启动QQ，微信

try {
    Intent a = getPackageManager().getLaunchIntentForPackage("com.tencent.mobileqq");
    startActivity(a);
}catch (Exception e){
    Toast.makeText(MainActivity.this,"打开失败",Toast.LENGTH_SHORT).show();;
}
Intent a = getPackageManager().getLaunchIntentForPackage("com.tencent.mm");
 startActivity(a);