ImageView:在新闻发布时更改图像 [英] ImageView: change image on press, and on release

问题描述

我将在按下imageView图片时对其进行更改，并在释放压力时再次对其进行更改.该ImageView包含一个按钮的图片，当我按下按钮时，我会通过更改图像给用户一个反馈(就像他按下普通按钮时一样).这是我的代码:

I would change imageView picture when it's pressed, and change it again when pressure is released. That ImageView contains picture of a button, and when is pressed i would give to user a feedback (like when he press a normal button) by change image. This is my code:

final ImageView imageView = (ImageView) findViewById(R.id.imageView1);
imageView.setOnTouchListener(new OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        Log.i("IMAGE", "motion event: " + event.toString());
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
            imageView.setImageResource(R.drawable.button_hover);
        }
        case MotionEvent.ACTION_UP: {
            imageView.setImageResource(R.drawable.button);
        }
        }
        return false;
    }
    });

这是xml

 <ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:contentDescription="std_button"
    android:src="@drawable/button" />

但是它不起作用.如果我仅使用ACTION_DOWN事件，则可以根据需要更改图片， 怎么了?

but it doesn't work. If i use only ACTION_DOWN event, image change as i want, What's wrong?

推荐答案

尝试添加中断；在每种情况之后，

Try add break; after each case,

并且正如giozh在onTouch中所说，我始终返回false，因此触摸事件结果始终不被占用.只需在每个case语句后将return设置为真.

And as giozh said inside onTouch i return always false, so touch event result always not consumed. Just put return true after each case statement.

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