Android 如何解决JNI警告？_Android_Html_Java Native Interface_Nullpointerexception

Android 如何解决JNI警告？

android html

Android 如何解决JNI警告？,android,html,java-native-interface,nullpointerexception,Android,Html,Java Native Interface,Nullpointerexception,我在Android中有一个混合应用程序，它也包含本机功能：带javascript的HTML 5： <html> <head> <script src="jquery-1.5.1.min.js"></script> <script src="menus.js"></script> <script src="jquery-ui-1.8.10.custom.min.j

我在Android中有一个混合应用程序，它也包含本机功能：

带javascript的HTML 5：

<html>
    <head>
        <script src="jquery-1.5.1.min.js"></script>
        <script src="menus.js"></script>
        <script src="jquery-ui-1.8.10.custom.min.js"></script>
        <script type="text/javascript">
        function openCamera1(){
            camera.startCameraActivity1();
            var path1=camera.getImagePath1();
            alert(path1);
            document.getElementById("image1").src=path1;
        }
        function openCamera2(){
            camera.startCameraActivity2();
            var path2=camera.getImagePath2();
            alert(path2);
            document.getElementById("image2").src=path2;
        }
        function show_confirm()   {
            var r=confirm("Do you wish to use the existing Details?");
            if (r==true)
            {
                alert("You pressed OK!"); 
            }   else     {
                alert("You pressed Cancel!");
            }
        }

java语言：（android本机）：

数据助手类：

public String hello(){  
    return "Hello";  
}

我面临的例外是：

    12-19 09:19:57.894: WARN/dalvikvm(718): JNI WARNING: JNI method called with exception raised  
    12-19 09:19:57.894: WARN/dalvikvm(718): in Landroid/webkit/WebViewCore;.nativeTouchUp (IIIII)V (NewGlobalRef)  
    12-19 09:19:57.894: WARN/dalvikvm(718): Pending exception is:  
    12-19 09:19:57.894: INFO/dalvikvm(718): Ljava/lang/NullPointerException;:  
    12-19 09:19:57.894: INFO/dalvikvm(718): at com.test.hybrid.aviva.OpenCamera.getDetails(OpenCamera.java:179)  
    12-19 09:19:57.894: INFO/dalvikvm(718):     at android.webkit.WebViewCore.nativeTouchUp(Native Method)  
    12-19 09:19:57.894: INFO/dalvikvm(718):     at android.webkit.WebViewCore.access$3400(WebViewCore.java:48)  
    12-19 09:19:57.905: INFO/dalvikvm(718):     at android.webkit.WebViewCore$EventHub$1.handleMessage(WebViewCore.java:1094)  
    12-19 09:19:57.925: INFO/dalvikvm(718):     at android.os.Handler.dispatchMessage(Handler.java:99)  
    12-19 09:19:57.925: INFO/dalvikvm(718):     at android.os.Looper.loop(Looper.java:123)  
    12-19 09:19:57.925: INFO/dalvikvm(718):     at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:611)  
    12-19 09:19:57.925: INFO/dalvikvm(718):     at java.lang.Thread.run(Thread.java:1096)  
    12-19 09:19:57.925: INFO/dalvikvm(718): "WebViewCoreThread" prio=5 tid=15 NATIVE  
    12-19 09:19:57.934: INFO/dalvikvm(718):   | group="main" sCount=0 dsCount=0 s=N obj=0x44c13848 self=0x139858  
    12-19 09:19:57.934: INFO/dalvikvm(718):   | sysTid=725 nice=0 sched=0/0 cgrp=default handle=1284464  
    12-19 09:19:57.934: INFO/dalvikvm(718):   at android.webkit.WebViewCore.nativeTouchUp(Native Method)  
    12-19 09:19:57.934: INFO/dalvikvm(718):   at android.webkit.WebViewCore.nativeTouchUp(Native Method)
    12-19 09:19:57.934: INFO/dalvikvm(718):   at android.webkit.WebViewCore.access$3400(WebViewCore.java:48)  
    12-19 09:19:57.934: INFO/dalvikvm(718):   at android.webkit.WebViewCore$EventHub$1.handleMessage(WebViewCore.java:1094)
    12-19 09:19:57.934: INFO/dalvikvm(718):   at android.os.Handler.dispatchMessage(Handler.java:99)  
    12-19 09:19:57.934: INFO/dalvikvm(718):   at android.os.Looper.loop(Looper.java:123)  
    12-19 09:19:57.955: INFO/dalvikvm(718):   at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:611)   
    12-19 09:19:57.955: INFO/dalvikvm(718):   at java.lang.Thread.run(Thread.java:1096)  
    12-19 09:19:57.955: ERROR/dalvikvm(718): VM aborting

高度怀疑

String a=dh.hello();

dh为空。

高度可疑

String a=dh.hello();

dh为空

String a=dh.hello();