如何在 Android 上提供像按钮一样的 imageview 点击效果?

2022-01-24 00:00:00 button android java imageview

我在我的 Android 应用程序中有 imageview，我使用它就像一个带有 onClick 事件的按钮，但您可能会猜到它在单击时不会给 imageview 一个可点击的效果.我怎样才能做到这一点?

I have imageview in my Android app that I am using like a button with the onClick event given, but as you might guess it is not giving imageview a clickable effect when clicked. How can I achieve that?

推荐答案

可以为点击/未点击状态设计不同的图片，并在onTouchListener中设置如下

You can design different images for clicked/not clicked states and set them in the onTouchListener as follows

final ImageView v = (ImageView) findViewById(R.id.button0);
        v.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View arg0, MotionEvent arg1) {
                switch (arg1.getAction()) {
                case MotionEvent.ACTION_DOWN: {
                    v.setImageBitmap(res.getDrawable(R.drawable.img_down));
                    break;
                }
                case MotionEvent.ACTION_CANCEL:{
                    v.setImageBitmap(res.getDrawable(R.drawable.img_up));
                    break;
                }
                }
                return true;
            }
        });

更好的选择是你定义一个选择器如下

The better choice is that you define a selector as follows

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true"   
        android:drawable="@drawable/img_down" />
    <item android:state_selected="false"   
        android:drawable="@drawable/img_up" />
</selector>

并选择事件中的图像:

v.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View arg0, MotionEvent arg1) {
                v.setSelected(arg1.getAction()==MotionEvent.ACTION_DOWN);
                return true;
            }
        });

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