Android——实现二维码扫描

雨点打透心脏的1/2处 2022-06-06 09:36 388阅读 0赞

**首先在build.gradle添加依赖**

compile 'com.journeyapps:zxing-android-embedded:3.3.0'

然后在项目清单中添加权限

<uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.FLASHLIGHT" />

MainActivity.java

package com.bawei.com.myapplication;
    
    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;
    
    import com.google.zxing.integration.android.IntentIntegrator;
    import com.google.zxing.integration.android.IntentResult;
    
    public class MainActivity extends AppCompatActivity {
    
        private Button btnClick;
        private TextView tvResult;
    
        @Override protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            initView();
            initEvent();
        }
        private void initView() {
            btnClick = (Button) findViewById(R.id.btn_click);
            tvResult = (TextView) findViewById(R.id.tv_result);
        }
    
    
        private void initEvent() {
            btnClick.setOnClickListener(new View.OnClickListener() {
                @Override public void onClick(View v) {
                    //假如你要用的是fragment进行界面的跳转 //IntentIntegrator intentIntegrator = IntentIntegrator.forSupportFragment(ShopFragment.this).setCaptureActivity(CustomScanAct.class); IntentIntegrator intentIntegrator = new IntentIntegrator(MainActivity.this);
                    intentIntegrator
                            .setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES)
                            .setPrompt("将二维码/条码放入框内，即可自动扫描")//写那句提示的话 .setOrientationLocked(false)//扫描方向固定 .setCaptureActivity(CustomScanAct.class) // 设置自定义的activity是CustomActivity .initiateScan(); // 初始化扫描 }
            });
        }
    
    
        //获取扫描的结果 @Override public void onActivityResult(int requestCode, int resultCode, Intent data) {
            IntentResult intentResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
            if (intentResult != null) {
                if (intentResult.getContents() == null) {
    
    
                } else {
                    // ScanResult 为获取到的字符串 String ScanResult = intentResult.getContents();
                    tvResult.setText(ScanResult);
                }
            } else {
                super.onActivityResult(requestCode, resultCode, data);
            }
        }
    }

CustomViewfinderView.java

public class CustomViewfinderView extends ViewfinderView {
        public int laserLinePosition=0;
        public float[] position=new float[]{
       0f,0.5f,1f};
        public int[] colors=new int[]{
       0x00ffffff,0xffffffff,0x00ffffff};
        public LinearGradient linearGradient ;
        public CustomViewfinderView(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
    
    
    
    
        /** * 重写draw方法绘制自己的扫描框 * @param canvas */ @Override public void onDraw(Canvas canvas) {
            refreshSizes();
            if (framingRect == null || previewFramingRect == null) {
                return;
            }
    
    
            Rect frame = framingRect;
            Rect previewFrame = previewFramingRect;
    
    
            int width = canvas.getWidth();
            int height = canvas.getHeight();
            //绘制4个角 paint.setColor(0xFFFFFFFF);//定义画笔的颜色 canvas.drawRect(frame.left, frame.top, frame.left+70, frame.top+10, paint);
            canvas.drawRect(frame.left, frame.top, frame.left + 10, frame.top + 70, paint);
    
    
            canvas.drawRect(frame.right-70, frame.top, frame.right, frame.top+10, paint);
            canvas.drawRect(frame.right-10, frame.top, frame.right, frame.top+70, paint);
    
    
            canvas.drawRect(frame.left, frame.bottom-10, frame.left+70, frame.bottom, paint);
            canvas.drawRect(frame.left, frame.bottom-70, frame.left+10, frame.bottom, paint);
    
    
            canvas.drawRect(frame.right-70, frame.bottom-10, frame.right, frame.bottom, paint);
            canvas.drawRect(frame.right-10, frame.bottom-70, frame.right, frame.bottom, paint);
            // Draw the exterior (i.e. outside the framing rect) darkened 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) {
                // Draw the opaque result bitmap over the scanning rectangle paint.setAlpha(CURRENT_POINT_OPACITY);
                canvas.drawBitmap(resultBitmap, null, frame, paint);
            } else {
                // paint.setAlpha(SCANNER_ALPHA[scannerAlpha]); // scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length; int middle = frame.height() / 2 + frame.top;
                laserLinePosition=laserLinePosition+5;
                if(laserLinePosition>frame.height())
                {
                    laserLinePosition=0;
                }
                linearGradient= new LinearGradient(frame.left + 1, frame.top+laserLinePosition , frame.right -1 , frame.top +10+laserLinePosition, colors, position, Shader.TileMode.CLAMP);
                // Draw a red "laser scanner" line through the middle to show decoding is active // paint.setColor(laserColor); paint.setShader(linearGradient);
                //绘制扫描线 canvas.drawRect(frame.left + 1, frame.top+laserLinePosition , frame.right -1 , frame.top +10+laserLinePosition, paint);
                paint.setShader(null);
                float scaleX = frame.width() / (float) previewFrame.width();
                float scaleY = frame.height() / (float) previewFrame.height();
    
    
                List<ResultPoint> currentPossible = possibleResultPoints;
                List<ResultPoint> currentLast = lastPossibleResultPoints;
                int frameLeft = frame.left;
                int frameTop = frame.top;
                if (currentPossible.isEmpty()) {
                    lastPossibleResultPoints = null;
                } else {
                    possibleResultPoints = new ArrayList<>(5);
                    lastPossibleResultPoints = currentPossible;
                    paint.setAlpha(CURRENT_POINT_OPACITY);
                    paint.setColor(resultPointColor);
                    for (ResultPoint point : currentPossible) {
                        canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX),
                                frameTop + (int) (point.getY() * scaleY),
                                POINT_SIZE, paint);
                    }
                }
                if (currentLast != null) {
                    paint.setAlpha(CURRENT_POINT_OPACITY / 2);
                    paint.setColor(resultPointColor);
                    float radius = POINT_SIZE / 2.0f;
                    for (ResultPoint point : currentLast) {
                        canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX),
                                frameTop + (int) (point.getY() * scaleY),
                                radius, paint);
                    }
                }
                postInvalidateDelayed(16,
                        frame.left ,
                        frame.top ,
                        frame.right ,
                        frame.bottom);
                // postInvalidate(); }
        }
    }

CustomScanAct.java

package com.bawei.com.myapplication;
    
    import android.app.Activity;
    import android.content.pm.PackageManager;
    import android.os.Bundle;
    import android.os.PersistableBundle;
    import android.view.KeyEvent;
    import android.view.View;
    import android.widget.Button;
    import android.widget.Toast;
    
    import com.journeyapps.barcodescanner.CaptureManager;
    import com.journeyapps.barcodescanner.DecoratedBarcodeView;
    
    /** * Created by Wangrx on 2017/11/5. */ public class CustomScanAct extends Activity implements DecoratedBarcodeView.TorchListener { // 实现相关接口 // 添加一个按钮用来控制闪光灯，同时添加两个按钮表示其他功能，先用Toast表示 Button swichLight;
        DecoratedBarcodeView mDBV;
        private CaptureManager captureManager;
        private boolean isLightOn = false;
        private Button btn_black;
    
    
        @Override protected void onPause() {
            super.onPause();
            captureManager.onPause();
        }
    
    
        @Override protected void onResume() {
            super.onResume();
            captureManager.onResume();
        }
    
    
        @Override protected void onDestroy() {
            super.onDestroy();
            captureManager.onDestroy();
        }
    
    
        @Override public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
            super.onSaveInstanceState(outState, outPersistentState);
            captureManager.onSaveInstanceState(outState);
        }
    
    
        @Override public boolean onKeyDown(int keyCode, KeyEvent event) {
            return mDBV.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
        }
    
    
        @Override protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.act_customscan);
            swichLight = (Button) findViewById(R.id.btn_switch);
            btn_black = findViewById(R.id.btn_black);
            mDBV= (DecoratedBarcodeView) findViewById(R.id.dbv_custom);
    
    
            mDBV.setTorchListener(this);
            btn_black.setOnClickListener(new View.OnClickListener() {
                @Override public void onClick(View view) {
                    finish();
                }
            });
    
            // 如果没有闪光灯功能，就去掉相关按钮 if (!hasFlash()) {
                swichLight.setVisibility(View.GONE);
            }
            //重要代码，初始化捕获 captureManager = new CaptureManager(this, mDBV);
            captureManager.initializeFromIntent(getIntent(), savedInstanceState);
            captureManager.decode();
            //选择闪关灯 swichLight.setOnClickListener(new View.OnClickListener() {
                @Override public void onClick(View v) {
                    if (isLightOn) {
                        mDBV.setTorchOff();
                    } else {
                        mDBV.setTorchOn();
                    }
                }
            });
        }
    
        // torch 手电筒 @Override public void onTorchOn() {
            Toast.makeText(this, "torch on", Toast.LENGTH_LONG).show();
            isLightOn = true;
        }
    
    
        @Override public void onTorchOff() {
            Toast.makeText(this, "torch off", Toast.LENGTH_LONG).show();
            isLightOn = false;
        }
    
        // 判断是否有闪光灯功能 private boolean hasFlash() {
            return getApplicationContext().getPackageManager()
                    .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
        }
    
    }

activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
        android:layout_height="match_parent" tools:context="com.bawei.com.myapplication.MainActivity">
    
        <Button android:id="@+id/btn_click"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="打开二维码"
            />
        <TextView android:id="@+id/tv_result"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/btn_click"/>
    
    </RelativeLayout>

act\_customscan.xml

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_width="match_parent"
        android:layout_height="match_parent">
        <LinearLayout android:id="@+id/lin"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:orientation="horizontal">
    
            <Button android:id="@+id/btn_black"
                android:layout_width="0dp"
                android:layout_alignParentBottom="true"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="返回"
                />
            <Button android:id="@+id/btn_switch"
                android:layout_width="0dp"
                android:layout_alignParentBottom="true"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="打开闪光灯"
                />
        </LinearLayout>
        <com.journeyapps.barcodescanner.DecoratedBarcodeView android:id="@+id/dbv_custom"
            android:layout_width="match_parent"
            android:layout_below="@+id/lin"
            android:layout_alignParentBottom="true"
            android:layout_height="match_parent"></com.journeyapps.barcodescanner.DecoratedBarcodeView>
    </RelativeLayout>