Intent在Android中的几种用法 .

如果是从BroadcastReceiver 启动一个新的Activity , 不要忘记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)隐式查找type
示例代码：
uri: content://simcontacts/simPeople/(id)
intent = new Intent("android.intent.action.SIMEDIT",uri);
            startActivity(intent);

程序会很据data中的uri去查找匹配的type（必须的）            
provider中的getType()            
case SIM_PEOPLE_ID:
            return "vnd.android.cursor.item/sim-contact";  

配置文件中的filter设定           
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>

也可以自己设定type，但只能使用 setDataAndType()     
      
3. 其他设定intent的属性方式
   Intent setComponent(ComponentName component)
   Intent setClassName(Context packageContext, String className)
   Intent setClassName(String packageName, String className)
   Intent setClass(Context packageContext, Class<?> cls)
   

Intent 应该算是Android中特有的东西。你可以在Intent中指定程序 要执行的动作（比如：view,edit,dial），以及程序执行到该动作时所需要的资料 。都指定好后，只要调用startActivity()，Android系统 会自动寻找最符合你指定要求的应用 程序，并执行该程序。

下面列出几种Intent 的用法
显示网页:

1. Uri uri = Uri.parse("http://www.google.com");
2. Intent it  = new Intent(Intent.ACTION_VIEW,uri);
3. startActivity(it);

显示地图:

1. Uri uri = Uri.parse("geo:38.899533,-77.036476");
2. Intent it = new Intent(Intent.Action_VIEW,uri);
3. startActivity(it);

路径规划:

1. Uri uri = Uri.parse("http://maps.google.com/maps?f=dsaddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");
2. Intent it = new Intent(Intent.ACTION_VIEW,URI);
3. startActivity(it);

拨打电话:
调用拨号程序

1. Uri uri = Uri.parse("tel:xxxxxx");
2. Intent it = new Intent(Intent.ACTION_DIAL, uri);  
3. startActivity(it);  

1. Uri uri = Uri.parse("tel.xxxxxx");
2. Intent it =new Intent(Intent.ACTION_CALL,uri);
3. 要使用这个必须在配置文件 中加入<uses-permission id="android .permission.CALL_PHONE" />

发送SMS/MMS
调用发送短信 的程序

1. Intent it = new Intent(Intent.ACTION_VIEW);   
2. it.putExtra("sms_body", "The SMS text");   
3. it.setType("vnd.android-dir/mms-sms");   
4. startActivity(it);  

发送短信

1. Uri uri = Uri.parse("smsto:0800000123");   
2. Intent it = new Intent(Intent.ACTION_SENDTO, uri);   
3. it.putExtra("sms_body", "The SMS text");   
4. startActivity(it);  

发送彩信

1. Uri uri = Uri.parse("content://media/external/images/media/23");   
2. Intent it = new Intent(Intent.ACTION_SEND);   
3. it.putExtra("sms_body", "some text");   
4. it.putExtra(Intent.EXTRA_STREAM, uri);   
5. it.setType("image/png");   
6. startActivity(it);

发送Email

2. Uri uri = Uri.parse("mailto:xxx@abc.com");
3. Intent it = new Intent(Intent.ACTION_SENDTO, uri);
4. startActivity(it);

1. Intent it = new Intent(Intent.ACTION_SEND);   
2. it.putExtra(Intent.EXTRA_EMAIL, "me@abc.com");   
3. it.putExtra(Intent.EXTRA_TEXT, "The email body text");   
4. it.setType("text/plain");   
5. startActivity(Intent.createChooser(it, "Choose Email Client"));  

1. Intent it=new Intent(Intent.ACTION_SEND);     
2. String[] tos={"me@abc.com"};     
3. String[] ccs={"you@abc.com"};     
4. it.putExtra(Intent.EXTRA_EMAIL, tos);     
5. it.putExtra(Intent.EXTRA_CC, ccs);     
6. it.putExtra(Intent.EXTRA_TEXT, "The email body text");     
7. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");     
8. it.setType("message/rfc822");     
9. startActivity(Intent.createChooser(it, "Choose Email Client"));   

添加附件

1. Intent it = new Intent(Intent.ACTION_SEND);   
2. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");   
3. it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3");   
4. sendIntent.setType("audio/mp3");   
5. startActivity(Intent.createChooser(it, "Choose Email Client"));

播放 多媒体

1.   
2. Intent it = new Intent(Intent.ACTION_VIEW);
3. Uri uri = Uri.parse("file:///sdcard/song.mp3");
4. it.setDataAndType(uri, "audio/mp3");
5. startActivity(it);

1. Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");   
2. Intent it = new Intent(Intent.ACTION_VIEW, uri);   
3. startActivity(it);  

Uninstall 程序

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

uninstall apk

1. Uri uninstallUri = Uri.fromParts("package", "xxx", null);
3. returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);

install apk

1. Uri installUri = Uri.fromParts("package", "xxx", null);
3. returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);

play audio

1. Uri playUri = Uri.parse("file:///sdcard/download/everything.mp3");
3. returnIt = new Intent(Intent.ACTION_VIEW, playUri);

1. //发送附件
2. Intent it = new Intent(Intent.ACTION_SEND);  
3. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");  
4. it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");  
5. sendIntent.setType("audio/mp3");  
6. startActivity(Intent.createChooser(it, "Choose Email Client"));

1. //搜索应用
2. Uri uri = Uri.parse("market://search?q=pname:pkg_name");  
3. Intent it = new Intent(Intent.ACTION_VIEW, uri);  
4. startActivity(it);  
5. //where pkg_name is the full package path for an application  
7. //显示指定应用的详细页面（这个好像不支持了，找不到app_id）
8. Uri uri = Uri.parse("market://details?id=app_id");  
9. Intent it = new Intent(Intent.ACTION_VIEW, uri);  
10. startActivity(it);  
11. //where app_id is the application ID, find the ID  
12. //by clicking on your application on Market home  
13. //page, and notice the ID from the address bar