在我的应用程序中，我必须使用 FRONT CAMERA 拍照，但我不需要使用相机应用程序。我有一个带有按钮的自定义布局来拍照。我还需要将照片保存到位图，因为我必须将它发送到我的网络服务。
一个例子真的很有帮助。
我已经阅读了官方文档，但我没有得到它。我知道我必须使用 CameraPreview 类和 A CameraACtivity 但到目前为止我无法做到。需要帮忙。
问问题
1024 次
1 回答
4
好了，伙计，这段代码完全符合您的要求：
您可以从这里下载整个项目并使用它。
public class MainActivity extends Activity implements SurfaceHolder.Callback
{
private final int ANIMATION_DURATION = 500;
private final int MEDIA_TYPE_IMAGE = 1;
private final int MEDIA_TYPE_VIDEO = 2;
private Context context = MainActivity.this;
private Camera camera;
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private ImageView btn_shutter;
private LinearLayout btn_layout;
private TextView btn_retake;
private TextView btn_keep;
private boolean previewing = false;
private ImageView temp_pic;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main_layout);
surfaceView = (SurfaceView) findViewById(R.id.surfaceview);
btn_shutter = (ImageView) findViewById(R.id.btn_shutter);
btn_layout = (LinearLayout) findViewById(R.id.btn_layout);
btn_retake = (TextView) findViewById(R.id.btn_retake);
btn_keep = (TextView) findViewById(R.id.btn_keep);
temp_pic = (ImageView) findViewById(R.id.temp_pic);
try
{
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
camera = Camera.open();
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
}
catch (Exception e)
{
e.printStackTrace();
}
OnClickListener click = new OnClickListener()
{
@Override
public void onClick(View v)
{
switch(v.getId())
{
case R.id.btn_shutter:
{
camera.takePicture(null, null, mPicture);
onTakePick();
break;
}
case R.id.btn_retake:
{
camera.startPreview();
onRetakePic();
break;
}
case R.id.btn_keep:
{
new TakeScreeShot().execute();
break;
}
}
}
};
btn_shutter.setOnClickListener(click);
btn_retake.setOnClickListener(click);
btn_keep.setOnClickListener(click);
}
private final String TAG = "horia";
private PictureCallback mPicture = new PictureCallback()
{
@Override
public void onPictureTaken(byte [] data, Camera camera)
{
new ProcessRawBitmap(data).execute();
}
};
public static Bitmap getBitmapFromBytes(byte[] imageContent)
{
try
{
return BitmapFactory.decodeByteArray(imageContent, 0, imageContent.length);
}
catch(Exception e)
{
e.printStackTrace();
return null;
}
}
private void onRetakePic()
{
temp_pic.setVisibility(View.GONE);
surfaceView.setVisibility(View.VISIBLE);
final TranslateAnimation anim_hide = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_PARENT, 0,
Animation.RELATIVE_TO_PARENT, 1);
anim_hide.setDuration(ANIMATION_DURATION);
anim_hide.setFillAfter(true);
anim_hide.setAnimationListener(new AnimationListener()
{
@Override
public void onAnimationStart(Animation animation)
{
}
@Override
public void onAnimationRepeat(Animation animation)
{
}
@Override
public void onAnimationEnd(Animation animation)
{
btn_layout.setVisibility(View.GONE);
btn_layout.setAnimation(null);
final TranslateAnimation anim_show = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_PARENT, 1,
Animation.RELATIVE_TO_PARENT, 0);
anim_show.setDuration(ANIMATION_DURATION);
anim_show.setFillAfter(true);
anim_show.setAnimationListener(new AnimationListener()
{
@Override
public void onAnimationStart(Animation animation)
{
btn_shutter.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationRepeat(Animation animation)
{
}
@Override
public void onAnimationEnd(Animation animation)
{
btn_shutter.setAnimation(null);
}
});
btn_shutter.startAnimation(anim_show);
}
});
btn_layout.startAnimation(anim_hide);
}
private void onTakePick()
{
final TranslateAnimation anim_hide = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_PARENT, 0,
Animation.RELATIVE_TO_PARENT, 1);
anim_hide.setDuration(ANIMATION_DURATION);
anim_hide.setFillAfter(true);
anim_hide.setAnimationListener(new AnimationListener()
{
@Override
public void onAnimationStart(Animation animation)
{
}
@Override
public void onAnimationRepeat(Animation animation)
{
}
@Override
public void onAnimationEnd(Animation animation)
{
btn_shutter.setVisibility(View.GONE);
btn_shutter.setAnimation(null);
final TranslateAnimation anim_show = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_PARENT, 1,
Animation.RELATIVE_TO_PARENT, 0);
anim_show.setDuration(ANIMATION_DURATION);
anim_show.setFillAfter(true);
anim_show.setAnimationListener(new AnimationListener()
{
@Override
public void onAnimationStart(Animation animation)
{
btn_layout.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationRepeat(Animation animation)
{
}
@Override
public void onAnimationEnd(Animation animation)
{
btn_layout.setAnimation(null);
}
});
btn_layout.startAnimation(anim_show);
}
});
btn_shutter.startAnimation(anim_hide);
}
@Override
protected void onDestroy()
{
super.onDestroy();
try
{
try
{
if(null != camera)
{
camera.stopPreview();
camera.release();
camera = null;
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
{
try
{
if (previewing)
{
camera.stopPreview();
}
if(null != camera)
{
Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if(display.getRotation() == Surface.ROTATION_0)
{
// LOG.x("ROTATION_0");
camera.setDisplayOrientation(90);
}
if(display.getRotation() == Surface.ROTATION_90)
{
// LOG.x("ROTATION_90");
}
if(display.getRotation() == Surface.ROTATION_180)
{
// LOG.x("ROTATION_180");
}
if(display.getRotation() == Surface.ROTATION_270)
{
// LOG.x("ROTATION_270");
camera.setDisplayOrientation(180);
}
previewCamera();
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
@Override
public void surfaceCreated(SurfaceHolder holder)
{
}
@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
}
public void previewCamera()
{
try
{
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
previewing = true;
}
catch(Exception e)
{
e.printStackTrace();
}
}
private File getOutputMediaFile(int type)
{
if (true == isExternalStoragePresent())
{
File mediaStorageDir = new File(Environment.getExternalStorageDirectory().toString() + "/MyTestPicsFolder");
if (!mediaStorageDir.exists())
{
if (!mediaStorageDir.mkdirs())
{
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE)
{
mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
}
else if (type == MEDIA_TYPE_VIDEO)
{
mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_" + timeStamp + ".mp4");
}
else
{
return null;
}
return mediaFile;
}
else
{
try
{
new AlertDialog.Builder(context).setMessage("No storage space found, can't save the video.").setPositiveButton("Ok", null).show();
}
catch(Exception e)
{
e.printStackTrace();
}
return null;
}
}
private class TakeScreeShot extends AsyncTask<Object, Object, Object>
{
@Override
protected Object doInBackground(Object... params)
{
try
{
View v1 = getWindow().getDecorView().getRootView();
v1.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
File imageFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (imageFile == null)
{
Log.d(TAG, "Error creating media file, check storage permissions");
return null;
}
OutputStream fout = new FileOutputStream(imageFile);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fout);
fout.flush();
fout.close();
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
}
private Bitmap bitmapRotate(File f)
{
try
{
ExifInterface exif = new ExifInterface(f.getPath());
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
int angle = 0;
if (orientation == ExifInterface.ORIENTATION_ROTATE_90)
{
angle = 90;
}
else if (orientation == ExifInterface.ORIENTATION_ROTATE_180)
{
angle = 180;
}
else if (orientation == ExifInterface.ORIENTATION_ROTATE_270)
{
angle = 270;
}
Matrix mat = new Matrix();
mat.postRotate(angle);
Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, null);
return Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), mat, true);
}
catch (Exception e)
{
e.printStackTrace();
return null;
}
}
private class ProcessRawBitmap extends AsyncTask<Object, Object, Object>
{
private byte [] data;
public ProcessRawBitmap(byte [] data)
{
this.data = data;
}
@Override
protected Object doInBackground(Object... params)
{
Bitmap bit = getBitmapFromBytes(data);
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null)
{
Log.d(TAG, "Error creating media file, check storage permissions");
return null;
}
try
{
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
bit = bitmapRotate(pictureFile);
if(null != bit)
{
temp_pic.setVisibility(View.VISIBLE);
temp_pic.setImageBitmap(bit);
surfaceView.setVisibility(View.GONE);
}
pictureFile.delete();
}
catch (Exception e)
{
Log.d(TAG, "File not found: " + e.getMessage());
}
return null;
}
}
public static boolean isExternalStoragePresent()
{
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state))
{
// We can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
}
else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state))
{
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
}
else
{
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
if (false == ((mExternalStorageAvailable) && (mExternalStorageWriteable)))
{
// Toast.makeText(context, "SD card not present",
}
return (mExternalStorageAvailable) && (mExternalStorageWriteable);
}
}
于 2014-05-05T20:25:40.487 回答