//内部类
private class InnerClass{
    public void doSomething(){
          setTestStaticValue("123");
          getTestStaticValue();
          setTestValue("test_value");
          getTestValue();
    }    
    private void doLog() {
            Log.d("un_use_log_tag","un_use_log_dolog");
     }
}

//成员变量和方法
private String testValue="fdksajfljklds";
private String getTestValue() {
    return testValue;
}
private void setTestValue(String testValue) {
    this.testValue = testValue;
}
//静态成员变量和方法
private static String testStaticValue="TestValue";
private static String getTestStaticValue() {
    return testStaticValue;
}
private static void setTestStaticValue(String value) {
    testStaticValue = value;
}

  private MainActCtrl ctrl = new MainActCtrl(this);
    @Override
    public void onResume() {
        super.onResume();
        ctrl.onResume();
    }
    @Override
    public void onStart() {
        super.onStart();
        ctrl.onStart();
    }
    @Override
    public void onPause() {
        super.onPause();
        ctrl.onPause();
    }

public void onResume() {
        Log.d("un_use_log_tag","un_use_log_onResume");
    }

    public void onStart() {
        Log.d("un_use_log_tag","un_use_log_onStart");
    }

    public void onPause() {
       Log.d("un_use_log_tag","un_use_log_onPuase");
    }

    fun onResume() {
        Log.d("un_use_log_tag","un_use_log_onResume");
    }

    fun onStart() {
        Log.d("un_use_log_tag","un_use_log_onStart");
    }

    fun onPause() {
        Log.d("un_use_log_tag","un_use_log_onPause");
    }

 <View
          android:layout_width="1dp"
         android:layout_height="1dp"
          android:visibility="gone"
                />