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POHow to Clear content on the layout?
 

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  1. POHow to Clear content on the layout?
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    <p>I just create a app for writing the text on Screen using TouchEvent method. It works fine. See this is code</p> <pre><code>public TouchEventView(Context context, AttributeSet attrs) { super(context, attrs); paint.setAntiAlias(true); paint.setColor(Color.WHITE); paint.setStyle(Paint.Style.STROKE); paint.setStrokeJoin(Paint.Join.ROUND); paint.setStrokeWidth(5f); } @Override protected void onDraw(Canvas canvas) { canvas.drawPath(path, paint); } @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: path.moveTo(x, y); return true; case MotionEvent.ACTION_MOVE: path.lineTo(x, y); break; default: return false; } invalidate(); return true; </code></pre> <p><strong>After, that i've written code for clear the content in layout : -</strong> </p> <pre><code>LinearLayout li = (LinearLayout)findViewById(R.id.linear); li.clearAnimation(); </code></pre> <p><strong>My Logcat</strong></p> <pre><code>11-18 16:10:18.681: I/System.out(22859): This is a log message 11-18 16:10:18.681: E/Mein Tag(22859): Hello 11-18 16:10:20.581: W/KeyCharacterMap(22859): No keyboard for id 0 11-18 16:10:20.581: W/KeyCharacterMap(22859): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 11-18 16:10:21.721: D/AndroidRuntime(22859): Shutting down VM 11-18 16:10:21.721: W/dalvikvm(22859): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 11-18 16:10:21.731: E/AndroidRuntime(22859): FATAL EXCEPTION: main 11-18 16:10:21.731: E/AndroidRuntime(22859): java.lang.NullPointerException 11-18 16:10:21.731: E/AndroidRuntime(22859): at de.vogella.android.touch.WriteOnScreenActivity.clear(WriteOnScreenActivity.java:47) 11-18 16:10:21.731: E/AndroidRuntime(22859): at de.vogella.android.touch.WriteOnScreenActivity.onOptionsItemSelected(WriteOnScreenActivity.java:38) 11-18 16:10:21.731: E/AndroidRuntime(22859): at android.app.Activity.onMenuItemSelected(Activity.java:2195) 11-18 16:10:21.731: E/AndroidRuntime(22859): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:730) 11-18 16:10:21.731: E/AndroidRuntime(22859): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:143) 11-18 16:10:21.731: E/AndroidRuntime(22859): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855) 11-18 16:10:21.731: E/AndroidRuntime(22859): at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532) 11-18 16:10:21.731: E/AndroidRuntime(22859): at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122) 11-18 16:10:21.731: E/AndroidRuntime(22859): at android.view.View$PerformClick.run(View.java:8816) 11-18 16:10:21.731: E/AndroidRuntime(22859): at android.os.Handler.handleCallback(Handler.java:587) 11-18 16:10:21.731: E/AndroidRuntime(22859): at android.os.Handler.dispatchMessage(Handler.java:92) 11-18 16:10:21.731: E/AndroidRuntime(22859): at android.os.Looper.loop(Looper.java:123) 11-18 16:10:21.731: E/AndroidRuntime(22859): at android.app.ActivityThread.main(ActivityThread.java:4627) 11-18 16:10:21.731: E/AndroidRuntime(22859): at java.lang.reflect.Method.invokeNative(Native Method) 11-18 16:10:21.731: E/AndroidRuntime(22859): at java.lang.reflect.Method.invoke(Method.java:521) 11-18 16:10:21.731: E/AndroidRuntime(22859): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 11-18 16:10:21.731: E/AndroidRuntime(22859): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 11-18 16:10:21.731: E/AndroidRuntime(22859): at dalvik.system.NativeStart.main(Native Method) 11-18 16:22:15.801: I/System.out(23179): This is a log message 11-18 16:22:15.811: E/Mein Tag(23179): Hello </code></pre> <p>When i press the clear button, i got Nullpointer Exception for this app. What am doing wrong?</p> <p>Anyone Guide me.</p>
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    1. PTQuestion
    1. USPraveenkumar
    1. USPraveenkumar
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    1. This table or related slice is empty.
    1. PO
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    3. PO
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    1. This table or related slice is empty.
    1. COFirst step is to look in your logcat and locate the nullpointerexception and look at the line
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      1. POHow to Clear content on the layout?
      1. USJan Højriis Dragsbaek
    2. COli is null here So please Check this line LinearLayout li = (LinearLayout)findViewById(R.id.linear); proper
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      1. POHow to Clear content on the layout?
      1. USsam_k
 

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