Drawable资源---ClipDrawable资源

复制一张要截取的图片到drawable-mdpi下

在该文件夹下建立

my_clip.xml

<?xml version="1.0" encoding="utf-8"?>

<clip xmlns:android="http://schemas.android.com/apk/res/android" 

    android:drawable="@drawable/my_img"

    android:clipOrientation="vertical"

    android:gravity="top">

</clip>

activity_main.xml

<LinearLayout 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"

    tools:context=".MainActivity" 

    android:orientation="vertical">

    <ImageView android:id="@+id/imageView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/my_clip"/>

    

</LinearLayout>

MainActivity.java

package com.example.clipdrawabletest;

import android.os.Bundle;

import android.app.Activity;

import android.graphics.drawable.ClipDrawable;

import android.view.Menu;

import android.widget.ImageView;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ImageView imageView=(ImageView) super.findViewById(R.id.imageView);
//获取图片所显示的ClipDrawable对象
ClipDrawable drawable=(ClipDrawable) imageView.getDrawable();
//setLevel(int level)设置截取区域大小，当level为0时，截取的图片片段为空，为1000，截取整个图片
drawable.setLevel(3233);
}

}