新增ButtonClick != 教學

package com.blogspot.ljcucc.myfirstappforandroid;
import android.view.View;//*import android.widget.Button;//*
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {// "*" = 增加
    private Button btnDo;

    private Button.OnClickListener ListenClick =//*
            new Button.OnClickListener() {//*
                @Override
                public void onClick(View v) {
                    //執行內容
                }
            };
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnDo = (Button)findViewById(R.id.button);//*
    }
}