Android APP 二维码识别时的偶尔报错（采用google 提供的例程）

[香山红叶一片片]

/**************************************************
这个例子中，绝大部分时间运行正常，偶尔出现报错，APP重启。
报错位置
sfhCamera.AutoFocusAndPreviewCallback();
请指教
***********************************************/
package com.bluetooth;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.text.DecimalFormat;
import java.util.Timer;
import java.util.TimerTask;

import com.bluetooth.R;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;

import com.google.zxing.Android.PlanarYUVLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.graphics.Bitmap;
import android.hardware.Camera;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class testCamera extends Activity {

private SurfaceView sfvCamera;
private SFHCamera sfhCamera;
private ImageView imgView;
private View centerView;
private TextView txtScanResult;
private TextView txtScanResult2;
private TextView textViewMessage;
private Timer mTimer;
private MyTimerTask mTimerTask;
// 按照标准HVGA
final static int width = 800;
final static int height = 600;

int dstLeft, dstTop, dstWidth, dstHeight;
boolean first=false;
boolean close=false;
long num=0;
boolean getqrcode=false;
boolean findQrcode=false;//识别二维码
String strResult="";
String strPrint="";
String strItem="";
String strItemTmp="";
boolean debug=false;
//boolean debug=true;

int left=100;
int top=150;
int CommandOrder=1;

String card3name="三联卡";
String card2name="二联卡";
String card3Type="3";
String card2Type="2";

float a1val=(float) 0.5;
float b1val=(float) 0.5;
float c1val=(float) 0.5;
float d1val=(float) 0.5;
float reslimit1=(float) 0.5;
float reskk1=(float) 0.5;
float rescc1=(float) 0.5;
String testmode="";
String item1="";
String item2="";
String item3="";

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.qrcodedebug);
this.setTitle("识别标准曲线");//标题
imgView = (ImageView) this.findViewById(R.id.ImageView12);//图像
centerView = (View) this.findViewById(R.id.centerView);
sfvCamera = (SurfaceView) this.findViewById(R.id.sfvCamera);//
sfhCamera = new SFHCamera(sfvCamera.getHolder(), width, height,
previewCallback);
txtScanResult=(TextView)this.findViewById(R.id.txtScanResult);
txtScanResult2=(TextView)this.findViewById(R.id.txtScanResult2);
textViewMessage = (TextView)this.findViewById(R.id.textViewMessage);



startActivity(new Intent(testCamera.this, ConsoleOpenLed2Activity.class));



if(debug)
{
textViewMessage.setTextSize(16);
imgView.setVisibility(View.VISIBLE);
}


// 初始化定时器
mTimer = new Timer();
mTimerTask = new MyTimerTask();
mTimer.schedule(mTimerTask, 0, 100);
}

class MyTimerTask extends TimerTask {
@Override
public void run() {


num++;

if (dstLeft == 0) {//只赋值一次
dstLeft = centerView.getLeft() * width
/ getWindowManager().getDefaultDisplay().getWidth();
dstTop = centerView.getTop() * height
/ getWindowManager().getDefaultDisplay().getHeight();
dstWidth = (centerView.getRight() - centerView.getLeft())* width
/ getWindowManager().getDefaultDisplay().getWidth();
dstHeight = (centerView.getBottom() - centerView.getTop())* height
/ getWindowManager().getDefaultDisplay().getHeight();
}

if(getqrcode==false)
{
if(sfhCamera != null)
{
sfhCamera.AutoFocusAndPreviewCallback();
Log.e("testCamera","AutoFocusAndPreviewCallback"+",getqrcode="+getqrcode+",");
}
}

if(num==100)
{
if(CommandOrder == 1)
{
//等待时间到
Message message = new Message();
message.what = 3;
handler.sendMessage(message);
num=0;
CommandOrder=2;
}
}
else if(num==200)
{
if(CommandOrder == 2)
{
//等待时间到
Message message = new Message();
message.what = 2;
handler.sendMessage(message);
}
}

}
}

/**
* 自动对焦后输出图片
*/
private Camera.PreviewCallback previewCallback = new Camera.PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera arg1) {

if(getqrcode==false)
{
if((sfhCamera!=null)&&(sfvCamera!=null))
{
//取得指定范围的帧的数据
PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(
data, width, height, left, top,300, 300);

//PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(
// data, width, height, 200, 600,500, 500);

//取得灰度图
Bitmap mBitmap = source.renderCroppedGreyscaleBitmap();
//显示灰度图
imgView.setImageBitmap(mBitmap);

BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
MultiFormatReader reader = new MultiFormatReader();
try {
Result result = reader.decode(bitmap);
strResult = result.getText();
if(strResult.length()>5)
{
//txtScanResult2.setText(strResult);
//showToast(getBaseContext(),strResult,100);
getqrcode=true;

//Message message = new Message();
//message.what = 1;
//handler.sendMessage(message);

if(sfhCamera!=null)sfhCamera = null;
if(sfvCamera!=null)sfvCamera = null;
if(mTimer != null) mTimer.cancel();
if(mTimerTask!=null)mTimerTask.cancel();

try {
Thread.sleep(200);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
} catch (Exception e) {
//txtScanResult.setText("Scanning");
Log.i("bperror:",e.toString());
//e.printStackTrace();
}
}
}
}
};

Handler handler = new Handler(){

public void handleMessage(Message msg) {
switch (msg.what) {

case 1:


//识别到二维码
Intent intent2=new Intent();
testCamera.this.setResult(11, intent2);

Log.e("testCamera","1 closeled");


if(CommandOrder == 1)
startActivity(new Intent(testCamera.this, ConsoleCloseLedOut2Activity.class));
else
startActivity(new Intent(testCamera.this, ConsoleCloseLedOutActivity.class));

if(sfhCamera!=null)sfhCamera = null;
if(sfvCamera!=null)sfvCamera = null;

Log.e("testCamera","1 finish");

try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

testCamera.this.finish();


break;

case 2:


if(mTimer != null) mTimer.cancel();
if(mTimerTask!=null)mTimerTask.cancel();

try {
Thread.sleep(200);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

SharedPreferences sp = getSharedPreferences("sample_prefer",Context.MODE_PRIVATE );

Editor editor = sp.edit();

editor.putString("CheckItem1", "");
editor.putString("CheckItem11","");
editor.putString("CheckItem12","");
editor.putString("CheckItem13","");
editor.putString("FindCardType1", "");

editor.commit();

Bundle bl2=new Bundle();
bl2.putInt("findidcard",2);
Intent intent2=new Intent();
intent2.putExtras(bl2);
testCamera.this.setResult(11, intent2);

Log.e("testCamera","2 closeled");

startActivity(new Intent(testCamera.this, ConsoleCloseLedOutActivity.class));

if(sfhCamera!=null)sfhCamera = null;
if(sfvCamera!=null)sfvCamera = null;

try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

Log.e("testCamera","2 finish");
testCamera.this.finish();



break;
case 3:
startActivity(new Intent(testCamera.this, ConsoleOpenLedActivity.class));
break;
}
}

};

public boolean deleteFile(String fileName) {
File file = new File(fileName);
// 如果文件路径所对应的文件存在，并且是一个文件，则直接删除
if (file.exists() && file.isFile()) {
if (file.delete()) {
//System.out.println("删除单个文件" + fileName + "成功！");
return true;
} else {
//System.out.println("删除单个文件" + fileName + "失败！");
return false;
}
} else {
//System.out.println("删除单个文件失败：" + fileName + "不存在！");
return false;
}
}

[王能]

啥错？？？？

[香山红叶一片片]

java.lang.RuntimeException: Camera is being used after Camera.release() was called

[ink_s]

关闭摄像头的时候 试试这个 ？ if (camera!=null){ camera.stopPreview(); camera.setPreviewCallback(null); camera.release(); camera = null; }