自定义ZXing二维码扫描界面并解决取景框拉伸等问题

2019独角兽企业重金招聘Python工程师标准>>>

先看效果

 

扫描内容是下面这张，二维码是用zxing库生成的

 

由于改了好几个类，还是去年的事都忘得差不多了，所以只能上这个类的代码了，主要就是改了这个CaptureActivity.java

 

package com.zxing.activity;

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.Handler;
import android.os.Vibrator;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.widget.Toast;

import com.ericssonlabs.R;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.zxing.camera.CameraManager;
import com.zxing.decoding.CaptureActivityHandler;
import com.zxing.decoding.CaptureActivityHandler.DecodeCallback;
import com.zxing.decoding.InactivityTimer;
import com.zxing.view.ViewfinderView;
/**
 * Initial the camera
 * @author Ryan.Tang
 * @modifier Lemon
 * @use extends CaptureActivity并且在setContentView方法后调用init方法
 */
public abstract class CaptureActivity extends Activity implements Callback, DecodeCallback {
	//	private static final String TAG = "CaptureActivity";

	protected Activity context;
	protected SurfaceView surfaceView;
	protected ViewfinderView viewfinderView;
	/**初始化，必须在setContentView之后
	 * @param context
	 * @param viewfinderView
	 */
	protected void init(Activity context, SurfaceView surfaceView, ViewfinderView viewfinderView) {
		this.context = context;
		this.surfaceView = surfaceView;
		this.viewfinderView = viewfinderView;

		CameraManager.init(getApplication());

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


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


	@Override
	protected void onResume() {
		super.onResume();
		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();
	}


	public static final String RESULT_QRCODE_STRING = "RESULT_QRCODE_STRING";
	/**
	 * Handler scan result
	 * @param result
	 * @param barcode
	 */
	public void handleDecode(Result result, Bitmap barcode) {
		inactivityTimer.onActivity();
		playBeepSoundAndVibrate();
		String resultString = result.getText();
		//FIXME
		if (resultString.equals("")) {
			Toast.makeText(CaptureActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show();
		}

		setResult(RESULT_OK, new Intent().putExtra(RESULT_QRCODE_STRING, resultString));
		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, viewfinderView, this);
		}
	}

	@Override
	public void drawViewfinder() {
		viewfinderView.drawViewfinder();		
	}


	@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 Handler getHandler() {
		return handler;
	}


	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);
		}
	};

}

使用方法： 新建一个Activity继承CaptureActivity并且在setContentView方法后调用init方法即可。
示例：

CameraScanActivity.java

package zuo.biao.activity;

import zuo.biao.R;
import zuo.biao.library.interfaces.OnBottomDragListener;
import zuo.biao.util.ActivityUtil;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;

import com.zxing.activity.CaptureActivity;
import com.zxing.camera.CameraManager;
import com.zxing.view.ViewfinderView;

/**扫描二维码Activity
 * @author Lemon
 * @use 参考zuo.biao.library.ModelActivity
 */
public class CameraScanActivity extends CaptureActivity implements Callback, OnClickListener, OnBottomDragListener {
	public static final String TAG = ActivityUtil.TAG_CAMERA_SCAN_ACTIVITY;

	//启动方法<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

	/**启动这个Activity的Intent
	 * @param context
	 * @param title
	 * @return
	 */
	public static Intent createIntent(Context context) {
		return new Intent(context, CameraScanActivity.class);
	}

	//启动方法>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>



	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.camera_scan_activity);
		init(this, (SurfaceView) findViewById(R.id.svCameraScan), (ViewfinderView) findViewById(R.id.vfvCameraScan));

		//功能归类分区方法，必须调用<<<<<<<<<<
		initView();
		initData();
		initListener();
		//功能归类分区方法，必须调用>>>>>>>>>>

	}


	//UI显示区(操作UI，但不存在数据获取或处理代码，也不存在事件监听代码)<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

	public void initView() {//必须调用

	}



	//UI显示区(操作UI，但不存在数据获取或处理代码，也不存在事件监听代码)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>










	//data数据区(存在数据获取或处理代码，但不存在事件监听代码)<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

	public void initData() {//必须调用

	}


	//data数据区(存在数据获取或处理代码，但不存在事件监听代码)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>








	//listener事件监听区(只要存在事件监听代码就是)<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

	public void initListener() {//必须调用

		findViewById(R.id.tvCameraScanReturn).setOnClickListener(this);
		findViewById(R.id.ivCameraScanReturn).setOnClickListener(this);
		findViewById(R.id.ivCameraScanLight).setOnClickListener(this);
		findViewById(R.id.ivCameraScanMyQRCode).setOnClickListener(this);
	}

	//系统自带监听方法<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

	@Override
	public void onDragBottom(boolean rightToLeft) {
		if (rightToLeft) {

			return;
		}

		finish();
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.tvCameraScanReturn:
		case R.id.ivCameraScanReturn:
			onDragBottom(false);
			break;
		case R.id.ivCameraScanLight:
			switchLight(! isOpen);
			break;
		case R.id.ivCameraScanMyQRCode:
			//
			break;
		default:
			break;
		}
	}


	private boolean isOpen = false;
	/**打开或关闭闪关灯
	 * @param open
	 */
	private void switchLight(boolean open) {
		if (open == isOpen) {
			return;
		}
		isOpen = CameraManager.get().switchLight(open);
	}


	//类相关监听<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<


	//类相关监听>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

	//系统自带监听方法>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


	//listener事件监听区(只要存在事件监听代码就是)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>








	//内部类,尽量少用<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<



	//内部类,尽量少用>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

}

CameraScanActivity布局文件camera_scan_activity.xml

布局文件因为使用了ZBLibrary中的一些style，color等，只有这个layout的话会出现一些错误。自己新建一个layout文件并把ViewfinderView放到最外层布局文件内就行了。当然下载好下面附上的源码就没这问题了。

对了，记得在AndroidManifest.xml中加上这些权限：

    

    

    

    

 

附源码（欢迎Star，欢迎Fork）

 

GitHub源码      https://github.com/TommyLemon/Android-ZBLibrary 

开源中国源码    http://git.oschina.net/Lemon19950301/Android-ZBLibrary 

 

转载于:https://my.oschina.net/tommylemon/blog/687986