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POHow to fix null sending message to a Handler on a dead thread warning?
 

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  1. POHow to fix null sending message to a Handler on a dead thread warning?
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    <p>I have a thread using handler and messages to send data to the activity. Everything work fine except when the activity is paused :</p> <pre><code>null sending message to a Handler on a dead thread java.lang.RuntimeException: null sending message to a Handler on a dead thread at android.os.MessageQueue.enqueueMessage(MessageQueue.java:196) at android.os.Looper.quit(Looper.java:173) at pocket.net.ComD.stopConnection(ComD.java:154) at pocket.net.ComD.finalize(ComD.java:184) at dalvik.system.NativeStart.run(Native Method) </code></pre> <p>In my activity , i have the following code which lets me close all the network connection opened by the thread : </p> <pre><code>public void onPause() { if(this.myThread != null) { this.myThread.stopConnection(); } } </code></pre> <p>In my Thread : </p> <pre><code>public void run() { this.setName("MessagesThread"); if(this.initSocket()) { Looper.prepare(); this.threadHandler = initHandler(); Looper.loop(); } else { this.timeout(); } } public void stopConnection() { if(this.threadHandler != null) { this.threadHandler.removeMessages(ALIVE); // Remove a delayed message this.threadHandler.getLooper().quit(); // Warning } this.connected = false; if(this.client != null) { this.client.close(); } } private Handler initHandler() { return new Handler() { public void handleMessage(Message msg) { switch(msg.what) { //Handling messages } } } } </code></pre> <p>When i receive the warning "null sending message to a Handler on a dead thread" is that the activity trying to send a message to the thread or the oppposite ?</p> <p>How can i fix this ?</p> <p>Thanks</p>
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    1. COI thought you wanted to send data from the worker thread to the activity (UI thread)? If so, shouldn't the `Handler` be in the `Activity` while the worker thread `sendMessage` to it? Sorry if I misunderstood your logic
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    2. COThe worker thread send data to the activity indeed. But the activity ask this data (and other stuff) to the worker thread. So both of them have handler and messages
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