[android]QR code掃描

今天一時興起就來寫個code
IDE是使用Android Studio

首先呢~先來介紹今天的主角 zxing~~
zxing 是zebra crossing 的縮寫
是開源的 一維、二維條碼辨識的library

首先  這是介面布局

一個Button 兩個TextView

然後遇到第一個問題  如何在Android Studio中加入library??

上網參考了stack overflow的解答

http://stackoverflow.com/questions/27851512/how-to-integrate-zxing-library-to-android-studio-for-barcode-scanning

只要在build.gradle中加入這幾行就OK了

repositories {
    mavenCentral()
 
    maven {
        url "http://dl.bintray.com/journeyapps/maven"
    }
}
 
dependencies {
    // Supports Android 4.0.3 and later (API level 15)
    compile 'com.journeyapps:zxing-android-embedded:2.0.1@aar'
 
    // Supports Android 2.1 and later (API level 7), but not optimal for later Android versions.
    // If you only plan on supporting Android 4.0.3 and up, you don't need to include this.
    compile 'com.journeyapps:zxing-android-legacy:2.0.1@aar'
 
    // Convenience library to launch the scanning and encoding Activities.
    // It automatically picks the best scanning library from the above two, depending on the
    // Android version and what is available.
    compile 'com.journeyapps:zxing-android-integration:2.0.1@aar'
 
    // Version 3.0.x of zxing core contains some code that is not compatible on Android 2.2 and earlier.
    // This mostly affects encoding, but you should test if you plan to support these versions.
    // Older versions e.g. 2.2 may also work if you need support for older Android versions.
    compile 'com.google.zxing:core:3.0.1'
}

阿阿阿阿~~ 還沒搞懂gradle 所以我沒辦法解釋這些東西
我只知道他是去下載然後build zxing((大概是八=..=
接下來來寫activity

package com.catstudio.scanme;

import android.app.Activity;
import com.google.zxing.integration.android.*;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Created by cat on 2015/3/30.
 */
public class MainActivity extends Activity{

    private Activity mainactivity;
    private TextView scan_content;
    private TextView scan_format;
    private Button scan_btn;
    protected void onCreate(Bundle saveInstanceStat){
        super.onCreate(saveInstanceStat);
        setContentView(R.layout.main_layout);
        init_view();
        scan_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                IntentIntegrator scanIntegrator = new IntentIntegrator(mainactivity);
                scanIntegrator.initiateScan();
            }
        });
    }
    public void onActivityResult(int requestCode, int resultCode, Intent intent){
        IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
        if(scanningResult!=null){
            String scanContent=scanningResult.getContents();
            String scanFormat=scanningResult.getFormatName();
            scan_content.setText(scanContent);
            scan_format.setText(scanFormat);
        }else{
            Toast.makeText(getApplicationContext(),"nothing",Toast.LENGTH_SHORT).show();
        }
    }
    private void init_view(){
        this.scan_content=(TextView)findViewById(R.id.scan_content);
        this.scan_format=(TextView)findViewById(R.id.scan_format);
        this.mainactivity=this;
        this.scan_btn = (Button)findViewById(R.id.scan_btn);
    }
}

當點擊Button就可以用IntentIntegration的initiateScan方法開始掃描
掃描完的結果會回傳到Activity  這時候要用onActivityResult  這個方法
然後就簡單了   把data顯示到TextView就OK了

附上幾張完成圖