启动时打开其他活动

您可以使用以下方法检查应用程序是否处于首次运行状态： SharedPreferences

public class MainActivity extends Activity {

SharedPreferences prefs = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //Make SharedPreferences singleton
    prefs = getSharedPreferences("com.abc.appname", MODE_PRIVATE);
}

@Override
protected void onResume() {
    super.onResume();

    if (prefs.getBoolean("hasAlreadyRun", false)) {
        // Work first run stuff here then set 'firstrun' as false...
        //Run Activity A
        prefs.edit().putBoolean("hasAlreadyRun", true).commit();
    } else{
        //Run Activity B
    }
}
}