在 Android 中按住触摸多个图像
我有这个 main.xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background"
>
<ImageView
android:id="@+id/img1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/z01"
/>
<ImageView
android:id="@+id/img2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/z02"
/>
</LinearLayout>
我想要实现的是：
- 当用户触摸并按住 img1 时，图片更改为按下的图片（即从 z01.png 更改为 z01_pressed.png）
- 当（例如）用户按住时从 img1 移动到 img2 时，img2 会被按下（将其图片从 z02.png 更改为 z02_pressed.png）并且 img1 返回到其状态（到z01.png）。
为了实现这一点，我在 onCreate 方法中编写了以下内容：
final ImageView img1 = (ImageView) findViewById(R.id.img1);
final ImageView img2 = (ImageView) findViewById(R.id.img2);
img1.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
img1.setBackgroundResource(R.drawable.z01_pressed);
return false;
}
});
img2.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
img2.setBackgroundResource(R.drawable.z01_pressed);
return false;
}
});
但是，这不起作用。我是不是搞错了什么？
I have this main.xml file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background"
>
<ImageView
android:id="@+id/img1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/z01"
/>
<ImageView
android:id="@+id/img2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/z02"
/>
</LinearLayout>
What I am trying to achieve is:
- when the user touch and hold img1, the picture changs to the pressed pic (i.e. changed from z01.png to z01_pressed.png)
- when (for example) the user moves from img1 to img2 while he holding, img2 get pressed (changed its picture from z02.png to z02_pressed.png) and img1 returns to its state (to z01.png).
to achieve this, I wrote this in onCreate method:
final ImageView img1 = (ImageView) findViewById(R.id.img1);
final ImageView img2 = (ImageView) findViewById(R.id.img2);
img1.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
img1.setBackgroundResource(R.drawable.z01_pressed);
return false;
}
});
img2.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
img2.setBackgroundResource(R.drawable.z01_pressed);
return false;
}
});
However, this does not work. Am I getting something wrong?
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评论（2）
您可以使用按钮并将自定义图像设置为该按钮的可绘制对象。这样，您就不必自己管理按下和未按下的状态。请参阅此链接：
http://blog.androgames.net/40/自定义按钮样式和主题/
You can use a button and set a custom image as the drawable of that button. That way, you won't have to manage the pressed and unpressed states yourself. See this link:
http://blog.androgames.net/40/custom-button-style-and-theme/
对于那些可能感兴趣的人：
这可以使用 OnDragListener 来完成。需要做一些工作才能实现这一点。为了让我的生活更轻松，我放弃了这一点。
To those who might be interested:
This can be done using OnDragListener. It needs some work to accomplish this. I gave up on that to make my life easier.