android写回调函数的写法和调用

1，在类中写一个接口及set方法
//接口测试类
private class MyCallBackTest{

private MyCallBack mBack;

private void setMyCallBack(MyCallBack mBack){
this.mBack=mBack;
}

public interface MyCallBack{
public void myBack();
}
}

2，在程序中调用

public class TestActivity extends Activity implements View.OnClickListener,MyCallBackTest.MyCallBack{
private Button bt;
prtvate MyCallBack mCallBack;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
bt=(Button) findViewById(R.id.btTest);
bt.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
mCallBack.setMyCallBack(this);
}
}

@Override
public void myBack() {
Toast.makeTest(this,"调用了回调接口"，Toast.LENGTH_LONG).show();
}
}