android二维码扫描

最新推荐文章于 2025-05-26 12:16:12 发布

iam王有才

最新推荐文章于 2025-05-26 12:16:12 发布

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本文链接：https://blog.youkuaiyun.com/qq_35549248/article/details/53610698

这篇博客介绍了如何在Android中实现二维码扫描功能。首先，创建扫描界面MipcaActivityCapture，然后在主activity展示扫描到的二维码信息。接着，详细说明了主函数及扫描界面的XML布局。博主提供了zxing库的下载链接，并分享了包含具体代码的demo下载地址。

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1.编写扫描界面MipcaActivityCapture

package demo1.administrator.example.com.myapplication.qr_codescan;

import java.io.IOException;
import java.util.Vector;

import android.app.Activity;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.graphics.Bitmap;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.Vibrator;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;

import demo1.administrator.example.com.mining.app.zxing.camera.CameraManager;
import demo1.administrator.example.com.mining.app.zxing.decoding.CaptureActivityHandler;
import demo1.administrator.example.com.mining.app.zxing.decoding.InactivityTimer;
import demo1.administrator.example.com.mining.app.zxing.view.ViewfinderView;
import demo1.administrator.example.com.myapplication.R;

/**
 * Initial the camera
 * @author Ryan.Tang
 */
public class MipcaActivityCapture extends Activity implements Callback {

    private CaptureActivityHandler handler;
    private ViewfinderView viewfinderView;
    private boolean hasSurface;
    private Vector<BarcodeFormat> decodeFormats;
    private String characterSet;
    private InactivityTimer inactivityTimer;
    private MediaPlayer mediaPlayer;
    private boolean playBeep;
    private static final float BEEP_VOLUME = 0.10f;
    private boolean vibrate;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_capture);
        //ViewUtil.addTopView(getApplicationContext(), this, R.string.scan_card);
        CameraManager.init(getApplication());
        viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);

        Button mButtonBack = (Button) findViewById(R.id.button_back);
        mButtonBack.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MipcaActivityCapture.this.finish();

            }
        });
        hasSurface = false;
        inactivityTimer = new InactivityTimer(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        if (hasSurface) {
            initCamera(surfaceHolder);
        } else {
            surfaceHolder.addCallback(this);
            surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }
        decodeFormats = null;
        characterSet = null;

        playBeep = true;
        AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
        if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
            playBeep = false;
        }
        initBeepSound();
        vibrate = true;

    }

    @Override
    protected void onPause() {
        super.onPause();
        if (handler != null) {
            handler.quitSynchronously();
            handler = null;
        }
        CameraManager.get().closeDriver();
    }

    @Override
    protected void onDestroy() {
        inactivityTimer.shutdown();
        super.onDestroy();
    }

    /**
     * ����ɨ����
     * @param result
     * @param barcode
     */
    public void handleDecode(Result result, Bitmap barcode) {
        inactivityTimer.onActivity();
        playBeepSoundAndVibrate();
        String resultString = result.getText();
        if (resultString.equals("")) {
            Toast.makeText(MipcaActivityCapture.this, "Scan failed!", Toast.LENGTH_SHORT).show();
        }else {
            Intent resultIntent = new Intent();
            Bundle bundle = new Bundle();
            bundle.putString("result", resultString);//返回的字符串
//          bundle.putParcelable("bitmap", barcode);//返回的图片
            resultIntent.putExtras(bundle);
            this.setResult(RESULT_OK, resultIntent);
        }
        MipcaActivityCapture.this.finish();
    }

    private void initCamera(SurfaceHolder surfaceHolder) {
        try {
            CameraManager.get().openDriver(surfaceHolder);
        } catch (IOException ioe) {
            return;
        } catch (RuntimeException e) {
            return;
        }
        if (handler == null) {
            handler = new CaptureActivityHandler(this, decodeFormats,
                    characterSet);
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {

    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (!hasSurface) {
            hasSurface = true;
            initCamera(holder);
        }

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        hasSurface = false;

    }

    public ViewfinderView getViewfinderView() {
        return viewfinderView;
    }

    public Handler getHandler() {
        return handler;
    }

    public void drawViewfinder() {
        viewfinderView.drawViewfinder();

    }

    private void initBeepSound() {
        if (playBeep && mediaPlayer == null) {
            // The volume on STREAM_SYSTEM is not adjustable, and users found it
            // too loud,
            // so we now play on the music stream.
            setVolumeControlStream(AudioManager.STREAM_MUSIC);
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setOnCompletionListener(beepListener);

            AssetFileDescriptor file = getResources().openRawResourceFd(
                    R.raw.beep);
            try {
                mediaPlayer.setDataSource(file.getFileDescriptor(),
                        file.getStartOffset(), file.getLength());
                file.close();
                mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
                mediaPlayer.prepare();
            } catch (IOException e) {
                mediaPlayer = null;
            }
        }
    }

    private static final long VIBRATE_DURATION = 200L;

    private void playBeepSoundAndVibrate() {
        if (playBeep && mediaPlayer != null) {
            mediaPlayer.start();
        }
        if (vibrate) {
            Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
            vibrator.vibrate(VIBRATE_DURATION);
        }
    }

    /**
     * When the beep has finished playing, rewind to queue up another one.
     */
    private final OnCompletionListener beepListener = new OnCompletionListener() {
        public void onCompletion(MediaPlayer mediaPlayer) {
            mediaPlayer.seekTo(0);
        }
    };

}

2.主activity里显示二维码储存的信息

package demo1.administrator.example.com.myapplication.qr_codescan;


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.ImageView;
import android.widget.TextView;

import demo1.administrator.example.com.myapplication.R;

public class MainActivity extends Activity {
    private final static int SCANNIN_GREQUEST_CODE = 1;
    /**
     * 显示扫描出的string
     */
    private TextView mTextView ;
    /**
     * 显示扫描出的image
     */
    private ImageView mImageView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = (TextView) findViewById(R.id.result); 
        mImageView = (ImageView) findViewById(R.id.qrcode_bitmap);

        //点击按钮跳转到二维码扫描界面，这里用的是startActivityForResult跳转
        //扫描完了之后调到该界面
        Button mButton = (Button) findViewById(R.id.button1);
        mButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setClass(MainActivity.this,MipcaActivityCapture.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivityForResult(intent, SCANNIN_GREQUEST_CODE);
            }
        });
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
        case SCANNIN_GREQUEST_CODE:
            if(resultCode == RESULT_OK){
                Bundle bundle = data.getExtras();
                //显示扫描到的内容
                mTextView.setText(bundle.getString("result"));

//              mImageView.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap"));//如果二维码里没有图片会报错
            }
            break;
        }
    }   

}

3.主函数xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffe1e0de" >

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:text="扫描二维码" />

    <TextView
        android:id="@+id/result"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:lines="2"
        android:gravity="center_horizontal"
        android:textColor="@android:color/black"
        android:textSize="16sp" />

    <ImageView
        android:id="@+id/qrcode_bitmap"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/result"/>
</RelativeLayout>

4.扫描界面xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <SurfaceView
            android:id="@+id/preview_view"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_gravity="center" />

        <demo1.administrator.example.com.mining.app.zxing.view.ViewfinderView
            android:id="@+id/viewfinder_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <include
            android:id="@+id/include1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            layout="@layout/activity_title" />
    </RelativeLayout>

</FrameLayout>