I made my own android camera app using Java, and everything seems to work fine except that when i capture an image, it doesnt display in my directory -until- I delete one or more excisting files from that same directory. Do you guys have any idea why this is happening?
I've looked at my directory through my phone image gallery, and in Windows 10 file manager (via USB cable).
This is my code:
CameraDemo.java
package nl.arjenvangaal.takepicturev2;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
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.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;
public class CameraDemo extends Activity {
Preview preview;
Button saveButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); //load layout file
preview = new Preview(this); //create new camera preview
((FrameLayout) findViewById(R.id.preview)).addView(preview); //display new preview
//button listener
saveButton = (Button)findViewById(R.id.saveButton);
saveButton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
preview.camera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
});
}
ShutterCallback shutterCallback = new ShutterCallback() {
public void onShutter() {
}
};
/** Handles data for raw picture */
PictureCallback rawCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
}
};
/** Handles data for jpeg picture */
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss", Locale.US);
String date = dateFormat.format(new Date());
String photoFile = "Foto_"+ date + ".jpg";
File sdDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES); //mapje
String filename =sdDir + File.separator + photoFile; //mapje + / + filenaam
File pictureFile = new File(filename); //uiteindelijke bestandslocatie
FileOutputStream outStream; //me create new output
try {
outStream = new FileOutputStream(pictureFile);
outStream.write(data);
outStream.close();
Toast.makeText(getApplicationContext(), "Foto opgeslagen.", Toast.LENGTH_LONG).show();
} catch (IOException e) {
Toast.makeText(getApplicationContext(), "Foto kon niet worden opgeslagen.", Toast.LENGTH_LONG).show();
}
}
};
}
Preview.java
package nl.arjenvangaal.takepicturev2;
import java.io.IOException;
import java.util.List;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
class Preview extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "Preview";
SurfaceHolder mHolder;
public Camera camera;
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 = Camera.open();
try {
camera.setPreviewDisplay(holder);
camera.setDisplayOrientation(90); //Roteer het beeld 90 graden zodat het goed wordt weergegeven
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();
;
//voorkom error als je het programma afsluit en heropent
if (camera != null) {
camera.release();
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Camera.Parameters parameters = camera.getParameters();
List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
// You need to choose the most appropriate previewSize for your app
Camera.Size previewSize = previewSizes.get(0); // .... select one of previewSizes here
parameters.setPreviewSize(previewSize.width, previewSize.height);
camera.setParameters(parameters);
//voorkom error als je het programma afsluit en heropent
if (mHolder.getSurface() == null) {
return;
}
try {
camera.stopPreview();
} catch (Exception e) {
//You can ignore this, because this means the Preview doesn't Exist
//So, no need to try stopping
}
try {
camera.setPreviewDisplay(mHolder);
camera.startPreview();
} catch (Exception e) {
//Catch this
}
}
@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);
}
}
activity_main
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:id="@+id/layout">
<FrameLayout
android:id="@+id/preview"
android:layout_weight="1" android:layout_width="fill_parent"
android:layout_height="fill_parent">
</FrameLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Save" android:layout_gravity="center"
android:id="@+id/saveButton"
/>
</LinearLayout>
