【发布时间】：2016-06-15 07:35:14
【问题描述】：
我正在发布示例，它会制作一张照片并让您看到预览，但我有一个问题：问题是，如果您尝试使用此代码，您将看到预览，但它的方向不正确，请在那里谁能解决这个问题？
public class MainActivity extends ActionBarActivity {
private ImageSurfaceView mImageSurfaceView;
private Camera camera;
private FrameLayout cameraPreviewLayout;
private ImageView capturedImageHolder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
cameraPreviewLayout = (FrameLayout)findViewById(R.id.camera_preview);
capturedImageHolder = (ImageView)findViewById(R.id.captured_image);
camera = checkDeviceCamera();
mImageSurfaceView = new ImageSurfaceView(MainActivity.this, camera);
cameraPreviewLayout.addView(mImageSurfaceView);
Button captureButton = (Button)findViewById(R.id.button);
captureButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
camera.takePicture(null, null, pictureCallback);
}
});
}
private Camera checkDeviceCamera(){
Camera mCamera = null;
try {
mCamera = Camera.open();
} catch (Exception e) {
e.printStackTrace();
}
return mCamera;
}
PictureCallback pictureCallback = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
if(bitmap==null){
Toast.makeText(MainActivity.this, "Captured image is empty", Toast.LENGTH_LONG).show();
return;
}
capturedImageHolder.setImageBitmap(scaleDownBitmapImage(bitmap, 300, 200 ));
}
};
private Bitmap scaleDownBitmapImage(Bitmap bitmap, int newWidth, int newHeight){
Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
return resizedBitmap;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
ImageSurfaceView 类
public class ImageSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
private Camera camera;
private SurfaceHolder surfaceHolder;
public ImageSurfaceView(Context context, Camera camera) {
super(context);
this.camera = camera;
this.surfaceHolder = getHolder();
this.surfaceHolder.addCallback(this);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
this.camera.setPreviewDisplay(holder);
this.camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
this.camera.stopPreview();
this.camera.release();
}
}
XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:baselineAligned="false">
<FrameLayout
android:id="@+id/camera_preview"
android:layout_width="match_parent"
android:layout_height="300dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/capture_button"
android:id="@+id/button"
android:layout_below="@+id/camera_preview"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp" />
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/captured_image"
android:layout_below="@+id/button"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="15dp"
android:contentDescription="@string/desc" />
问题是，如果您尝试此代码，您会看到预览，但它的方向不正确，请问有人可以解决这个问题吗？
【问题讨论】：
-
you'll see the preview but it is not oriented correctly用图片更新您的问题或详细说明问题所在。另外，请阅读How do I ask a good question? -
这个标题太笼统了，试着改一下来说明实际问题（比如“相机预览的方向不正确”）。