ImageWriter替代Android 19-22?

在Android API的23版本中,引入了ImageWriter类。 我需要在应用程序中使用这个类,它应该运行在api 19上。我怎样才能重新实现这个类? 有一些等价的代码(我有一个图像实例,我需要绘制到一个表面)?

Related of "ImageWriter替代Android 19-22?"

在这里你有一个代码,可以让你拍照并在Surface上预览。 我相信你可以根据你的目的调整代码。

这里是XML代码:

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <SurfaceView android:id="@+id/preview" android:layout_width="fill_parent" android:layout_height="fill_parent" /> <RelativeLayout android:layout_width="fill_parent" android:layout_height="100dip" android:layout_alignParentBottom="true" android:gravity="center_vertical" android:background="#A000"> <Button android:layout_width="100dip" android:layout_height="wrap_content" android:text="Cancel" android:onClick="onCancelClick" /> <Button android:layout_width="100dip" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:text="Snap Photo" android:onClick="onSnapClick" /> </RelativeLayout> </RelativeLayout> 

这里的Java代码:

 package app.test; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.List; import android.app.Activity; import android.hardware.Camera; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.Toast; public class PreviewActivity extends Activity implements SurfaceHolder.Callback, Camera.ShutterCallback, Camera.PictureCallback { Camera mCamera; SurfaceView mPreview; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mPreview = (SurfaceView)findViewById(R.id.preview); mPreview.getHolder().addCallback(this); mPreview.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); mCamera = Camera.open(); } @Override public void onPause() { super.onPause(); mCamera.stopPreview(); } @Override public void onDestroy() { super.onDestroy(); mCamera.release(); Log.d("CAMERA","Destroy"); } public void onCancelClick(View v) { finish(); } public void onSnapClick(View v) { mCamera.takePicture(this, null, null, this); } @Override public void onShutter() { Toast.makeText(this, "Click!", Toast.LENGTH_SHORT).show(); } @Override public void onPictureTaken(byte[] data, Camera camera) { //Here, we chose internal storage try { FileOutputStream out = openFileOutput("picture.jpg", Activity.MODE_PRIVATE); out.write(data); out.flush(); out.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } camera.startPreview(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Camera.Parameters params = mCamera.getParameters(); List<Camera.Size> sizes = params.getSupportedPreviewSizes(); Camera.Size selected = sizes.get(0); params.setPreviewSize(selected.width,selected.height); mCamera.setParameters(params); mCamera.setDisplayOrientation(90); mCamera.startPreview(); } @Override public void surfaceCreated(SurfaceHolder holder) { try { mCamera.setPreviewDisplay(mPreview.getHolder()); } catch (Exception e) { e.printStackTrace(); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { Log.i("PREVIEW","surfaceDestroyed"); } }