Android二维码扫描功能的集成开发

二维码开发主要依赖ZXing开源项目

项目地址:https://github.com/zxing/zxing

这个开源项目可以扫描一维，和二维码，

一维码指的是书后面的条形码

首先配置ZXing库和Android工程

项目本身非常大，我们只需使用精简版的库

导入之后

TestQRcode 项目作为库被其他项目使用。

BarCodeTestActivity

package com.ericssonlabs; import com.google.zxing.WriterException; import com.zxing.activity.CaptureActivity; import com.zxing.encoding.EncodingHandler; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; public class BarCodeTestActivity extends Activity {  /** Called when the activity is first created. */  private TextView resultTextView;  private EditText qrStrEditText;  private ImageView qrImgImageView;  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);   resultTextView = (TextView) this.findViewById(R.id.tv_scan_result);   qrStrEditText = (EditText) this.findViewById(R.id.et_qr_string);   qrImgImageView = (ImageView) this.findViewById(R.id.iv_qr_image);   Button scanBarCodeButton = (Button) this.findViewById(R.id.btn_scan_barcode);   scanBarCodeButton.setOnClickListener(new OnClickListener() {    @Override    public void onClick(View v) {     //打开扫描界面扫描条形码或二维码     Intent openCameraIntent = new Intent(BarCodeTestActivity.this,CaptureActivity.class);     startActivityForResult(openCameraIntent, 0);    }   });   Button generateQRCodeButton = (Button) this.findViewById(R.id.btn_add_qrcode);   generateQRCodeButton.setOnClickListener(new OnClickListener() {    @Override    public void onClick(View v) {     try {      String contentString = qrStrEditText.getText().toString();      if (!contentString.equals("")) {       //根据字符串生成二维码图片并显示在界面上，第二个参数为图片的大小（350*350）       Bitmap qrCodeBitmap = EncodingHandler.createQRCode(contentString, 350);       qrImgImageView.setImageBitmap(qrCodeBitmap);      }else {       Toast.makeText(BarCodeTestActivity.this, "Text can not be empty", Toast.LENGTH_SHORT).show();      }     } catch (WriterException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }    }   });  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {   super.onActivityResult(requestCode, resultCode, data);   //处理扫描结果（在界面上显示）   if (resultCode == RESULT_OK) {    Bundle bundle = data.getExtras();    String scanResult = bundle.getString("result");    resultTextView.setText(scanResult);   }  } } 

创建项目TestQRcode,来使用BarCodeTest库

xml文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:id="@+id/container"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context="com.jikexueyuan.testqrcode.MainActivity"  tools:ignore="MergeRootFrame" >  <Button   android:id="@+id/scan"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:text="开始扫描二维码" />  <TextView    android:id="@+id/text"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:text="show"   />    <EditText      android:id="@+id/input"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:hint="请输入要编码的内容"     />    <Button      android:id="@+id/gen"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="生成二维码"     />    <ImageView      android:id="@+id/img"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="center_horizontal"     /> </LinearLayout> 

MainActivity

package com.jikexueyuan.testqrcode; import junit.framework.Test; import com.google.zxing.WriterException; import com.zxing.activity.CaptureActivity; import com.zxing.encoding.EncodingHandler; import android.app.Activity; import android.app.ActionBar; import android.app.Fragment; import android.content.Intent; import android.graphics.Bitmap; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import android.os.Build; public class MainActivity extends Activity {  private Button scanButton;  private TextView text;  private EditText input;  private Button genButton;  private ImageView img;  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   scanButton = (Button) findViewById(R.id.scan);   text = (TextView) findViewById(R.id.text);   scanButton.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View arg0) {     Toast.makeText(MainActivity.this, "你写可以扫描条形码或者二维码",       Toast.LENGTH_SHORT).show();     Intent startScan = new Intent(MainActivity.this,       CaptureActivity.class);     // startActivity(startScan);     startActivityForResult(startScan, 0);    }   });   input = (EditText) findViewById(R.id.input);   genButton = (Button) findViewById(R.id.gen);   img = (ImageView) findViewById(R.id.img);   genButton.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View arg0) {     String in = input.getText().toString();     if (in.equals("")) {      Toast.makeText(MainActivity.this, "请输入文本",        Toast.LENGTH_SHORT).show();     } else {      try {       Bitmap qrcode = EncodingHandler.createQRCode(in, 400);       img.setImageBitmap(qrcode);      } catch (WriterException e) {       e.printStackTrace();      }     }    }   });  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {   super.onActivityResult(requestCode, resultCode, data);   if (resultCode == RESULT_OK) {    String result = data.getExtras().getString("result");    text.setText(result);   }  } } 

注册CaptureActivity.java

<activity  android:configChanges="orientation|keyboardHidden"  android:name="com.zxing.activity.CaptureActivity"  android:screenOrientation="portrait"  android:theme="@android:style/Theme.NoTitleBar.Fullscreen"  android:windowSoftInputMode="stateAlwaysHidden" > </activity> 

另外还要添加两个权限，一个是振动，一个是照相机

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

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