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.youkuaiyun.com/qq_28057541/article/details/52034988