使用开源代码实现二维码扫描和生成

把BarCodeTest导到ADT中,然后建立自己的工程TestQRcode,并关联BarCodeTest.在TestQRcode工程配置文件中添加权限

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

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

package com.zxy.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, "你可以扫描二维码或者条形码", Toast.LENGTH_SHORT).show();
Intent  startScan = new Intent(MainActivity.this, CaptureActivity.class);

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);
}
}
}

<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.zxy.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="展示结果"
/>
<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>