Android意图：带菜单和子菜单的列表视图

Question

大家好。我想在单击特定项目时显示子菜单。例如，点击播放视频显示包含另外2个项目的子菜单：播放它和显示播放列表。

该子菜单是否可能显示为“下拉菜单”或“对话框”？

这是我的工作代码：

package com.examples.youtubeapidemo; 

import com.google.android.youtube.player.YouTubeIntents; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ListView; 
import android.widget.TextView; 

import com.examples.youtubeapidemo.adapter.DemoArrayAdapter; 
import com.examples.youtubeapidemo.adapter.DemoListViewItem; 

import java.util.ArrayList; 
import java.util.List; 

/** 
* A sample activity which shows how to use the {@link YouTubeIntents} static 
* methods to create Intents that navigate the user to Activities within the 
* main YouTube application. 
*/ 

public final class IntentsDemoActivity extends Activity implements 
     OnItemClickListener { 

    // This is the value of Intent.EXTRA_LOCAL_ONLY for API level 11 and above. 
    private static final String EXTRA_LOCAL_ONLY = "android.intent.extra.LOCAL_ONLY"; 
    private static final String VIDEO_ID = "-Uwjt32NvVA"; 
    private static final String PLAYLIST_ID = "PLF3DFB800F05F551A"; 
    private static final String USER_ID = "Google"; 
    private static final int SELECT_VIDEO_REQUEST = 1000; 

    private List<DemoListViewItem> intentItems; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.intents_demo); 

     intentItems = new ArrayList<DemoListViewItem>(); 
     intentItems.add(new IntentItem("Play Video", IntentType.PLAY_VIDEO)); 
     intentItems.add(new IntentItem("Open Playlist", 
       IntentType.OPEN_PLAYLIST)); 
     intentItems.add(new IntentItem("Play Playlist", 
       IntentType.PLAY_PLAYLIST)); 
     intentItems.add(new IntentItem("Open User", IntentType.OPEN_USER)); 
     intentItems.add(new IntentItem("Open Search Results", 
       IntentType.OPEN_SEARCH)); 
     intentItems 
       .add(new IntentItem("Upload Video", IntentType.UPLOAD_VIDEO)); 

     ListView listView = (ListView) findViewById(R.id.intent_list); 
     DemoArrayAdapter adapter = new DemoArrayAdapter(this, 
       R.layout.list_item, intentItems); 
     listView.setAdapter(adapter); 
     listView.setOnItemClickListener(this); 

     TextView youTubeVersionText = (TextView) findViewById(R.id.youtube_version_text); 
     String version = YouTubeIntents.getInstalledYouTubeVersionName(this); 
     if (version != null) { 
      String text = String.format(
        getString(R.string.youtube_currently_installed), version); 
      youTubeVersionText.setText(text); 
     } else { 
      youTubeVersionText 
        .setText(getString(R.string.youtube_not_installed)); 
     } 
    } 

    public boolean isIntentTypeEnabled(IntentType type) { 
     switch (type) { 
     case PLAY_VIDEO: 
      return YouTubeIntents.canResolvePlayVideoIntent(this); 
     case OPEN_PLAYLIST: 
      return YouTubeIntents.canResolveOpenPlaylistIntent(this); 
     case PLAY_PLAYLIST: 
      return YouTubeIntents.canResolvePlayPlaylistIntent(this); 
     case OPEN_SEARCH: 
      return YouTubeIntents.canResolveSearchIntent(this); 
     case OPEN_USER: 
      return YouTubeIntents.canResolveUserIntent(this); 
     case UPLOAD_VIDEO: 
      return YouTubeIntents.canResolveUploadIntent(this); 
     } 

     return false; 
    } 

    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, 
      long id) { 
     IntentItem clickedIntentItem = (IntentItem) intentItems.get(position); 

     Intent intent; 
     switch (clickedIntentItem.type) { 
     case PLAY_VIDEO: 
      intent = YouTubeIntents.createPlayVideoIntentWithOptions(this, 
        VIDEO_ID, true, false); 
      startActivity(intent); 
      break; 
     case OPEN_PLAYLIST: 
      intent = YouTubeIntents.createOpenPlaylistIntent(this, PLAYLIST_ID); 
      startActivity(intent); 
      break; 
     case PLAY_PLAYLIST: 
      intent = YouTubeIntents.createPlayPlaylistIntent(this, PLAYLIST_ID); 
      startActivity(intent); 
      break; 
     case OPEN_SEARCH: 
      intent = YouTubeIntents.createSearchIntent(this, USER_ID); 
      startActivity(intent); 
      break; 
     case OPEN_USER: 
      intent = YouTubeIntents.createUserIntent(this, USER_ID); 
      startActivity(intent); 
      break; 
     case UPLOAD_VIDEO: 
      // This will load a picker view in the users' gallery. 
      // The upload activity is started in the function onActivityResult. 
      intent = new Intent(Intent.ACTION_PICK, null).setType("video/*"); 
      intent.putExtra(EXTRA_LOCAL_ONLY, true); 
      startActivityForResult(intent, SELECT_VIDEO_REQUEST); 
      break; 
     } 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, 
      Intent returnedIntent) { 
     if (resultCode == RESULT_OK) { 
      switch (requestCode) { 
      case SELECT_VIDEO_REQUEST: 
       Intent intent = YouTubeIntents.createUploadIntent(this, 
         returnedIntent.getData()); 
       startActivity(intent); 
       break; 
      } 
     } 
     super.onActivityResult(requestCode, resultCode, returnedIntent); 
    } 

    private enum IntentType { 
     PLAY_VIDEO, OPEN_PLAYLIST, PLAY_PLAYLIST, OPEN_USER, OPEN_SEARCH, UPLOAD_VIDEO; 
    } 

    private final class IntentItem implements DemoListViewItem { 

     public final String title; 
     public final IntentType type; 

     public IntentItem(String title, IntentType type) { 
      this.title = title; 
      this.type = type; 
     } 

     @Override 
     public String getTitle() { 
      return title; 
     } 

     @Override 
     public boolean isEnabled() { 
      return isIntentTypeEnabled(type); 
     } 

     @Override 
     public String getDisabledText() { 
      return getString(R.string.intent_disabled); 
     } 
    } 
} 

Answer 1

您可以尝试实现它，如下面的代码：

public void showPopup(View v) { 
    final PopupMenu popup = new PopupMenu(this, v); 
    final MenuInflater inflater = popup.getMenuInflater(); 
    inflater.inflate(R.menu.actions, popup.getMenu()); 

    popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() { 
     @Override 
     public boolean onMenuItemClick(MenuItem item) { 
      switch (item.getItemId()) { 
       case R.id.play_video: 
        //intent = YouTubeIntents.createPlayVideoIntentWithOptions(this, 
        //  VIDEO_ID, true, false); 
        //startActivity(intent); 
        Toast.makeText(TestActivity.this, "play video", Toast.LENGTH_LONG).show(); 
        return true; 
       case R.id.show_playlist: 
        //intent = YouTubeIntents.createOpenPlaylistIntent(this, PLAYLIST_ID); 
        //startActivity(intent); 
        Toast.makeText(TestActivity.this, "show playlist", Toast.LENGTH_LONG).show(); 
        return true; 
       default: 
        return false; 
      } 
     } 
    }); 
    popup.show(); 
} 

与RES /菜单文件夹actions.xml：

<?xml version="1.0" encoding="utf-8"?> 

<menu xmlns:android="http://schemas.android.com/apk/res/android"> 
    <item android:id="@+id/play_video" 
      android:title="Play Video" 
      android:showAsAction="ifRoom"/> 
    <item android:id="@+id/show_playlist" 
      android:title="Show playlist" /> 
</menu> 

它实际上与the documentation中提到的方式类似