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Android TransitionDrawable&StateListDrawable的使用
这个SDK里面的一段代码:比较适合来做一个简单的动画(比如文字的渐变放大效果等)
Resources res = getResources(); TransitionDrawable transition = (TransitionDrawable) res .getDrawable(R.drawable.expand_collapse); ImageView image = (ImageView) findViewById(R.id.toggle_image); image.setImageDrawable(transition); //当间隔一秒后显示 transition.startTransition(1000);这个expand_collapse.xml文件放到Drawable文件夹当中:
<?xml version="1.0" encoding="utf-8"?> <transition xmlns:andro> <item android:drawable="@drawable/image_expand" /> <item android:drawable="@drawable/image_collapse" /> </transition>
根据Button状态(normal,focused,pressed)显示不同背景图片
1. 在res/drawable目录下添加一个xml文件，用来描述Button在不同状态下对应的不同图片。我这里给该xml文件命名为btn_background.xml
<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:andro>
<item android:state_pressed="true"
android:drawable="@drawable/btn_pressed" /> <!-- pressed -->
<item android:state_focused="true"
android:drawable="@drawable/btn_normal" /> <!-- focused -->
<item android:drawable="@drawable/btn_normal" /> <!-- default -->
</selector>
2. 在res/layout目录下，对应的layout xml文件中，将Button的android:background属性设置为btn_background即可。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/btn_background"
/>
</LinearLayout>
也可以代码实现：
Integer[] mButtonState = { R.drawable.defaultbutton,
R.drawable.focusedpressed, R.drawable.pressed };
Button mButton = (Button) findViewById(R.id.button);
mButton.setBackgroundDrawable(myButton.setbg(mButtonState));
public StateListDrawable setbg(Integer[] mImageIds) {
StateListDrawable bg = new StateListDrawable();
Drawable normal = this.getResources().getDrawable(mImageIds[0]);
Drawable selected = this.getResources().getDrawable(mImageIds[1]);
Drawable pressed = this.getResources().getDrawable(mImageIds[2]);
bg.addState(View.PRESSED_ENABLED_STATE_SET, pressed);
bg.addState(View.ENABLED_FOCUSED_STATE_SET, selected);
bg.addState(View.ENABLED_STATE_SET, normal);
bg.addState(View.FOCUSED_STATE_SET, selected);
bg.addState(View.EMPTY_STATE_SET, normal);
return bg;
}
Drawable资源：StateListDrawable，PaintDrawable，ShapeDrawable，NinePatchDrawable，BitmapDrawable
https://www.cnblogs.com/xirihanlin/archive/2010/06/14/1758145.html
LayerDrawable层叠样式layer-list
https://gundumw100.iteye.com/admin/blogs/896923
代码实现ColorStateList及StateListDrawable
https://blog.csdn.net/sodino/article/details/6797821
最后更新：2017-04-02 16:47:36