请帮帮我， 我想制作条形码扫描仪并将结果发送到我的数据库中，但我有错误 这是我的代码：
MainActivity.java
package common.TER2015;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import youb.y.com.android.zxinglib.integrator.IntentIntegrator;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
import android.widget.Toast;
import dossier.android.ter.R;
public class MainActivity extends Activity {
private Handler handler = new Handler();
private TextView txtScanResult;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtScanResult = (TextView) findViewById(R.id.scan_result);
View btnScan = findViewById(R.id.scan_button);
// le boutton Scanner
btnScan.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// dernièer paramètre se met à true pr la lumiére
IntentIntegrator.initiateScan(MainActivity.this, R.layout.capture,
R.id.viewfinder_view, R.id.preview_view, true);
Insert task = new Insert();
task.execute(new String[]{"http://10.0.2.2:80/codebarre/insert.php"});
}
});
}
private class Insert extends AsyncTask<String, Void, Boolean>{
ProgressDialog dialog = new ProgressDialog(MainActivity.this);
@Override
protected void onPreExecute() {
dialog.setMessage("Envoi en cours..");
dialog.show();
}
@Override
protected Boolean doInBackground(String... urls) {
for(String url : urls){
try {
ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>();
pairs.add(new BasicNameValuePair("codebarre", txtScanResult.getText().toString()));
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
post.setEntity(new UrlEncodedFormEntity(pairs));
client.execute(post);
} catch (ClientProtocolException e) {
Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show();
return false;
}
catch (IOException e) {
Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show();
return false;
}
}
return true;
}
@Override
protected void onPostExecute(Boolean result) {
if(result == true ){
Toast.makeText(MainActivity.this, "Succée", Toast.LENGTH_SHORT).show(); } else{
Toast.makeText(MainActivity.this, "Echéq", Toast.LENGTH_SHORT).show();
}
dialog.dismiss();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case IntentIntegrator.REQUEST_CODE:
jim.h.common.android.zxinglib.integrator.IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if (scanResult == null) {
return;
}
final String result = scanResult.getContents();
if (result != null) {
handler.post(new Runnable() {
@Override
public void run() {
// txtScanResult.setText(result);
}
}
);
}
break;
default:
}}}
main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/white"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="80dp"
android:text="@string/scan_resut_lable"
android:textColor="#000" />
<TextView
android:id="@+id/scan_result"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/scan_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal|top"
android:text="@string/scan" />
<ImageView
android:id="@drawable/upecnoir"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="200dp"
android:src="@drawable/upecnoir" />
</LinearLayout>
Capture.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">
<SurfaceView android:id="@+id/preview_view"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:layout_centerInParent="true" />
<jim.h.common.android.zxinglib.view.ViewfinderView
android:id="@+id/viewfinder_view" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:background="#00000000" />
<TextView android:id="@+id/status_view" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_gravity="bottom|center_horizontal"
android:background="#00000000" android:text="@string/msg_default_status"
android:textColor="#ffffffff" android:textSize="14sp" />
</FrameLayout>
insert.php
<?php
//if (isset($_POST['codebr'])){
include_once("connection.php");
$codebarre = $_POST['codebarre'];
mysql_query("insert into code(codeb) values('$codebarre')");
?>
<html>
<body>
<form action="insert.php" method="post">
codebarre <input type="text" name="codebarre" /> <br/>
<input type="submit" value ="Insert" />
</form>
</body>
</html>
LogCat
06-10 04:25:26.550: W/dalvikvm(1658): threadid=12: thread exiting with uncaught exception (group=0xb1a55ba8)
06-10 04:25:26.570: E/AndroidRuntime(1658): FATAL EXCEPTION: AsyncTask #1
06-10 04:25:26.570: E/AndroidRuntime(1658): Process: dossier.android.ter, PID: 1658
06-10 04:25:26.570: E/AndroidRuntime(1658): java.lang.RuntimeException: An error occured while executing doInBackground()
06-10 04:25:26.570: E/AndroidRuntime(1658): at android.os.AsyncTask$3.done(AsyncTask.java:300)
06-10 04:25:26.570: E/AndroidRuntime(1658): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
06-10 04:25:26.570: E/AndroidRuntime(1658): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
06-10 04:25:26.570: E/AndroidRuntime(1658): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
06-10 04:25:26.570: E/AndroidRuntime(1658): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
06-10 04:25:26.570: E/AndroidRuntime(1658): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
06-10 04:25:26.570: E/AndroidRuntime(1658): at java.lang.Thread.run(Thread.java:841)
06-10 04:25:26.570: E/AndroidRuntime(1658): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
06-10 04:25:26.570: E/AndroidRuntime(1658): at android.os.Handler.<init>(Handler.java:200)
06-10 04:25:26.570: E/AndroidRuntime(1658): at android.os.Handler.<init>(Handler.java:114)
06-10 04:25:26.570: E/AndroidRuntime(1658): at android.widget.Toast$TN.<init>(Toast.java:327)
06-10 04:25:26.570: E/AndroidRuntime(1658): at android.widget.Toast.<init>(Toast.java:92)
06-10 04:25:26.570: E/AndroidRuntime(1658): at android.widget.Toast.makeText(Toast.java:241)
06-10 04:25:26.570: E/AndroidRuntime(1658): at common.TER2015.MainActivity$Insert.doInBackground(MainActivity.java:82)
06-10 04:25:26.570: E/AndroidRuntime(1658): at common.TER2015.MainActivity$Insert.doInBackground(MainActivity.java:1)
06-10 04:25:26.570: E/AndroidRuntime(1658): at android.os.AsyncTask$2.call(AsyncTask.java:288)
06-10 04:25:26.570: E/AndroidRuntime(1658): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
06-10 04:25:26.570: E/AndroidRuntime(1658): ... 3 more
06-10 04:25:32.350: I/Choreographer(1658): Skipped 234 frames! The application may be doing too much work on its main thread.
06-10 04:30:26.730: I/Process(1658): Sending signal. PID: 1658 SIG: 9
请帮我解决这个问题。
答案 0 :(得分：0)
您正在尝试从AsyncTask中的doInBackground()方法更新try-catch块中的UI（显示Toast消息）。你不能这样做。如果要显示来自doInBackground（）的Toast消息，可以使用runOnUiThread方法。例如：
catch (ClientProtocolException e) {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_SHORT).show();
return false;
}
});
}