我知道已经有很多这样的问题,但是我看不出我做错了什么.该应用程序崩溃,但未显示任何内容.另外,该错误不会在我的设备或仿真器上发生.仅在某些设备上(例如30-40％？).
无法在未调用Looper.prepare()的线程内创建处理程序
MainActivity.java
public class MainActivity extends Activity implements Runnable {Gebruiker gebruiker = new Gebruiker();private DatabaseHelper db;Context context;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.activity_main); context = this; if(isOnline()){ downloadData(); } else { AlertDialog.Builder builder = new AlertDialog.Builder(context); builder.setMessage("Deze app vereist een actIEve verbinding met het internet!") .setCancelable(false) .setPositivebutton("OK", new DialogInterface.OnClickListener() { public voID onClick(DialogInterface dialog, int ID) { androID.os.Process.killProcess(androID.os.Process.myPID()); } }); AlertDialog alert = builder.create(); alert.show(); } db = new DatabaseHelper(this);}@OverrIDepublic boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true;}private ProgressDialog pDialog;public voID downloadData() { pDialog = ProgressDialog.show(this, "Controleren op bestaande gebruiker..", "Even geduld", true, false); Thread thread = new Thread(this); thread.start();}public voID run() { // add downloading code here httpReader httpReader = new httpReader(); String url = "*****"; url += Secure.getString(getApplicationContext().getContentResolver(), Secure.ANDROID_ID); JsonHelper JsonHelper = new JsonHelper(); gebruiker = JsonHelper.getGebruiker((httpReader.getTextFromUrl(url) .trim())); handler.sendEmptyMessage(0);}private Handler handler = new Handler() { @OverrIDe public voID handleMessage(Message msg) { pDialog.dismiss(); if (gebruiker == null) { // ga naar aanmaken gebruiker Intent intent = new Intent(MainActivity.this, AanmakenUser.class); startActivity(intent); } else { // ga naar hoofdmenu db.droppen(); db.insertGebruiker(gebruiker); Intent intent = new Intent(MainActivity.this, Hoofdmenu.class); startActivity(intent); // ga naar menu } }};public boolean isOnline() { ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getActiveNetworkInfo(); if (netInfo != null && netInfo.isConnectedOrConnecting()) { return true; } return false;}logcat的
01-10 16:12:16.444: E/AndroIDRuntime(6090): FATAL EXCEPTION: Thread-1001-10 16:12:16.444: E/AndroIDRuntime(6090): java.lang.ExceptionInInitializerError01-10 16:12:16.444: E/AndroIDRuntime(6090): at db.jochen.quizapp.MainActivity.run(MainActivity.java:68)01-10 16:12:16.444: E/AndroIDRuntime(6090): at java.lang.Thread.run(Thread.java:1019)01-10 16:12:16.444: E/AndroIDRuntime(6090): Caused by: java.lang.RuntimeException: Can't create handler insIDe thread that has not called Looper.prepare()01-10 16:12:16.444: E/AndroIDRuntime(6090): at androID.os.Handler.<init>(Handler.java:121)01-10 16:12:16.444: E/AndroIDRuntime(6090): at androID.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)01-10 16:12:16.444: E/AndroIDRuntime(6090): at androID.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)01-10 16:12:16.444: E/AndroIDRuntime(6090): at androID.os.AsyncTask.<clinit>(AsyncTask.java:152)01-10 16:12:16.444: E/AndroIDRuntime(6090): ... 2 more01-10 16:12:16.454: D/dalvikvm(6090): GC_CONCURRENT freed 79K, 48% free 2843K/5379K, external 3695K/4614K, paused 2ms+5ms01-10 16:12:16.454: W/ActivityManager(278): Force finishing activity db.jochen.quizapp/.MainActivity01-10 16:12:16.544: E/SkLayout_wtle(6090): ellipsis Failed line number does not match 1 001-10 16:12:16.624: D/fast-dormancy(165): [FDM]: finish the match exclude List procedure, but can not match any one01-10 16:12:16.624: D/fast-dormancy(165): [FDM]: Godormant? 001-10 16:12:16.624: D/fast-dormancy(165): [FDM]: Threads Status Mutex Locked in fdm_main_loop01-10 16:12:16.624: D/fast-dormancy(165): [FDM]: Threads Status Mutex Unlocked in fdm_main_loop01-10 16:12:16.624: D/fast-dormancy(165): [FDM]: finish the match exclude List procedure, but can not match any one01-10 16:12:16.624: D/fast-dormancy(165): [FDM]: Godormant? 001-10 16:12:16.624: D/fast-dormancy(165): [FDM]: Threads Status Mutex Locked in fdm_main_loop01-10 16:12:16.624: D/fast-dormancy(165): [FDM]: Threads Status Mutex Unlocked in fdm_main_loop01-10 16:12:16.624: I/ActivityManager(278): No longer want com.sonyeriCSSon.tvlauncher (pID 4961): hIDden #1601-10 16:12:16.664: E/WindowManager(6090): Activity db.jochen.quizapp.MainActivity has leaked window com.androID.internal.policy.impl.PhoneWindow$DecorVIEw@2afd4aa0 that was originally added here01-10 16:12:16.664: E/WindowManager(6090): androID.vIEw.WindowLeaked: Activity db.jochen.quizapp.MainActivity has leaked window com.androID.internal.policy.impl.PhoneWindow$DecorVIEw@2afd4aa0 that was originally added here01-10 16:12:16.664: E/WindowManager(6090): at androID.vIEw.VIEwRoot.<init>(VIEwRoot.java:269)01-10 16:12:16.664: E/WindowManager(6090): at androID.vIEw.WindowManagerImpl.addVIEw(WindowManagerImpl.java:148)01-10 16:12:16.664: E/WindowManager(6090): at androID.vIEw.WindowManagerImpl.addVIEw(WindowManagerImpl.java:91)01-10 16:12:16.664: E/WindowManager(6090): at androID.vIEw.Window$LocalWindowManager.addVIEw(Window.java:424)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.Dialog.show(Dialog.java:241)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.ProgressDialog.show(ProgressDialog.java:109)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.ProgressDialog.show(ProgressDialog.java:97)01-10 16:12:16.664: E/WindowManager(6090): at db.jochen.quizapp.MainActivity.downloadData(MainActivity.java:59)01-10 16:12:16.664: E/WindowManager(6090): at db.jochen.quizapp.MainActivity.onCreate(MainActivity.java:33)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:1623)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.ActivityThread.access00(ActivityThread.java:121)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:943)01-10 16:12:16.664: E/WindowManager(6090): at androID.os.Handler.dispatchMessage(Handler.java:99)01-10 16:12:16.664: E/WindowManager(6090): at androID.os.Looper.loop(Looper.java:138)01-10 16:12:16.664: E/WindowManager(6090): at androID.app.ActivityThread.main(ActivityThread.java:3701)01-10 16:12:16.664: E/WindowManager(6090): at java.lang.reflect.Method.invokeNative(Native Method)01-10 16:12:16.664: E/WindowManager(6090): at java.lang.reflect.Method.invoke(Method.java:507)01-10 16:12:16.664: E/WindowManager(6090): at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)01-10 16:12:16.664: E/WindowManager(6090): at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:636)01-10 16:12:16.664: E/WindowManager(6090): at dalvik.system.NativeStart.main(Native Method)解决方法:
如果您的线程不在监听循环程序,您如何管理发送给处理程序的请求？
Doc说：
公共处理程序()
在API级别1中添加
默认构造函数将此处理程序与当前线程的Looper关联.如果此线程没有循环程序,则此处理程序将无法接收消息,因此将引发异常.
如果希望辅助线程能够管理Handler,则必须调用Looper.prepare()
例：
public class MyThread extends Thread { private Handler mHandler; public voID run() { Looper.prepare(); mHandler = new Handler() { @OverrIDe public voID handleMessage(Message msg) { switch (msg.what) { // manage the message } } }; Looper.loop(); } public voID stopLooper() { if (Looper.myLooper()!=null) Looper.myLooper().quitSafely(); }}以上是内存溢出为你收集整理的java-无法在某些设备上尚未调用Looper.prepare()的线程内创建处理程序全部内容，希望文章能够帮你解决java-无法在某些设备上尚未调用Looper.prepare()的线程内创建处理程序所遇到的程序开发问题。
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