android - Integrate ZXing QR code scanner without installing BarCode Scanner

Question

I am trying to Integrate ZXing QR Code into my android app without installing BarCode Scanner app, I have followed the steps as:

1) Firstly I have downloaded ZXing.zip file and extract it

2)open the ZXing project as an android existing project and then go to android folder and open the android folder and also include core.jar file into the ZXing project named CaptureActivity.

3)I have used the CaptureActivity project as a library in my project named 'QRCodeSample'. (Problem in including CaptureActivity as a library)

4)My code is as below3:

   public class QRCodeSampleActivity extends Activity {
Button b1;
static String contents;

public static final int REQUEST_CODE = 1;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    b1 = (Button) findViewById(R.id.button1);
    b1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            /*Intent intent = new Intent("com.google.zxing.client.android.SCAN");
            intent.putExtra("com.google.zxing.client.android.SCAN.SCAN_MODE",
                    "QR_CODE_MODE");
            startActivityForResult(intent, 0);*/
            Intent intent = new Intent("com.google.zxing.client.android.SCAN");
            intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
            startActivityForResult(intent, 0);


        }
    });
}

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {
        if (resultCode == RESULT_OK) {
            contents = intent.getStringExtra("SCAN_RESULT");
            String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
            Log.i("Barcode Result", contents);
            Intent i1 = new Intent(QRCodeSampleActivity.this, webclass.class);
            startActivity(i1);
            // Handle successful scan
        } else if (resultCode == RESULT_CANCELED) {
            // Handle cancel
            Log.i("Barcode Result","Result canceled");
        }
    }
}

 }

The manifest file is :

<uses-permission android:name="android.permission.CAMERA"/>

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >

     <activity android:name="com.google.zxing.client.android.CaptureActivity"
           android:screenOrientation="landscape"
           android:configChanges="orientation|keyboardHidden"
           android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
           android:windowSoftInputMode="stateAlwaysHidden">
           <intent-filter>
              <action android:name="android.intent.action.MAIN"/>
              <category android:name="android.intent.category.DEFAULT"/>
           </intent-filter>
           <intent-filter>
              <action android:name="com.google.zxing.client.android.SCAN"/>
              <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>


    </activity>
    <activity
        android:label="@string/app_name"
        android:name=".QRCodeSampleActivity" >
       <intent-filter >
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

    </activity>


    <activity  android:name=".webclass"></activity>

</application>

</manifest>

and its not adding library also

When I am trying to run my project,the error msg is:

Unable to instantiate activity ComponentInfo{com.qr.code/com.qr.code}: java.lang.ClassNotFoundException: com.qr.code in loader dalvik.system.PathClassLoader[/data/app/com.qr.code-1.apk]

Answer 1

Finally I got the answer,

As of ADT 14,the resource fields(such as R.id.decode) are no longer constants when defined in library projects

So in the ZXing library->android->com.google.zxing.client.android.CaptureActivityHandler.java and DecodeHandler.java

Replace both of these classes switch case statements with if-else,and then import this ZXing library into your project..

Rest of the coding of my own project is same...just the problem with the library classes as these are not updated as according to ADT 14..

Kanika