Android Fragment的使用 五 DalogFragment

我这回是大家介绍一个封装了Fragment的DialogFragment类，因为AlertDialog遇到屏幕旋转的情况就会发生异常，但是这个类没有这个问题，所以Google也是推荐大家使用DialogFragment制作对话框，而且它能够使用AlertDialog使其不会受到屏幕旋转的影响。
使用例子如下：

public class MainActivity extends Activity implements LoginInputListener{   @Override   protected void onCreate(Bundle savedInstanceState)   {      super.onCreate(savedInstanceState);      setContentView(R.layout.activity_main);   }   public void showEditDialog(View view)   {      EditNameDialogFragment editNameDialog = new EditNameDialogFragment();      editNameDialog.show(getFragmentManager(), "EditNameDialog");   }   public void showLoginDialog(View view)   {      LoginDialogFragment dialog = new LoginDialogFragment();      dialog.show(getFragmentManager(), "loginDialog");   }   @Override   public void onLoginInputComplete(String username, String password)   {      Toast.makeText(this, "帐号：" + username + ",  密码 :" + password,            Toast.LENGTH_SHORT).show();   }}

public class EditNameDialogFragment extends DialogFragment{   private Button ok;   private Button cancel;   @Override   public View onCreateView(LayoutInflater inflater, ViewGroup container,         Bundle savedInstanceState)   {      getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);      View view = inflater.inflate(R.layout.fragment_edit_name, container,            false);      view.findViewById(R.id.id_cancel_edit_name).setOnClickListener(new View.OnClickListener() {         @Override         public void onClick(View v) {            onDestroyView();         }      });      view.findViewById(R.id.id_sure_edit_name).setOnClickListener(new View.OnClickListener() {         @Override         public void onClick(View v) {            Toast.makeText(getActivity(),"ok",Toast.LENGTH_SHORT).show();            onDestroyView();         }      });      return view;   }}

public class LoginDialogFragment extends DialogFragment{   private EditText mUsername;   private EditText mPassword;   public interface LoginInputListener   {      void onLoginInputComplete(String username, String password);   }   @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.fragment_login_dialog, null);      mUsername = (EditText) view.findViewById(R.id.id_txt_username);      mPassword = (EditText) view.findViewById(R.id.id_txt_password);      // Inflate and set the layout for the dialog      // Pass null as the parent view because its going in the dialog layout      builder.setView(view)            // Add action buttons            .setPositiveButton("Sign in",                  new DialogInterface.OnClickListener()                  {                     @Override                     public void onClick(DialogInterface dialog, int id)                     {                        LoginInputListener listener = (LoginInputListener) getActivity();                        listener.onLoginInputComplete(mUsername                              .getText().toString(), mPassword                              .getText().toString());                     }                  }).setNegativeButton("Cancel", null);      return builder.create();   }}

activity_main

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="showLoginDialog"        android:text="DialogFragment" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="showEditDialog"        android:text="DialogFragment与AlertDialog" /></LinearLayout>

fragment_edit_name

<?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"/>    <Button        android:id="@+id/id_cancel_edit_name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/id_txt_your_name"        android:text="cancel"        android:layout_alignParentLeft="true"/></RelativeLayout>

fragment_login_dialog

<?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/title" />    <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>

下一次将一些Fragment里面的高级用法。
再见