Camera preview reste blanc, mais aucuns crashs !
Bonjour à tous,
J'essais depuis quelques temps le développement Android. En ce moment, je tente de faire une application qui a besoin de la caméra, je voudrais le preview directement dans mon activity. J'ai utilisé des bout de codes de la doc notamment et comme résultat j'ai un preview qui reste blanc, la camera ne s'allume pas non plus (dans l'émulateur, j'utilise ma webcam intégrée)
Voici le code de mon activity qui utilise la caméra:
Code:
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| package com.guillaimej.testapplication.app;
import android.content.Intent;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.widget.Toast;
import android.view.SurfaceView;
import android.view.SurfaceHolder;
public class CameraInputActivity extends Activity{
private ImageButton returnButton = null;
private ImageButton domygifButton = null;
//private Camera camera = null;
private CameraInputView cameraView;
private SurfaceHolder previewHolder;
private FrameLayout cameraLayout = null;
// Check if the camera is free and return it
private static Camera isCameraAvailable() {
Camera cam = null;
try {
cam = Camera.open(0);
} catch (Exception e) {
}
return cam;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera_input);
returnButton = (ImageButton) findViewById(R.id.returnButton);
returnButton.setOnTouchListener(new ReturnButtonListener());
domygifButton = (ImageButton) findViewById(R.id.domygif);
cameraLayout = (FrameLayout) findViewById(R.id.camera_layout);
Camera camera = isCameraAvailable();
// Create our Preview view and set it as the content of our activity.
cameraView = new CameraInputView(this, camera);
cameraLayout.addView(cameraView);
}
} |
Le code qui créer le preview camera:
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| package com.guillaimej.testapplication.app;
import java.io.IOException;
import android.content.Context;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class CameraInputView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraInputView(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
System.out.println("Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// empty. Take care of releasing the Camera preview in your activity.
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (mHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
// set preview size and make any resize, rotate or
// reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
System.out.println("Error starting camera preview: " + e.getMessage());
}
}
} |
Et mon layout:
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| <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
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="com.guillaimej.testapplication.app.CameraInputActivity">
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/camera_layout"
android:layout_weight="0.2">
</FrameLayout>
<ImageButton
android:layout_width="100dp"
android:layout_height="100dp"
android:id="@+id/domygif"
android:layout_gravity="center_horizontal"
android:background="@drawable/flask"
android:clickable="true"
android:onClick="snapIt"
android:layout_weight="0.0"/>
<ImageButton
android:layout_width="60dp"
android:layout_height="60dp"
android:id="@+id/returnButton"
android:layout_gravity="center_horizontal"
android:background="@drawable/return_button"
android:layout_weight="0.0"/>
</LinearLayout> |
Dans mon manifest j'ai bien les 3 lignes suivantes:
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| <uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" /> |
Quelqu'un aurait une idée de comment fixé ca ??? merci par avance :)
