I have just started up with android and I am having trouble with
adding animation to the LinearLayout
I have added the log and java coding below, Please Help
Thank you
Rakshith S Kumar
package com.androidbook.triviaquiz;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.LayoutAnimationController;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
public class QuizMenuActivity extends QuizActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menu);
Log.i("Started","create list");
Animation fade1 = AnimationUtils.loadAnimation(this,
R.anim.fade_in);
LinearLayout layout = (LinearLayout)
findViewById(R.layout.menu);
LayoutAnimationController controller = new
LayoutAnimationController(fade1);
layout.setLayoutAnimation(controller);
ListView menulist =(ListView) findViewById(R.id.listView1);
String[] items = { getResources().getString(R.string.play),
getResources().getString(R.string.scores),
getResources().getString(R.string.settings),
getResources().getString(R.string.help) };
ArrayAdapter<String> adapt = new ArrayAdapter<String>(this,
R.layout.menu_item, items);
menulist.setAdapter(adapt);
menulist.setOnItemClickListener(new
AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View
itemClicked, int
position, long id){
TextView textview = (TextView) itemClicked;
String strtext = (String) textview.getText().toString();
if(strtext.equalsIgnoreCase(getResources().getString(R.string.play)))
{
startActivity(new Intent(QuizMenuActivity.this,
QuizGameActivity.class));
}
else
if(strtext.equalsIgnoreCase(getResources().getString(R.string.scores)))
{
startActivity(new Intent(QuizMenuActivity.this,
QuizScoresActivity.class));
}
else
if(strtext.equalsIgnoreCase(getResources().getString(R.string.settings)))
{
startActivity(new Intent(QuizMenuActivity.this,
QuizSettingsActivity.class));
}
else
if(strtext.equalsIgnoreCase(getResources().getString(R.string.help)))
{
startActivity(new Intent(QuizMenuActivity.this,
QuizHelpActivity.class));
}
}
});
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
LinearLayout layout = (LinearLayout) findViewById(R.layout.menu);
layout.clearAnimation();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Animation fade1 = AnimationUtils.loadAnimation(this,
R.anim.fade_in);
LinearLayout layout = (LinearLayout)
findViewById(R.layout.menu);
LayoutAnimationController controller = new
LayoutAnimationController(fade1);
layout.setLayoutAnimation(controller);
}
}
I get the following error on LogCat
06-10 15:30:38.019: ERROR/AndroidRuntime(270): Uncaught handler:
thread main exiting due to uncaught exception
06-10 15:30:38.068: ERROR/AndroidRuntime(270):
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.androidbook.triviaquiz/
com.androidbook.triviaquiz.QuizMenuActivity}:
java.lang.NullPointerException
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
2496)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
2512)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.app.ActivityThread.access$2200(ActivityThread.java:119)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.os.Handler.dispatchMessage(Handler.java:99)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.os.Looper.loop(Looper.java:123)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.app.ActivityThread.main(ActivityThread.java:4363)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
java.lang.reflect.Method.invokeNative(Native Method)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
java.lang.reflect.Method.invoke(Method.java:521)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
com.android.internal.os.ZygoteInit
$MethodAndArgsCaller.run(ZygoteInit.java:860)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
dalvik.system.NativeStart.main(Native Method)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): Caused by:
java.lang.NullPointerException
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
com.androidbook.triviaquiz.QuizMenuActivity.onCreate(QuizMenuActivity.java:
28)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
1047)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
2459)
06-10 15:30:38.068: ERROR/AndroidRuntime(270): ... 11 more
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