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我有一个ImageButton,我想突出显示 - 例如。下载完成后闪烁。转换为ImageButton背景
我想要的背景设置为TransitionDrawable
和重置回当过渡完成,但我得到怪异的结果:
- 按钮的填充消失,一旦过渡激活和ISN恢复原始绘图时,恢复原状。
- 过渡仅发生在按钮的笔触(边框)上,而不是填充背景区域的渐变。
这是Java代码,我使用激活过渡,扭转这种局面,恢复原有绘制背景:
downloadButton.setBackgroundResource(R.drawable.animate_background);
Drawable background = downloadButton.getBackground().getCurrent();
if (background instanceof TransitionDrawable) {
TransitionDrawable transition = (TransitionDrawable) background;
transition.startTransition(300);
downloadButton.postDelayed(new Runnable() {
@Override
public void run() {
// reverse the transition after it completes
Drawable background = downloadButton.getBackground().getCurrent();
if (background instanceof TransitionDrawable) {
TransitionDrawable transition = (TransitionDrawable) background;
transition.reverseTransition(200);
downloadButton.postDelayed(new Runnable() {
@Override
public void run() {
// restore original background
downloadButton.setBackgroundResource(R.drawable.custom_button);
}
}, 200); // after reverse transition
}
}
}, 300); // after transition
}
这是在布局XML按钮:
<ImageButton
android:id="@id/download_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/custom_button"
android:padding="14dp"
android:src="@drawable/download_icon" />
这是custom_button drawable的xml:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" >
<shape>
<solid android:color="#343434" />
<stroke android:width="1dp" android:color="#171737" />
<corners android:radius="5dp" />
</shape>
</item>
<item>
<shape>
<gradient android:startColor="#343434" android:endColor="#171737" android:angle="270" />
<stroke android:width="1dp" android:color="#171717" />
<corners android:radius="5dp" />
</shape>
</item>
过渡 “animate_background” XML:
<?xml version="1.0" encoding="UTF-8"?>
<transition xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/animate_start" />
<item android:drawable="@drawable/animate_end" />
</transition>
动画开始XML(动画端很相似,只是不同的颜色梯度和中风)
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<gradient android:startColor="#34F434" android:endColor="#174717" android:angle="270" />
<stroke android:width="2dp" android:color="#17F717" />
<corners android:radius="5dp" />
</shape>