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Updating UI from webview's Javascript Interface crashes the app

Tags:

javascript

android

webview

I'm working on a hybrid webview/native app and am running into an issue where the app crashes.

Here's the quick rundown:

  • app is in a single FrameLayout
  • the top has a LinearLayout where I place a button to on the left & right sides and my app's logo in the middle & below that I have my WebView
  • I'm using webview.addJavascriptInterface(myObj, "myJsName") to attach a JS interface to the web view
  • in the webView I load a simple HTML page that calls public methods in my JS interface. These methods just show or hide the various View in the faux "title bar" (the LineadLayout)
  • the methods in my JS interface are called just fine - but if i try to update the UI in those calls the app crashes with a Fatal signal 11 (SIGSEGV)

Here's the relevant code from my activity:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);

    webview = (WebView) findViewById(R.id.webview);
    logo = (ImageView) findViewById(R.id.logo);

    webview.getSettings().setJavaScriptEnabled(true);
    webview.getSettings().setLightTouchEnabled(true);
    webview.getSettings().setEnableSmoothTransition(true);

    javascriptInterface = new JavascriptInterface() {
        public void showLogo() {
            runOnUiThread(new Runnable() {
                public void run() {
                    MyActivity.this.logo.setVisibility(View.VISIBLE);
                }
            });
        }

        public void hideLogo() {
            MyActivity.this.runOnUiThread( new Runnable() {
                public void run() {
                    MyActivity.this.logo.setVisibility(View.GONE);
                }
            });
        }
    };
    webview.addJavascriptInterface(javascriptInterface, JavascriptInterface.NAME);
    webview.loadUrl("file:///android_asset/test.html");
}
  • When calling hideLogo() from my JS code the app crashes with Fatal signal 11 (SIGSEGV).
  • if i remove the MyActivity.this.runOnUiThread and just try to modify the UI nothing happens (no crash either)
  • when debugging I have assured that the logo variable is not null and indeed represents the correct ImageView
  • also, upon calling hideLogo() the logo does disappear right before the app crashes

So, now I'm really confused. I've tried using a Handler and an AsycTask & both give me the same type of crash.

I'm super new to Android so I'm hoping I'm doing something stupid here. Any and all help is appreciated!

update here's verbose output from log cat

10-01 12:29:55.591: INFO/Choreographer(10074): Skipped 74 frames!  The application may be doing too much work on its main thread.
10-01 12:29:55.622: null/libc(10074): Fatal signal 11 (SIGSEGV) at 0x00000008 (code=1), thread 10074 (com.arin.test)
10-01 12:29:55.724: INFO/DEBUG(121): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
10-01 12:29:55.724: INFO/DEBUG(121): Build fingerprint: 'google/takju/maguro:4.1.1/JRO03C/398337:user/release-keys'
10-01 12:29:55.724: INFO/DEBUG(121): pid: 10074, tid: 10074, name: com.arin.test  >>> com.arin.test <<<
10-01 12:29:55.724: INFO/DEBUG(121): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000008
10-01 12:29:55.849: INFO/DEBUG(121): r0 00000008  r1 5bc3ebc0  r2 00000010  r3 00000004
10-01 12:29:55.849: INFO/DEBUG(121): r4 5a52d008  r5 5a52de38  r6 00000001  r7 00000004
10-01 12:29:55.849: INFO/DEBUG(121): r8 00000008  r9 00000001  sl 00000004  fp 00000001
10-01 12:29:55.849: INFO/DEBUG(121): ip 00000001  sp bedb2310  lr 5bea188c  pc 5beca774  cpsr 80000010
10-01 12:29:55.849: INFO/DEBUG(121): d0  00000000bd0d3d00  d1  3f8469ee00000000
10-01 12:29:55.849: INFO/DEBUG(121): d2  0000000000000080  d3  000000000000003f
10-01 12:29:55.849: INFO/DEBUG(121): d4  0000000000000000  d5  000000003f800000
10-01 12:29:55.849: INFO/DEBUG(121): d6  3f8469eebd0d3dcb  d7  3f8000003f800000
10-01 12:29:55.849: INFO/DEBUG(121): d8  bf800000bf800000  d9  0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d10 0000000000000000  d11 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d12 0000000000000000  d13 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d14 0000000000000000  d15 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d16 0000000000000008  d17 000000c1417d8568
10-01 12:29:55.849: INFO/DEBUG(121): d18 000000000358b208  d19 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d20 0000000000000000  d21 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d22 0000000000000000  d23 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d24 3fee45a1e2e00000  d25 4000000006800000
10-01 12:29:55.849: INFO/DEBUG(121): d26 0000000000000000  d27 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d28 408d900000000000  d29 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): d30 bffffffff8a00000  d31 0000000000000000
10-01 12:29:55.849: INFO/DEBUG(121): scr 20000010
10-01 12:29:55.849: INFO/DEBUG(121): backtrace:
10-01 12:29:55.849: INFO/DEBUG(121): #00  pc 00034774  /system/vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
10-01 12:29:55.849: INFO/DEBUG(121): #01  pc 0000b888  /system/vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
10-01 12:29:55.849: INFO/DEBUG(121): stack:
10-01 12:29:55.849: INFO/DEBUG(121): bedb22d0  03d00000
10-01 12:29:55.849: INFO/DEBUG(121): bedb22d4  00000000
10-01 12:29:55.849: INFO/DEBUG(121): bedb22d8  5a4defc8
10-01 12:29:55.849: INFO/DEBUG(121): bedb22dc  5a5316c0
10-01 12:29:55.849: INFO/DEBUG(121): bedb22e0  5a52dee4
10-01 12:29:55.849: INFO/DEBUG(121): bedb22e4  00000008
10-01 12:29:55.849: INFO/DEBUG(121): bedb22e8  00000002
10-01 12:29:55.849: INFO/DEBUG(121): bedb22ec  00000004
10-01 12:29:55.849: INFO/DEBUG(121): bedb22f0  5a52dee4
10-01 12:29:55.849: INFO/DEBUG(121): bedb22f4  5a52d008
10-01 12:29:55.849: INFO/DEBUG(121): bedb22f8  5a52de34
10-01 12:29:55.849: INFO/DEBUG(121): bedb22fc  00000000
10-01 12:29:55.849: INFO/DEBUG(121): bedb2300  00000004
10-01 12:29:55.849: INFO/DEBUG(121): bedb2304  00000023
10-01 12:29:55.849: INFO/DEBUG(121): bedb2308  df0027ad
10-01 12:29:55.849: INFO/DEBUG(121): bedb230c  00000000
10-01 12:29:55.849: INFO/DEBUG(121): #00  bedb2310  5a52d008
10-01 12:29:55.849: INFO/DEBUG(121): ........  ........
10-01 12:29:55.849: INFO/DEBUG(121): #01  bedb2310  5a52d008
10-01 12:29:55.849: INFO/DEBUG(121): bedb2314  5bea188c  /system/vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
10-01 12:29:55.849: INFO/DEBUG(121): bedb2318  5a52d008
10-01 12:29:55.849: INFO/DEBUG(121): bedb231c  00000004
10-01 12:29:55.849: INFO/DEBUG(121): bedb2320  00000004
10-01 12:29:55.849: INFO/DEBUG(121): bedb2324  00000000
10-01 12:29:55.849: INFO/DEBUG(121): bedb2328  00000005
10-01 12:29:55.849: INFO/DEBUG(121): bedb232c  5bea398c  /system/vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
10-01 12:29:55.849: INFO/DEBUG(121): bedb2330  5a52d008
10-01 12:29:55.849: INFO/DEBUG(121): bedb2334  00000004
10-01 12:29:55.849: INFO/DEBUG(121): bedb2338  00000000
10-01 12:29:55.849: INFO/DEBUG(121): bedb233c  5bef106c  /system/vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
10-01 12:29:55.849: INFO/DEBUG(121): bedb2340  00000005
10-01 12:29:55.849: INFO/DEBUG(121): bedb2344  5bea4a70  /system/vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so (glDrawArrays+804)
10-01 12:29:55.849: INFO/DEBUG(121): bedb2348  00000004
10-01 12:29:55.849: INFO/DEBUG(121): bedb234c  00000000
10-01 12:29:55.849: INFO/DEBUG(121): memory near r1:
10-01 12:29:55.849: INFO/DEBUG(121): 5bc3eba0 ffffffff ffffffff ffffffff ffffffff  ................
10-01 12:29:55.849: INFO/DEBUG(121): 5bc3ebb0 ffffffff ffffffff ffffffff ffffffff  ................
10-01 12:29:55.849: INFO/DEBUG(121): 5bc3ebc0 ffffffff ffffffff ffffffff ffffffff  ................
10-01 12:29:55.849: INFO/DEBUG(121): 5bc3ebd0 ffffffff ffffffff ffffffff ffffffff  ................
10-01 12:29:55.849: INFO/DEBUG(121): 5bc3ebe0 ffffffff ffffffff ffffffff ffffffff  ................
10-01 12:29:55.849: INFO/DEBUG(121): memory near r4:
10-01 12:29:55.849: INFO/DEBUG(121): 5a52cfe8 5a525fe0 00000001 00000000 00000007  ._RZ............
10-01 12:29:55.849: INFO/DEBUG(121): 5a52cff8 00000007 00000007 00000000 00000f9b  ................
10-01 12:29:55.849: INFO/DEBUG(121): 5a52d008 00000018 0000e7f4 00001c80 00001100  ................
10-01 12:29:55.849: INFO/DEBUG(121): 5a52d018 00001100 0000000a 00000428 00000048  ........(...H...
10-01 12:29:55.849: INFO/DEBUG(121): 5a52d028 0000003c 00000048 0000003c 00000004  <...H...<.......
10-01 12:29:55.849: INFO/DEBUG(121): memory near r5:
10-01 12:29:55.849: INFO/DEBUG(121): 5a52de18 00000000 00000000 00000000 00000000  ................
10-01 12:29:55.849: INFO/DEBUG(121): 5a52de28 00000000 00000000 5a52dc0c 5a52dcb4  ..........RZ..RZ
10-01 12:29:55.849: INFO/DEBUG(121): 5a52de38 5a52dce4 00000000 00000000 00000000  ..RZ............
10-01 12:29:55.849: INFO/DEBUG(121): 5a52de48 00000000 00000000 00000000 00000000  ................
10-01 12:29:55.849: INFO/DEBUG(121): 5a52de58 00000002 00000003 00000003 00000004  ................
10-01 12:29:55.849: INFO/DEBUG(121): memory near sp:
10-01 12:29:55.849: INFO/DEBUG(121): bedb22f0 5a52dee4 5a52d008 5a52de34 00000000  ..RZ..RZ4.RZ....
10-01 12:29:55.849: INFO/DEBUG(121): bedb2300 00000004 00000023 df0027ad 00000000  ....#....'......
10-01 12:29:55.849: INFO/DEBUG(121): bedb2310 5a52d008 5bea188c 5a52d008 00000004  ..RZ...[..RZ....
10-01 12:29:55.849: INFO/DEBUG(121): bedb2320 00000004 00000000 00000005 5bea398c  .............9.[
10-01 12:29:55.849: INFO/DEBUG(121): bedb2330 5a52d008 00000004 00000000 5bef106c  ..RZ........l..[
10-01 12:29:55.849: INFO/DEBUG(121): code around pc:
10-01 12:29:55.849: INFO/DEBUG(121): 5beca754 e781410c e28cc001 e15c0003 3afffffa  .A........\....:
10-01 12:29:55.849: INFO/DEBUG(121): 5beca764 e8bd8010 e92d4010 e3a0c000 ea000004  .....@-.........
10-01 12:29:55.849: INFO/DEBUG(121): 5beca774 e5904000 e5014008 e5904004 e0800002  .@...@...@......
10-01 12:29:55.849: INFO/DEBUG(121): 5beca784 e5014004 e15c0003 e2811008 e28cc001  .@....\.........
10-01 12:29:55.849: INFO/DEBUG(121): 5beca794 3afffff6 e8bd8010 e92d4010 e3a0c000  ...:.....@-.....
10-01 12:29:55.856: INFO/DEBUG(121): code around lr:
10-01 12:29:55.856: INFO/DEBUG(121): 5bea186c e3530000 1a000005 e1a03007 e59c0018  ..S......0......
10-01 12:29:55.856: INFO/DEBUG(121): 5bea187c e59c101c e59c2014 e1a0e00f e59cf024  ..... ......$...
10-01 12:29:55.856: INFO/DEBUG(121): 5bea188c e2866001 e2855004 e5942e50 e3a03001  .`...P..P....0..
10-01 12:29:55.856: INFO/DEBUG(121): 5bea189c e1560002 3affffeb e2840eed e1a01008  ..V....:........
10-01 12:29:55.856: INFO/DEBUG(121): 5bea18ac e280000c e1a02003 e8bd41f0 eaffe178  ..... ...A..x...
10-01 12:29:56.060: INFO/WindowState(321): WIN DEATH: Window{425993f8 com.arin.test/com.arin.test paused=false}
10-01 12:29:56.060: INFO/ActivityManager(321): Process com.arin.test (pid 10074) has died.
10-01 12:29:56.060: WARN/ActivityManager(321): Force removing ActivityRecord{4226e5d0 com.arin.test/com.arin.test}: app died, no saved state
10-01 12:29:56.099: DEBUG/Zygote(124): Process 10074 terminated by signal (11)
10-01 12:29:56.161: WARN/InputMethodManagerService(321): Got RemoteException sending setActive(false) notification to pid 10074 uid 10008
like image 279
phatduckk Avatar asked Mar 06 '26 09:03

phatduckk

1 Answers

I was having the same issue. Using a Handler fixed it:

class MyJavaScriptInterface   
    {  
        // gets called from JavasScript
        @SuppressWarnings("unused")  
        public void notifyStarted()  
        {  
            _handler.post(_onNavigationStarted);
        }  
    } 

    final Handler _handler = new Handler();

    final Runnable _onNavigationStarted = new Runnable() {
        public void run() {
            _me.navigationStarted();
        }
    };

    protected void navigationStarted() {
        _btnNavigate.setEnabled(true);
        _btnNavigate.setText(_me.getResources().getString(R.string.Navigate));
    }
like image 137
Abdo Avatar answered Mar 08 '26 21:03

Abdo
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