總結了一個方法，實現了在Android當前Activity的截圖，本人測試確實通過了，不過有朋友說截出來的圖是黑色的，不能看。我心想，這沒有問題啊，相同的代碼我就可以執行通過，并沒有沒有在意這個問題。可是，今天我再調用那個方法時，截出來的圖部分是黑屏。我當時就郁悶了。網上的東西很全，但同時很亂。有一個大神用的是引用Linux下編譯出來的庫，又用到什么JNI我完全不懂，貌似可以實現截屏。當時這個方法太麻煩，我看了一下覺得沒有信心，就又繼續尋找其他的方法。

我截圖出現黑屏的原因是在Activity中用到了SurfaceView控件，在XML布局中的控件可以完整的顯示出來但是有surfaceView的時候就出現黑屏了。具體原因我想的是因為在surfaceView中用線程不停的繪圖，操作太頻繁了，原來那種方法沒有辦法截出來。在surfaceView中繪圖的原理：

用另外一個Canvas對象不停的把要畫到surfaceView中的對象畫到這個額外的canvas中，再聲明一個Bitmap bitmap對象，注意這個bitmap不是你畫在surfaceView中的對象，而是你的目標對象，就是需要截的圖。你只需要這樣：Canvas canvas=new Canvas(bitmap)，接著用canvas.drawBitmap(curBitmap, 0, 0, null),你就可以把當前的的要畫的到SurfaceView保存到bitmap中，然后把bitmap保存出來就可以了。PS：這只是截出來SurfaceView中圖像，如果想截取背景圖片，可以把surfaceView設置為透明。網上有很多種方法，這里就不介紹了。

貼出網上可以運行的代碼：

menu.xml:

Element.java

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

public class Element {

private float mX;

private float mY;

private Bitmap mBitmap;

public Element(Resources res, int x, int y) {

mBitmap = BitmapFactory.decodeStream(new BufferedInputStream(res.openRawResource(R.drawable.icon)));

mX = x - mBitmap.getWidth() / 2;

mY = y - mBitmap.getHeight() / 2;

}

public void doDraw(Canvas canvas) {

canvas.drawBitmap(mBitmap, mX, mY, null);

}

}

Panel.java

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.ArrayList;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.os.Environment;

import android.util.Log;

import android.view.MotionEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

public class Panel extends SurfaceView implements SurfaceHolder.Callback

{

public static float mWidth;

public static float mHeight;

private ViewThread mThread;

private ArrayList mElements = new ArrayList();

private int mElementNumber = 0;

private Paint mPaint = new Paint();

private String mScreenshotPath = Environment.getExternalStorageDirectory()

+ "/droidnova";

public Panel(Context context)

{

super(context);

getHolder().addCallback(this);

mThread = new ViewThread(this);

mPaint.setColor(Color.WHITE);

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height)

{

mWidth = width;

mHeight = height;

}

@Override

public void surfaceCreated(SurfaceHolder holder)

{

if (!mThread.isAlive())

{

mThread = new ViewThread(this);

mThread.setRunning(true);

mThread.start();

}

}

@Override

public void surfaceDestroyed(SurfaceHolder holder)

{

if (mThread.isAlive())

{

mThread.setRunning(false);

}

}

@Override

public boolean onTouchEvent(MotionEvent event)

{

synchronized (mElements)

{

mElements.add(new Element(getResources(), (int) event.getX(),

(int) event.getY()));

mElementNumber = mElements.size();

}

return super.onTouchEvent(event);

}

/**

* If called, creates a screenshot and saves it as a JPG in the folder

* "droidnova" on the sdcard.

*/

//在surfaceView上不停的繪圖

public void doDraw(long elapsed, Canvas canvas)

{

canvas.drawColor(Color.BLACK);

synchronized (mElements)

{

for (Element element : mElements)

{

element.doDraw(canvas);

}

}

canvas.drawText("FPS: " + Math.round(1000f / elapsed) + " Elements: "

+ mElementNumber, 10, 10, mPaint);

}

public void saveScreenshot()

{

if (ensureSDCardAccess())

{

Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(),

Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(bitmap);

//在surfaceView上不停的繪圖

doDraw(1, canvas);

File file = new File(mScreenshotPath + "/"

+ System.currentTimeMillis() + ".jpg");

FileOutputStream fos;

try

{

fos = new FileOutputStream(file);

bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);

fos.close();

}

catch (FileNotFoundException e)

{

Log.e("Panel", "FileNotFoundException", e);

}

catch (IOException e)

{

Log.e("Panel", "IOEception", e);

}

}

}

/**

* Helper method to ensure that the given path exists. TODO: check external

* storage state

*/

private boolean ensureSDCardAccess()

{

File file = new File(mScreenshotPath);

if (file.exists())

{

return true;

}

else if (file.mkdirs())

{

return true;

}

return false;

}

}

ScreenshotActivity.java

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.view.Window;

public class ScreenshotActivity extends Activity {

private Panel mPanel;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

mPanel = new Panel(this);

setContentView(mPanel);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

MenuInflater inflater = getMenuInflater();

inflater.inflate(R.menu.menu, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.screenshot:

mPanel.saveScreenshot();

break;

}

return true;

}

}

ViewThread.java

import android.graphics.Canvas;

import android.view.SurfaceHolder;

public class ViewThread extends Thread {

private Panel mPanel;

private SurfaceHolder mHolder;

private boolean mRun = false;

private long mStartTime;

private long mElapsed;

public ViewThread(Panel panel) {

mPanel = panel;

mHolder = mPanel.getHolder();

}

public void setRunning(boolean run) {

mRun = run;

}

@Override

public void run() {

Canvas canvas = null;

mStartTime = System.currentTimeMillis();

while (mRun) {

canvas = mHolder.lockCanvas();

if (canvas != null) {

mPanel.doDraw(mElapsed, canvas);

mElapsed = System.currentTimeMillis() - mStartTime;

mHolder.unlockCanvasAndPost(canvas);

}

mStartTime = System.currentTimeMillis();

}

}

}

其實這很好理解。由于我的代碼寫在整個項目中，跌出來比較麻煩，就貼了一個以可以完整通過的工程。

下載地址：

下載在Linux公社的1號FTP服務器里，下載地址：

用戶名：www.linuxidc.com

密碼：www.muu.cc

在 2012年LinuxIDC.com\7月\Android中截圖(surfaceView)源碼

關于截屏，暫時我的需求已經滿足了，不知道這符合其他情況么？歡迎有興趣的人一起交流。

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