Android 開發之：Intent.createChooser() 妙用

Intent.createChooser(ntent target, CharSequence title)

其實 大家對該功能第一影響就是ApiDemo 裡面的 其只有區區幾行代碼  提取為：

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);   

1. intent.setType("audio/*");   
2. startActivity(Intent.createChooser(intent, "Select music"));  

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);intent.setType("audio/*");startActivity(Intent.createChooser(intent, "Select music"));

 

執行之 會彈出一個對話方塊 效果為：

其實 對於這段代碼 大家應該都能猜出什麼意思  現自己類比並理解之

[代碼]

1. 定義TestActivity 用於根據傳入Uri  播放目標

public class TestActivity extends Activity {   

1.        
2.     @Override  
3.     public void onCreate(Bundle savedInstanceState) {   
4.         super.onCreate(savedInstanceState);   
5.         setContentView(R.layout.main);   
6.         this.setTitle("TestActivity");   
7.            
8.         Intent i = this.getIntent();   
9.            
10.         Uri u = i.getData();   
11.            
12.         try {   
13.             playMusic(u);   
14.         } catch (IllegalArgumentException e) {   
15.             // TODO Auto-generated catch block   
16.             e.printStackTrace();   
17.         } catch (SecurityException e) {   
18.             // TODO Auto-generated catch block   
19.             e.printStackTrace();   
20.         } catch (IllegalStateException e) {   
21.             // TODO Auto-generated catch block   
22.             e.printStackTrace();   
23.         } catch (IOException e) {   
24.             // TODO Auto-generated catch block   
25.             e.printStackTrace();   
26.         }   
27.     }   
28.        
29.     public void playMusic(Uri uri) throws IllegalArgumentException, SecurityException, IllegalStateException, IOException{   
30.         MediaPlayer mp = new MediaPlayer();   
31.         mp.setDataSource(this, uri);   
32.         mp.prepare();   
33.         mp.start();   
34.     }   
35. }  

public class TestActivity extends Activity {@Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        this.setTitle("TestActivity");                Intent i = this.getIntent();                Uri u = i.getData();                try {        playMusic(u);} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public void playMusic(Uri uri) throws IllegalArgumentException,

 SecurityException, IllegalStateException, IOException{MediaPlayer mp = new MediaPlayer();mp.setDataSource(this, uri);mp.prepare();        mp.start();}}

2. 在AndroidManifest 註冊TestActivity

<activity<