Android Zxing 扫描的简单的demo

总体的步骤：

1: 首先导入相关的项目

2: demo是两个activity，从MainActivity跳转到ScanActivity，然后将从ScanActivity里面获取的传给MainActivity

3: 考虑可能需要打开闪光灯，添加一个切换闪光灯的，按钮，并且添加一个闪光灯的判断boolean

1: 需要导入的zxing的相关的

compile 'com.journeyapps:zxing-android-embedded:3.3.0'    compile 'com.google.zxing:core:3.2.1'

2: MainActivity:

import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Toast;import com.google.zxing.integration.android.IntentIntegrator;import com.google.zxing.integration.android.IntentResult;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    /**     * 点击跳转     * 设置方向不锁住     * 跳转的activity     * @param view     */    public void jumpToScan(View view) {        new IntentIntegrator(this)                .setOrientationLocked(false)                .setCaptureActivity(ScanActivity.class)                .initiateScan();    }    /**     * 从返回的信息里面找到扫描到的条码     * @param requestCode     * @param resultCode     * @param data     */    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        //通过IntentIntegrator.parseActivityResult 来获取结果        IntentResult intentResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);        if(intentResult!=null){            //获取扫描到的数据            String contents = intentResult.getContents();            Toast.makeText(this,"扫描到："+contents,Toast.LENGTH_LONG).show();        }    }}

activate_main.xml:

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout    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"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.kodulf.myzxingdemo.MainActivity">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="jumpToScan"        android:onClick="jumpToScan"        app:layout_constraintBottom_toBottomOf="@+id/activity_main"        app:layout_constraintLeft_toLeftOf="@+id/activity_main"        app:layout_constraintRight_toRightOf="@+id/activity_main"        app:layout_constraintTop_toTopOf="@+id/activity_main" /></android.support.constraint.ConstraintLayout>

ScanActivity:

import android.content.pm.PackageManager;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import com.journeyapps.barcodescanner.CaptureManager;import com.journeyapps.barcodescanner.DecoratedBarcodeView;public class ScanActivity extends AppCompatActivity implements DecoratedBarcodeView.TorchListener {    /**     * 截图管理     */    private CaptureManager captureManager;    /**     * 扫描的view     */    private DecoratedBarcodeView barcodeView;    /**     * 当前闪光灯是否打开了     */    private boolean isTorchOn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_scan);        barcodeView = (DecoratedBarcodeView)findViewById(R.id.barcodeView);        barcodeView.setTorchListener(this);        //初始化，并且开始decorde        captureManager = new CaptureManager(this, barcodeView);        captureManager.initializeFromIntent(getIntent(),savedInstanceState);        captureManager.decode();    }    /**     * 这里需要将captureManager也考虑进去     */    @Override    protected void onPause() {        super.onPause();        if(captureManager!=null){            captureManager.onPause();        }    }    /**     * 这里需要将captureManager也考虑进去     */    @Override    protected void onDestroy() {        super.onDestroy();        if(captureManager!=null){            captureManager.onDestroy();        }    }    /**     * 这里需要将captureManager也考虑进去     */    @Override    protected void onResume() {        super.onResume();        if(captureManager!=null){            captureManager.onResume();        }    }    /**     * 这里需要将captureManager也考虑进去     */    @Override    protected void onRestoreInstanceState(Bundle savedInstanceState) {        super.onRestoreInstanceState(savedInstanceState);        if(captureManager!=null){            captureManager.onSaveInstanceState(savedInstanceState);        }    }    @Override    public void onTorchOn() {        isTorchOn = true;    }    @Override    public void onTorchOff() {        isTorchOn = false;    }    /**     * 切换闪光灯     * @param view     */    public void openOrCloseTorch(View view) {        if(isTorchOn){            if(hasTorch())                barcodeView.setTorchOff();        }else{            if(hasTorch())                barcodeView.setTorchOn();        }    }    /**     * 判断是否有闪光灯     * @return     */    public boolean hasTorch(){        return getApplication().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);    }}

activity_scan.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:id="@+id/activity_scan"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.kodulf.ScanActivity"><com.journeyapps.barcodescanner.DecoratedBarcodeView    android:id="@+id/barcodeView"    android:layout_height="match_parent"    android:layout_width="match_parent"    app:zxing_framing_rect_width="200dp"    app:zxing_framing_rect_height="200dp"    app:zxing_preview_scaling_strategy="fitXY"    app:zxing_use_texture_view="true"    android:layout_marginBottom="60dp"    />    <Button        android:layout_alignParentBottom="true"        android:id="@+id/swithTorch"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="切换闪光灯"        android:onClick="openOrCloseTorch"/></RelativeLayout>

参考：http://blog.csdn.net/qq_28057541/article/details/52034988