启动另一个app

1. Intent intent = new Intent(Intent.ACTION_MAIN);  
2. intent.addCategory(Intent.CATEGORY_LAUNCHER);              
3. ComponentName cn = new ComponentName(packageName, className);              
4. intent.setComponent(cn);  
5. startActivity(intent);  

1. private void doStartApplicationWithPackageName(String packagename) {  
2.   
3.     // 通过包名获取此APP详细信息，包括Activities、services、versioncode、name等等  
4.     PackageInfo packageinfo = null;  
5.     try {  
6.         packageinfo = getPackageManager().getPackageInfo(packagename, 0);  
7.     } catch (NameNotFoundException e) {  
8.         e.printStackTrace();  
9.     }  
10.     if (packageinfo == null) {  
11.         return;  
12.     }  
13.   
14.     // 创建一个类别为CATEGORY_LAUNCHER的该包名的Intent  
15.     Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);  
16.     resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);  
17.     resolveIntent.setPackage(packageinfo.packageName);  
18.   
19.     // 通过getPackageManager()的queryIntentActivities方法遍历  
20.     List<ResolveInfo> resolveinfoList = getPackageManager()  
21.             .queryIntentActivities(resolveIntent, 0);  
22.   
23.     ResolveInfo resolveinfo = resolveinfoList.iterator().next();  
24.     if (resolveinfo != null) {  
25.         // packagename = 参数packname  
26.         String packageName = resolveinfo.activityInfo.packageName;  
27.         // 这个就是我们要找的该APP的LAUNCHER的Activity[组织形式：packagename.mainActivityname]  
28.         String className = resolveinfo.activityInfo.name;  
29.         // LAUNCHER Intent  
30.         Intent intent = new Intent(Intent.ACTION_MAIN);  
31.         intent.addCategory(Intent.CATEGORY_LAUNCHER);  
32.   
33.         // 设置ComponentName参数1:packagename参数2:MainActivity路径  
34.         ComponentName cn = new ComponentName(packageName, className);  
35.   
36.         intent.setComponent(cn);  
37.         startActivity(intent);  
38.     }  
39. }   

（二）通过action

（三）传参数： http://www.aboutit.cn/post/195