public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle SavedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//获取PackageManager实例以查找全局包信息。 PackageManager pm=getPackageManager();Button btn_open_weixin=findViewById(R.id.btn_open_weixin);btn_open_weixin.setOnClickListener(v – {//获取打开包中主Activity的Intent，参数为包名Intentent=pm .getLaunchIntentForPackage(\’ com.tencent.mm\’);startActivity(intent);});按钮btn_open_qq=findViewById(R.id.btn_open_qq);btn_open_qq.setOnClickListener(v – {Intent Intent=pm.getLaunchIntentForPackage(\’ com.tencent) .mobileqq\’) ;startActivity(意图);});}}
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