Button点击事件的几种实现方式

Demo链接：🚀05_ClickEvents (opens new window)

# 方式一：XML属性的onClick

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.vip.veblonwang.myapplication.MainActivity">

    <Button
        android:id="@+id/btnDoSomething"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="share"
        android:onClick="doSomething"/><!-- 这句是关键，点击时执行MainActivity中的doSomething方法 -->
</LinearLayout>

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MainActivity .java

public class MainActivity extends Activity{

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

    //方法必须定义为public
    public void doSomething(View view) { 
        // TODO
    }
}

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# 方式二：匿名内部类

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.btn_todo);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO
            }
        });
    }
}

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# 方式三：该页面类实现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.btn_todo);
        btn.setOnClickListener(this);
    }

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

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# 方式四：成员内部类

public class MainActivity extends Activity {
   private Button btn_todo;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mbtn_fifth = findViewById(R.id.btn_todo);

        //findViewById(R.id.btn_third).setOnClickListener(new InnerOnClickListener());

        InnerOnClickListener onClickListener = new InnerOnClickListener();
        findViewById(R.id.btn_third).setOnClickListener(onClickListener);
    }

    // 内部类
    private class InnerOnClickListener implements View.OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO
        }
    }
}

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或者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 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);
    }

    private class ClickListener implements View.OnClickListener{

        @Override
        public void onClick(View v) {
            // TODO
        }
    }
}

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# 方式五：OnClickListener接口作为属性

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);

        btn = (Button) findViewById(R.id.btn_todo);
        btn.setOnClickListener(clickListener);
        clickListener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO
            }
        };
    }
}

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编辑

#activity

上次更新: 2022/03/27, 22:58:50

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