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android studio 集成zxing二维码，条形码扫描
android studio 集成zxing 扫描器 扫描框、扫描线定制样式
直接上代码。代码说明：
一、添加权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />二、配置app build.gradle
compile 'com.google.zxing:core:3.2.1'
compile 'com.journeyapps:zxing-android-embedded:3.5.0'三、Activity使用
（1）Activity代码
public class SecondActivity extends AppCompatActivity {
CompoundBarcodeView mBarcodeView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
mBarcodeView = (CompoundBarcodeView) findViewById(R.id.dbv_custom);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA},
1);
} else {
// Choose only one!!!这一个是扫描结果只会出来一次
mBarcodeView.decodeSingle(callback);
// Or这一是扫描结果一直会打印出来
//mBarcodeView.decodeContinuous(callback);
}
}
private BarcodeCallback callback = new BarcodeCallback() {
@Override
public void barcodeResult(BarcodeResult result) {
// Do something with the scanned QR code.
// result.getText() returns decoded QR code.
//mBarcodeView.
System.out.println("______________________________"+result.getText());
/* if(!TextUtils.isEmpty(result.getText())){
mBarcodeView.decodeContinuous(null);
}*/
}
@Override
public void possibleResultPoints(List<ResultPoint> resultPoints) {
}
};
@Override
protected void onPause() {
super.onPause();
mBarcodeView.pause();
}
@Override
protected void onResume() {
super.onResume();
mBarcodeView.resume();
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == 1) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Choose only one!!!
mBarcodeView.decodeSingle(callback);
// Or
//mBarcodeView.decodeContinuous(callback);
return;
}
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
（2）activity布局文件代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:gravity="center"
>
<com.journeyapps.barcodescanner.CompoundBarcodeView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/dbv_custom"
app:zxing_scanner_layout="@layout/code_scanning_scanner"
>
</com.journeyapps.barcodescanner.CompoundBarcodeView>
</LinearLayout>
其中重点是 app:zxing_scanner_layout=”@layout/code_scanning_scanner”
code_scanning_scanner控制扫描页面的样式，下面重点解析。
（3）code_scanning_scanner代码
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto">
<com.journeyapps.barcodescanner.BarcodeView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/zxing_barcode_surface"
app:zxing_framing_rect_width="250dp"
app:zxing_framing_rect_height="250dp"
app:qrcv_animTime="1000"
app:qrcv_borderColor="#00000000"
app:qrcv_borderSize="1dp"
app:qrcv_cornerColor="#ffffff"
app:qrcv_cornerLength="20dp"
app:qrcv_cornerSize="3dp"
app:qrcv_maskColor="#33FFFFFF"
app:qrcv_rectWidth="220dp"
app:qrcv_scanLineColor="#ffffff"
app:qrcv_scanLineSize="1dp"
app:qrcv_topOffset="100dp"
/>
<com.ljm.zxing.ScanView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/zxing_viewfinder_view"
app:zxing_possible_result_points="@color/zxing_custom_possible_result_points"
app:zxing_result_view="@color/zxing_custom_result_view"
app:zxing_viewfinder_laser="@color/zxing_custom_viewfinder_laser"
app:zxing_viewfinder_mask="@color/zxing_custom_viewfinder_mask"/>
<TextView
android:id="@+id/zxing_status_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:background="@color/zxing_transparent"
android:text="@string/zxing_msg_default_status"
android:textColor="@color/zxing_status_text"/>
</merge>com.ljm.zxing.ScanView是自定义控件，控制扫描框，扫描线等样式
（4）ScanView代码
package com.ljm.zxing;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import com.journeyapps.barcodescanner.CameraPreview;
import com.journeyapps.barcodescanner.ViewfinderView;
/**
* Created by BettyLi on 2018/3/22.
* 重写ViewfinderView设置扫描框的样式，四个角和扫描线样式
*/
public class ScanView extends ViewfinderView {
protected static final int CURRENT_POINT_OPACITY = 0xA0;
protected Bitmap resultBitmap;
protected final Paint paint;
protected CameraPreview cameraPreview;
protected Rect framingRect;
protected Rect previewFramingRect;
private int i=0;
private int ScreenRate;
/**
* 四个绿色边角对应的宽度
*/
private static final int CORNER_WIDTH = 10;
/**
* 手机的屏幕密度
*/
private static float density;
public ScanView(Context context, AttributeSet attrs) {
super(context, attrs);
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
//四个绿色边角
density = context.getResources().getDisplayMetrics().density;
//将像素转换成dp
ScreenRate = (int)(20 * density);
}
public void setCameraPreview(CameraPreview view) {
this.cameraPreview = view;
view.addStateListener(new CameraPreview.StateListener() {
@Override
public void previewSized() {
refreshSizes();
invalidate();
}
@Override
public void previewStarted() {
}
@Override
public void previewStopped() {
}
@Override
public void cameraError(Exception error) {
}
@Override
public void cameraClosed() {
}
});
}
protected void refreshSizes() {
if(cameraPreview == null) {
return;
}
Rect framingRect = cameraPreview.getFramingRect();
Rect previewFramingRect = cameraPreview.getPreviewFramingRect();
if(framingRect != null && previewFramingRect != null) {
this.framingRect = framingRect;
this.previewFramingRect = previewFramingRect;
}
}
@SuppressLint("DrawAllocation")
@Override
public void onDraw(Canvas canvas) {
refreshSizes();
if (framingRect == null || previewFramingRect == null) {
return;
}
Rect frame = framingRect;
int width = canvas.getWidth();
int height = canvas.getHeight();
paint.setColor(resultBitmap != null ? resultColor : maskColor);
canvas.drawRect(0, 0, width, frame.top, paint);
canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
canvas.drawRect(0, frame.bottom + 1, width, height, paint);
if (resultBitmap != null) {
paint.setAlpha(CURRENT_POINT_OPACITY);
canvas.drawBitmap(resultBitmap, null, frame, paint);
}else{
drawFrameCorner(canvas, frame);
drawLaserLine(canvas, frame);//绘制扫描线
}
}
/**
* 画扫描线
*
* @param canvas
* @param frame
*/
private void drawLaserLine(Canvas canvas, Rect frame) {
if ((i += 5) < frame.bottom - frame.top) {
} else {
i = 0;
}
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.GREEN);// 设置扫描线颜色
canvas.drawRect(frame.left - 1, frame.top + i - 1, frame.right + 1,frame.top + 1 + i, paint);
// 刷新
invalidate();
}
/**
* 绘制扫描框4角
*
* @param canvas
* @param frame
*/
private void drawFrameCorner(Canvas canvas, Rect frame) {
//画扫描框边上的角，总共8个部分
paint.setColor(Color.GREEN);
canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
frame.top + CORNER_WIDTH, paint);
canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top
+ ScreenRate, paint);
canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
frame.top + CORNER_WIDTH, paint);
canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top
+ ScreenRate, paint);
canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left
+ ScreenRate, frame.bottom, paint);
canvas.drawRect(frame.left, frame.bottom - ScreenRate,
frame.left + CORNER_WIDTH, frame.bottom, paint);
canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,
frame.right, frame.bottom, paint);
canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,
frame.right, frame.bottom, paint);
}
public void drawViewfinder() {
Bitmap resultBitmap = this.resultBitmap;
this.resultBitmap = null;
if (resultBitmap != null) {
resultBitmap.recycle();
}
invalidate();
}
public void drawResultBitmap(Bitmap result) {
resultBitmap = result;
invalidate();
}
}