClipboardManager.getInstance(mContext);
            clipboardManager.setText("addresses", addressList);
    
            Toast.makeText(mContext, createMessage(addresses.length), Toast.LENGTH_LONG).show();
        }
    
        private void onAddRecipientsToClipboard(Message.RecipientType recipientType) {
            onAddAddressesToClipboard(mMessage.getRecipients(recipientType));
        }
    
        public void setOnFlagListener(OnClickListener listener) {
            mFlagged.setOnClickListener(listener);
        }
    
        public boolean additionalHeadersVisible() {
            return (mAdditionalHeadersView != null &&
                    mAdditionalHeadersView.getVisibility() == View.VISIBLE);
        }
    
        /**
         * Clear the text field for the additional headers display if they are
         * not shown, to save UI resources.
         */
        private void hideAdditionalHeaders() {
            mAdditionalHeadersView.setVisibility(View.GONE);
            mAdditionalHeadersView.setText("");
        }
    
    
        /**
         * Set up and then show the additional headers view. Called by
         * {@link #onShowAdditionalHeaders()}
         * (when switching between messages).
         */
        private void showAdditionalHeaders() {
            Integer messageToShow = null;
            try {
                // Retrieve additional headers
                List<HeaderEntry> additionalHeaders = getAdditionalHeaders(mMessage);
                if (!additionalHeaders.isEmpty()) {
                    // Show the additional headers that we have got.
                    populateAdditionalHeadersView(additionalHeaders);
                    mAdditionalHeadersView.setVisibility(View.VISIBLE);
                } else {
                    // All headers have been downloaded, but there are no additional headers.
                    messageToShow = R.string.message_no_additional_headers_available;
                }
            } catch (Exception e) {
                messageToShow = R.string.message_additional_headers_retrieval_failed;
            }
            // Show a message to the user, if any
            if (messageToShow != null) {
                Toast toast = Toast.makeText(mContext, messageToShow, Toast.LENGTH_LONG);
                toast.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL, 0, 0);
                toast.show();
            }
    
        }
    
        public void populate(final Message message, final Account account) {
            final Contacts contacts = K9.showContactName() ? mContacts : null;
            final CharSequence from = MessageHelper.toFriendly(message.getFrom(), contacts);
            final CharSequence to = MessageHelper.toFriendly(message.getRecipients(Message.RecipientType.TO), contacts);
            final CharSequence cc = MessageHelper.toFriendly(message.getRecipients(Message.RecipientType.CC), contacts);
            final CharSequence bcc = MessageHelper.toFriendly(message.getRecipients(Message.RecipientType.BCC), contacts);
    
            Address[] fromAddrs = message.getFrom();
            Address[] toAddrs = message.getRecipients(Message.RecipientType.TO);
            Address[] ccAddrs = message.getRecipients(Message.RecipientType.CC);
            boolean fromMe = mMessageHelper.toMe(account, fromAddrs);
    
            Address counterpartyAddress = null;
            if (fromMe) {
                if (toAddrs.length > 0) {
                    counterpartyAddress = toAddrs[0];
                } else if (ccAddrs.length > 0) {
                    counterpartyAddress = ccAddrs[0];
                }
            } else if (fromAddrs.length > 0) {
                counterpartyAddress = fromAddrs[0];
            }
    
            /* We hide the subject by default for each new message, and MessageTitleView might show
             * it later by calling showSubjectLine(). */
            boolean newMessageShown = mMessage == null || !mMessage.getUid().equals(message.getUid());
            if (newMessageShown) {
                mSubjectView.setVisibility(GONE);
            }
    
            mMessage = message;
            mAccount = account;
    
            if (K9.showContactPicture()) {
                mContactBadge.setVisibility(View.VISIBLE);
                mContactsPictureLoader = ContactPicture.getContactPictureLoader(mContext);
            }  else {
                mContactBadge.setVisibility(View.GONE);
            }
    
            if (shouldShowSender(message)) {
                mSenderView.setVisibility(VISIBLE);
                String sender = getResources().getString(R.string.message_view_sender_label,
                        MessageHelper.toFriendly(message.getSender(), contacts));
                mSenderView.setText(sender);
            } else {
                mSenderView.setVisibility(View.GONE);
            }
    
            final String subject = message.getSubject();
            if (TextUtils.isEmpty(subject)) {
                mSubjectView.setText(mContext.getText(R.string.general_no_subject));
            } else {
                mSubjectView.setText(subject);
            }
            mSubjectView.setTextColor(0xff000000 | defaultSubjectColor);
    
            String dateTime = DateUtils.formatDateTime(mContext,
                    message.getSentDate().getTime(),
                    DateUtils.FORMAT_SHOW_DATE
                    | DateUtils.FORMAT_ABBREV_ALL
                    | DateUtils.FORMAT_SHOW_TIME
                    | DateUtils.FORMAT_SHOW_YEAR);
            mDateView.setText(dateTime);
    
            if (K9.showContactPicture()) {
                if (counterpartyAddress != null) {
                    Utility.setContactForBadge(mContactBadge, counterpartyAddress);
                    mContactsPictureLoader.loadContactPicture(counterpartyAddress, mContactBadge);
                } else {
                    mContactBadge.setImageResource(R.drawable.ic_contact_picture);
                }
            }
    
            mFromView.setText(from);
    
            updateAddressField(mToView, to, mToLabel);
            updateAddressField(mCcView, cc, mCcLabel);
            updateAddressField(mBccView, bcc, mBccLabel);
            mAnsweredIcon.setVisibility(message.isSet(Flag.ANSWERED) ? View.VISIBLE : View.GONE);
            mForwardedIcon.setVisibility(message.isSet(Flag.FORWARDED) ? View.VISIBLE : View.GONE);
            mFlagged.setChecked(message.isSet(Flag.FLAGGED));
    
            mChip.setBackgroundColor(mAccount.getChipColor());
    
            setVisibility(View.VISIBLE);
    
            if (mSavedState != null) {
                if (mSavedState.additionalHeadersVisible) {
                    showAdditionalHeaders();
                }
                mSavedState = null;
            } else {
                hideAdditionalHeaders();
            }
        }
    
        public static boolean shouldShowSender(Message message) {
            Address[] from = message.getFrom();
            Address[] sender = message.getSender();
    
            if (sender == null || sender.length == 0) {
                return false;
            }
            return !Arrays.equals(from, sender);
        }
    
        public void hideCryptoStatus() {
            mCryptoStatusIcon.setVisibility(View.GONE);
        }
    
        public void setCryptoStatusLoading() {
            mCryptoStatusIcon.setVisibility(View.VISIBLE);
            mCryptoStatusIcon.setEnabled(false);
            mCryptoStatusIcon.setCryptoDisplayStatus(MessageCryptoDisplayStatus.LOADING);
        }
    
        public void setCryptoStatusDisabled() {
            mCryptoStatusIcon.setVisibility(View.VISIBLE);
            mCryptoStatusIcon.setEnabled(false);
            mCryptoStatusIcon.setCryptoDisplayStatus(MessageCryptoDisplayStatus.DISABLED);
        }
    
        public void setCryptoStatus(MessageCryptoDisplayStatus displayStatus) {
            mCryptoStatusIcon.setVisibility(View.VISIBLE);
            mCryptoStatusIcon.setEnabled(true);
            mCryptoStatusIcon.setCryptoDisplayStatus(displayStatus);
        }
    
        public void onShowAdditionalHeaders() {
            int currentVisibility = mAdditionalHeadersView.getVisibility();
            if (currentVisibility == View.VISIBLE) {
                hideAdditionalHeaders();
                expand(mToView, false);
                expand(mCcView, false);
            } else {
                showAdditionalHeaders();
                expand(mToView, true);
                expand(mCcView, true);
            }
            layoutChanged();
        }
    
    
        private void updateAddressField(TextView v, CharSequence text, View label) {
            boolean hasText = !TextUtils.isEmpty(text);
    
            v.setText(text);
            v.setVisibility(hasText ? View.VISIBLE : View.GONE);
            label.setVisibility(hasText ? View.VISIBLE : View.GONE);
        }
    
        /**
         * Expand or collapse a TextView by removing or adding the 2 lines limitation
         */
        private void expand(TextView v, boolean expand) {
           if (expand) {
               v.setMaxLines(Integer.MAX_VALUE);
               v.setEllipsize(null);
           } else {
               v.setMaxLines(2);
               v.setEllipsize(android.text.TextUtils.TruncateAt.END);
           }
        }
    
        private List<HeaderEntry> getAdditionalHeaders(final Message message)
        throws MessagingException {
            List<HeaderEntry> additionalHeaders = new LinkedList<HeaderEntry>();
    
            Set<String> headerNames = new LinkedHashSet<String>(message.getHeaderNames());
            for (String headerName : headerNames) {
                String[] headerValues = message.getHeader(headerName);
                for (String headerValue : headerValues) {
                    additionalHeaders.add(new HeaderEntry(headerName, headerValue));
                }
            }
            return additionalHeaders;
        }
    
        /**
         * Set up the additional headers text view with the supplied header data.
         *
         * @param additionalHeaders List of header entries. Each entry consists of a header
         *                          name and a header value. Header names may appear multiple
         *                          times.
         *                          <p/>
         *                          This method is always called from within the UI thread by
         *                          {@link #showAdditionalHeaders()}.
         */
        private void populateAdditionalHeadersView(final List<HeaderEntry> additionalHeaders) {
            SpannableStringBuilder sb = new SpannableStringBuilder();
            boolean first = true;
            for (HeaderEntry additionalHeader : additionalHeaders) {
                if (!first) {
                    sb.append("\n");
                } else {
                    first = false;
                }
                StyleSpan boldSpan = new StyleSpan(Typeface.BOLD);
                SpannableString label = new SpannableString(additionalHeader.label + ": ");
                label.setSpan(boldSpan, 0, label.length(), 0);
                sb.append(label);
                sb.append(MimeUtility.unfoldAndDecode(additionalHeader.value));
            }
            mAdditionalHeadersView.setText(sb);
        }
    
        @Override
        public Parcelable onSaveInstanceState() {
            Parcelable superState = super.onSaveInstanceState();
    
            SavedState savedState = new SavedState(superState);
    
            savedState.additionalHeadersVisible = additionalHeadersVisible();
    
            return savedState;
        }
    
        @Override
        public void onRestoreInstanceState(Parcelable state) {
            if(!(state instanceof SavedState)) {
                super.onRestoreInstanceState(state);
                return;
            }
    
            SavedState savedState = (SavedState)state;
            super.onRestoreInstanceState(savedState.getSuperState());
    
            mSavedState = savedState;
        }
    
        static class SavedState extends BaseSavedState {
            boolean additionalHeadersVisible;
    
            public static final Parcelable.Creator<SavedState> CREATOR =
                    new Parcelable.Creator<SavedState>() {
                @Override
                public SavedState createFromParcel(Parcel in) {
                    return new SavedState(in);
                }
    
                @Override
                public SavedState[] newArray(int size) {
                    return new SavedState[size];
                }
            };
    
    
            SavedState(Parcelable superState) {
                super(superState);
            }
    
            private SavedState(Parcel in) {
                super(in);
                this.additionalHeadersVisible = (in.readInt() != 0);
            }
    
            @Override
            public void writeToParcel(Parcel out, int flags) {
                super.writeToParcel(out, flags);
                out.writeInt((this.additionalHeadersVisible) ? 1 : 0);
            }
        }
    
        public interface OnLayoutChangedListener {
            void onLayoutChanged();
        }
    
        public void setOnLayoutChangedListener(OnLayoutChangedListener listener) {
            mOnLayoutChangedListener = listener;
        }
    
        private void layoutChanged() {
            if (mOnLayoutChangedListener != null) {
                mOnLayoutChangedListener.onLayoutChanged();
            }
        }
    
        public void showSubjectLine() {
            mSubjectView.setVisibility(VISIBLE);
        }
    
        public void setOnCryptoClickListener(OnCryptoClickListener onCryptoClickListener) {
            this.onCryptoClickListener = onCryptoClickListener;
        }
    }
    
    

    然后下面直接是这样一个可重用控件的布局

    <?xml version="1.0" encoding="utf-8"?>
    <com.fsck.k9.view.MessageHeader
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/header_container"
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="wrap_content">
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >
    
            <!-- Color chip -->
            <View
                android:id="@+id/chip"
                android:layout_width="8dip"
                android:layout_height="match_parent" />
    
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
    
                <TextView
                    android:id="@+id/subject"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:ellipsize="end"
                    android:textStyle="bold"
                    android:textColor="?android:attr/textColorPrimary"
                    android:textAppearance="?android:attr/textAppearanceMedium"
                    android:padding="8dp"
                    android:visibility="gone"
                    tools:visibility="visible"
                    tools:text="(no subject)"
                    />
    
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal" >
    
    
                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:orientation="vertical" >
    
                        <com.fsck.k9.ui.ContactBadge
                            android:id="@+id/contact_badge"
                            android:layout_width="40dp"
                            android:layout_height="40dp"
                            android:layout_marginTop="8dp"
                            android:layout_marginLeft="8dp" />
    
                        <!-- State icons -->
                        <LinearLayout
                            android:id="@+id/icon_container"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginTop="10dip"
                            android:layout_marginBottom="2dip"
                            android:layout_below="@+id/contact_badge"
                            android:layout_centerHorizontal="true"
                            android:orientation="vertical" >
    
                            <View
                                android:id="@+id/answered"
                                android:layout_width="32sp"
                                android:layout_height="32sp"
                                android:paddingRight="2dip"
                                android:background="@drawable/ic_email_answered_small" />
    
                            <View
                                android:id="@+id/forwarded"
                                android:layout_width="22sp"
                                android:layout_height="22sp"
                                android:paddingRight="4dip"
                                android:background="@drawable/ic_email_forwarded_small" />
    
                        </LinearLayout>
    
                    </RelativeLayout>
    
                    <RelativeLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:padding="6dip"
                        android:layout_marginLeft="2dp" >
    
                        <!-- From -->
                        <TextView
                            android:id="@+id/from"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_alignParentTop="true"
                            android:layout_alignParentLeft="true"
                            android:layout_toLeftOf="@+id/status_icon_strip"
                            android:layout_alignBottom="@+id/status_icon_strip"
                            android:paddingTop="0dp"
                            android:paddingRight="6dip"
                            android:singleLine="true"
                            android:ellipsize="end"
                            android:textColor="?android:attr/textColorPrimary"
                            android:textAppearance="?android:attr/textAppearanceMedium"
                            android:textStyle="bold"
                            android:text="@string/general_no_sender"
                            android:gravity="center_vertical"
                            />
    
                        <!-- Sender -->
                        <TextView
                            android:id="@+id/sender"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_alignParentLeft="true"
                            android:layout_toLeftOf="@+id/status_icon_strip"
                            android:paddingTop="0dp"
                            android:layout_below="@+id/from"
                            android:ellipsize="end"
                            android:textColor="?android:attr/textColorPrimary"
                            android:textAppearance="?android:attr/textAppearanceSmall"
                            android:textStyle="bold"
                            android:visibility="gone"
                            android:gravity="center_vertical"
                            />
                        
                        <!-- To -->
                        <TextView
                            android:id="@+id/to_label"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_alignLeft="@+id/from"
                            android:layout_alignBaseline="@+id/to"
                            android:paddingTop="2dp"
                            android:paddingRight="4dp"
                            android:text="@string/message_to_label"
                            android:textColor="?android:attr/textColorPrimary"
                            android:textAppearance="@android:style/TextAppearance.Medium"
                            android:textStyle="bold" />
    
                        <TextView
                            android:id="@+id/to"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_toRightOf="@+id/to_label"
                            android:layout_below="@+id/sender"
                            android:maxLines="2"
                            android:ellipsize="end"
                            android:paddingTop="2dp"
                            android:textColor="?android:attr/textColorSecondary"
                            android:textAppearance="@android:style/TextAppearance.Medium" />
                        
                        <!-- CC -->
                        <TextView
                            android:id="@+id/cc_label"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_below="@+id/to_label"
                            android:layout_alignLeft="@+id/to_label"
                            android:layout_alignBaseline="@+id/cc"
                            android:paddingTop="2dp"
                            android:paddingRight="4dp"
                            android:text="@string/message_view_cc_label"
                            android:textColor="?android:attr/textColorPrimary"
                            android:textStyle="bold"
                            android:textAppearance="@android:style/TextAppearance.Medium" />
                        
                        <TextView
                            android:id="@+id/cc"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_toRightOf="@+id/cc_label"
                            android:layout_below="@+id/to"
                            android:maxLines="2"
                            android:ellipsize="end"
                            android:paddingTop="2dp"
                            android:textColor="?android:attr/textColorSecondary"
                            android:textAppearance="@android:style/TextAppearance.Medium" />
    
                        <!-- BCC -->
                        <TextView
                            android:id="@+id/bcc_label"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_below="@+id/cc_label"
                            android:layout_alignLeft="@+id/cc_label"
                            android:layout_alignBaseline="@+id/bcc"
                            android:paddingTop="2dp"
                            android:paddingRight="4dp"
                            android:text="@string/message_view_bcc_label"
                            android:textColor="?android:attr/textColorPrimary"
                            android:textStyle="bold"
                            android:textAppearance="@android:style/TextAppearance.Medium" />
    
                        <TextView
                            android:id="@+id/bcc"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_toRightOf="@+id/bcc_label"
                            android:layout_below="@+id/cc"
                            android:maxLines="2"
                            android:ellipsize="end"
                            android:paddingTop="2dp"
                            android:textColor="?android:attr/textColorSecondary"
                            android:textAppearance="@android:style/TextAppearance.Medium" />
                        
                        <!-- Date -->
                        <TextView
                            android:id="@+id/date"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_below="@id/cc"
                            android:layout_alignParentRight="true"
                            android:paddingTop="8dp"
                            android:singleLine="true"
                            android:ellipsize="none"
                            android:textAppearance="?android:attr/textAppearanceSmall"
                            android:textColor="?android:attr/textColorSecondary" />
    
                        <LinearLayout
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_alignParentTop="true"
                            android:layout_alignParentRight="true"
                            android:layout_alignParentEnd="true"
                            android:layout_centerVertical="true"
                            android:id="@+id/status_icon_strip"
                            >
    
                            <CheckBox
                                android:id="@+id/flagged"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:focusable="false"
                                style="?android:attr/starStyle"
                                android:checked="false" />
    
                            <include layout="@layout/message_crypto_status_view" />
    
                        </LinearLayout>
    
                    </RelativeLayout>
    
                </LinearLayout>
    
                <TextView
                    android:id="@+id/additional_headers_view"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_margin="8dp"
                    android:layout_marginRight="6dip"
                    android:singleLine="false"
                    android:ellipsize="none"
                    android:textColor="?android:attr/textColorSecondary"
                    android:textAppearance="?android:attr/textAppearanceSmall"
                    android:textIsSelectable="true" />
    
            </LinearLayout>
    
        </LinearLayout>
    
        <View
            android:layout_height="1dip"
            android:layout_width="match_parent"
            android:layout_marginBottom="4dip"
            android:background="@drawable/divider_horizontal_email" />
    
    </com.fsck.k9.view.MessageHeader>
    
    

    其中的技巧是,在onFinishInflate中去初始化子view。这种写自定义可重用的view的方式比较灵活。

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          本文标题:有人采用这样一种方式封装可重用的自定义view

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