Linux4ever
Fortgeschrittenes Mitglied
- 27
Hallihallo Foren-Gemeinde,
ich habe eine hier ein Teil meiner App, die ein Foto mit der Frontkamera machen soll.
Main:
Preview:
Jedoch scheint preview.camera immer null zu sein:
Danke im Voraus,
Freddy
ich habe eine hier ein Teil meiner App, die ein Foto mit der Frontkamera machen soll.
Main:
Code:
package de.fpprogs.whounlocked;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import de.fpprogs.whounlocks.R;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.FrameLayout;
public class ActivitymainActivity extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activitymain);
Preview preview = new Preview(this);
((FrameLayout) findViewById(R.id.cameraPreview)).addView(preview);
if (preview.camera == null)
{
Log.e("Whounlocked", "preview.camera is null");
try
{
preview.camera.stopPreview();
preview.camera.release();
finish();
}
catch (RuntimeException e)
{
e.printStackTrace();
}
}
else
{
preview.camera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
}
ShutterCallback shutterCallback = new ShutterCallback() {
public void onShutter()
{
Log.d("Whounlocked", "onShutter'd");
}
};
/** Handles data for raw picture */
PictureCallback rawCallback = new PictureCallback()
{
public void onPictureTaken(byte[] data, Camera camera)
{
Log.d("Whounlocked", "onPictureTaken - raw");
}
};
PictureCallback jpegCallback = new PictureCallback()
{
@Override
public void onPictureTaken(byte[] data, Camera camera)
{
File pictureFile = getOutputMediaFile();
if (pictureFile == null)
{
Log.d("Whounlocked", "pictureFile is null");
return;
}
try
{
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
};
@SuppressLint("SimpleDateFormat")
private static File getOutputMediaFile()
{
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"Test");
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
if (!mediaStorageDir.exists())
{
if (!mediaStorageDir.mkdirs())
{
Log.d("Whounlocked", "failed to create directory");
return null;
}
}
// Create a media file name
timeStamp = "test123";
File mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
Log.d("Whounlocked", mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
return mediaFile;
}
}Preview:
Code:
package de.fpprogs.whounlocked;
import java.io.IOException;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class Preview extends SurfaceView implements SurfaceHolder.Callback
{
private static final String TAG = "Preview";
SurfaceHolder mHolder;
public Camera camera;
@SuppressWarnings("deprecation")
Preview(Context context)
{
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
camera = openFrontFacingCamera();
try {
camera.setPreviewDisplay(holder);
camera.setPreviewCallback(new PreviewCallback()
{
public void onPreviewFrame(byte[] data, Camera arg1)
{
Preview.this.invalidate();
}
});
}
catch (IOException e)
{
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder)
{
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
camera.stopPreview();
camera = null;
}
@SuppressWarnings("deprecation")
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(w, h);
parameters.setPictureFormat(PixelFormat.JPEG);
camera.setParameters(parameters);
camera.setParameters(parameters);
camera.setDisplayOrientation(90);
camera.startPreview();
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
Paint p = new Paint(Color.RED);
Log.d(TAG, "draw");
canvas.drawText("PREVIEW", canvas.getWidth() / 2,
canvas.getHeight() / 2, p);
}
private Camera openFrontFacingCamera()
{
int cameraCount = 0;
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for ( int camIdx = 0; camIdx < cameraCount; camIdx++ ) {
Camera.getCameraInfo( camIdx, cameraInfo );
if ( cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT )
{
try
{
cam = Camera.open(camIdx);
}
catch (RuntimeException e)
{
e.printStackTrace();
}
}
}
if (cam == null)
{
try
{
cam = Camera.open();
}
catch (RuntimeException e)
{
e.printStackTrace();
}
}
return cam;
}
}Jedoch scheint preview.camera immer null zu sein:
Wisst ihr wo der Fehler liegt??
Danke im Voraus,
Freddy