Bonjour,

Dans une application, j'ai besoin de faire avancer une activité bien précise aux dépens d'une autre.

Voilà mon code :

Main.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
 
  <FrameLayout
    android:id="@+id/cameraPreview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1"
  />
 
  <TextView
    android:id="@+id/scanText"
    android:text="Scanning..."
    android:layout_height="wrap_content" 
    android:layout_width="match_parent">
  </TextView>
  <Button
    android:id="@+id/ScanButton"
    android:text="Scan"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
  />
</LinearLayout>
AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="net.sourceforge.zbar.android.CameraTest"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <application android:label="@string/app_name" >
        <activity android:name="CameraTestActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>
CamerTestActivity.java
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/*
 * Basic no frills app which integrates the ZBar barcode scanner with
 * the camera.
 * 
 * Created by lisah0 on 2012-02-24
 */
package net.sourceforge.zbar.android.CameraTest;
 
import net.sourceforge.zbar.android.CameraTest.CameraPreview;
 
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
 
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.FrameLayout;
import android.widget.Button;
 
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.Size;
 
import android.widget.TextView;
import android.graphics.ImageFormat;
 
/* Import ZBar Class files */
import net.sourceforge.zbar.ImageScanner;
import net.sourceforge.zbar.Image;
import net.sourceforge.zbar.Symbol;
import net.sourceforge.zbar.SymbolSet;
import net.sourceforge.zbar.Config;
 
public class CameraTestActivity extends Activity
{
    private Camera mCamera;
    private CameraPreview mPreview;
    private Handler autoFocusHandler;
 
    TextView scanText;
    Button scanButton;
 
    ImageScanner scanner;
 
    private boolean barcodeScanned = false;
    private boolean previewing = true;
 
    static {
        System.loadLibrary("iconv");
    } 
 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        setContentView(R.layout.main);
 
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
 
        autoFocusHandler = new Handler();
        mCamera = getCameraInstance();
 
        /* Instance barcode scanner */
        scanner = new ImageScanner();
        scanner.setConfig(0, Config.X_DENSITY, 3);
        scanner.setConfig(0, Config.Y_DENSITY, 3);
 
        mPreview = new CameraPreview(this, mCamera, previewCb, autoFocusCB);
        FrameLayout preview = (FrameLayout)findViewById(R.id.cameraPreview);
        preview.addView(mPreview);
 
        scanText = (TextView)findViewById(R.id.scanText);
 
        scanButton = (Button)findViewById(R.id.ScanButton);
 
        scanButton.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    if (barcodeScanned) {
                        barcodeScanned = false;
                        scanText.setText("Scanning...");
                        mCamera.setPreviewCallback(previewCb);
                        mCamera.startPreview();
                        previewing = true;
                        mCamera.autoFocus(autoFocusCB);
                    }
                }
            });
    }
 
    public void onPause() {
        super.onPause();
        releaseCamera();
    }
 
    /** A safe way to get an instance of the Camera object. */
    public static Camera getCameraInstance(){
        Camera c = null;
        try {
            c = Camera.open();
        } catch (Exception e){
        }
        return c;
    }
 
    private void releaseCamera() {
        if (mCamera != null) {
            previewing = false;
            mCamera.setPreviewCallback(null);
            mCamera.release();
            mCamera = null;
        }
    }
 
    private Runnable doAutoFocus = new Runnable() {
            public void run() {
                if (previewing)
                    mCamera.autoFocus(autoFocusCB);
            }
        };
 
    PreviewCallback previewCb = new PreviewCallback() {
            public void onPreviewFrame(byte[] data, Camera camera) {
                Camera.Parameters parameters = camera.getParameters();
                Size size = parameters.getPreviewSize();
 
                Image barcode = new Image(size.width, size.height, "Y800");
                barcode.setData(data);
 
                int result = scanner.scanImage(barcode);
 
                if (result != 0) {
                    previewing = false;
                    mCamera.setPreviewCallback(null);
                    mCamera.stopPreview();
 
                    SymbolSet syms = scanner.getResults();
                    for (Symbol sym : syms) {
                        scanText.setText("barcode result " + sym.getData());
                        barcodeScanned = true;
                    }
                }
            }
        };
 
    // Mimic continuous auto-focusing
    AutoFocusCallback autoFocusCB = new AutoFocusCallback() {
            public void onAutoFocus(boolean success, Camera camera) {
                autoFocusHandler.postDelayed(doAutoFocus, 1000);
            }
        };
}
CameraPreview.java
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/*
 * Barebones implementation of displaying camera preview.
 * 
 * Created by lisah0 on 2012-02-24
 */
package net.sourceforge.zbar.android.CameraTest;
 
import java.io.IOException;
 
import android.app.Activity;
import android.os.Bundle;
 
import android.util.Log;
 
import android.view.View;
import android.view.Surface;
import android.view.SurfaceView;
import android.view.SurfaceHolder;
 
import android.content.Context;
 
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.Parameters;
 
/** A basic Camera preview class */
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
    private SurfaceHolder mHolder;
    private Camera mCamera;
    private PreviewCallback previewCallback;
    private AutoFocusCallback autoFocusCallback;
 
    public CameraPreview(Context context, Camera camera,
                         PreviewCallback previewCb,
                         AutoFocusCallback autoFocusCb) {
        super(context);
        mCamera = camera;
        previewCallback = previewCb;
        autoFocusCallback = autoFocusCb;
 
        /* 
         * Set camera to continuous focus if supported, otherwise use
         * software auto-focus. Only works for API level >=9.
         */
        /*
        Camera.Parameters parameters = camera.getParameters();
        for (String f : parameters.getSupportedFocusModes()) {
            if (f == Parameters.FOCUS_MODE_CONTINUOUS_PICTURE) {
                mCamera.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
                autoFocusCallback = null;
                break;
            }
        }
        */
 
        // 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);
        } catch (IOException e) {
            Log.d("DBG", "Error setting camera preview: " + e.getMessage());
        }
    }
 
    public void surfaceDestroyed(SurfaceHolder holder) {
        // Camera preview released in activity
    }
 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        /*
         * 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
        }
 
        try {
            // Hard code camera surface rotation 90 degs to match Activity view in portrait
            mCamera.setDisplayOrientation(90);
 
            mCamera.setPreviewDisplay(mHolder);
            mCamera.setPreviewCallback(previewCallback);
            mCamera.startPreview();
            mCamera.autoFocus(autoFocusCallback);
        } catch (Exception e){
            Log.d("DBG", "Error starting camera preview: " + e.getMessage());
        }
    }
}
Ce code est celui du Zbar scanner.

Mon but est de créer une page main2.xml avant celle du main.xml qui contient un bouton scan et en cliquant sur ce bouton, elle nous renvoie directement dans l'activité principale qui est le scan.

Quelqu'un saurait-il m'indiquer comment faire ?

Merci d'avance pour votre aide.