我无法告诉您为什么您会从某些设备而不是其他设备获得乱码数据，但我可以建议一种似乎对我的应用程序有效的解决方法。
您的示例代码将相机的 JPEG 缩小到 640x480，然后将其保存到 SD 卡。所以我猜你不需要全尺寸的相机图像。
如果这个假设成立，您可以完全跳过相机的takePicture() API，只将预览帧保存到 SD 卡。最简单的方法是使用setOneShotPreviewCallback():
mCamera.setOneShotPreviewCallback( new StillPictureCallback() );
这将调用一次，并从相机返回一个数据缓冲区：
private class StillPictureCallback implements Camera.PreviewCallback {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
mPictureTask = new SaveStillPictureTask();
byte[] myData = null;
if ( data != null ) {
myData = data.clone();
}
mPictureTask.execute(myData);
}
}
回调调用后台任务来压缩数据并将其保存到文件中。我唯一遗漏的代码是通过getCameraInfo() 向相机查询预览帧格式、宽度和高度的部分。另请注意，Android YUVImage 类是随 Froyo 引入的，因此如果您需要支持早期版本的 Android，则需要滚动自己的转换代码（StackOverflow 上有示例）。
/**
* Background task to compress captured image data and save to JPEG file.
*
*/
private class SaveStillPictureTask extends AsyncTask<byte[], Void, Void> {
private static final String TAG="VideoRecorder.SaveStillPictureTask";
@Override
protected Void doInBackground(byte[]... params) {
byte[] data = params[0];
FileOutputStream out = null;
Bitmap bitmap = null;
if ( data == null ) {
Log.e(TAG, "doInBackground: data is null");
return null;
}
try {
out = new FileOutputStream(mSnapshotFilePath);
// Use the preview image format, as documented in Android SDK javadoc
if ( (mPreviewImageFormat == ImageFormat.NV21) || (mPreviewImageFormat == ImageFormat.YUY2) ) {
saveYUVToJPEG( mCamera, out, data );
} else if (mPreviewImageFormat == ImageFormat.JPEG) {
Log.d(TAG, "directly write JPEG to storage");
out.write(data);
} else {
Log.d(TAG, "try decoding to byte array");
bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
if ( bitmap != null ) {
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
} else {
Log.e(TAG, "decodeByteArray failed, no decoded data");
}
}
}
catch (FileNotFoundException ignore) {;}
catch (IOException ignore) {;}
finally {
if ( out != null ) {
try {
out.close();
} catch (IOException ignore) {;}
out = null;
}
if ( bitmap != null ) {
bitmap.recycle();
bitmap = null;
}
data = null;
}
return null;
}
}
/**
* Save YUV image data (aka NV21 or YUV420sp) data to JPEG file.
*
* @param camera
* @param out
* @param data
*/
protected void saveYUVToJPEG( Camera camera, FileOutputStream out, byte[] data ) {
YuvImage yuvimg = null;
try {
int width = mPreviewWidth;
int height = mPreviewHeight;
Rect rect = new Rect();
rect.left = 0;
rect.top = 0;
rect.right = width - 1;
rect.bottom = height - 1; // The -1 is required, otherwise a buffer overrun occurs
yuvimg = new YuvImage(data, mPreviewImageFormat, width, height, null);
yuvimg.compressToJpeg(rect, 90, out);
} finally {
yuvimg = null;
}
}