我有一个查询VIN的php / mysql查询，如果VIN在数据库中它返回＆＃34; VIN已经存在＆＃34;我在哪里弄错了：错误报告说Fatal Exception : AsyncTask #2（我的代码实际上比这更好，当我在启动Sell页面之前尝试重写这个以运行php checkVin时问题就开始了）
11-21 16:34:43.736: E/AndroidRuntime(725): FATAL EXCEPTION: AsyncTask #2
11-21 16:34:43.736: E/AndroidRuntime(725): java.lang.RuntimeException: An error occured while executing doInBackground()
11-21 16:34:43.736: E/AndroidRuntime(725): at android.os.AsyncTask$3.done(AsyncTask.java:299)
11-21 16:34:43.736: E/AndroidRuntime(725): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
11-21 16:34:43.736: E/AndroidRuntime(725): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
11-21 16:34:43.736: E/AndroidRuntime(725): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
11-21 16:34:43.736: E/AndroidRuntime(725): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
11-21 16:34:43.736: E/AndroidRuntime(725): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
11-21 16:34:43.736: E/AndroidRuntime(725): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
11-21 16:34:43.736: E/AndroidRuntime(725): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
11-21 16:34:43.736: E/AndroidRuntime(725): at java.lang.Thread.run(Thread.java:856)
11-21 16:34:43.736: E/AndroidRuntime(725): Caused by: java.lang.IllegalArgumentException: Host name may not be null
11-21 16:34:43.736: E/AndroidRuntime(725): at org.apache.http.HttpHost.<init>(HttpHost.java:83)
11-21 16:34:43.736: E/AndroidRuntime(725): at org.apache.http.impl.client.AbstractHttpClient.determineTarget(AbstractHttpClient.java:497)
11-21 16:34:43.736: E/AndroidRuntime(725): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:626)
11-21 16:34:43.736: E/AndroidRuntime(725): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
11-21 16:34:43.736: E/AndroidRuntime(725): at com.mobile.donswholesale.Scan.getServerResopnse(Scan.java:272)
11-21 16:34:43.736: E/AndroidRuntime(725): at com.mobile.donswholesale.Scan.access$1(Scan.java:260)
11-21 16:34:43.736: E/AndroidRuntime(725): at com.mobile.donswholesale.Scan$4.doInBackground(Scan.java:240)
11-21 16:34:43.736: E/AndroidRuntime(725): at com.mobile.donswholesale.Scan$4.doInBackground(Scan.java:1)
11-21 16:34:43.736: E/AndroidRuntime(725): at android.os.AsyncTask$2.call(AsyncTask.java:287)
11-21 16:34:43.736: E/AndroidRuntime(725): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
11-21 16:34:43.736: E/AndroidRuntime(725): ... 5 more
private void addSellButtonListener() {
Button sell = (Button) findViewById(R.id.sell_button);
sell.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendDatatoServer();
}
});
}
private String formatDataAsJASON() {
JSONObject root = new JSONObject();
try {
root.put("User", userId.getText().toString());
root.put("Pword", userPass.getText().toString());
root.put("VIN", VINID.getText().toString());
return root.toString();
} catch (JSONException e) {
Log.d("JWP", "Can't format JSON");
}
return null;
}
private void sendDatatoServer() {
final String json = formatDataAsJASON();
new AsyncTask<Void, Void, String>() {
@Override
protected String doInBackground(Void... params) {
return getServerResopnse(json);
}
@Override
protected void onPostExecute(String result) {
if (result == "VIN already exists") {
Toast.makeText(Scan.this,
getString(R.string.vin_exists), Toast.LENGTH_LONG)
.show();
final Intent i = new Intent(Scan.this, Scan.class);
startActivity(i);
} else {
StartSell();
}
}
}.execute();
}
private String getServerResopnse(String json) {
HttpPost post = new HttpPost("http://" + serverIp.getText().toString()
+ "/chekVIN.php");
try {
StringEntity entity = new StringEntity(json);
post.setEntity(entity);
post.setHeader("Content-type", "application/json");
DefaultHttpClient client = new DefaultHttpClient();
BasicResponseHandler handler = new BasicResponseHandler();
String response = client.execute(post, handler);
return response;
} catch (UnsupportedEncodingException e) {
Log.d("JWP", e.toString());
} catch (ClientProtocolException e) {
Log.d("JWP", e.toString());
} catch (IOException e) {
Log.d("JWP", e.toString());
}
return null;
}
private void StartSell() {
final Intent i = new Intent(Scan.this, Sell.class);
EditText editText = (EditText) findViewById(R.id.VIN);
String text = editText.getText().toString();
EditText editText2 = (EditText) findViewById(R.id.Make);
String text2 = editText2.getText().toString();
EditText editText3 = (EditText) findViewById(R.id.Model);
String text3 = editText3.getText().toString();
EditText editText4 = (EditText) findViewById(R.id.Color);
String text4 = editText4.getText().toString();
EditText editText5 = (EditText) findViewById(R.id.Year);
String text5 = editText5.getText().toString();
try {
FileOutputStream fos = openFileOutput(VinHolder,
Context.MODE_PRIVATE);
fos.write(text.getBytes());
fos.close();
FileOutputStream fos2 = openFileOutput(MakeHolder,
Context.MODE_PRIVATE);
fos2.write(text2.getBytes());
fos2.close();
FileOutputStream fos3 = openFileOutput(ModelHolder,
Context.MODE_PRIVATE);
fos3.write(text3.getBytes());
fos3.close();
FileOutputStream fos4 = openFileOutput(ColorHolder,
Context.MODE_PRIVATE);
fos4.write(text4.getBytes());
fos4.close();
FileOutputStream fos5 = openFileOutput(YearHolder,
Context.MODE_PRIVATE);
fos5.write(text5.getBytes());
fos5.close();
}
catch (Exception e) {
Log.d("DEBUGTAG", "File Not Saved" + text);
e.printStackTrace();
}
startActivity(i);
}
答案 0 :(得分：0)
因为我使用来自应用程序另一页面的文本文件来保存手动输入的IP地址，所以我需要携带该信息以便HttpPost（“http：//”+ serverIp.getText（）。toString （）+“chechvin.php”）;实际上会有ip地址。 添加后：
public static final String SERVERIP =“sinfo.txt”;
一切正常。