Intent在Android中的幾種用法

如果是從BroadcastReceiver 啟動一個新的Activity , 不要忘記i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
 

public class MyReceiver extends BroadcastReceiver{

public static final String action="acc";
 public void onReceive(Context context, Intent intent) {
  Intent i=new Intent(context,Receivered.class);
  i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  context.startActivity(i);
 }

}

1. 指定act ion 和type 
// SIM import
        Intent importIntent = new Intent(Intent.ACTION_VIEW);
        importIntent.setType("vnd.android.cursor.item/sim-contact");
        importIntent.setClassName("com.android.phone", "com.android.phone.SimContacts");
        menu.add(0, 0, 0, R.string.importFromSim)
                .setIcon(R.drawable.ic_menu_import_contact)
                .setIntent(importIntent);
                
2. 指定act ion, da ta和type 
(1)隱式查找type
示例代碼：
uri: content://simcontacts/simPeople/(id)
intent = new Intent("android.intent.action.SIMEDIT",uri);
            startActivity(intent);

程序會很據data中的uri去查找匹配的type（必須的）            
provider中的getType()            
case SIM_PEOPLE_ID:
            return "vnd.android.cursor.item/sim-contact"; 

配置文件中的filter設定           
androidManifest.XML
    <intent-filter>
                <action android:name="android.intent.action.SIMEDIT" />
                <category android:name="android.intent.category.DEFAULT" />          
                <data android:mimeType="vnd.android.cursor.item/sim-contact" />
      </intent-filter>

也可以自己設定type，但只能使用 setDataAndType()     
      
3. 其他設定intent的屬性方式 
   Intent setComponent(ComponentName component) 
   Intent setClassName(Context packageContext, String className)
   Intent setClassName(String packageName, String className)
   Intent setClass(Context packageContext, Class<?> cls)
  

Intent 應該算是Android中特有的東西。你可以在Intent中指定程序 要執行的動作（比如：vIEw,edit,dial），以及程序執行到該動作時所需要的資料 。都指定好後，只要調用startActivity()，android系統 會自動尋找最符合你指定要求的應用 程序，並執行該程序。

下面列出幾種Intent 的用法
顯示網頁:

Uri uri = Uri.parse("http://www.google.com"); 
Intent it  = new Intent(Intent.ACTION_VIEW,uri); 
startActivity(it); 
顯示地圖:

Uri uri = Uri.parse("geo:38.899533,-77.036476"); 
Intent it = new Intent(Intent.Action_VIEW,uri); 
startActivity(it); 
路徑規劃:

Uri uri = Uri.parse("http://maps.google.com/maps?f=dsaddr=startLat%20startLng&daddr=endLat%20endLng&hl=en"); 
Intent it = new Intent(Intent.ACTION_VIEW,URI); 
startActivity(it); 
撥打電話:
調用撥號程序

Uri uri = Uri.parse("tel:xxxxxx"); 
Intent it = new Intent(Intent.ACTION_DIAL, uri);   
startActivity(it);   
Uri uri = Uri.parse("tel.xxxxxx"); 
Intent it =new Intent(Intent.ACTION_CALL,uri); 
要使用這個必須在配置文件 中加入<uses-permission id="android .permission.CALL_PHONE" /> 
發送SMS/MMS
調用發送短信 的程序

Intent it = new Intent(Intent.ACTION_VIEW);    
it.putExtra("sms_body", "The SMS text");    
it.setType("vnd.android-dir/mms-sms");    
startActivity(it);   
發送短信

Uri uri = Uri.parse("smsto:0800000123");    
Intent it = new Intent(Intent.ACTION_SENDTO, uri);    
it.putExtra("sms_body", "The SMS text");    
startActivity(it);   
發送彩信

Uri uri = Uri.parse("content://media/external/images/media/23");    
Intent it = new Intent(Intent.ACTION_SEND);    
it.putExtra("sms_body", "some text");    
it.putExtra(Intent.EXTRA_STREAM, uri);    
it.setType("image/png");    
startActivity(it); 
發送Email

Uri uri = Uri.parse("mailto:[email protected]"); 
Intent it = new Intent(Intent.ACTION_SENDTO, uri); 
startActivity(it); 
Intent it = new Intent(Intent.ACTION_SEND);    
it.putExtra(Intent.EXTRA_EMAIL, "[email protected]");    
it.putExtra(Intent.EXTRA_TEXT, "The email body text");    
it.setType("text/plain");    
startActivity(Intent.createChooser(it, "Choose Email ClIEnt"));   
Intent it=new Intent(Intent.ACTION_SEND);      
String[] tos={"[email protected]"};      
String[] ccs={"[email protected]"};      
it.putExtra(Intent.EXTRA_EMAIL, tos);      
it.putExtra(Intent.EXTRA_CC, ccs);      
it.putExtra(Intent.EXTRA_TEXT, "The email body text");      
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");      
it.setType("message/rfc822");      
startActivity(Intent.createChooser(it, "Choose Email ClIEnt"));    
添加附件

Intent it = new Intent(Intent.ACTION_SEND);    
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");    
it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3");    
sendIntent.setType("audio/mp3");    
startActivity(Intent.createChooser(it, "Choose Email ClIEnt")); 
播放 多媒體

   
Intent it = new Intent(Intent.ACTION_VIEW); 
Uri uri = Uri.parse("file:///sdcard/song.mp3"); 
it.setDataAndType(uri, "audio/mp3"); 
startActivity(it); 
Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");    
Intent it = new Intent(Intent.ACTION_VIEW, uri);    
startActivity(it);   
Uninstall 程序

Uri uri = Uri.fromParts("package", strPackageName, null);    
Intent it = new Intent(Intent.ACTION_DELETE, uri);    
startActivity(it);

uninstall apk 
Uri uninstallUri = Uri.fromParts("package", "xxx", null);

returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri); 
install apk 
Uri installUri = Uri.fromParts("package", "xxx", null);

returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri); 
play audio 
Uri playUri = Uri.parse("file:///sdcard/download/everything.mp3");

returnIt = new Intent(Intent.ACTION_VIEW, playUri); 
//發送附件 
Intent it = new Intent(Intent.ACTION_SEND);   
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");   
it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");   
sendIntent.setType("audio/mp3");   
startActivity(Intent.createChooser(it, "Choose Email ClIEnt")); 
//搜索應用 
Uri uri = Uri.parse("market://search?q=pname:pkg_name");   
Intent it = new Intent(Intent.ACTION_VIEW, uri);   
startActivity(it);   
//where pkg_name is the full package path for an application  

//顯示指定應用的詳細頁面（這個好像不支持了，找不到app_id） 
Uri uri = Uri.parse("market://details?id=app_id");   
Intent it = new Intent(Intent.ACTION_VIEW, uri);   
startActivity(it);   
//where app_id is the application ID, find the ID   
//by clicking on your application on Market home   
//page, and notice the ID from the address bar