MainActivity如下:
package cc.testclipdrawable; import java.util.Timer; import java.util.TimerTask; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.widget.ImageView; import android.app.Activity; import android.graphics.drawable.ClipDrawable; /** * Demo描述: * 利用ClipDrawable实现照片的徐徐展开 * * 示例说明: * 1 在clipdrawable中使用clip来描述一张将被徐徐展开的图片 * android:drawable 设定图片资源 * android:clipOrientation 设定clip的方向 * android:gravity 设定clip时的对齐方式 * * 2 ClipDrawable对象可以调用setLevel()方法来设置clip区域的大小 * 其中0表示截取原图的大小为空,10000表示截取整张图片 * * 参考资料: * 疯狂Android讲义(第二版) 作者 李刚 * */ public class MainActivity extends Activity { private Timer mTimer; private Handler mHandler; private ImageView mImageView; private ClipDrawable mClipDrawable; private final int FLAG=9527; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private void init(){ mImageView=(ImageView) findViewById(R.id.imageView); mClipDrawable=(ClipDrawable) mImageView.getDrawable(); mHandler=new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what==FLAG) { //不断修改Level值,达到徐徐展开的效果 mClipDrawable.setLevel(mClipDrawable.getLevel()+500); } } }; mTimer=new Timer(); mTimer.schedule(new TimerTask() { @Override public void run() { Message message=new Message(); message.what=FLAG; mHandler.sendMessage(message); if (mClipDrawable.getLevel()>=10000) { mTimer.cancel(); } } }, 0, 300); } }
main.xml如下:
<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" > <ImageView android:id="@+id/imageView" android:layout_width="fill_parent" android:layout_height="fill_parent" android:src="@drawable/clipdrawable" /> </RelativeLayout>
clipdrawable如下:
<?xml version="1.0" encoding="utf-8"?> <clip xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/beauty" android:clipOrientation="horizontal" android:gravity="center"> </clip>