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POerror in starting activity,
primarykey
Id
18072385
data
AcceptedAnswerId
0
AnswerCount
1
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CommentCount
14
CommunityOwnedDate
CreationDate
2013-08-06T05:27:54.267
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2013-08-06T16:27:11.093
LastEditDate
2013-08-06T16:15:11.317
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19679
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PostTypeId
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Score
-3
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text
Body
<p>i have an activity that contains buttons that will guide me to next activity.</p> <p>the problem is the first activity that contains those buttons give me this error.</p> <p>can you explain what is that error? </p> <p>Thank you.</p> <pre><code>08-06 05:16:53.278: E/AndroidRuntime(771): FATAL EXCEPTION: main 08-06 05:16:53.278: E/AndroidRuntime(771): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lspu.handbook/com.lspu.handbook.apr}: java.lang.NullPointerException 08-06 05:16:53.278: E/AndroidRuntime(771): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.app.ActivityThread.access$600(ActivityThread.java:141) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.os.Handler.dispatchMessage(Handler.java:99) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.os.Looper.loop(Looper.java:137) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.app.ActivityThread.main(ActivityThread.java:5039) 08-06 05:16:53.278: E/AndroidRuntime(771): at java.lang.reflect.Method.invokeNative(Native Method) 08-06 05:16:53.278: E/AndroidRuntime(771): at java.lang.reflect.Method.invoke(Method.java:511) 08-06 05:16:53.278: E/AndroidRuntime(771): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 08-06 05:16:53.278: E/AndroidRuntime(771): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 08-06 05:16:53.278: E/AndroidRuntime(771): at dalvik.system.NativeStart.main(Native Method) 08-06 05:16:53.278: E/AndroidRuntime(771): Caused by: java.lang.NullPointerException 08-06 05:16:53.278: E/AndroidRuntime(771): at com.lspu.handbook.apr.onCreate(apr.java:35) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.app.Activity.performCreate(Activity.java:5104) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 08-06 05:16:53.278: E/AndroidRuntime(771): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 08-06 05:16:53.278: E/AndroidRuntime(771): ... 11 more </code></pre> <p>here's my code:</p> <pre><code>public class apr extends Activity implements OnClickListener{ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); this.setContentView(R.layout.apr); Button ar = (Button)findViewById(R.id.ar); ar.setOnClickListener(this); Button reg = (Button)findViewById(R.id.reg); reg.setOnClickListener(this); Button ta = (Button)findViewById(R.id.ta); ta.setOnClickListener(this); Button vr = (Button)findViewById(R.id.vr); vr.setOnClickListener(this); Button foreign = (Button)findViewById(R.id.foreign); foreign.setOnClickListener(this); Button non = (Button)findViewById(R.id.nonreg); non.setOnClickListener(this); Button cross = (Button)findViewById(R.id.cross); cross.setOnClickListener(this); Button scholar = (Button)findViewById(R.id.scholar); scholar.setOnClickListener(this); Button nxt = (Button)findViewById(R.id.lspu_nxt_btn); nxt.setOnClickListener(this); StartAnimations(); } private void StartAnimations() { Animation anim = AnimationUtils.loadAnimation(this, R.anim.alpha); anim.reset(); LinearLayout l=(LinearLayout) findViewById(R.id.lspulayout); l.clearAnimation(); l.startAnimation(anim); //back button Button backButton = (Button)findViewById(R.id.lspu_bak_btn); backButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent instructionsIntent = new Intent(apr.this,MainBookActivity.class); startActivity(instructionsIntent); finish(); } }); } @Override public void onDestroy(){ super.onDestroy(); System.gc(); finish(); } @Override public void onClick(View v) { Intent intent = null; switch( v.getId() ) { case R.id.ar: intent = new Intent(this, Hand_Book_ar.class); break; case R.id.reg: intent = new Intent(this, Hand_Book_reg.class); break; case R.id.ta: intent = new Intent(this, Hand_Book_ta.class); break; case R.id.vr: intent = new Intent(this, Hand_Book_vr.class); break; case R.id.foreign: intent = new Intent(this, Hand_Book_foreign.class); break; case R.id.nonreg: intent = new Intent(this, Hand_Book_nonreg.class); break; case R.id.cross: intent = new Intent(this, Hand_Book_cross.class); break; case R.id.scholar: intent = new Intent(this, Hand_Book_scholar.class); break; case R.id.lspu_nxt_btn: intent = new Intent(this, apr2.class); break; default: Toast toast = Toast.makeText(this, "Do I missed the button you clicked?", Toast.LENGTH_SHORT); toast.show(); break; } // Open images if (intent != null) { intent.setAction(intent.ACTION_VIEW); startActivity(intent); } } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { //Handle the back button if(keyCode == KeyEvent.KEYCODE_BACK) { //Ask the user if they want to quit new AlertDialog.Builder(this) .setIcon(android.R.drawable.ic_dialog_alert) .setTitle(R.string.quit) .setMessage(R.string.really_quit) .setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //Stop the activity apr.this.finish(); } }) .setNegativeButton(R.string.no, null) .show(); return true; } else { return super.onKeyDown(keyCode, event); } } } </code></pre> <p>here's the xml:</p> <pre><code><?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/menubg" android:orientation="vertical" > <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" > <LinearLayout android:id="@+id/lspulayout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <ImageView android:id="@+id/tirlw" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:src="@drawable/titleapr" /> <Button android:id="@+id/ar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/btnallctr" android:gravity="top|center" android:text="Admission Requirements" android:textSize="17dp" /> <Button android:id="@+id/reg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/btnallctr" android:gravity="top|center" android:text="Registration" android:textSize="17dp" /> <Button android:id="@+id/ta" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/btnallctr" android:gravity="top|center" android:text="Transfer Admision" android:textSize="17dp" /> <Button android:id="@+id/vr" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/btnallctr" android:gravity="top|center" android:text="Validation Requirements" android:textSize="17dp" /> <Button android:id="@+id/foreign" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/btnallctr" android:gravity="top|center" android:text="Foreign Student Admission" android:textSize="16sp" /> <Button android:id="@+id/nonreg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/btnallctr" android:gravity="top|center" android:text="Non-Regular Admission" android:textSize="17sp" /> <Button android:id="@+id/cross" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/btnallctr" android:gravity="top|center" android:text="Cross Registration" android:textSize="18sp" /> <Button android:id="@+id/scholar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/btnallctr" android:gravity="top|center" android:text="Scholarship" android:textSize="18sp" /> <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content" > <Button android:id="@+id/lspu_bak_btn" android:layout_width="40dp" android:layout_height="30dp" android:layout_gravity="bottom|left" android:layout_marginTop="10dp" android:background="@drawable/backbtncntrl_hd" /> <Button android:id="@+id/lspu_nxt_btn" android:layout_width="40dp" android:layout_height="30dp" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:layout_alignTop="@+id/lspu_bak_btn" android:background="@drawable/nxtbtncntrl_hd" /> </RelativeLayout> </LinearLayout> </RelativeLayout> </LinearLayout> </code></pre> <p>to those who helps, thanks!</p>
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error in starting activity,
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