watashiyoga / simplescan Goto Github PK

What steps will reproduce the problem?
1. Run app without the barcode scanner installed
2. Attempt a scan
3.

What is the expected output? What do you see instead?
Expect a message saying scanner not installed. Usual practice is then to offer 
to install it.

What version of the product are you using? On what operating system?
V0.31
Target was Nexus One Android 2.2.2

Please provide any additional information below.

Here's a fix. In SimpleScanActivity.java change the OnClickListener method, 
then add the isIntentAvailable() method as follows:

/**
 * A call-back for when the user presses the back button.
 */
OnClickListener mScanListener = new OnClickListener() {
  public void onClick(View v) {

    Intent intent = new Intent("com.google.zxing.client.android.SCAN");
    intent.putExtra("com.google.zxing.client.android.SCAN.SCAN_MODE","ONE_D_MODE");
    if (isIntentAvailable(SimpleScanActivity.this, "com.google.zxing.client.android.SCAN")) {            
      startActivityForResult(intent, 0);
    } else {
      Dialog confirmScannerInstall = new AlertDialog.Builder( SimpleScanActivity.this )
        .setIcon( R.drawable.icon )
        .setTitle( getString( R.string.app_name ) )
        .setMessage( "The Barcode reader is not present - install it now?")
        .setPositiveButton( "Yes", new DialogInterface.OnClickListener() {
          public void onClick( DialogInterface dialog, int whichButton ) {
            Uri uri = Uri.parse("market://search?q=pname:com.google.zxing.client.android");                        
            Intent installIntent = new Intent(Intent.ACTION_VIEW, uri);
            startActivity(installIntent);
          }
        })
        .setNeutralButton("No" , new DialogInterface.OnClickListener() {
          public void onClick( DialogInterface dialog, int whichButton ) {
            return;
          }
        })                
        .create();
      confirmScannerInstall.show();
    }
  }
};

public static boolean isIntentAvailable(Context context, String action) {
  final PackageManager packageManager = context.getPackageManager();
  final Intent intent = new Intent(action);
  List<ResolveInfo> list =
    packageManager.queryIntentActivities(intent,
    PackageManager.MATCH_DEFAULT_ONLY);
  return list.size() > 0;
}