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POUpdating UI from webview's Javascript Interface crashes the app
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copied!<p>I'm working on a hybrid webview/native app and am running into an issue where the app crashes.</p> <p>Here's the quick rundown:</p> <ul> <li>app is in a single FrameLayout</li> <li>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</li> <li>I'm using <code>webview.addJavascriptInterface(myObj, "myJsName")</code> to attach a JS interface to the web view</li> <li>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)</li> <li>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 <code>Fatal signal 11 (SIGSEGV)</code> </li> </ul> <p>Here's the relevant code from my activity:</p> <pre><code>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"); } </code></pre> <ul> <li>When calling <code>hideLogo()</code> from my JS code the app crashes with <code>Fatal signal 11 (SIGSEGV)</code>. </li> <li>if i remove the <code>MyActivity.this.runOnUiThread</code> and just try to modify the UI nothing happens (no crash either)</li> <li>when debugging I have assured that the <code>logo</code> variable is not null and indeed represents the correct ImageView</li> <li>also, upon calling <code>hideLogo()</code> the logo does disappear right before the app crashes</li> </ul> <p>So, now I'm really confused. I've tried using a <code>Handler</code> and an <code>AsycTask</code> & both give me the same type of crash.</p> <p>I'm super new to Android so I'm hoping I'm doing something stupid here. Any and all help is appreciated!</p> <p><em>update here's verbose output from log cat</em></p> <pre><code>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 </code></pre>

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