我有一个github项目使用Zxing Library扫描QR码，但不知为何我也无法获得Scanned Image和QR码。这是我的代码。在gradle中，我正在使用:
build.gradle
compile 'me.dm7.barcodescanner:core:1.9'
compile 'com.google.zxing:core:3.2.1'
您可以在下面查看我的 Activity 和xml代码。
ScanQR_Code_Activity.java
package com.rishi.myaadhaar.activities;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.ViewGroup;
import android.widget.Toast;
import com.google.zxing.Result;
import com.myadhaar.R;
import java.util.ArrayList;
public class ScanQR_Code_Activity extends AppCompatActivity implements ZXingScannerView.ResultHandler {
private static final String FLASH_STATE = "FLASH_STATE";
// UI Elements
private static final String AUTO_FOCUS_STATE = "AUTO_FOCUS_STATE";
private static final String SELECTED_FORMATS = "SELECTED_FORMATS";
private static final String CAMERA_ID = "CAMERA_ID";
String uid, name, gender, yearOfBirth, careOf, villageTehsil, postOffice, house, street, loc, district, state, postCode, lm;
ViewGroup contentFrame;
private ZXingScannerView mScannerView;
private boolean mFlash;
private boolean mAutoFocus;
private ArrayList<Integer> mSelectedIndices;
private int mCameraId = -1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan_qr_code);
if (savedInstanceState != null) {
mFlash = savedInstanceState.getBoolean(FLASH_STATE, false);
mAutoFocus = savedInstanceState.getBoolean(AUTO_FOCUS_STATE, true);
mSelectedIndices = savedInstanceState.getIntegerArrayList(SELECTED_FORMATS);
mCameraId = savedInstanceState.getInt(CAMERA_ID, -1);
} else {
mFlash = false;
mAutoFocus = true;
mSelectedIndices = null;
mCameraId = -1;
}
contentFrame = (ViewGroup) findViewById(R.id.content_frame);
mScannerView = new ZXingScannerView(this);
contentFrame.addView(mScannerView);
}
@Override
public void onResume() {
super.onResume();
mScannerView.setResultHandler(this);
mScannerView.startCamera();
mScannerView.setFlash(mFlash);
mScannerView.setAutoFocus(mAutoFocus);
}
@Override
public void onPause() {
super.onPause();
mScannerView.stopCamera();
}
@Override
public void handleResult(Result rawResult) {
Toast.makeText(this, "Contents = " + rawResult.getText() +
", Format = " + rawResult.getBarcodeFormat().toString(), Toast.LENGTH_SHORT).show();
if (rawResult != null && !rawResult.getText().toString().isEmpty()) {
//processScannedData(rawResult.getText());
} else {
Toast toast = Toast.makeText(getApplicationContext(), "Scan Cancelled", Toast.LENGTH_SHORT);
toast.show();
}
// Note:
// * Wait 2 seconds to resume the preview.
// * On older devices continuously stopping and resuming camera preview can result in freezing the app.
// * I don't know why this is the case but I don't have the time to figure out.
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
mScannerView.resumeCameraPreview(ScanQR_Code_Activity.this);
}
}, 2000);
}
}
activity_scan_qr_code.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_scan_qr_code"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.rishi.myaadhaar.activities.ScanQR_Code_Activity">
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
扩展了类
public class ZXingScannerView extends BarcodeScannerView {
private static final String TAG = "ZXingScannerView";
public interface ResultHandler {
public void handleResult(Result rawResult);
}
private MultiFormatReader mMultiFormatReader;
public static final List<BarcodeFormat> ALL_FORMATS = new ArrayList<BarcodeFormat>();
private List<BarcodeFormat> mFormats;
private ResultHandler mResultHandler;
static {
ALL_FORMATS.add(BarcodeFormat.UPC_A);
ALL_FORMATS.add(BarcodeFormat.UPC_E);
ALL_FORMATS.add(BarcodeFormat.EAN_13);
ALL_FORMATS.add(BarcodeFormat.EAN_8);
ALL_FORMATS.add(BarcodeFormat.RSS_14);
ALL_FORMATS.add(BarcodeFormat.CODE_39);
ALL_FORMATS.add(BarcodeFormat.CODE_93);
ALL_FORMATS.add(BarcodeFormat.CODE_128);
ALL_FORMATS.add(BarcodeFormat.ITF);
ALL_FORMATS.add(BarcodeFormat.CODABAR);
ALL_FORMATS.add(BarcodeFormat.QR_CODE);
ALL_FORMATS.add(BarcodeFormat.DATA_MATRIX);
ALL_FORMATS.add(BarcodeFormat.PDF_417);
}
public ZXingScannerView(Context context) {
super(context);
initMultiFormatReader();
}
public ZXingScannerView(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
initMultiFormatReader();
}
public void setFormats(List<BarcodeFormat> formats) {
mFormats = formats;
initMultiFormatReader();
}
public void setResultHandler(ResultHandler resultHandler) {
mResultHandler = resultHandler;
}
public Collection<BarcodeFormat> getFormats() {
if(mFormats == null) {
return ALL_FORMATS;
}
return mFormats;
}
private void initMultiFormatReader() {
Map<DecodeHintType,Object> hints = new EnumMap<DecodeHintType,Object>(DecodeHintType.class);
hints.put(DecodeHintType.POSSIBLE_FORMATS, getFormats());
mMultiFormatReader = new MultiFormatReader();
mMultiFormatReader.setHints(hints);
}
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
if(mResultHandler == null) {
return;
}
try {
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = parameters.getPreviewSize();
int width = size.width;
int height = size.height;
if (DisplayUtils.getScreenOrientation(getContext()) == Configuration.ORIENTATION_PORTRAIT) {
byte[] rotatedData = new byte[data.length];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++)
rotatedData[x * height + height - y - 1] = data[x + y * width];
}
int tmp = width;
width = height;
height = tmp;
data = rotatedData;
}
Result rawResult = null;
PlanarYUVLuminanceSource source = buildLuminanceSource(data, width, height);
if (source != null)
{
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
rawResult = mMultiFormatReader.decodeWithState(bitmap);
} catch (ReaderException re) {
// continue
} catch (NullPointerException npe) {
// This is terrible
} catch (ArrayIndexOutOfBoundsException aoe) {
} finally
{
mMultiFormatReader.reset();
}
}
final Result finalRawResult = rawResult;
if (finalRawResult != null) {
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
@Override
public void run() {
// Stopping the preview can take a little long.
// So we want to set result handler to null to discard subsequent calls to
// onPreviewFrame.
ResultHandler tmpResultHandler = mResultHandler;
mResultHandler = null;
stopCameraPreview();
if (tmpResultHandler != null) {
tmpResultHandler.handleResult(finalRawResult);
}
}
});
} else {
camera.setOneShotPreviewCallback(this);
}
} catch(RuntimeException e) {
// TODO: Terrible hack. It is possible that this method is invoked after camera is released.
Log.e(TAG, e.toString(), e);
}
}
public void resumeCameraPreview(ResultHandler resultHandler) {
mResultHandler = resultHandler;
super.resumeCameraPreview();
}
public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {
Rect rect = getFramingRectInPreview(width, height);
if (rect == null)
{
return null;
}
// Go ahead and assume it's YUV rather than die.
PlanarYUVLuminanceSource source = null;
try
{
source = new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height(), false);
}
catch(Exception e)
{
}
return source;
}
}
最佳答案
像这样从handleResult()方法调用generateQRCode()方法
@Override
public void handleResult(Result rawResult) {
generateQRCode(rawResult.getResultMetadata().toString());
}
public void generateQRCode(String data){
com.google.zxing.Writer wr = new MultiFormatWriter();
try {
int width = 350;
int height = 350;
BitMatrix bm = wr.encode(data, BarcodeFormat.QR_CODE, width, height);
mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
mBitmap.setPixel(i, j, bm.get(i, j) ? Color.BLACK : Color.WHITE);
}
}
} catch (WriterException e) {
e.printStackTrace();
}
if (mBitmap != null) {
img.setImageBitmap(mBitmap);
}
}
关于android - 如何使用Zxing Library获取扫描的图片和QR码，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/43164998/