Android点击事件的几种实现方式

1. 在每次使用时新实现一个OnClickListener接口

public class MainActivity extends Activity {
    private Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.btnDoSomething);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                doSomething(v);
            }
        });
    }

    public void doSomething(View view) {
        /*do something here*/
    }
}

2. 让这个页面类实现OnClickListener接口

public class MainActivity extends Activity implements View.OnClickListener{
    private Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.btnDoSomething);
        btn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btnDoSomething:
                doSomething(v);
                break;
            default:
                break;
        }
    }

    public void doSomething(View view) {
        /*do something here*/
    }
}

3. 多组合少继承的原则，把OnClickListener接口作为一个属性放到页面类中

public class MainActivity extends Activity{
    private Button btn;
    private View.OnClickListener clickListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        clickListener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                doSomething(v);
            }
        };
        btn = (Button) findViewById(R.id.btnDoSomething);
        btn.setOnClickListener(clickListener);
    }

    public void doSomething(View view) {
        /*do something here*/
    }
}

4. 把类中的点击事件看作是一个对象，新建一个类来实现这些事件

public class ClickListener implements View.OnClickListener{

    @Override
    public void onClick(View v) {
        doSomething(v);
    }
    
    private void doSomething(View view) {
        /*do something here*/
    }
}

在使用的时候，新建或者组合使用

public class MainActivity extends Activity{
    private Button btn;
    private ClickListener clickListener =  new ClickListener();

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

        btn = (Button) findViewById(R.id.btnDoSomething);
        btn.setOnClickListener(clickListener);
    }
}

5. 在java类中定义好点击事件要执行的方法，在布局文件xml中调用
   activity_main.xml

MainActivity .java

public class MainActivity extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    
    public void doSomething(View view) { //方法必须定义为public
        /*do something here*/
    }
}

个人理解就上面几种实现方式了~
推荐使用第三、四种方式，其他方式不推荐