onClickListener的设置

1. 在控件里面声明
2. 通过查找id的方式找到控件，然后再设置点击事件
   此处可以有两种设置方式。

    <Button
        android:id="@+id/bt_test1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button1"
        tools:layout_editor_absoluteX="157dp"
        tools:layout_editor_absoluteY="99dp"
        tools:ignore="MissingConstraints" />

    <Button
        android:id="@+id/bt_test2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button2"
        tools:layout_editor_absoluteX="157dp"
        tools:layout_editor_absoluteY="195dp"
        tools:ignore="MissingConstraints" />

然后setOnClickListener

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button mbt_test1;
    private Button mbt_test2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();

        initClickListener();

    }

    private void initClickListener() {
        //方法一
        mbt_test1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                System.out.println("test1 be clicked!");
            }
        });
        //方法二
        mbt_test2.setOnClickListener(this);
    }

    //寻找资源控件
    private void initView() {
        mbt_test1=findViewById(R.id.bt_test1);
        mbt_test2=findViewById(R.id.bt_test2);
    }

    /**
     * Called when a view has been clicked.
     *
     * @param v The view that was clicked.
     */
    @Override
    public void onClick(View v) {
        int id=v.getId();
        switch (id){
            case   R.id.bt_test2:
                System.out.println("test2");
                break;
        }
    }
}

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