LevelListDrawable的简单使用

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <ImageView
        android:id="@+id/image"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:src="@drawable/leveldrawable"/>

</RelativeLayout>

leveldrawable.xml

<?xml version="1.0" encoding="utf-8"?>
<level-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:drawable="@drawable/rect"
        android:maxLevel="0" />
    <item
        android:drawable="@drawable/oval"
        android:maxLevel="1" />
</level-list>

MainActivity.java

package com.lily.huangxingli.testleveldrawable;

import android.graphics.drawable.Drawable;
import android.graphics.drawable.LevelListDrawable;
import android.os.Message;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.widget.ImageView;

import android.os.Handler;


public class MainActivity extends ActionBarActivity {

    Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ImageView imageView= (ImageView) findViewById(R.id.image);
        final Drawable drawable=imageView.getDrawable();
        handler=new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                drawable.setLevel(0);
            }
        };
        if (drawable instanceof LevelListDrawable){
            drawable.setLevel(1);
            Message message=handler.obtainMessage();
            handler.sendMessageDelayed(message, 2000);
        }


    }



}

oval.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    android:shape="oval"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <size
        android:width="30dp"
        android:height="30dp"
        ></size>
    <gradient
        android:startColor="@android:color/holo_blue_bright"
        android:endColor="@android:color/holo_green_light"></gradient>

</shape>

rect.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    android:shape="rectangle"
    xmlns:android="http://schemas.android.com/apk/res/android">

   <corners
       android:radius="2dp"
       ></corners>
    <gradient android:startColor="@android:color/holo_blue_bright" android:endColor="@android:color/holo_red_light"></gradient>
    <size
        android:width="30dp"
        android:height="30dp"></size>
</shape>