我在Android应用程序上遇到了一个奇怪的错误。我正在使用Xampp测试本地服务器。该应用程序将从数据库中检索记录并将其存储在手机中。
问题是我在Android 2.3.6的摩托罗拉XT550和Android 4.0.4的索尼Xperia S中测试了应用程序，该应用程序运行正常。但是当我用三星Fame和Android 4.1.2（我的客户的手机）进行测试时，它无效。
这是LogCat：
02-22 04:48:33.001 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
02-22 04:48:33.001 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
02-22 04:48:33.001 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:670)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at com.sistel.manantiales.SyncActivity$DatabaseSync.updateDatabase(SyncActivity.java:198)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at com.sistel.manantiales.SyncActivity$DatabaseSync.doInBackground(SyncActivity.java:165)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at com.sistel.manantiales.SyncActivity$DatabaseSync.doInBackground(SyncActivity.java:147)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at android.os.AsyncTask$2.call(AsyncTask.java:287)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
02-22 04:48:33.011 3961-3976/com.sistel.manantiales W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:137)
02-22 04:48:33.021 3961-3976/com.sistel.manantiales W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
02-22 04:48:33.021 3961-3976/com.sistel.manantiales W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
02-22 04:48:33.021 3961-3976/com.sistel.manantiales W/System.err﹕ at java.lang.Thread.run(Thread.java:856)
02-22 04:48:33.021 3961-3976/com.sistel.manantiales W/System.err﹕ Caused by: java.net.ConnectException: failed to connect to /10.0.0.7 (port 80) after 15000ms: connect failed: ENETUNREACH (Network is unreachable)
02-22 04:48:33.021 3961-3976/com.sistel.manantiales W/System.err﹕ at libcore.io.IoBridge.connect(IoBridge.java:114)
02-22 04:48:33.031 3961-3976/com.sistel.manantiales W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
02-22 04:48:33.031 3961-3976/com.sistel.manantiales W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
02-22 04:48:33.031 3961-3976/com.sistel.manantiales W/System.err﹕ at java.net.Socket.connect(Socket.java:842)
02-22 04:48:33.031 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
02-22 04:48:33.031 3961-3976/com.sistel.manantiales W/System.err﹕ at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
02-22 04:48:33.031 3961-3976/com.sistel.manantiales W/System.err﹕ ... 15 more
02-22 04:48:33.041 3961-3976/com.sistel.manantiales W/System.err﹕ Caused by: libcore.io.ErrnoException: connect failed: ENETUNREACH (Network is unreachable)
02-22 04:48:33.081 1216-1467/? V/AudioFlinger﹕ presentationComplete() session 35 complete: framesWritten 940032
02-22 04:48:33.081 1216-1467/? V/AudioFlinger﹕ TrackBase::reset
02-22 04:48:33.091 3961-3976/com.sistel.manantiales W/System.err﹕ at libcore.io.Posix.connect(Native Method)
02-22 04:48:33.091 3961-3964/com.sistel.manantiales D/dalvikvm﹕ GC_CONCURRENT freed 197K, 13% free 7645K/8775K, paused 16ms+16ms, total 54ms
02-22 04:48:33.091 3961-3976/com.sistel.manantiales W/System.err﹕ at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
02-22 04:48:33.091 3961-3976/com.sistel.manantiales W/System.err﹕ at libcore.io.IoBridge.connectErrno(IoBridge.java:144)
02-22 04:48:33.101 3961-3976/com.sistel.manantiales W/System.err﹕ at libcore.io.IoBridge.connect(IoBridge.java:112)
02-22 04:48:33.101 3961-3976/com.sistel.manantiales W/System.err﹕ ... 20 more
02-22 04:48:33.101 1577-1800/? D/PowerManagerService﹕ acquireDVFSLockLocked : type : DVFS_MIN_LIMIT frequency : 999999 uid : 1000 pid : 1577 tag : ActivityManager
02-22 04:48:33.101 1577-1800/? W/ActivityManager﹕ mDVFSLock.acquire()
02-22 04:48:33.141 1577-1800/? D/BatteryStatsImpl﹕ ++++++xy WakeLock start : pid=1577, name=, type=0, tid=1800, pid=1577, pName=null
02-22 04:48:33.161 1577-1588/? D/WindowManager﹕ PhoneWindowManager: focusChangedLw
02-22 04:48:33.161 1577-1588/? D/WindowManager﹕ updateReadingMode
02-22 04:48:33.161 1577-1588/? D/KeyguardViewMediator﹕ setHidden false
02-22 04:48:33.161 1577-1588/? D/WindowManager﹕ mInputFocus is not null.
02-22 04:48:33.161 1577-1588/? D/WindowManager﹕ mInputFocus is not null.
02-22 04:48:33.161 1577-1588/? D/WindowManager﹕ mInputFocus is not null.
02-22 04:48:33.191 3961-3961/com.sistel.manantiales D/AbsListView﹕ Get MotionRecognitionManager
02-22 04:48:33.211 3961-3976/com.sistel.manantiales W/dalvikvm﹕ threadid=11: thread exiting with uncaught exception (group=0x411ba2a0)
02-22 04:48:33.211 1577-1810/? D/WindowManager﹕ mInputFocus is not null.
02-22 04:48:33.211 3961-3976/com.sistel.manantiales E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.IllegalArgumentException: HTTP entity may not be null
at org.apache.http.util.EntityUtils.toString(EntityUtils.java:110)
at org.apache.http.util.EntityUtils.toString(EntityUtils.java:146)
at com.sistel.manantiales.SyncActivity$DatabaseSync.updateDatabase(SyncActivity.java:217)
at com.sistel.manantiales.SyncActivity$DatabaseSync.doInBackground(SyncActivity.java:165)
at com.sistel.manantiales.SyncActivity$DatabaseSync.doInBackground(SyncActivity.java:147)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
这是我的代码：
public class DatabaseSync extends AsyncTask<String, Void, Boolean> {
@Override
protected Boolean doInBackground(String... url) {
try {
clientDataSource.open();
} catch (SQLException e) {
e.printStackTrace();
}
try {
movementDataSource.open();
} catch (SQLException e) {
e.printStackTrace();
}
clientDataSource.deleteAllClients();
updateDatabase(url[0]);
return null;
}
@Override
protected void onPostExecute(Boolean bool) {
super.onPostExecute(bool);
}
public void updateDatabase(String url) {
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("Operation", "Download"));
nameValuePairs.add(new BasicNameValuePair("Value", "Download"));
HttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, 15000);
HttpConnectionParams.setSoTimeout(httpParams, 15000);
HttpClient httpClient = new DefaultHttpClient(httpParams);
HttpPost httpPost = new HttpPost(url);
try {
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
HttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(httpPost);
} catch (IOException e) {
e.printStackTrace();
}
HttpEntity httpEntity = null;
try {
httpEntity = httpResponse.getEntity();
}catch (NullPointerException e) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
}
String result = "empty";
try {
result = EntityUtils.toString(httpEntity);
} catch (IOException e) {
e.printStackTrace();
}
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(result);
} catch (JSONException e) {
e.printStackTrace();
}
JSONArray jsonClients = null;
try {
jsonClients = jsonObject.getJSONArray("clients");
} catch (JSONException e) {
e.printStackTrace();
}
long id = 0;
String name;
String address;
String locality;
long bonus = 0;
double price = 0.0;
double prev_balance = 0.0;
double balance = 0.0;
long prev_bottles = 0;
long bottles = 0;
String update_date;
String sync_date;
for(int i = 0; i < jsonClients.length(); i++) {
JSONObject json = null;
try {
json = jsonClients.getJSONObject(i);
String s_id = new String(Base64.decode(json.get("id").toString(),Base64.DEFAULT));
name = new String(Base64.decode(json.get("name").toString(),Base64.DEFAULT));
address = new String(Base64.decode(json.get("address").toString(), Base64.DEFAULT));
locality = new String(Base64.decode(json.get("locality").toString(), Base64.DEFAULT));
String s_bonus = new String(Base64.decode(json.get("bonus").toString(), Base64.DEFAULT));
String s_price = new String(Base64.decode(json.get("price").toString(), Base64.DEFAULT));
String s_prev_balance = new String(Base64.decode(json.get("prev_balance").toString(), Base64.DEFAULT));
String s_balance = new String(Base64.decode(json.get("balance").toString(), Base64.DEFAULT));
String s_prev_bottles = new String(Base64.decode(json.get("prev_bottles").toString(), Base64.DEFAULT));
String s_bottles = new String(Base64.decode(json.get("bottles").toString(), Base64.DEFAULT));
update_date = new String(Base64.decode(json.get("update_date").toString(), Base64.DEFAULT));
sync_date = new String(Base64.decode(json.get("sync_date").toString(), Base64.DEFAULT));
id = Long.parseLong(s_id);
bonus = Long.parseLong(s_bonus);
price = Double.parseDouble(s_price);
prev_balance = Double.parseDouble(s_prev_balance);
balance = Double.parseDouble(s_balance);
prev_bottles = Long.parseLong(s_prev_bottles);
bottles = Long.parseLong(s_bottles);
Client client = new Client(id, name, address, locality, bonus, price,
prev_balance, balance, prev_bottles, bottles, update_date, sync_date);
clientDataSource.insertClient(client);
} catch (JSONException e) {
e.printStackTrace();
}
}
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
}
}
答案 0 :(得分：49)
我已经弄清楚问题出在哪里了！三星名人堂没有连接到Wi-Fi。 它没有互联网。
答案 1 :(得分：8)
您还可以在发出任何请求之前添加互联网连接检查，以便用户知道互联网不存在。
使用下面的代码，如果它返回false显示Toast / Alert。
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
答案 2 :(得分：1)
当我的应用程序连接时有一个案例然后关闭wifi＆gt;应用程序崩溃，它无法进入catch命令异常。
答案 3 :(得分：0)
请检查设备上的Internet / WiFi连接