警报对话框导致窗口泄漏 [英] Window leak due to alert dialog
本文介绍了警报对话框导致窗口泄漏的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
Android开发中的一个相当新的东西，我不断收到窗口泄漏异常，这可能是由于使用了我制作的警报框所致.在寻找必须更改的内容时，我尝试了很多事情，但找不到错误.也许有人可以帮助我查看我的代码?
Quite new in Android development, I keep getting a window leak exception, probably due to use of an alertbox I made. In searching for what I have to change, I tried a bunch of things and I can't find my error. Maybe someone can help me look through my code?
public class LogInActivity extends Activity {
EditText gebruikersnaamET, paswoordET;
TextView titel;
TextView gebruikersnaamTV;
TextView paswoordTV;
TextView geenAccount;
Button ok;
String url = "";
final Context context = this;
String username = "";
SharedPreferences settings;
AlertBox alert;
Gebruiker g = null;
private ProgressDialog pDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// http://stackoverflow.com/questions/4544302/android-prevent-user-from-coming-back-to-login-page-after-logging-in
settings = context.getSharedPreferences("CoNeePrefs", 0);
boolean isLogged = settings.getBoolean("isLogged", false);
setTitle("Log in");
setContentView(R.layout.activity_log_in);
gebruikersnaamET = (EditText) findViewById(R.id.et_un);
gebruikersnaamET.requestFocus();
gebruikersnaamET.setTypeface(MyFonts.Fonts.PRESSTART);
paswoordET = (EditText) findViewById(R.id.et_pw);
paswoordET.setTypeface(MyFonts.Fonts.PRESSTART);
ok = (Button) findViewById(R.id.btn_login);
ok.setTypeface(MyFonts.Fonts.PRESSTART);
titel = (TextView) findViewById(R.id.titel);
// titel.setTypeface(MyFonts.Fonts.PRESSTART);
Typeface face;
face = Typeface.createFromAsset(getAssets(), "fonts/pressstart.ttf");
titel.setTypeface(face);
gebruikersnaamTV = (TextView) findViewById(R.id.tv_un);
gebruikersnaamTV.setTypeface(MyFonts.Fonts.PRESSTART);
paswoordTV = (TextView) findViewById(R.id.tv_pw);
paswoordTV.setTypeface(MyFonts.Fonts.PRESSTART);
geenAccount = (TextView) findViewById(R.id.nogGeenAccount);
geenAccount.setTypeface(MyFonts.Fonts.PRESSTART);
g = new Gebruiker();
if (isLogged) {
Intent intent = new Intent(context, MenuActivity.class);
intent.putExtra("gebruikersnaam",
settings.getString("gebruikersnaam", "none"));
startActivity(intent);
finish();
} else {
ok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new checkUserDetails().execute();
}
});
}
geenAccount.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(context, RegisterActivity.class);
startActivity(intent);
finish();
}
});
}
// http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/
class checkUserDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(LogInActivity.this);
pDialog.setMessage("In aan het loggen...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting product details in background thread
* */
protected String doInBackground(String... params) {
url = "http://iwtsl.ehb.be/~iris.vdz/check.php";
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("gebruikersnaam",
gebruikersnaamET.getText().toString()));
postParameters.add(new BasicNameValuePair("paswoord", paswoordET
.getText().toString()));
// String valid = "1";
String res = null;
String username = gebruikersnaamET.getText().toString();
try {
res = DatabaseAccess.getInstance().phpUitvoeren(postParameters,
url);
if (res.equals("1")) {
g = DatabaseAccess.getInstance().getUser(username);
String adres = g.getStraat() + " - " + g.getPostcode()
+ " " + g.getGemeente();
String volledigeNaam = g.getVoornaam() + " " + g.getNaam();
settings = context.getSharedPreferences("CoNeePrefs", 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("isLogged", true);
editor.putString("gebruikersnaam", g.getGebruikersnaam());
editor.putString("naam", volledigeNaam);
editor.putString("e-mail", g.getEmail());
editor.putString("adres", adres);
editor.putString("paswoord",
g.getEncodedPaswoord(g.getPaswoord()));
editor.commit();
Intent intent = new Intent(context, MenuActivity.class);
startActivity(intent);
finish();
} else {
alert = new AlertBox(context, "Error",
"Er is iets misgegaan, probeer opnieuw!\nMogelijke redenen:\n"
+ "- u heeft geen internetverbinding\n"
+ "- u heeft geen juiste login ingegeven\n"
+ "- er is een probleem met het netwerk\n"
+ "- er is een probleem met de database");
}
} catch (Exception e) {
alert = new AlertBox(context, "Error", e.toString());
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
}
这是AlertBox的代码:
This is the code for the AlertBox:
public class AlertBox {
public AlertBox(Context context, String title, String mymessage){
new AlertDialog.Builder(context)
.setMessage(mymessage)
.setTitle(title)
.setCancelable(true)
.setNeutralButton(android.R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton){
}})
.show();
}
}
这是我得到的堆栈跟踪:
this is the stack-trace i'm getting:
04-07 14:31:28.230: E/AndroidRuntime(10287): FATAL EXCEPTION: AsyncTask #1
04-07 14:31:28.230: E/AndroidRuntime(10287): java.lang.RuntimeException: An error occured while executing doInBackground()
04-07 14:31:28.230: E/AndroidRuntime(10287): at android.os.AsyncTask$3.done(AsyncTask.java:200)
04-07 14:31:28.230: E/AndroidRuntime(10287): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
04-07 14:31:28.230: E/AndroidRuntime(10287): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
04-07 14:31:28.230: E/AndroidRuntime(10287): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
04-07 14:31:28.230: E/AndroidRuntime(10287): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
04-07 14:31:28.230: E/AndroidRuntime(10287): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
04-07 14:31:28.230: E/AndroidRuntime(10287): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
04-07 14:31:28.230: E/AndroidRuntime(10287): at java.lang.Thread.run(Thread.java:1019)
04-07 14:31:28.230: E/AndroidRuntime(10287): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
04-07 14:31:28.230: E/AndroidRuntime(10287): at android.os.Handler.(Handler.java:121)
04-07 14:31:28.230: E/AndroidRuntime(10287): at android.app.Dialog.(Dialog.java:101)
04-07 14:31:28.230: E/AndroidRuntime(10287): at android.app.AlertDialog.(AlertDialog.java:63)
04-07 14:31:28.230: E/AndroidRuntime(10287): at android.app.AlertDialog$Builder.create(AlertDialog.java:797)
04-07 14:31:28.230: E/AndroidRuntime(10287): at android.app.AlertDialog$Builder.show(AlertDialog.java:812)
04-07 14:31:28.230: E/AndroidRuntime(10287): at be.iwt.ehb.conee.extrafeatures.AlertBox.(AlertBox.java:20)
04-07 14:31:28.230: E/AndroidRuntime(10287): at be.iwt.ehb.conee.activities.LogInActivity$checkUserDetails.doInBackground(LogInActivity.java:178)
04-07 14:31:28.230: E/AndroidRuntime(10287): at be.iwt.ehb.conee.activities.LogInActivity$checkUserDetails.doInBackground(LogInActivity.java:1)
04-07 14:31:28.230: E/AndroidRuntime(10287): at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-07 14:31:28.230: E/AndroidRuntime(10287): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
04-07 14:31:28.230: E/AndroidRuntime(10287): ... 4 more
04-07 14:31:28.661: W/IInputConnectionWrapper(10287): showStatusIcon on inactive InputConnection
04-07 14:31:28.681: D/dalvikvm(10287): GC_CONCURRENT freed 200K, 49% free 2915K/5639K, external 303K/558K, paused 18ms+62ms
04-07 14:31:29.381: E/WindowManager(10287): Activity be.iwt.ehb.conee.activities.LogInActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40538cb0 that was originally added here
04-07 14:31:29.381: E/WindowManager(10287): android.view.WindowLeaked: Activity be.iwt.ehb.conee.activities.LogInActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40538cb0 that was originally added here
04-07 14:31:29.381: E/WindowManager(10287): at android.view.ViewRoot.(ViewRoot.java:259)
04-07 14:31:29.381: E/WindowManager(10287): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
04-07 14:31:29.381: E/WindowManager(10287): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
04-07 14:31:29.381: E/WindowManager(10287): at android.view.Window$LocalWindowManager.addView(Window.java:465)
04-07 14:31:29.381: E/WindowManager(10287): at android.app.Dialog.show(Dialog.java:241)
04-07 14:31:29.381: E/WindowManager(10287): at be.iwt.ehb.conee.activities.LogInActivity$checkUserDetails.onPreExecute(LogInActivity.java:127)
04-07 14:31:29.381: E/WindowManager(10287): at android.os.AsyncTask.execute(AsyncTask.java:391)
04-07 14:31:29.381: E/WindowManager(10287): at be.iwt.ehb.conee.activities.LogInActivity$1.onClick(LogInActivity.java:96)
04-07 14:31:29.381: E/WindowManager(10287): at android.view.View.performClick(View.java:2506)
04-07 14:31:29.381: E/WindowManager(10287): at android.view.View$PerformClick.run(View.java:9112)
04-07 14:31:29.381: E/WindowManager(10287): at android.os.Handler.handleCallback(Handler.java:587)
04-07 14:31:29.381: E/WindowManager(10287): at android.os.Handler.dispatchMessage(Handler.java:92)
04-07 14:31:29.381: E/WindowManager(10287): at android.os.Looper.loop(Looper.java:130)
04-07 14:31:29.381: E/WindowManager(10287): at android.app.ActivityThread.main(ActivityThread.java:3835)
04-07 14:31:29.381: E/WindowManager(10287): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 14:31:29.381: E/WindowManager(10287): at java.lang.reflect.Method.invoke(Method.java:507)
04-07 14:31:29.381: E/WindowManager(10287): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
04-07 14:31:29.381: E/WindowManager(10287): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
04-07 14:31:29.381: E/WindowManager(10287): at dalvik.system.NativeStart.main(Native Method)
非常感谢！
推荐答案
窗口泄漏不是崩溃的根本原因；这里的主要问题是您试图从后台线程创建对话框:
The window leak is not the root cause of your crash; the primary problem here is that you're trying to create a dialog from a background thread:
由以下原因引起:java.lang.RuntimeException:无法在尚未调用Looper.prepare()的线程内创建处理程序.
Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
在AlertBox中，您正在创建一个新对话框，该对话框又包含其自己的Handler:
In AlertBox, you're creating a new dialog, which in turn contain their own Handler:
new AlertDialog.Builder(context)
[...]
.show();
但是，您是通过AsyncTask的doInBackground()创建的AlertBox:
However, you're creating AlertBox from your AsyncTask's doInBackground():
new AlertBox(context, "Error", e.toString());
例如通过处理onPostExecute()中的错误，将该逻辑移入主线程.
Move that logic into the main thread, for instance by handling the error in onPostExecute().
其次，您收到窗口泄漏"消息，因为活动消失时AsyncTask仍在运行，并且它包含对该窗口附加的对象的引用，特别是pDialog.
Secondarily, you're getting the "window leaked" message because the AsyncTask is still running while the activity is gone, and it contains references to objects attached to that window, specifically pDialog.
这篇关于警报对话框导致窗口泄漏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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