Android截屏保存png图片的实例代码

import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;

import android.app.activity;
import android.graphics.bitmap;
import android.graphics.rect;
import android.util.log;
import android.view.view;

public class screenshot {
    // 获取指定activity的截屏，保存到png文件
    private static bitmap takescreenshot(activity activity) {
        // view是你需要截图的view
        view view = activity.getwindow().getdecorview();
        view.setdrawingcacheenabled(true);
        view.builddrawingcache();
        bitmap b1 = view.getdrawingcache();

        // 获取状态栏高度
        rect frame = new rect();
        activity.getwindow().getdecorview().getwindowvisibledisplayframe(frame);
        int statusbarheight = frame.top;
        log.i("tag", "" + statusbarheight);

        // 获取屏幕长和高
        int width = activity.getwindowmanager().getdefaultdisplay().getwidth();
        int height = activity.getwindowmanager().getdefaultdisplay()
                .getheight();
        // 去掉标题栏
        // bitmap b = bitmap.createbitmap(b1, 0, 25, 320, 455);
        bitmap b = bitmap.createbitmap(b1, 0, statusbarheight, width, height
                - statusbarheight);
        view.destroydrawingcache();
        return b;
    }

    // 保存到sdcard
    private static void savepic(bitmap b, string strfilename) {
        fileoutputstream fos = null;
        try {
            fos = new fileoutputstream(strfilename);
            if (null != fos) {
                b.compress(bitmap.compressformat.png, 90, fos);
                fos.flush();
                fos.close();
            }
        } catch (filenotfoundexception e) {
            e.printstacktrace();
        } catch (ioexception e) {
            e.printstacktrace();
        }
    }

    // 程序入口
    public static void shoot(activity a) {
        screenshot.savepic(screenshot.takescreenshot(a), "sdcard/xx.png");
    }
}

需要注意的是，shoot方法只能在view已经被加载后方可调用。
或者在   

@override
    public void onwindowfocuschanged(boolean hasfocus) {
        // todo auto-generated method stub
        super.onwindowfocuschanged(hasfocus);
        screenshot.shoot(this);
    }中调用