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How to prevent my Android application from closing?

There are four buttons in the user interface of my application, of which three buttons (when pressed) extract the image from mysql db and display it on the Android phone. The fourth task of the button is to get text from db.

if any of the buttons that extract the image first clicked the image, and then if the button that extracts the image is pressed, text is displayed.

But when the button that extracts the text is pressed first, even before the button that displays the image is pressed, the power of the application closes!

the code for the onClick activity of the button that retrieves the text is as follows

b.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { Toast.LENGTH_SHORT).show(); try { data.put("id",id); } catch (JSONException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } String url="http://10.0.2.2:8080/finder/review/listA"; try { img.setImageBitmap(null); json =HTTPPoster.doPost(url, data); Toast.makeText(getBaseContext(),json.toString(), Toast.LENGTH_SHORT).show(); titles=json.getJSONObject("titles"); Toast.makeText(getBaseContext(), titles.toString(), Toast.LENGTH_SHORT).show(); msgs=json.getJSONObject("msgs"); names=json.getJSONObject("names"); String one=titles.getString("0"); Toast.makeText(getBaseContext(), one.toString(),Toast.LENGTH_LONG).show(); t.setText("\nReviews \n"); String content=""; for(int i=0;i<3;i++) { String msg=msgs.getString(i+""); name=names.getString(i+""); String title=titles.getString(i+""); content=t.getText()+("\n Name"+name+"\n Title: "+title+"\n Msg:"+msg); t.setText(content); Toast.makeText(getBaseContext(),"Name:"+name+"\n Title: "+title+"\n Message"+msg,Toast.LENGTH_SHORT).show(); } // t.setText() } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } });

logcat

 06-07 00:25:29.923: INFO/Process(234): Sending signal. PID: 234 SIG: 9 06-07 00:25:30.042: INFO/WindowManager(58): WIN DEATH: Window{44e66ef0 com.lpss/com.lpss.MyList paused=false} 06-07 00:25:30.053: INFO/WindowManager(58): WIN DEATH: Window{44d72da0 com.lpss/com.lpss.lpss paused=false} 06-07 00:25:30.053: INFO/ActivityManager(58): Process com.lpss (pid 234) has died. 06-07 00:25:30.062: WARN/GpsLocationProvider(58): Unneeded remove listener for uid 1000 06-07 00:25:30.062: DEBUG/GpsLocationProvider(58): stopNavigating 06-07 00:25:30.062: INFO/WindowManager(58): WIN DEATH: Window{44dedb10 Toast paused=false} 06-07 00:25:30.091: WARN/ActivityManager(58): Scheduling restart of crashed service com.lpss/.NotifyService in 5000ms 06-07 00:25:30.103: INFO/WindowManager(58): WIN DEATH: Window{44dd9490 com.lpss/com.lpss.Contents paused=false} 06-07 00:25:30.244: INFO/ActivityManager(58): Start proc com.lpss for activity com.lpss/.MyList: pid=248 uid=10030 gids={3003, 1015} 06-07 00:25:30.244: ERROR/ActivityThread(58): Failed to find provider info for android.server.checkin 06-07 00:25:30.244: WARN/Checkin(58): Can't log event SYSTEM_SERVICE_LOOPING: java.lang.IllegalArgumentException: Unknown URL content://android.server.checkin/events 06-07 00:25:30.743: DEBUG/ddm-heap(248): Got feature list request 06-07 00:25:30.912: INFO/UsageStats(58): Unexpected resume of com.lpss while already resumed in com.lpss 06-07 00:25:31.443: WARN/InputManagerService(58): Got RemoteException sending setActive(false) notification to pid 234 uid 10030 06-07 00:25:31.603: INFO/ActivityManager(58): Displayed activity com.lpss/.MyList: 1487 ms (total 1487 ms) 06-07 00:25:31.713: WARN/NotificationService(58): Object died trying to hide notification android.app.ITransientNotification$Stub$Proxy@44de2548 in package com.lpss 06-07 00:25:31.713: WARN/ActivityManager(58): setProcessForeground called on unknown pid: 234 06-07 00:25:31.723: WARN/NotificationService(58): Object died trying to show notification android.app.ITransientNotification$Stub$Proxy@44de2c70 in package com.lpss 06-07 00:25:31.723: WARN/ActivityManager(58): setProcessForeground called on unknown pid: 234 06-07 00:25:31.723: WARN/NotificationService(58): Object died trying to show notification android.app.ITransientNotification$Stub$Proxy@44dd78a0 in package com.lpss 06-07 00:25:31.723: WARN/ActivityManager(58): setProcessForeground called on unknown pid: 234 06-07 00:25:31.723: WARN/NotificationService(58): Object died trying to show notification android.app.ITransientNotification$Stub$Proxy@44dd7fc8 in package com.lpss 06-07 00:25:31.723: WARN/ActivityManager(58): setProcessForeground called on unknown pid: 234 06-07 00:41:25.262: DEBUG/dalvikvm(58): GC freed 19490 objects / 957584 bytes in 209ms

which retrieves the image

 b3.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { try { data.put("name",name); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } String url="http://10.0.2.2:8080/finder/place/ph?id="+id; // json =HTTPPoster.doPost(url, data); downloadImage(url); // Toast.makeText(this,json.toString() , Toast.LENGTH_SHORT).show(); } }); b4.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { t.setText(""); try { data.put("name",name); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } String url="http://10.0.2.2:8080/finder/place/map?id="+id; // json =HTTPPoster.doPost(url, data); downloadImage(url); // Toast.makeText(this,json.toString() , Toast.LENGTH_SHORT).show(); } });
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1 answer

My feeling is a null pointer error. What I would do is surround the entire method in a large try{} catch (Throwable t) {} .

Then print the stack trace and error message. The fact is that you have to debug the code step, since System.out.println () does not do much in android.

(aside: in android, I'm used to using Log.v () or something similar for throwaway debugging code, where you used sysout on other platforms)

Or you can try the android framework with something like:

 catch (Throwable t) { Log.v("Ric_TEST", t.getMessage(); }

Then you can search your logarithmic load for the word "Ric_TEST". Alternatively (if you are using Eclipse), you can filter the output of logcat by entering the tag text.

Another similar way is to connect to your device using adb (adb logcat -v time), and you can look at the log and see the stack trace when the application crashes.

Pls remark: as soon as you find the error, delete the try..catch block that I mentioned - I only speak for it as a tool to find the error.

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Source: https://habr.com/ru/post/1384542/

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