使用開源代碼實現二維碼掃描和生成

Github下載開源代碼https://github.com/搜搜索zxing

把BarCodeTest導到ADT中,然後建立自己的工程TestQRcode,並關聯BarCodeTest.在TestQRcode工程配置文件中添加權限

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

TestQRcode工程下代碼:
MainActivity.java

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, "你可以掃描二維碼或者條形碼", 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, "請輸入文本", 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);
        }
    }
}

activity_main.xml

<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="開始掃描二維碼" />
    <TextView 
        android:id="@+id/text"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="展示結果"
        />
   <EditText 
       android:id="@+id/input"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:hint="請輸入要編碼的內容"
       />
   <Button 
       android:id="@+id/gen"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:text="生成二維碼"
       />
   <ImageView 
       android:id="@+id/img"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_gravity="center_horizontal"
       />

</LinearLayout>