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Thread: Running this code (It has no errors) on android emulator gives a message saying 'Unfortunately, the app has stopped'

  1. #1
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    Default Running this code (It has no errors) on android emulator gives a message saying 'Unfortunately, the app has stopped'

    Here's the code:

    package com.example.first666;
     
    import com.example.first666.util.SystemUiHider;
     
    import android.annotation.TargetApi;
    import android.app.Activity;
    import android.os.Build;
    import android.os.Bundle;
    import android.os.Handler;
    import android.view.MotionEvent;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;
     
    /**
     * An example full-screen activity that shows and hides the system UI (i.e.
     * status bar and navigation/system bar) with user interaction.
     * 
     * @see SystemUiHider
     */
    public class FullscreenActivity extends Activity {
    	int counter;
    	Button add, sub;
    	TextView display;
    	/**
    	 * Whether or not the system UI should be auto-hidden after
    	 * {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
    	 */
    	private static final boolean AUTO_HIDE = true;
     
    	/**
    	 * If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after
    	 * user interaction before hiding the system UI.
    	 */
    	private static final int AUTO_HIDE_DELAY_MILLIS = 3000;
     
    	/**
    	 * If set, will toggle the system UI visibility upon interaction. Otherwise,
    	 * will show the system UI visibility upon interaction.
    	 */
    	private static final boolean TOGGLE_ON_CLICK = true;
     
    	/**
    	 * The flags to pass to {@link SystemUiHider#getInstance}.
    	 */
    	private static final int HIDER_FLAGS = SystemUiHider.FLAG_HIDE_NAVIGATION;
     
    	/**
    	 * The instance of the {@link SystemUiHider} for this activity.
    	 */
    	private SystemUiHider mSystemUiHider;
     
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
     
    		setContentView(R.layout.activity_fullscreen);
    		counter = 0;
    		add = (Button) findViewById(R.id.bAdd);
    		sub = (Button) findViewById(R.id.bSub);
    		display = (TextView) findViewById(R.id.tvDispay);
    		add.setOnClickListener(new View.OnClickListener() {
    			@Override
    			public void onClick(View v) {
    				// TODO Auto-generated method stub
    				counter++;
    				display.setText("Your total is " + counter);
    			}
    		});
    		sub.setOnClickListener(new View.OnClickListener() {
    			@Override
    			public void onClick(View v) {
    				// TODO Auto-generated method stub
    				counter--;
    				display.setText("Your total is " + counter);
    			}
    		});
     
    		final View controlsView = findViewById(R.id.fullscreen_content_controls);
    		final View contentView = findViewById(R.id.fullscreen_content);
     
    		// Set up an instance of SystemUiHider to control the system UI for
    		// this activity.
    		mSystemUiHider = SystemUiHider.getInstance(this, contentView,
    				HIDER_FLAGS);
    		mSystemUiHider.setup();
    		mSystemUiHider
    				.setOnVisibilityChangeListener(new SystemUiHider.OnVisibilityChangeListener() {
    					// Cached values.
    					int mControlsHeight;
    					int mShortAnimTime;
     
    					@Override
    					@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    					public void onVisibilityChange(boolean visible) {
    						if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
    							// If the ViewPropertyAnimator API is available
    							// (Honeycomb MR2 and later), use it to animate the
    							// in-layout UI controls at the bottom of the
    							// screen.
    							if (mControlsHeight == 0) {
    								mControlsHeight = controlsView.getHeight();
    							}
    							if (mShortAnimTime == 0) {
    								mShortAnimTime = getResources().getInteger(
    										android.R.integer.config_shortAnimTime);
    							}
    							controlsView
    									.animate()
    									.translationY(visible ? 0 : mControlsHeight)
    									.setDuration(mShortAnimTime);
    						} else {
    							// If the ViewPropertyAnimator APIs aren't
    							// available, simply show or hide the in-layout UI
    							// controls.
    							controlsView.setVisibility(visible ? View.VISIBLE
    									: View.GONE);
    						}
     
    						if (visible && AUTO_HIDE) {
    							// Schedule a hide().
    							delayedHide(AUTO_HIDE_DELAY_MILLIS);
    						}
    					}
    				});
     
    		// Set up the user interaction to manually show or hide the system UI.
    		contentView.setOnClickListener(new View.OnClickListener() {
    			@Override
    			public void onClick(View view) {
    				if (TOGGLE_ON_CLICK) {
    					mSystemUiHider.toggle();
    				} else {
    					mSystemUiHider.show();
    				}
    			}
    		});
     
    		// Upon interacting with UI controls, delay any scheduled hide()
    		// operations to prevent the jarring behavior of controls going away
    		// while interacting with the UI.
    		findViewById(R.id.dummy_button).setOnTouchListener(
    				mDelayHideTouchListener);
    	}
     
    	@Override
    	public void onPostCreate(Bundle savedInstanceState) {
    		super.onPostCreate(savedInstanceState);
     
    		// Trigger the initial hide() shortly after the activity has been
    		// created, to briefly hint to the user that UI controls
    		// are available.
    		delayedHide(100);
    	}
     
    	/**
    	 * Touch listener to use for in-layout UI controls to delay hiding the
    	 * system UI. This is to prevent the jarring behavior of controls going away
    	 * while interacting with activity UI.
    	 */
    	View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
    		@Override
    		public boolean onTouch(View view, MotionEvent motionEvent) {
    			if (AUTO_HIDE) {
    				delayedHide(AUTO_HIDE_DELAY_MILLIS);
    			}
    			return false;
    		}
    	};
     
    	Handler mHideHandler = new Handler();
    	Runnable mHideRunnable = new Runnable() {
    		@Override
    		public void run() {
    			mSystemUiHider.hide();
    		}
    	};
     
    	/**
    	 * Schedules a call to hide() in [delay] milliseconds, canceling any
    	 * previously scheduled calls.
    	 */
    	public void delayedHide(int delayMillis) {
    		mHideHandler.removeCallbacks(mHideRunnable);
    		mHideHandler.postDelayed(mHideRunnable, delayMillis);
    	}
    }


  2. #2
    Super Moderator jps's Avatar
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    Default Re: Running this code (It has no errors) on android emulator gives a message saying 'Unfortunately, the app has stopped'

    What does the logcat say? That is where the real error message is

  3. #3
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    Default Re: Running this code (It has no errors) on android emulator gives a message saying 'Unfortunately, the app has stopped'

    06-05 14:52:46.269: E/Trace(466): error opening trace file: No such file or directory (2)
    06-05 14:52:48.300: D/AndroidRuntime(466): Shutting down VM
    06-05 14:52:48.309: W/dalvikvm(466): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
    06-05 14:52:48.360: E/AndroidRuntime(466): FATAL EXCEPTION: main
    06-05 14:52:48.360: E/AndroidRuntime(466): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.first666/com.example.first666.FullscreenActivity}: java.lang.NullPointerException
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.app.ActivityThread.access$600(ActivityThread.java:141)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.os.Handler.dispatchMessage(Handler.java:99)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.os.Looper.loop(Looper.java:137)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.app.ActivityThread.main(ActivityThread.java:5041)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at java.lang.reflect.Method.invokeNative(Native Method)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at java.lang.reflect.Method.invoke(Method.java:511)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at dalvik.system.NativeStart.main(Native Method)
    06-05 14:52:48.360: E/AndroidRuntime(466): Caused by: java.lang.NullPointerException
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at com.example.first666.FullscreenActivity.onCreate(FullscreenActivity.java:62)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.app.Activity.performCreate(Activity.java:5104)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
    06-05 14:52:48.360: E/AndroidRuntime(466): 	... 11 more
    06-05 14:53:28.219: I/Process(466): Sending signal. PID: 466 SIG: 9





    Here's the LogCat

  4. #4
    Super Moderator jps's Avatar
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    Default Re: Running this code (It has no errors) on android emulator gives a message saying 'Unfortunately, the app has stopped'

    java.lang.NullPointerException

    Which variable did not get initialized to a valid value before being used?

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