在已有佈局中實施zbar掃描儀

將zbar掃描儀的相機預覽放置到我現有的佈局中，但Im試圖放置它的地方始終保持黑色，並且不會啓動相機讀取qrs。如果我不使用自定義佈局，但是在示例中使用了自定義佈局（它在所有新活動中啓動掃描儀並且佔用所有屏幕尺寸），一切都很好。這意味着我沒有權限或類似的問題。這是我現在使用的代碼：在已有佈局中實施zbar掃描儀

import net.sourceforge.zbar.Config; 
import net.sourceforge.zbar.Image; 
import net.sourceforge.zbar.ImageScanner; 
import net.sourceforge.zbar.Symbol; 
import net.sourceforge.zbar.SymbolSet; 

import com.dm.zbar.android.scanner.CameraPreview; 
import com.dm.zbar.android.scanner.ZBarConstants; 
import com.dm.zbar.android.scanner.ZBarScannerActivity; 

import android.os.Bundle; 
import android.os.Handler; 
import android.app.Activity; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.hardware.Camera; 
import android.text.TextUtils; 
import android.view.Menu; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 
import android.widget.LinearLayout; 
import android.widget.LinearLayout.LayoutParams; 
import android.widget.TextView; 
import android.widget.Toast; 

public class PointGivingActivity extends Activity implements Camera.PreviewCallback, ZBarConstants{ 

    private static final int ZBAR_SCANNER_REQUEST = 0; 
    private static final int ZBAR_QR_SCANNER_REQUEST = 1; 
    private static final String TAG = "ZBarScannerActivity"; 
    private CameraPreview mPreview; 
    private Camera mCamera; 
    private ImageScanner mScanner; 
    private Handler mAutoFocusHandler; 
    private boolean mPreviewing = true; 
    static { 
     System.loadLibrary("iconv"); 
    } 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     if (!isCameraAvailable()) { 
      cancelRequest(); 
      return; 
     } 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     setContentView(R.layout.activity_point_giving2); 
     mAutoFocusHandler = new Handler(); 
     setupScanner(); 


     LinearLayout zbarLayout = (LinearLayout) findViewById(R.id.zbar_layout_area); 

     mPreview = new CameraPreview(zbarLayout.getContext(), this, autoFocusCB); 
     mPreview.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); 
     zbarLayout.addView(mPreview); 
    } 

    public void launchScanner(View v) { 
     if (isCameraAvailable()) { 
      Intent intent = new Intent(this, ZBarScannerActivity.class); 
      startActivityForResult(intent, ZBAR_SCANNER_REQUEST); 
     } else { 
      Toast.makeText(this, "Rear Facing Camera Unavailable", 
        Toast.LENGTH_SHORT).show(); 
     } 
    } 
    public void launchScanner() { 
     if (isCameraAvailable()) { 
      Intent intent = new Intent(this, ZBarScannerActivity.class); 
      startActivityForResult(intent, ZBAR_SCANNER_REQUEST); 
     } else { 
      Toast.makeText(this, "Rear Facing Camera Unavailable", 
        Toast.LENGTH_SHORT).show(); 
     } 
    } 
    public void launchQRScanner(View v) { 
     if (isCameraAvailable()) { 
      Intent intent = new Intent(this, ZBarScannerActivity.class); 
      intent.putExtra(ZBarConstants.SCAN_MODES, 
        new int[] { Symbol.QRCODE }); 
      startActivityForResult(intent, ZBAR_SCANNER_REQUEST); 
     } else { 
      Toast.makeText(this, "Rear Facing Camera Unavailable", 
        Toast.LENGTH_SHORT).show(); 
     } 
    } 

    public void MyMethod(View v) { 
     Intent intent = new Intent(this, ZBarScannerActivity.class); 
     startActivityForResult(intent, ZBAR_SCANNER_REQUEST); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (resultCode == RESULT_OK) { 
      TextView someText = (TextView) findViewById(R.id.givePointtv1); 
      someText.setText(data.getStringExtra(ZBarConstants.SCAN_RESULT)); 
      // Toast.makeText(this, "Scan Result = " + 
      // data.getStringExtra(ZBarConstants.SCAN_RESULT), 
      // Toast.LENGTH_SHORT).show(); 
      // Toast.makeText(this, "Scan Result Type = " + 
      // data.getStringExtra(ZBarConstants.SCAN_RESULT_TYPE), 
      // Toast.LENGTH_SHORT).show(); 

     } else if (resultCode == RESULT_CANCELED) { 
      // Toast.makeText(this, "Camera unavailable", 
      // Toast.LENGTH_SHORT).show(); 
     } 
    } 

    public boolean isCameraAvailable() { 
     PackageManager pm = getPackageManager(); 
     return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA); 
    } 

    public void cancelRequest() { 
     Intent dataIntent = new Intent(); 
     dataIntent.putExtra(ERROR_INFO, "Camera unavailable"); 
     setResult(Activity.RESULT_CANCELED, dataIntent); 
     finish(); 
    } 

    public void onPreviewFrame(byte[] data, Camera camera) { 
     Camera.Parameters parameters = camera.getParameters(); 
     Camera.Size size = parameters.getPreviewSize(); 

     Image barcode = new Image(size.width, size.height, "Y800"); 
     barcode.setData(data); 

     int result = mScanner.scanImage(barcode); 

     if (result != 0) { 
      mCamera.cancelAutoFocus(); 
      mCamera.setPreviewCallback(null); 
      mCamera.stopPreview(); 
      mPreviewing = false; 
      SymbolSet syms = mScanner.getResults(); 
      for (Symbol sym : syms) { 
       String symData = sym.getData(); 
       if (!TextUtils.isEmpty(symData)) { 
        Intent dataIntent = new Intent(); 
        dataIntent.putExtra(SCAN_RESULT, symData); 
        dataIntent.putExtra(SCAN_RESULT_TYPE, sym.getType()); 
        setResult(Activity.RESULT_OK, dataIntent); 
        finish(); 
        break; 
       } 
      } 
     } 
    } 
    private Runnable doAutoFocus = new Runnable() { 
     public void run() { 
      if(mCamera != null && mPreviewing) { 
       mCamera.autoFocus(autoFocusCB); 
      } 
     } 
    }; 

    // Mimic continuous auto-focusing 
    Camera.AutoFocusCallback autoFocusCB = new Camera.AutoFocusCallback() { 
     public void onAutoFocus(boolean success, Camera camera) { 
      mAutoFocusHandler.postDelayed(doAutoFocus, 1000); 
     } 
    }; 
    public void setupScanner() { 
     mScanner = new ImageScanner(); 
     mScanner.setConfig(0, Config.X_DENSITY, 3); 
     mScanner.setConfig(0, Config.Y_DENSITY, 3); 

     int[] symbols = getIntent().getIntArrayExtra(SCAN_MODES); 
     if (symbols != null) { 
      mScanner.setConfig(Symbol.NONE, Config.ENABLE, 0); 
      for (int symbol : symbols) { 
       mScanner.setConfig(symbol, Config.ENABLE, 1); 
      } 
     } 
    } 
}

Im相當肯定的問題是在這裏某處：

LinearLayout zbarLayout = (LinearLayout) findViewById(R.id.zbar_layout_area); 

mPreview = new CameraPreview(zbarLayout.getContext(), this, autoFocusCB); 
mPreview.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); 
zbarLayout.addView(mPreview);

，但無法弄清楚如何使它工作，我想要的方式。

這裏是我的xml文件，如果是需要

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/pointgivingll1" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:background="#f1f1f1" 
    android:orientation="vertical" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:weightSum="10" > 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:orientation="horizontal" 
     android:weightSum="8" > 

     <Button 
      android:id="@+id/givePointMenuBut" 
      android:layout_width="0dp" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:visibility="invisible" /> 

     <TextView 
      android:id="@+id/givePointtv1" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" 
      android:layout_weight="6" 
      android:gravity="center" 
      android:text="@string/pointGiving" 
      android:textColor="@android:color/black" 
      android:textSize="22sp" /> 

     <Button 
      android:id="@+id/givePointMenuBut" 
      android:layout_width="wrap_content" 
      android:layout_height="match_parent" 
      android:layout_marginBottom="10dp" 
      android:layout_marginTop="10dp" 
      android:layout_weight="1" 
      android:gravity="center" 
      android:text="@string/ruchno" 
      android:textSize="10sp" /> 
    </LinearLayout> 

    <LinearLayout 
     android:gravity="center" 
     android:layout_weight="9" 
     android:id="@+id/zbar_layout_area" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:orientation="vertical" > 
    </LinearLayout> 


</LinearLayout>

來源

2013-08-19 Boris Pawlowski

我面臨着同樣的問題，並通過添加/刪除程序意見向FrameLayout裏做了一些竅門。我發現這裏該解決方案：

Customize Camera View for Android using zbar

這裏是我的activity_qr_code_reader.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:background="@android:color/black" > 

    <FrameLayout 
     android:id="@+id/flytCamera" 
     android:layout_width="match_parent" 
     android:layout_height="0dip" 
     android:layout_weight="1" > 

     <ImageView 
      android:id="@+id/ivScanner" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_gravity="center" 
      android:src="@drawable/im_qr_scan"/> 

    </FrameLayout> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_gravity="bottom" 
     android:padding="10dp" 
     android:textColor="@android:color/white" 
     android:textSize="16sp" 
     android:background="@color/transparent_black" 
     android:text="@string/qr_code_reading"/> 
</LinearLayout>

到目前爲止，我已經在底部的信息文本視圖和QR碼讀取幀圖像（只4個白色的角落）。我想把相機預覽放在整個FrameLayout中，但最終只把它放在中央。這是代碼。它並不完美，但至少更加用戶友好。

public class QRCodeReaderActivity extends ZBarScannerActivity { 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.layout_qr_code_reader); 
     FrameLayout flytCamera = (FrameLayout)  findViewById(R.id.flytCamera); 
     ImageView ivScanner = (ImageView) findViewById(R.id.ivScanner); 

     flytCamera.addView(mPreview); 
     flytCamera.removeView(ivScanner); 
     flytCamera.addView(ivScanner); 
    } 
}

順便說一句，我想我的ZBarScanner是肖像，所以我也迫使相機旋轉90度。 http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)

@Override 
    protected void onResume() { 
     super.onResume(); 
     setCameraDisplayOrientation(this, Camera.CameraInfo.CAMERA_FACING_BACK, mCamera); 
    } 

    public static void setCameraDisplayOrientation(Activity activity, 
                int cameraId, android.hardware.Camera camera) { 
     android.hardware.Camera.CameraInfo info = 
       new android.hardware.Camera.CameraInfo(); 
     android.hardware.Camera.getCameraInfo(cameraId, info); 
     int rotation = activity.getWindowManager().getDefaultDisplay() 
       .getRotation(); 
     int degrees = 0; 
     switch (rotation) { 
      case Surface.ROTATION_0: degrees = 0; break; 
      case Surface.ROTATION_90: degrees = 90; break; 
      case Surface.ROTATION_180: degrees = 180; break; 
      case Surface.ROTATION_270: degrees = 270; break; 
     } 

     int result; 
     if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { 
      result = (info.orientation + degrees) % 360; 
      result = (360 - result) % 360; // compensate the mirror 
     } else { // back-facing 
      result = (info.orientation - degrees + 360) % 360; 
     } 
     camera.setDisplayOrientation(result); 
    }

來源

2015-02-03 21:16:05

你知道如何來調整存儲箱掃描區域？ –

在已有佈局中實施zbar掃描儀

回答

相關問題