在android上，detector.isOperational（）总是假的 [英] detector.isOperational() always false on android

问题描述

我正在使用新的Google Play服务：条形码检测器，对于这个问题我正在遵循本教程： https://search-codelabs.appspot.com/codelabs/bar-codes

I'm using the new google plays service: Barcode detector, for this porposue I'm following this tutorial : https://search-codelabs.appspot.com/codelabs/bar-codes

但是当我在我的真实设备（华硕Nexus 7）上运行该应用程序时，该应用程序的文本视图始终显示无法设置探测器，我不知道如何制作它工作>< ...

But when I run the application on my real device(Asus Nexus 7), the text view of the app always is showing me "Couldn't set up the detector" and i don't know how to make it work >< ...

这里有一些快速调试的代码：

Here some code for fast debugging:

public class DecoderBar extends Activity implements View.OnClickListener{

private TextView  txt;
private ImageView img;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout_decoder);

    Button b = (Button) findViewById(R.id.button);
    txt = (TextView) findViewById(R.id.txtContent);
    img = (ImageView) findViewById(R.id.imgview);

    b.setOnClickListener(this);
}

// [...]

@Override
public void onClick(View v) {

    Bitmap myBitmap = BitmapFactory.decodeResource(getApplicationContext().getResources(),R.drawable.popi);
    img.setImageBitmap(myBitmap);

    BarcodeDetector detector = new BarcodeDetector.Builder(getApplicationContext())
            .setBarcodeFormats(Barcode.DATA_MATRIX | Barcode.QR_CODE)
            .build();

    if(!detector.isOperational()){
        // Always show this message, so, never is operational!
        txt.setText("Could not set up the detector!");
        return;
    }

    Frame frame = new Frame.Builder().setBitmap(myBitmap).build();
    SparseArray<Barcode> barcodes = detector.detect(frame);

    Barcode thisCode = barcodes.valueAt(0);
    txt.setText(thisCode.rawValue);
}
}

推荐答案

我现在有这个问题。您无法更新Google Play服务。在我使用与教程相同的内容后，它可以工作。

I had this problem now. You can't update the Google Play Services. After I used the same as on the tutorial it works.

编译'com.google.android.gms：play-services：7.8 +'

compile 'com.google.android.gms:play-services:7.8+'

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