1. 只截取自己应用内部界面
1.1 只截取自己应用内部界面
View dView = getWindow().getDecorView();
dView.setDrawingCacheEnabled(true);
dView.buildDrawingCache();
Bitmap bitmap = Bitmap.createBitmap(dView.getDrawingCache());
if (bitmap != null) {
try {
// 获取内置SD卡路径
String sdCardPath = Environment.getExternalStorageDirectory().getPath();
// 图片文件路径
String filePath = sdCardPath + File.separator + "screenshot.png";
File file = new File(filePath);
FileOutputStream os = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
os.flush();
os.close();
DebugLog.d("a7888", "存储完成");
} catch (Exception e) {
}
}
1.2 截取某个控件或者区域
两种方案：
- 跟上面差不多，只不过view不适用根view，而是使用某个某个控件
View dView = title;
dView.setDrawingCacheEnabled(true);
dView.buildDrawingCache();
Bitmap bitmap = Bitmap.createBitmap(dView.getDrawingCache());
- 手动draw
View dView = titleTv;
Bitmap bitmap = Bitmap.createBitmap(dView.getWidth(), dView.getHeight(), Bitmap.Config.ARGB_8888);
//使用Canvas，调用自定义view控件的onDraw方法，绘制图片
Canvas canvas = new Canvas(bitmap);
dView.draw(canvas);
2. 截取非含当前应用的屏幕部分（最佳官方方案）
Android 在5.0 之后支持了实时录屏的功能。通过实时录屏我们可以拿到截屏的图像。同时可以通过在Service中处理实现后台的录屏。具体的类讲解大家自行网上查阅。
大体步骤：
1.初始化一个MediaProjectionManager
MediaProjectionManager mMediaProjectionManager = (MediaProjectionManager)getApplication().getSystemService(Context.MEDIA_PROJECTION_SERVICE);
2.创建intent,并启动Intent。注意这里是startActivityForResult
startActivityForResult(mMediaProjectionManager.createScreenCaptureIntent(), REQUEST_MEDIA_PROJECTION);
3.在onActivityResult中拿到Mediaprojection
mResultCode = resultCode;
mResultData = data;
mMediaProjection = mMediaProjectionManager.getMediaProjection(mResultCode, mResultData);
4.设置VirtualDisplay 将图像和展示的View关联起来。一般来说我们会将图像展示到SurfaceView，这里为了为了便于拿到截图，我们使用ImageReader，他内置有SurfaceView。
mImageReader = ImageReader.newInstance(windowWidth, windowHeight, 0x1, 2); //ImageFormat.RGB_565
mVirtualDisplay = mMediaProjection.createVirtualDisplay("screen-mirror",
windowWidth, windowHeight, mScreenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
mImageReader.getSurface(), null, null);
5.通过ImageReader拿到截图
strDate = dateFormat.format(new java.util.Date());
nameImage = pathImage+strDate+".png";
Image image = mImageReader.acquireLatestImage();
int width = image.getWidth();
int height = image.getHeight();
final Image.Plane[] planes = image.getPlanes();
final ByteBuffer buffer = planes[0].getBuffer();
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int rowPadding = rowStride - pixelStride * width;
Bitmap bitmap = Bitmap.createBitmap(width+rowPadding/pixelStride, height, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
bitmap = Bitmap.createBitmap(bitmap, 0, 0,width, height);
image.close();
6.注意截屏之后要及时关闭VirtualDisplay ，因为VirtualDisplay 是十分消耗内存和电量的。
if (mVirtualDisplay == null) {
return;
}
mVirtualDisplay.release();
mVirtualDisplay = null;
3. 截取长屏
截取长屏其实原理就是截取整个ScrollView或者ListView的视图，因此实现原理跟上面中提到的截取某个控件的View基本一致。
- ScrollView 实现截屏
/**
* 截取scrollview的屏幕
* **/
public static Bitmap getScrollViewBitmap(ScrollView scrollView) {
int h = 0;
Bitmap bitmap;
for (int i = 0; i < scrollView.getChildCount(); i++) {
h += scrollView.getChildAt(i).getHeight();
}
// 创建对应大小的bitmap
bitmap = Bitmap.createBitmap(scrollView.getWidth(), h,
Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas(bitmap);
scrollView.draw(canvas);
return bitmap;
}
- ListView实现截屏
/**
* 截图listview
* **/
public static Bitmap getListViewBitmap(ListView listView,String picpath) {
int h = 0;
Bitmap bitmap;
// 获取listView实际高度
for (int i = 0; i < listView.getChildCount(); i++) {
h += listView.getChildAt(i).getHeight();
}
Log.d(TAG, "实际高度:" + h);
Log.d(TAG, "list 高度:" + listView.getHeight());
// 创建对应大小的bitmap
bitmap = Bitmap.createBitmap(listView.getWidth(), h,
Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas(bitmap);
listView.draw(canvas);
return bitmap;
}
- WebView实现截屏
//这是webview的，利用了webview的api
private static Bitmap captureWebView(WebView webView) {
Picture snapShot = webView.capturePicture();
Bitmap bmp = Bitmap.createBitmap(snapShot.getWidth(),
snapShot.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bmp);
snapShot.draw(canvas);
return bmp;
}
4. 实时截屏
可参考2中Android 在5.0的做法，进行实时录制。
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