首先写个工具类：

public class ScreenShotTool {

private Activity activity;

public ScreenShotTool(Activity activity) {

this.activity = activity;

}

public Bitmap getActivityBitmap() {

/**取得DecorView，这个View是你需要截图的界面*/

View view = activity.getWindow().getDecorView();

view.setDrawingCacheEnabled(true);

/**建立图片缓存*/

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;

/**获取屏幕宽和高*/

int width = activity.getWindowManager().getDefaultDisplay().getWidth();

int height = activity.getWindowManager().getDefaultDisplay().getHeight();

/**保存前去掉标题栏*/

Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight);

/**清除缓存*/

view.destroyDrawingCache();

return b;

}

/**保存到本地*/

private void compressBitmap(Bitmap b, File filePath) {

FileOutputStream fos = null;

try {

fos = new FileOutputStream(filePath);

if (null != fos) {

/**对图片进行压缩*/

b.compress(Bitmap.CompressFormat.PNG, 100, fos);

fos.flush();

fos.close();

}

}

catch (Exception e) {

e.printStackTrace();

}

}

public void saveScreenshopBitmap(File filePath) {

if (filePath == null) { return; }

if (!filePath.exists()) {

try {

filePath.createNewFile();

}

catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

compressBitmap(getActivityBitmap(), filePath);

}

}

--------------在activit中使用-----------

public class ScreenShotActivity extends Activity {

private Button saveBtn;

private Activity act;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_photo);

saveBtn=(Button) findViewById(R.id.photo_btn);

act=this;

saveBtn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

/**保存路径*/

String savePath = Environment.getExternalStorageDirectory()+"/ldm/myImages";

try {

File filePath = new File(savePath);

if(!filePath.exists()){

filePath.mkdirs();

}

/**文件路径*/

String filepath = savePath + "/today.png";

File file = new File(filepath);

if (!file.exists()) {

file.createNewFile();

}

/**把当前Activity截屏，也可以传入其它Activity*/

new ScreenShotTool(act).saveScreenshopBitmap(file);

}catch(Exception e){

e.printStackTrace();

}

}

});

}

}