取得当前屏幕的截图

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.os.Environment;
import android.util.Log;
import android.view.View;
public class ShotScreen {
	
	private static final String TAG="shotscreen";
	@SuppressWarnings("unused")
	private static Bitmap takeScreenShot(Activity activity){
		View view =activity.getWindow().getDecorView();
		view.setDrawingCacheEnabled(true);
		view.buildDrawingCache();
		Bitmap bitmap = view.getDrawingCache();
		Rect rect = new Rect();
		activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);
		int statusBarHeight = rect.top;
		System.out.println(statusBarHeight);
		
		int width =activity.getWindowManager().getDefaultDisplay().getWidth();
		int height =activity.getWindowManager().getDefaultDisplay().getHeight();
		
		Bitmap bitmap2 = Bitmap.createBitmap(bitmap,0,statusBarHeight, width, height - statusBarHeight);
		view.destroyDrawingCache();
		return bitmap2;
	}
	
	@SuppressWarnings("unused")
	private static void savePic(Bitmap bitmap,String filename){
		FileOutputStream fileOutputStream = null;
		try {
			fileOutputStream = new FileOutputStream(filename);
			if (fileOutputStream != null) {
				bitmap.compress(Bitmap.CompressFormat.PNG, 90, fileOutputStream);
				fileOutputStream.flush();
				fileOutputStream.close();
			}
		} catch (FileNotFoundException e) {
			Log.d(TAG, "Exception:FileNotFoundException");
			e.printStackTrace();
		} catch (IOException e) {
			Log.d(TAG, "IOException:IOException");
			e.printStackTrace();
		}
	}
	
	
	/**
	 * 
	 * @param a
	 */
	public static void shoot(Activity a){
		if (android.os.Environment.MEDIA_MOUNTED != "mounted") {
			ShotScreen.savePic(ShotScreen.takeScreenShot(a), "/sdcard/抽样.png");   
		}else{
			ShotScreen.savePic(ShotScreen.takeScreenShot(a), "/data/data/"+a.getPackageName()+"/抽样.png");
		}
    }

public class ScreenShot {
    // 获取指定Activity的截屏，保存到png文件
    public 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;
        System.out.println(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();
        savePic(b, "/sdcard/screen_test.png");
        return b;
    }
 
    // 保存到sdcard
    public 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();
        }
    }
 
    /**
     * 把View对象转换成bitmap
     * */
    public static Bitmap convertViewToBitmap(View view) {
        view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();
        if (bitmap != null) {
            System.out.println("这不是nullde1");
            Log.d("nullde1", "nullde1");
        } else {
            System.out.println("这nullnulllnulnlul");
        }
        return bitmap;
    }
 
    // 程序入口1
    public static void shoot(Activity a) {
        ScreenShot.savePic(ScreenShot.takeScreenShot(a), "/sdcard/screen_test.png");
    }
 
    // 程序入口2
    public static void shootView(View view) {
        ScreenShot.savePic(ScreenShot.convertViewToBitmap(view),
                "sdcard/xx.png");
    }
 
    public static Bitmap getViewBitmap(View v) {
        v.clearFocus();
        v.setPressed(false);
 
        boolean willNotCache = v.willNotCacheDrawing();
        v.setWillNotCacheDrawing(false);
 
        // Reset the drawing cache background color to fully transparent
        // for the duration of this operation
        int color = v.getDrawingCacheBackgroundColor();
        v.setDrawingCacheBackgroundColor(0);
 
        if (color != 0) {
            v.destroyDrawingCache();
        }
        v.buildDrawingCache();
        Bitmap cacheBitmap = v.getDrawingCache();
        if (cacheBitmap == null) {
            Log.e("TTTTTTTTActivity", "failed getViewBitmap(" + v + ")",
                    new RuntimeException());
            return null;
        }
 
        Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
 
        // Restore the view
        v.destroyDrawingCache();
        v.setWillNotCacheDrawing(willNotCache);
        v.setDrawingCacheBackgroundColor(color);
 
        return bitmap;
    }
 
    /**
     * 截取scrollview的屏幕
     * **/
    public static Bitmap getBitmapByView(ScrollView scrollView) {
        int h = 0;
        Bitmap bitmap = null;
        // 获取listView实际高度
        for (int i = 0; i