package com.iceman.printscreen;

import java.io.File;
import java.io.FileOutputStream;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.os.Bundle;
import android.os.Environment;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

public class PrintScreenDemoActivity extends Activity {
    private Button mButton;
    private LinearLayout mLayout;
    private int mPrintNum;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LayoutInflater inf = this.getLayoutInflater();
        mLayout = (LinearLayout)inf.inflate(R.layout.main, null);
        setContentView(mLayout);
        mButton = (Button)findViewById(R.id.print_btn);
        mButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                GetandSaveCurrentImage();
                mPrintNum++;
                mButton.setText("截屏次数:"+mPrintNum);
            }
        });
    }
    private void GetandSaveCurrentImage()   
    {   
        //1.构建Bitmap   
        WindowManager windowManager = getWindowManager();   
        Display display = windowManager.getDefaultDisplay();   
        int w = display.getWidth();   
        int h = display.getHeight();   
           
        Bitmap Bmp = Bitmap.createBitmap( w, h, Config.ARGB_8888 );       
           
        //2.获取屏幕   
        View decorview = this.getWindow().getDecorView();  
        decorview.setDrawingCacheEnabled(true);    
        Bmp = decorview.getDrawingCache();    
        String SavePath = getSDCardPath()+"/PrintScreenDemo/ScreenImage"; 
       
        //3.保存Bitmap    
        try {   
            File path = new File(SavePath);   
            //文件   
            String filepath = SavePath + "/Screen_"+mPrintNum+".png";   
            File file = new File(filepath);   
            if(!path.exists()){   
                path.mkdirs();   
            }   
            if (!file.exists()) {   
                file.createNewFile();   
            }   
               
            FileOutputStream fos = null;   
            fos = new FileOutputStream(file);   
            if (null != fos) {   
                Bmp.compress(Bitmap.CompressFormat.PNG, 90, fos);   
                fos.flush();   
                fos.close();     
                   
                Toast.makeText(this, "截屏文件已保存至SDCard/PrintScreenDemo/ScreenImage/下", Toast.LENGTH_LONG).show();   
            }   
       
        } catch (Exception e) {   
            e.printStackTrace();   
        }   
    }   
     
       /** 
        * 获取SDCard的目录路径功能 
        * @return 
        */ 
    private String getSDCardPath(){ 
        File sdcardDir = null; 
        //判断SDCard是否存在 
        boolean sdcardExist = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED); 
        if(sdcardExist){ 
            sdcardDir = Environment.getExternalStorageDirectory(); 
        } 
        
        return sdcardDir.toString(); 
    } 
}
布局文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/print_btn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="截屏" />

</LinearLayout>
由于是把截屏的图片存放到sd卡里,所以要在manifest.xml文件中增加对sd卡的写入权限.