蜂巢(Honeycomb)的對話片段(DialogFragment)

來到 Android 3, 蜂巢(Honeycomb), 為支持應用程序中的多個活動間(multiple activities)的UI和邏輯重用, showDialog()和dismissDialog()方法被棄用, 取而代之的是對話片段(DialogFragment).

實現話片段(DialogFragment), 先創建它的佈局文件和擴展 DialogFragment 類.

實現話片段(DialogFragment)的佈局文件, /res/layout/dialogfragments.xml:

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

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="I'm Dialog Fragment" />
 <ImageView 
     android:layout_width="match_parent"
        android:layout_height="wrap_content"
     />
</LinearLayout>

創建擴展 DialogFragment 的類, MyDialogFragment.java.

package com.Android3DialogFragments;

import android.app.DialogFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class MyDialogFragment extends DialogFragment {
 
 public MyDialogFragment(){}
 
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  View myDialogFragmentView = inflater.inflate(R.layout.dialogfragments, container);
        getDialog().setTitle("MyDialogFragment");

        return myDialogFragmentView;
 }

}

修改主佈局main.xml, 添加一個按鈕打開對話片段.

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

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <Button
        android:id="@+id/opendialogfragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Open Dialog Fragment" />

</LinearLayout>

主活動的Java代碼

package com.Android3DialogFragments;

import android.app.Activity;
import android.app.FragmentManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Android3DialogFragmentsActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button openDialogFragment = (Button)findViewById(R.id.opendialogfragment);
        openDialogFragment.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    openMyDialogFragment();
   }});
    }
    
    private void openMyDialogFragment(){
     FragmentManager fragmentManager = getFragmentManager();
     MyDialogFragment myDialogFragment = new MyDialogFragment();
     myDialogFragment.show(fragmentManager, "tag_myDialogFragment");
    }

}