前言

使用DialogFragment来管理对话框，当旋转屏幕和按下后退键时可以更好的管理其声明周期，它和Fragment有着基本一致的声明周期。且DialogFragment也允许开发者把Dialog作为内嵌的组件进行重用。(结合大佬们的博客总结的，如有侵权，麻烦联系我删除此文章）

使用DialogFragment至少需要实现onCreateView或者onCreateDIalog方法。onCreateView即使用定义的xml布局文件展示Dialog。onCreateDialog即利用AlertDialog或者Dialog创建出Dialog。

用法

onCreateView的实现

继承DialogFragment

public class EditNameDialogFragment extends DialogFragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.fragment_setname, container);
        Button button = view.findViewById(R.id.id_sure_edit_name);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dismiss();
            }
        });
        return view;
    }

}

fragment_setname.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/id_label_your_name"
        android:layout_width="wrap_content"
        android:layout_height="32dp"
        android:gravity="center_vertical"
        android:text="Your name:" />

    <EditText
        android:id="@+id/id_txt_your_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/id_label_your_name"
        android:imeOptions="actionDone"
        android:inputType="text" />

    <Button
        android:id="@+id/id_sure_edit_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@id/id_txt_your_name"
        android:text="ok" />

</RelativeLayout>

调用

                    EditNameDialogFragment editNameDialog = new EditNameDialogFragment();
                    editNameDialog.show(getFragmentManager(), "EditNameDialog");

运行截图

1.jpg

onCreateDialog的实现

继承DialogFragment

public class LoginDialogFragment extends DialogFragment {

    private EditText t_username;
    private EditText t_password;

    public interface LoginListener {
        void login(String username,String psw);
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        // Get the layout inflater
        LayoutInflater inflater = getActivity().getLayoutInflater();
        View view = inflater.inflate(R.layout.dialog_login, null);
        t_username = view.findViewById(R.id.id_txt_username);
        t_password = view.findViewById(R.id.id_txt_password);
        builder.setView(view)
                // Add action buttons
                .setPositiveButton("Sign in",
                        new DialogInterface.OnClickListener()
                        {
                            @Override
                            public void onClick(DialogInterface dialog, int id)
                            {
                                ((LoginListener)getActivity()).login(t_username.getText().toString(),t_password.getText().toString());
                            }
                        }).setNegativeButton("Cancel", null);
        return builder.create();
    }

}

dialog_login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="64dp"
        android:background="#FFFFBB33"
        android:contentDescription="@string/app_name"
        android:scaleType="center"
        android:src="@drawable/ic_launcher_background" />

    <EditText
        android:id="@+id/id_txt_username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="4dp"
        android:layout_marginLeft="4dp"
        android:layout_marginRight="4dp"
        android:layout_marginTop="16dp"
        android:hint="input username"
        android:inputType="textEmailAddress" />

    <EditText
        android:id="@+id/id_txt_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:layout_marginLeft="4dp"
        android:layout_marginRight="4dp"
        android:layout_marginTop="4dp"
        android:fontFamily="sans-serif"
        android:hint="input password"
        android:inputType="textPassword" />

</LinearLayout>

调用及数据回传

    LoginDialogFragment dialog = new LoginDialogFragment();
    dialog.show(getFragmentManager(), "loginDialog");

     @Override
    public void login(String username, String psw) {
        LogUtil.log("Get Data : username = " + username + " , password = " + psw);
    }

运行截图:

9.png

2019-06-29 12:23:49.922 28355-28355/sayhallo.cn.ilikeandroid E/LOG_: Get Data : username = hhhh , password = hhhhh

附加说明

1、屏蔽返回键和外部点击

只需要在onCreate方法中加入

@Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setCancelable(false);
    }

2、去掉，弹窗的黑色棱角

在onViewCreated方法中加入

    getDialog().getWindow().setBackgroundDrawable(new BitmapDrawable());

3、设置软键盘监听，在DialogFragment中含有EditText时，点击EditText以外的部分，关闭软键盘

在onViewCreate（）方法中加入如下代码

/**
     * 点击非输入框区域时，自动收起键盘
     */
    private void initSoftInputListener() {
        getDialog().getWindow().getDecorView()
                   .setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent event) {
                InputMethodManager manager = (InputMethodManager)getActivity()
                              .getSystemService(Context.INPUT_METHOD_SERVICE);
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    if (getDialog().getCurrentFocus() != null 
                    && getDialog().getCurrentFocus().getWindowToken() != null) {
                          manager.hideSoftInputFromWindow(
                                  getDialog().getCurrentFocus().getWindowToken(), 
                                  InputMethodManager.HIDE_NOT_ALWAYS);
                    }
                }
                return false;
            }
        });
    }

在工作中，遇到了适配平板的问题，于是找了很多文章和资料去控制窗口的大小，终于找到一种方式可以控制，于是，我把它封装成了一个基类

public abstract class BaseFragmentDialog extends DialogFragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(initLayoutId(), container);
        ButterKnife.bind(this,view);
        initView();
        initListener();
        return view;
    }

    protected abstract void initListener();

    protected abstract void initView();

    /**
     * 设置窗体大小的方法
     */
    @Override
    public void onStart() {
        super.onStart();
        Window window = getDialog().getWindow();
        window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        WindowManager.LayoutParams windowParams = window.getAttributes();
        int height = windowParams.height;
        int width = windowParams.width;
//        windowParams.dimAmount = 0.0f;
//        windowParams.y = 100;
//        window.setAttributes(windowParams);
        Dialog dialog = getDialog();
        if (dialog != null) {
            DisplayMetrics dm = new DisplayMetrics();
            getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
            dialog.getWindow().setLayout(PxdUtils.Dp2Px(getContext(),getWidth()), height);
//            dialog.getWindow().setLayout((int) (dm.widthPixels * 0.6), (int) (dm.heightPixels * 0.5));
        }
    }

    protected float getWidth() {
        return 400.0f;
    }

    protected abstract int initLayoutId();
}

待我抽空研究下Dialog和它的窗口大小的控制方法