When I invoke a Java function from my Javascript code, WebView crashes. Why?
This is probably an easy question. When I invoke a Java function from my Javascript code, WebView crashes. Why? This code is straight from the docs.
Java:
public class HelloWebView extends Activity {
private WebView mWebView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mWebView = (WebView) findViewById(R.id.webview);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.addJavascriptInterface(new JavaScriptInterface(this), "Android");
mWebView.loadUrl("file:///android_asset/myPage.html");
}
public class JavaScriptInterface {
Context mContext;
JavaScriptInterface(Context c) {
mContext = c;
}
public void showToast(String toast) {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
}
}
}
HTML:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">
<html>
<head>
<script type="text/javascript">
function showAndroidToast(toast) {
Android.showToast(toast);
}
</script>
</head>
<body>
<input type="button" value="Say hello"
onClick="showAndroidToast('Hello Android!')" />
</body>
I'm sure I'm just missing something absolutely basic, because I haven't found anyone else with this problem.
By the way, I'm using Android API 10, Gingerbread 2.3.3, and running it on an emulator. Everything loads and works fine. I just run into problems when I click the button which crashes WebView and my entire application.
What am I not understanding here?
Logcat:
09-01 09:49:44.955: INFO/System.out(366): debugger has settled (1459)
09-01 09:49:46.696: INFO/ActivityManager(60): Displayed com.hello/.HelloWebView: +5s498ms
09-01 09:49:49.506: WARN/dalvikvm(366): JNI WARNING: jarray 0x40542240 points to non-array object (Ljava/lang/String;)
09-01 09:49:49.526: INFO/dalvikvm(366): "WebViewCoreThread" prio=5 tid=9 NATIVE
09-01 09:49:49.526: INFO/dalvikvm(366): | group="main" sCount=0 dsCount=0 obj=0x4051db40 self=0x29e2c0
09-01 09:49:49.536: INFO/dalvikvm(366): | sysTid=375 nice=0 sched=0/0 cgrp=default handle=2745336
09-01 09:49:49.536: INFO/dalvikvm(366): | schedstat=( 765703801 1439331689 114 )
09-01 09:49:49.536: INFO/dalvikvm(366): at android.webkit.WebViewCore.nativeTouchUp(Native Method)
09-01 09:49:49.546: INFO/dalvikvm(366): at android.webkit.WebViewCore.nativeTouchUp(Native Method)
09-01 09:49:49.546: INFO/dalvikvm(366): at android.webkit.WebViewCore.access$3300(WebViewCore.java:53)
09-01 09:49:49.546: INFO/dalvikvm(366): at android.webkit.WebViewCore$EventHub$1.handleMessage(WebViewCore.java:1158)
09-01 09:49:49.546: INFO/dalvikvm(366): at android.os.Handler.dispatchMessage(Handler.java:99)
09-01 09:49:49.546: INFO/dalvikvm(366): at android.os.Looper.loop(Looper.java:123)
09-01 09:49:49.546: INFO/dalvikvm(366): at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:629)
09-01 09:49:49.556: INFO/dalvikvm(366): at java.lang.Thread.run(Thread.java:1019)
09-01 09:49:49.616: ERROR/dalvikvm(366): VM aborting
09-01 09:49:49.726: INFO/DEBUG(30): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
09-01 09:49:49.726: INFO/DEBUG(30): Build fingerprint: 'generic/sdk/generic:2.3.3/GRI34/101070:eng/test-keys'
09-01 09:49:49.726: INFO/DEBUG(30): pid: 366, tid: 375 >>> com.hello <<<
09-01 09:49:49.726: INFO/DEBUG(30): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr deadd00d
09-01 09:49:49.726: INFO/DEBUG(30): r0 fffffec4 r1 deadd00d r2 00000026 r3 00000000
09-01 09:49:49.726: INFO/DEBUG(30): r4 800a45c0 r5 40542240 r6 80085acc r7 0029ecf0
09-01 09:49:49.726: INFO/DEBUG(30): r8 44091afc r9 43f2fe4c 10 00000000 fp 41a4e2e0
09-01 09:49:49.726: INFO/DEBUG(30): ip 800a4720 sp 440912f0 lr afd19375 pc 80045a4a cpsr 20000030
09-01 09:49:49.925: INFO/DEBUG(30): #00 pc 00045a4a /system/lib/libdvm.so
09-01 09:49:49.925: INFO/DEBUG(30): #01 pc 00037748 /system/lib/libdvm.so
09-01 09:49:49.925: INFO/DEBUG(30): #02 pc 00039a10 /system/lib/libdvm.so
09-01 09:49:49.935: INFO/DEBUG(30): #03 pc 0003a4ec /system/lib/libdvm.so
09-01 09:49:49.935: INFO/DEBUG(30): #04 pc 002989d6 /system/lib/libwebcore.so
09-01 09:49:49.945: INFO/DEBUG(30): #05 pc 002120a4 /system/lib/libwebcore.so
09-01 09:49:49.945: INFO/DEBUG(30): #06 pc 00113216 /system/lib/libwebcore.so
09-01 09:49:49.945: INFO/DEBUG(30): #07 pc 00212b70 /system/lib/libwebcore.so
09-01 09:49:49.955: INFO/DEBUG(30): #08 pc 002c716e /system/lib/libwebcore.so
09-01 09:49:49.955: INFO/DEBUG(30): #09 pc 002ca4c6 /system/lib/libwebcore.so
09-01 09:49:49.965: INFO/DEBUG(30): #10 pc 002d83b0 /system/lib/libwebcore.so
09-01 09:49:49.965: INFO/DEBUG(30): #11 pc 002cfae8 /system/lib/libwebcore.so
09-01 09:49:49.965: INFO/DEBUG(30): #12 pc 0020ce24 /system/lib/libwebcore.so
09-01 09:49:49.976: INFO/DEBUG(30): #13 pc 001a0966 /system/lib/libwebcore.so
09-01 09:49:49.976: INFO/DEBUG(30): #14 pc 001a6ef4 /system/lib/libwebcore.so
09-01 09:49:49.985: INFO/DEBUG(30): #15 pc 001a4cd4 /system/lib/libwebcore.so
09-01 09:49:49.985: INFO/DEBUG(30): #16 pc 001a4e1a /system/lib/libwebcore.so
09-01 09:49:50.015: INFO/DEBUG(30): #17 pc 001a80a2 /system/lib/libwebcore.so
09-01 09:49:50.015: INFO/DEBUG(30): #18 pc 001a8236 /syst开发者_开发问答em/lib/libwebcore.so
09-01 09:49:50.015: INFO/DEBUG(30): #19 pc 00065108 /system/lib/libwebcore.so
09-01 09:49:50.025: INFO/DEBUG(30): #20 pc 00065cae /system/lib/libwebcore.so
09-01 09:49:50.045: INFO/DEBUG(30): #21 pc 001254e2 /system/lib/libwebcore.so
09-01 09:49:50.045: INFO/DEBUG(30): #22 pc 001255da /system/lib/libwebcore.so
09-01 09:49:50.066: INFO/DEBUG(30): #23 pc 00125600 /system/lib/libwebcore.so
09-01 09:49:50.075: INFO/DEBUG(30): #24 pc 00017d74 /system/lib/libdvm.so
09-01 09:49:50.085: INFO/DEBUG(30): code around pc:
09-01 09:49:50.085: INFO/DEBUG(30): 80045a28 447a4479 ed0cf7d1 20004c09 ee34f7d1
09-01 09:49:50.095: INFO/DEBUG(30): 80045a38 447c4808 6bdb5823 d0002b00 49064798
09-01 09:49:50.095: INFO/DEBUG(30): 80045a48 700a2226 eea0f7d1 000436b7 00045275
09-01 09:49:50.095: INFO/DEBUG(30): 80045a58 0005eb82 fffffec4 deadd00d b510b40e
09-01 09:49:50.105: INFO/DEBUG(30): 80045a68 4c0a4b09 447bb083 aa05591b 6b5bca02
09-01 09:49:50.105: INFO/DEBUG(30): code around lr:
09-01 09:49:50.105: INFO/DEBUG(30): afd19354 b0834a0d 589c447b 26009001 686768a5
09-01 09:49:50.105: INFO/DEBUG(30): afd19364 220ce008 2b005eab 1c28d003 47889901
09-01 09:49:50.116: INFO/DEBUG(30): afd19374 35544306 d5f43f01 2c006824 b003d1ee
09-01 09:49:50.116: INFO/DEBUG(30): afd19384 bdf01c30 000281a8 ffffff88 1c0fb5f0
09-01 09:49:50.116: INFO/DEBUG(30): afd19394 43551c3d a904b087 1c16ac01 604d9004
09-01 09:49:50.116: INFO/DEBUG(30): stack:
09-01 09:49:50.116: INFO/DEBUG(30): 440912b0 00000015
09-01 09:49:50.116: INFO/DEBUG(30): 440912b4 afd18407 /system/lib/libc.so
09-01 09:49:50.125: INFO/DEBUG(30): 440912b8 afd4270c /system/lib/libc.so
09-01 09:49:50.125: INFO/DEBUG(30): 440912bc afd426b8 /system/lib/libc.so
09-01 09:49:50.125: INFO/DEBUG(30): 440912c0 00000000
09-01 09:49:50.125: INFO/DEBUG(30): 440912c4 afd19375 /system/lib/libc.so
09-01 09:49:50.125: INFO/DEBUG(30): 440912c8 0029e2c0 [heap]
09-01 09:49:50.125: INFO/DEBUG(30): 440912cc afd183d9 /system/lib/libc.so
09-01 09:49:50.135: INFO/DEBUG(30): 440912d0 0029ecf0 [heap]
09-01 09:49:50.135: INFO/DEBUG(30): 440912d4 0005eb82 [heap]
09-01 09:49:50.135: INFO/DEBUG(30): 440912d8 40542240 /dev/ashmem/dalvik-heap (deleted)
09-01 09:49:50.135: INFO/DEBUG(30): 440912dc 80085acc /system/lib/libdvm.so
09-01 09:49:50.135: INFO/DEBUG(30): 440912e0 0029ecf0 [heap]
09-01 09:49:50.135: INFO/DEBUG(30): 440912e4 afd18437 /system/lib/libc.so
09-01 09:49:50.145: INFO/DEBUG(30): 440912e8 df002777
09-01 09:49:50.145: INFO/DEBUG(30): 440912ec e3a070ad
09-01 09:49:50.145: INFO/DEBUG(30): #00 440912f0 00000001
09-01 09:49:50.145: INFO/DEBUG(30): 440912f4 8003774d /system/lib/libdvm.so
09-01 09:49:50.145: INFO/DEBUG(30): #01 440912f8 00000001
09-01 09:49:50.145: INFO/DEBUG(30): 440912fc 80039a15 /system/lib/libdvm.so
09-01 09:49:52.566: INFO/BootReceiver(60): Copying /data/tombstones/tombstone_00 to DropBox (SYSTEM_TOMBSTONE)
09-01 09:49:52.596: INFO/DEBUG(30): debuggerd committing suicide to free the zombie!
09-01 09:49:52.646: INFO/DEBUG(379): debuggerd: Feb 3 2011 14:45:34
09-01 09:49:52.685: DEBUG/dalvikvm(60): GC_FOR_MALLOC freed 1015K, 51% free 4407K/8967K, external 3520K/4385K, paused 104ms
09-01 09:49:52.776: DEBUG/dalvikvm(130): GC_EXPLICIT freed 19K, 52% free 2888K/5895K, external 5582K/6620K, paused 1008ms
09-01 09:49:52.786: DEBUG/Zygote(32): Process 366 terminated by signal (11)
09-01 09:49:52.796: INFO/ActivityManager(60): Process com.hello (pid 366) has died.
09-01 09:49:52.806: ERROR/InputDispatcher(60): channel '406b7e10 com.hello/com.hello.HelloWebView (server)' ~ Consumer closed input channel or an error occurred. events=0x8
09-01 09:49:52.806: ERROR/InputDispatcher(60): channel '406b7e10 com.hello/com.hello.HelloWebView (server)' ~ Channel is unrecoverably broken and will be disposed!
09-01 09:49:52.826: INFO/WindowManager(60): WIN DEATH: Window{406b7e10 com.hello/com.hello.HelloWebView paused=false}
UPDATE 1
I have successfully gotten the Toast on devices with 2.3.4 and higher. But still not on my emulator.
UPDATE 2
I have the same problem on an emulator with 2.3.4 on it. But no problem running it on an emulator with 2.2 on it.
http://code.google.com/p/android/issues/detail?id=12987
try this: http://quitenoteworthy.blogspot.com/2010/12/handling-android-23-webviews-broken.html this work for me....
加载中,请稍侯......
精彩评论