zxing code_128
时间: 2023-09-27 15:06:48 浏览: 44
ZXing 是一个开源的条形码和二维码扫描库,可以识别多种类型的条形码和二维码。其中,Code 128 是一种高密度的线性条码,广泛应用于物流和仓储等领域。
使用 ZXing 实现 Code 128 的扫描和解码,可以参考以下代码:
1. 添加依赖
在项目的 build.gradle 文件中添加以下依赖:
```
dependencies {
implementation 'com.google.zxing:core:3.4.1'
implementation 'com.journeyapps:zxing-android-embedded:3.6.0'
}
```
2. 创建扫描界面
在布局文件中添加一个 SurfaceView 和一个 TextView,用于预览摄像头和显示扫描结果:
```
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:id="@+id/surface_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView
android:id="@+id/result_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:textColor="@android:color/white" />
</RelativeLayout>
```
3. 实现扫描逻辑
在 Activity 或 Fragment 中实现扫描逻辑,首先需要初始化扫描器和解码器,并设置回调函数:
```
private SurfaceView surfaceView;
private TextView resultText;
private CaptureManager captureManager;
private DecodeThread decodeThread;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan);
surfaceView = findViewById(R.id.surface_view);
resultText = findViewById(R.id.result_text);
// 初始化扫描器和解码器
captureManager = new CaptureManager(this, surfaceView);
decodeThread = new DecodeThread(new MultiFormatReader(), new DecodeCallback());
// 设置回调函数
captureManager.setCameraCallback(new CameraCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
decodeThread.decode(data, camera);
}
@Override
public void onCameraClosed() {
decodeThread.stop();
}
});
}
@Override
protected void onResume() {
super.onResume();
captureManager.onResume();
}
@Override
protected void onPause() {
super.onPause();
captureManager.onPause();
}
@Override
protected void onDestroy() {
super.onDestroy();
captureManager.onDestroy();
}
private class DecodeCallback implements ResultCallback {
@Override
public void onDecodeSuccess(Result result) {
// 解码成功,显示扫描结果
resultText.setText(result.getText());
}
@Override
public void onDecodeFailed() {
// 解码失败,继续扫描
captureManager.requestPreviewFrame();
}
}
```
4. 实现解码器
创建一个 DecodeThread 类,用于在后台线程中进行解码操作。在 run 方法中,循环调用 decodeWithState 方法,直到解码成功或者停止线程:
```
public class DecodeThread extends HandlerThread {
private final Reader reader;
private final ResultCallback callback;
private Handler handler;
public DecodeThread(Reader reader, ResultCallback callback) {
super("DecodeThread");
this.reader = reader;
this.callback = callback;
}
@Override
protected void onLooperPrepared() {
handler = new Handler(getLooper());
}
public void decode(byte[] data, Camera camera) {
handler.post(() -> {
Rect rect = getFramingRectInPreview(camera);
PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(data,
camera.getParameters().getPreviewSize().width,
camera.getParameters().getPreviewSize().height,
rect.left, rect.top, rect.width(), rect.height(), false);
Result result = decodeWithState(new BinaryBitmap(new HybridBinarizer(source)));
if (result != null) {
callback.onDecodeSuccess(result);
} else {
callback.onDecodeFailed();
}
});
}
public void stop() {
handler.removeCallbacksAndMessages(null);
quit();
}
private Result decodeWithState(BinaryBitmap bitmap) {
try {
return reader.decode(bitmap);
} catch (NotFoundException | ChecksumException | FormatException e) {
e.printStackTrace();
}
return null;
}
private Rect getFramingRectInPreview(Camera camera) {
Rect framingRect = new Rect(0, 0, camera.getParameters().getPreviewSize().width,
camera.getParameters().getPreviewSize().height);
return framingRect;
}
}
```
5. 运行程序
运行程序后,即可使用相机扫描 Code 128 条码,并将扫描结果显示在 TextView 中。