Harmony2.0开发—事件

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常见的事件有：单击、双击、长按、还有触摸事件 。
我们可以给文本、按钮等等组件添加不同的事件。

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更多详情可前往鄙人博客网站获取：https://roydon.xyz/
（不建议CSDN直接打开）

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单击事件

• 接口名：ClickedListener

四种实现方法(下面的其他事件类推)：

1. 自己编写实现类

public class MainAbilitySlice extends AbilitySlice {

    Button btn1;
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        btn1 = (Button) findComponentById(ResourceTable.Id_btn1);

        // 1.自定义实现类
        btn1.setClickedListener(new MyListener());

    }

    @Override
    public void onActive() {super.onActive();}

    @Override
    public void onForeground(Intent intent) {super.onForeground(intent);}
}

// 自定义实现类，里面重写点击方法
class MyListener implements Component.ClickedListener{
    @Override
    public void onClick(Component component) {
        Button btn1 = (Button) component;

        btn1.setText("被点了");

        btn1.setClickable(false);
    }
}

2. 实现 Component.ClickedListener 接口

public class MainAbilitySlice extends AbilitySlice implements Component.ClickedListener {

    Button btn1;
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        btn1 = (Button) findComponentById(ResourceTable.Id_btn1);

        // 2.实现接口
        btn1.setClickedListener(this);

    }

    // 重写点击方法
    @Override
    public void onClick(Component component) {
        btn1.setText("被点了");
    }
    @Override
    public void onActive() {super.onActive();}

    @Override
    public void onForeground(Intent intent) {super.onForeground(intent);}

}

3. 方法引用

public class MainAbilitySlice extends AbilitySlice implements Component.ClickedListener {

    Button btn1;
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        btn1 = (Button) findComponentById(ResourceTable.Id_btn1);

        // 3.方法引用
        btn1.setClickedListener(this::onClick);

    }

    @Override
    public void onClick(Component component) {
        btn1.setText("被点了");
    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}

4. 匿名内部类

public class MainAbilitySlice extends AbilitySlice{

    Button btn1;
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        btn1 = (Button) findComponentById(ResourceTable.Id_btn1);

        // 4.匿名内部类
        btn1.setClickedListener(new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                btn1.setText("被点了");
            }
        });

    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}

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双击事件

• 接口名：DoubleClickedListener

public class MainAbilitySlice extends AbilitySlice{

    Button btn1;
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        btn1 = (Button) findComponentById(ResourceTable.Id_btn1);

        // 绑定双击事件
        btn1.setDoubleClickedListener(new Component.DoubleClickedListener() {
            @Override
            public void onDoubleClick(Component component) {
                btn1.setText("被双击了");
            }
        });
    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}

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长按事件

• 接口名：LongClickedListener

public class MainAbilitySlice extends AbilitySlice{

    Button btn1;
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        btn1 = (Button) findComponentById(ResourceTable.Id_btn1);

        // 绑定长按事件
        btn1.setLongClickedListener(new Component.LongClickedListener() {
            @Override
            public void onLongClicked(Component component) {
                btn1.setText("被长按了");
            }
        });
    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}

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滑动事件(触摸事件)

• 接口名：TouchEventListener

滑动事件里面分为三个动作：按下不松，移动，抬起。

• PRIMARY_POINT_DOWN：按下不松。
• POINT_MOVE：移动。
• PRIMARY_POINT_UP：抬起。

手机坐标： 手机左上角的点为原点。 （向右为X轴 | 向下为Y轴 | 垂直于屏幕向上为Z轴）

import com.roydon.beautifyapp1.MainAbility;
import com.roydon.beautifyapp1.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Button;
import ohos.agp.components.Component;
import ohos.agp.components.DirectionalLayout;
import ohos.agp.window.dialog.ToastDialog;
import ohos.multimodalinput.event.MmiPoint;
import ohos.multimodalinput.event.TouchEvent;

public class MainAbilitySlice extends AbilitySlice{

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        DirectionalLayout dl = (DirectionalLayout) findComponentById(ResourceTable.Id_dl);

        dl.setTouchEventListener(new Component.TouchEventListener() {
            @Override
            public boolean onTouchEvent(Component component, TouchEvent touchEvent) {

                if (touchEvent.getAction()==TouchEvent.PRIMARY_POINT_DOWN){
                    System.out.println("按下");
                    //因为给布局 DirectionalLayout 绑定的触摸事件，所以可以获取手指在屏幕按下的位置
                    System.out.println("手指按下的坐标："+touchEvent.getPointerPosition(0));
                    MmiPoint position = touchEvent.getPointerPosition(0);
                    float pointX = position.getX();//按下点的横坐标
                    float pointY = position.getY();//按下点的纵坐标
                }else if(touchEvent.getAction()==TouchEvent.POINT_MOVE){
                    System.out.println("移动");
                    //移动时间同样有坐标方法，坐标随手指移动不断变化
                }else if(touchEvent.getAction()==TouchEvent.PRIMARY_POINT_UP){
                    System.out.println("松开");
                }

                return true;//若返回true继续事件，false反之
            }
        });

    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}

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