Android仿IOS自定义AlertDialog

本文介绍的仿IOS对话框的实现，先来看一下效果图

Paste_Image.png

具体代码如下：

public class AlertDialog {
    private Context context;
    private Dialog dialog;
    private LinearLayout lLayout_bg;
    private TextView txt_title;
    private TextView txt_msg;
    private Button btn_neg;
    private Button btn_pos;
    private ImageView img_line;
    private Display display;
    private boolean showTitle = false;
    private boolean showMsg = false;
    private boolean showPosBtn = false;
    private boolean showNegBtn = false;

    public AlertDialog(Context context) {
        this.context = context;
        WindowManager windowManager = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        display = windowManager.getDefaultDisplay();
    }

    public AlertDialog builder() {
        View view = LayoutInflater.from(context).inflate(
                R.layout.view_alertdialog, null);

        lLayout_bg = (LinearLayout) view.findViewById(R.id.lLayout_bg);
        txt_title = (TextView) view.findViewById(R.id.txt_title);
        txt_title.setVisibility(View.GONE);
        txt_msg = (TextView) view.findViewById(R.id.txt_msg);
        txt_msg.setVisibility(View.GONE);
        btn_neg = (Button) view.findViewById(R.id.btn_neg);
        btn_neg.setVisibility(View.GONE);
        btn_pos = (Button) view.findViewById(R.id.btn_pos);
        btn_pos.setVisibility(View.GONE);
        img_line = (ImageView) view.findViewById(R.id.img_line);
        img_line.setVisibility(View.GONE);

        dialog = new Dialog(context, R.style.AlertDialogStyle);
        dialog.setContentView(view);

        lLayout_bg.setLayoutParams(new FrameLayout.LayoutParams((int) (display
                .getWidth() * 0.80), LayoutParams.WRAP_CONTENT));

        return this;
    }

    public AlertDialog setTitle(String title) {
        showTitle = true;
        if ("".equals(title)) {
            txt_title.setText("标题");
        } else {
            txt_title.setText(title);
        }
        return this;
    }

    public AlertDialog setMsg(String msg) {
        showMsg = true;
        if ("".equals(msg)) {
            txt_msg.setText("内容");
        } else {
            txt_msg.setText(msg);
        }
        return this;
    }

    public AlertDialog setCancelable(boolean cancel) {
        dialog.setCancelable(cancel);
        return this;
    }

    public AlertDialog setPositiveButton(String text,
            final OnClickListener listener) {
        showPosBtn = true;
        if ("".equals(text)) {
            btn_pos.setText("确定");
        } else {
            btn_pos.setText(text);
        }
        btn_pos.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                listener.onClick(v);
                dialog.dismiss();
            }
        });
        return this;
    }

    public AlertDialog setNegativeButton(String text,
            final OnClickListener listener) {
        showNegBtn = true;
        if ("".equals(text)) {
            btn_neg.setText("取消");
        } else {
            btn_neg.setText(text);
        }
        btn_neg.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                listener.onClick(v);
                dialog.dismiss();
            }
        });
        return this;
    }

    private void setLayout() {
        if (!showTitle && !showMsg) {
            txt_title.setText("提示");
            txt_title.setVisibility(View.VISIBLE);
        }

        if (showTitle) {
            txt_title.setVisibility(View.VISIBLE);
        }

        if (showMsg) {
            txt_msg.setVisibility(View.VISIBLE);
        }

        if (!showPosBtn && !showNegBtn) {
            btn_pos.setText("确定");
            btn_pos.setVisibility(View.VISIBLE);
//          btn_pos.setBackgroundResource(R.drawable.alertdialog_single_selector);
            btn_pos.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });
        }

        if (showPosBtn && showNegBtn) {
            btn_pos.setVisibility(View.VISIBLE);
//          btn_pos.setBackgroundResource(R.drawable.alertdialog_right_selector);
            btn_neg.setVisibility(View.VISIBLE);
//          btn_neg.setBackgroundResource(R.drawable.alertdialog_left_selector);
            img_line.setVisibility(View.VISIBLE);
        }

        if (showPosBtn && !showNegBtn) {
            btn_pos.setVisibility(View.VISIBLE);
//          btn_pos.setBackgroundResource(R.drawable.alertdialog_single_selector);
        }

        if (!showPosBtn && showNegBtn) {
            btn_neg.setVisibility(View.VISIBLE);
//          btn_neg.setBackgroundResource(R.drawable.alertdialog_single_selector);
        }
    }

    public void show() {
        setLayout();
        dialog.show();
    }
}

布局文件view_alertdialog.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/lLayout_bg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/alert_bg"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/txt_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:layout_marginTop="15dp"
        android:gravity="center"
        android:textColor="@color/black"
        android:textSize="18sp"
        android:text="提示"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/txt_msg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:layout_marginTop="32dp"
        android:gravity="center"
        android:text="提示信息"
        android:textColor="@color/black"
        android:textSize="16sp" />

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="0.5dp"
        android:layout_marginTop="25dp"
        android:background="@color/alertdialog_line" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/btn_neg"
            android:layout_width="wrap_content"
            android:layout_height="43dp"
            android:layout_weight="1"
            android:background="@drawable/alertdialog_left_selector"
            android:gravity="center"
            android:textColor="@color/actionsheet_blue"
            android:textSize="16sp" 
            />

        <ImageView
            android:id="@+id/img_line"
            android:layout_width="0.5dp"
            android:layout_height="43dp"
            android:background="@color/alertdialog_line" />

        <Button
            android:id="@+id/btn_pos"
            android:layout_width="wrap_content"
            android:layout_height="43dp"
            android:layout_weight="1"
            android:background="@drawable/alertdialog_right_selector"
            android:gravity="center"
            android:textColor="@color/actionsheet_blue"
            android:textSize="16sp"
            android:textStyle="bold"
            />
    </LinearLayout>

</LinearLayout>

alertdialog_left_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/alert_btn_left_pressed" android:state_pressed="true"/>
    <item android:drawable="@drawable/trans_bg"/>

</selector>

alertdialog_right_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/alert_btn_right_pressed" android:state_pressed="true"/>
    <item android:drawable="@drawable/trans_bg"/>

</selector>

alertdialog_single_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/alert_btn_single_pressed" android:state_pressed="true"/>
    <item android:drawable="@drawable/trans_bg"/>

</selector>

<style name="AlertDialogStyle" parent="@android:style/Theme.Dialog">
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowFrame">@null</item>
        <item name="android:backgroundDimEnabled">true</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowIsTranslucent">true</item>
    </style>

用到的图片

alert_btn_right_pressed.9.png
alert_btn_left_pressed.9.png alert_bg.9.png alert_btn_single_pressed.9.png trans_bg.png

调用方式：
        new AlertDialog(this).builder().setMsg(msg)
        .setPositiveButton("确定", new OnClickListener() {
            @Override
            public void onClick(View v) {
                
            }
        }).setNegativeButton("取消", new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
            }
        }).show();
    

colors.xml文件
<color name="alertdialog_line">#c6c6c6</color>
<color name="actionsheet_blue">#037BFF</color>
<color name="black">#000000</color>