Intent用法实例 1.无参数Activity跳转 Java代码  
Intent it = new Intent(Activity.Main.this, Activity2.class);  
startActivity(it);   2.向下一个Activity传递数据（使用Bundle和Intent.putExtras） Java代码  
Intent it = new Intent(Activity.Main.this, Activity2.class);  
Bundle bundle=new Bundle();  
bundle.putString("name", "This is from MainActivity!");  
it.putExtras(bundle);       // it.putExtra(“test”, "shuju”);  
startActivity(it);            // startActivityForResult(it,REQUEST_CODE);  对于数据的获取可以采用： Java代码  
Bundle bundle=getIntent().getExtras();  
String name=bundle.getString("name");  3.向上一个Activity返回结果（使用setResult，针对startActivityForResult(it,REQUEST_CODE)启动的Activity） 
Java代码  
Intent intent=getIntent();  Bundle bundle2=new Bundle();  bundle2.putString("name", "This is from ShowMsg!");  intent.putExtras(bundle2);  setResult(RESULT_OK, intent);  4.回调上一个Activity的结果处理函数（onActivityResult） 
Java代码  
@Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {  // TODO Auto-generated method stub  super.onActivityResult(requestCode, resultCode, data);  if (requestCode==REQUEST_CODE){  if(resultCode==RESULT_CANCELED)  setTitle("cancle");  else if (resultCode==RESULT_OK) {  String temp=null;  Bundle bundle=data.getExtras();  if(bundle!=null)   temp=bundle.getString("name");  setTitle(temp);  }  }  }  下面是转载来的其他的一些Intent用法实例（转自javaeye） 显示网页 
Java代码  
1. Uri uri = Uri.parse("http://google.com");    2. Intent it = new Intent(Intent.ACTION_VIEW, uri);    3. startActivity(it);   显示地图 
Java代码  
1. Uri uri = Uri.parse("geo:38.899533,-77.036476");    2. Intent it = new Intent(Intent.ACTION_VIEW, uri);     3. startActivity(it);     4. //其他 geo URI 範例    5. //geo:latitude,longitude    6. //geo:latitude,longitude?z=zoom    7. //geo:0,0?q=my+street+address    8. //geo:0,0?q=business+near+city    9. //google.streetview:cbll=lat,lng&cbp=1,yaw,,pitch,zoom&mz=mapZoom   路径规划 
Java代码  
1. Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");    2. Intent it = new Intent(Intent.ACTION_VIEW, uri);    3. startActivity(it);    4. //where startLat, startLng, endLat, endLng are a long with 6 decimals like: 50.123456    打电话 
Java代码  
1. //叫出拨号程序   2. Uri uri = Uri.parse("tel:0800000123");    3. Intent it = new Intent(Intent.ACTION_DIAL, uri);    4. startActivity(it);    1. //直接打电话出去    2. Uri uri = Uri.parse("tel:0800000123");    3. Intent it = new Intent(Intent.ACTION_CALL, uri);    4. startActivity(it);    5. //用這個，要在 AndroidManifest.xml 中，加上    6. //<uses-permission id="android.permission.CALL_PHONE" />    传送SMS/MMS 
Java代码  
1. //调用短信程序   2. Intent it = new Intent(Intent.ACTION_VIEW, uri);    3. it.putExtra("sms_body", "The SMS text");     4. it.setType("vnd.android-dir/mms-sms");    5. startActivity(it);   1. //传送消息   2. Uri uri = Uri.parse("smsto://0800000123");    3. Intent it = new Intent(Intent.ACTION_SENDTO, uri);    4. it.putExtra("sms_body", "The SMS text");    5. startActivity(it);   1. //传送 MMS    2. Uri uri = Uri.parse("content://media/external/images/media/23");    3. Intent it = new Intent(Intent.ACTION_SEND);     4. it.putExtra("sms_body", "some text");     5. it.putExtra(Intent.EXTRA_STREAM, uri);    6. it.setType("image/png");     7. startActivity(it);    传送 Email 
Java代码  
1. Uri uri = Uri.parse("mailto:xxx@abc.com");    2. Intent it = new Intent(Intent.ACTION_SENDTO, uri);    3. 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"));  传送附件 Java代码  
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"));   播放多媒体 
Java代码  
Uri uri = Uri.parse("file:///sdcard/song.mp3");    Intent it = new Intent(Intent.ACTION_VIEW, uri);    it.setType("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);   Market 相关 //寻找某个应用 
Java代码  
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 
Java代码  
显示某个应用的相关信息   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   发起一个应用程序 
ComponentName 两个参数一个是包名 一个是包下的主类 
Java代码  
final Intent intent = new Intent(Intent.ACTION_MAIN, null);  
intent.addCategory(Intent.CATEGORY_LAUNCHER);  
final ComponentName cn = new ComponentName("com.android.settings","com.android.settings.fuelgauge.PowerUsageSummary");  
intent.setComponent(cn);  
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
startActivity( intent);  Uninstall 应用程序 
Java代码  
Uri uri = Uri.fromParts("package", strPackageName, null);   Intent it = new Intent(Intent.ACTION_DELETE, uri);     startActivity(it);    返回桌面 
Java代码  
Intent unMyIntent = new Intent(Intent.ACTION_MAIN);  unMyIntent.addCategory(Intent.CATEGORY_HOME);  startActivity(unMyIntent);  发邮件 
Java代码  
Uri uri = Uri.parse("mailto:fengsheng.studio@hotmail.com");           
Intent it = new Intent(Intent.ACTION_SENDTO, uri);  发送文件 
Java代码  
Intent intent = new Intent();  
intent.setAction(Intent.ACTION_SEND);  
intent.setType(mimeType);  
intent.putExtra(Intent.EXTRA_STREAM, uri);  startActivity(intent);  以上有两个变量需要说明:  
1. mimeType: 如果是图片,则为"image/*",如果是音频,则为"audio/*",如果是视频,则为"video/*"  
2. uri:如果是直接读取到文件路径并发送,则为Uri.fromFile(new File(filePath));  如果是从数据库中查循出来的uri,则直接传入即可.  发起市场程序 
Java代码  
Intent intent = new Intent(Intent.ACTION_VIEW,   Uri.parse("market://details?id=pname:org.rabold.android.puzzleblox"));  //Uri.parse("market://search?q=pname:org.rabold.android.puzzleblox"));  startActivity(intent);  调用系统裁剪图片 
Java代码  
Uri photoUri = Uri.fromFile(new File("/mnt/sdcard/ruhua.jpg"));  Log.i("path", photoUri.toString());  Intent intent = new Intent("com.android.camera.action.CROP");  intent.setDataAndType(photoUri, "image/*");  intent.putExtra("crop", "true");  intent.putExtra("aspectX", 1);  intent.putExtra("aspectY", 1);  intent.putExtra("outputX", 80);  intent.putExtra("outputY", 80);  intent.putExtra("output", photoUri);  intent.putExtra("outputFormat", "JPEG");  实现分享功能 
Java代码  
Intent mIntent = new Intent(Intent.ACTION_SEND);  
//根据分享的内容设置不同的mimeType          mIntent.setType("text/plain");  
mIntent.putExtra(Intent.EXTRA_TEXT, "下载地址?");  
mIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
startActivity(Intent.createChooser(mIntent, "分享"));  获取图片 
Java代码  
Intent intent = new Intent();  /* 设置为image */  intent.setType("image/*");  /* 使用Intent.ACTION_GET_CONTENT这个Action */  intent.setAction(Intent.ACTION_GET_CONTENT);  /* 取得图片后返回本画面 */  startActivityForResult(intent, 1);