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POandroid native code call java method success, but ui method failed
 

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  1. POandroid native code call java method success, but ui method failed
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    <p>I success go the flow of native call java method, but when the java method contains ui method, ui method always failed, and logcat will print VM aborting error:</p> <pre><code>E/ListenerTest( 1399): virtual void JNIListenerContext::postEv(int32_t) W/dalvikvm( 1399): JNI WARNING: JNI method called with exception pending W/dalvikvm( 1399): in Ldalvik/system/NativeStart;.run:()V (CallStaticVoidMethodV) W/dalvikvm( 1399): Pending exception is: I/dalvikvm( 1399): "Binder Thread #2" prio=5 tid=10 NATIVE I/dalvikvm( 1399): | group="main" sCount=0 dsCount=0 obj=0x413f0b98 self=0x89b7e8 I/dalvikvm( 1399): | sysTid=1411 nice=0 sched=0/0 cgrp=default handle=8998000 I/dalvikvm( 1399): | schedstat=( 0 0 0 ) utm=0 stm=0 core=0 I/dalvikvm( 1399): at dalvik.system.NativeStart.run(Native Method) I/dalvikvm( 1399): E/dalvikvm( 1399): VM aborting </code></pre> <p>In my native code:</p> <pre><code>JNIEnv *env = AndroidRuntime::getJNIEnv(); env-&gt;CallStaticVoidMethod( jclass, jmethod, arg);// call java method postEv(arg) </code></pre> <p>In my java code:</p> <pre><code>class ListenerClass { ... ... private static Listener mListener = null; public interface Listener { public void onMyListener( int arg ); } public void registerListener (Listener listener) { Log.d( TAG,"registerListener"); mListener = listener; } public static void postEv( int arg ) { Log.d( TAG,"postEv"); if( mListener != null ) { mListener.onMyListener( arg ); } else { Log.d( TAG,"no Listener"); } } } public class ListenerDemo extends Activity implements ListenerClass.Listener ... ... private TextView info; private ListenerClass lisener = null; public void onCreate(Bundle savedInstanceState) { info = (TextView) findViewById(R.id.info); info.setTextColor(Color.WHITE); info.setTextSize(20); info.setText("haha"); // this works lisener = new ListenerClass(); Log.d( TAG,"lisener.registerListener"); lisener.registerListener(this); } public void onMyListener( int arg ) { Log.d(TAG,"arg is: " + arg ); // this works info.setText("haha"); // this not works } ... ... } </code></pre> <p>I really don't know why this happaned. And I want the TextView to show, when an event has push to java's onMyListener.</p>
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    1. COIn your native code, how do you get the parameters you pass to java (jclass, jmethod, arg)
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    2. COjclass jclaz = env->FindClass(path); jmethodID jmed = env->GetStaticMethodID( jclaz, "postEv", "(I)V" ); int arg = 123; Anyway, these parameters have no problem, because the java method onMyListener has been called successed. Only the ui method ( info.setText("haha") ) failed. If there is no ui method, the java method will return success.
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      1. POandroid native code call java method success, but ui method failed
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    3. COFrom the log, there looks to be a pending Exception from JNI. Confirm that each of the parameters is not null, before calling the java method
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      1. USjogabonito
 

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