通过包名启动一个activity

通过apk包名启动一个activity 完整api 接口：

  private void openApplication(Context context,String packageName) {
PackageInfo pi = null;
try {
   pi = context.getPackageManager().getPackageInfo(packageName, 0);
} catch (NameNotFoundException e) {
   pi = null;
   e.printStackTrace();
}
if (pi == null) {


} else {
   Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
   resolveIntent.setPackage(pi.packageName);
   PackageManager pManager = context.getPackageManager();
   List<ResolveInfo> apps = pManager.queryIntentActivities(resolveIntent, 0);


   ResolveInfo ri = apps.iterator().next();
   if (ri != null) {
packageName = ri.activityInfo.packageName;
String className = ri.activityInfo.name;


Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
ComponentName cn = new ComponentName(packageName, className);
intent.setComponent(cn);
context.startActivity(intent);
   }
}
    }