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मैं अपना पहला एंड्रॉइड ऐप (एक गेम) बनाने की कोशिश कर रहा हूं लेकिन मुझे कुछ कठिनाइयों को शुरू करना है।एंड्रॉइड डेवलपमेंट: "थ्रेड अपरिचित अपवाद के साथ बाहर निकलना"
जब मैं अपने कोड को चलाने मैं इस त्रुटि लॉग मिलती है:
05-25 02:41:51.022: WARN/dalvikvm(634): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): FATAL EXCEPTION: main
05-25 02:41:51.040: ERROR/AndroidRuntime(634): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.stickfigs.nmg/com.stickfigs.nmg.NMG}: java.lang.NullPointerException
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.os.Looper.loop(Looper.java:123)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at java.lang.reflect.Method.invokeNative(Native Method)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at java.lang.reflect.Method.invoke(Method.java:521)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at dalvik.system.NativeStart.main(Native Method)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): Caused by: java.lang.NullPointerException
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at com.stickfigs.nmg.NMG.onCreate(NMG.java:32)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): ... 11 more
05-25 02:41:51.062: WARN/ActivityManager(59): Force finishing activity com.stickfigs.nmg/.NMG
मुझे लगता है कि समस्या यह "धागा न आया हुआ अपवाद के साथ बाहर निकलने" है हिस्सा है, मुझे पता नहीं है क्या अपवाद हो सकता है या यह क्या पैदा ।
NMGView.java:
यहाँ मेरी कोड है पैकेज com.stickfigs.NMG;
import android.content.Context;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
class NMGView extends SurfaceView implements SurfaceHolder.Callback {
class NMGThread extends Thread {
//State-tracking constants
public static final int STATE_LOSE = 1;
public static final int STATE_PAUSE = 2;
public static final int STATE_READY = 3;
public static final int STATE_RUNNING = 4;
public static final int STATE_WIN = 5;
/** The state of the game. One of READY, RUNNING, PAUSE, LOSE, or WIN */
private int mode;
/** Handle to the surface manager object we interact with */
private SurfaceHolder surfaceHolder;
public NMGThread(SurfaceHolder surfaceHolderc, Context contextc) {
// get handles to some important objects
surfaceHolder = surfaceHolderc;
context = contextc;
}
/**
* Restores game state from the indicated Bundle. Typically called when
* the Activity is being restored after having been previously
* destroyed.
*
* @param savedState Bundle containing the game state
*/
public synchronized void restoreState(Bundle savedState) {
synchronized (surfaceHolder) {
setState(STATE_PAUSE);
}
}
/**
* Sets the game mode. That is, whether we are running, paused, in the
* failure state, in the victory state, etc.
*
* @param mode one of the STATE_* constants
* @param message string to add to screen or null
*/
public void setState(int modec) {
synchronized (surfaceHolder) {
mode = modec;
}
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
/** Handle to the application context, used to e.g. fetch Drawables. */
private Context context;
/** The thread that actually draws the animation */
private NMGThread thread;
public NMGView(Context context, AttributeSet attrs) {
super(context, attrs);
// register our interest in hearing about changes to our surface
SurfaceHolder holder = getHolder();
holder.addCallback(this);
// create thread only; it's started in surfaceCreated()
thread = new NMGThread(holder, context);
setFocusable(true); // make sure we get key events
}
/**
* Fetches the animation thread corresponding to this LunarView.
*
* @return the animation thread
*/
public NMGThread getThread() {
return thread;
}
}
NMG.java:
package com.stickfigs.nmg;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import com.stickfigs.nmg.NMGView.NMGThread;
public class NMG extends Activity {
/** Called when the activity is first created. */
/** A handle to the thread that's actually running the animation. */
private NMGThread nMGThread;
/** A handle to the View in which the game is running. */
private NMGView nMGView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Turn off the window's title bar
// TODO Turn off the status bar
requestWindowFeature(Window.FEATURE_NO_TITLE);
// tell system to use the layout defined in our XML file
setContentView(R.layout.nmg_layout);
// get handles to the LunarView from XML, and its LunarThread
nMGView = (NMGView) findViewById(R.id.nmg);
nMGThread = nMGView.getThread();
if (savedInstanceState == null) {
// we were just launched: set up a new game
nMGThread.setState(NMGThread.STATE_READY);
Log.w(this.getClass().getName(), "SIS is null");
} else {
// we are being restored: resume a previous game
nMGThread.restoreState(savedInstanceState);
Log.w(this.getClass().getName(), "SIS is nonnull");
}
}
}
अद्यतन:
R.java: पैकेज com.stickfigs.nmg यहाँ मेरी R.java और nmg_layout.xml है ;
public final class R {
public static final class attr {
}
public static final class drawable {
public static final int icon=0x7f020000;
}
public static final class id {
public static final int nmg=0x7f050000;
}
public static final class layout {
public static final int nmg_layout=0x7f030000;
}
public static final class string {
public static final int app_name=0x7f040001;
public static final int hello=0x7f040000;
}
}
nmg_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.stickfigs.nmg.NMGView
android:id="@+id/nmg"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</FrameLayout>
अरे क्या आप मुझे बता सकते हैं कि आपने कैसे हल किया यह त्रुटि सटीक रूप से, क्योंकि मुझे एक ही तरह की त्रुटि मिल रही है, और जब मैं लॉगकैट में उल्लिखित रेखा पर टिप्पणी करता हूं, तो यह अलग-अलग पंक्ति को इंगित करता है।इसकी थोड़ी अजीब ??? –