You need to provide the -full- stack crawl including, very importantly, all of the "caused by" clauses which tell you the actual original errors that happened.
2009/10/12 黄登辉 <[email protected]> > Thanks for your warm reply. yeah, > i know which line code cause this exception. > the following is part of system log. > 10-13 09:42:10.782: ERROR/AndroidRuntime(705): Caused by: > java.lang.NullPointerException > 10-13 09:42:10.782: ERROR/AndroidRuntime(705): at > com.example.android.snake.Snake.onCreate(Snake.java:84) > > line 84 is :mSnakeView.setMode(SnakeView.READY); > > and the root reason is > > try { > > setContentView(R.layout.snake_layout); > > } catch (Exception e) { > > Log.d("SnakeView", "inside onCreate function -- > setContentView!"); > > > > } > > > > > > try { > > mSnakeView.setTextView((TextView) > findViewById(R.id.text)); > > } catch (Exception e) { > > Log.d("SnakeView", "inside onCreate function > last!"); > > > > } > > because in system log, there are two log as following: > > 10-13 09:42:10.763: DEBUG/SnakeView(705): inside onCreate function -- > setContentView! > 10-13 09:42:10.763: DEBUG/SnakeView(705): inside onCreate function last! > > > summary, i think there is a error in layout xml file, and cause android > can't explain this layout xml file. > > then occur the above exception. But the just reuse the snake's layout xml > from sdk sample. so i can't find any error in layout xml file. > > But i modify the implemented code of SnakeView and tileView . maybe the > implemented code have some problems. > > and attachment is source code, if you have some time, please have a look at > it. and i will continue to find this bug, which let me be in trouble two > days. > > > > > > 2009/10/13 Marco Nelissen <[email protected]> > > >> Look at the system log (either using "adb logcat" or with the ddms >> perspective in eclipse), and it will tell you exactly where and why it >> crashed. >> >> >> On Mon, Oct 12, 2009 at 7:37 AM, 登辉 黄 <[email protected]> wrote: >> > >> > we modifid snake from sdk samples. there is a running exception >> > "stopped unexpectedly". after step debug, i found that the statement >> > setContentView(R.layout.snake_layout); and mSnakeView.setTextView >> > ((TextView) findViewById(R.id.text));from snake.java file will throw >> > exceptions. i think the layout xml file have a some error. but i can't >> > find any error in this file. >> > >> > >> > <?xml version="1.0" encoding="utf-8"?> >> > <!-- Copyright (C) 2007 The Android Open Source Project >> > >> > Licensed under the Apache License, Version 2.0 (the "License"); >> > you may not use this file except in compliance with the License. >> > You may obtain a copy of the License at >> > >> > http://www.apache.org/licenses/LICENSE-2.0 >> > >> > Unless required by applicable law or agreed to in writing, >> > software >> > distributed under the License is distributed on an "AS IS" BASIS, >> > WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or >> > implied. >> > See the License for the specific language governing permissions >> > and >> > limitations under the License. >> > --> >> > >> > <FrameLayout xmlns:android="http://schemas.android.com/apk/res/ >> > android" >> > android:layout_width="fill_parent" >> > android:layout_height="fill_parent" >> > xmlns:app="http://schemas.android.com/apk/res/ >> > com.example.android.snake"> >> > >> > <com.example.android.snake.SnakeView >> > android:id="@+id/snake" >> > android:layout_width="fill_parent" >> > android:layout_height="fill_parent" >> > app:tileSize="40" >> > /> >> > >> > <RelativeLayout >> > android:layout_width="fill_parent" >> > android:layout_height="fill_parent" > >> > >> > <TextView >> > android:id="@+id/text" >> > android:text="@string/snake_layout_text_text" >> > android:visibility="visible" >> > android:layout_width="wrap_content" >> > android:layout_height="wrap_content" >> > android:layout_centerInParent="true" >> > android:gravity="center_horizontal" >> > android:textColor="#ff8888ff" >> > android:textSize="24sp"/> >> > </RelativeLayout> >> > </FrameLayout> >> > >> > >> > and snake.java as following: >> > >> > /* >> > * Copyright (C) 2007 The Android Open Source Project >> > * >> > * Licensed under the Apache License, Version 2.0 (the "License"); >> > * you may not use this file except in compliance with the License. >> > * You may obtain a copy of the License at >> > * >> > * http://www.apache.org/licenses/LICENSE-2.0 >> > * >> > * Unless required by applicable law or agreed to in writing, software >> > * distributed under the License is distributed on an "AS IS" BASIS, >> > * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or >> > implied. >> > * See the License for the specific language governing permissions and >> > * limitations under the License. >> > */ >> > >> > package com.example.android.snake; >> > >> > import android.app.Activity; >> > import android.os.Bundle; >> > import android.util.Log; >> > import android.view.Window; >> > import android.widget.TextView; >> > >> > /** >> > * Snake: a simple game that everyone can enjoy. >> > * >> > * This is an implementation of the classic Game "Snake", in which you >> > control a >> > * serpent roaming around the garden looking for apples. Be careful, >> > though, >> > * because when you catch one, not only will you become longer, but >> > you'll move >> > * faster. Running into yourself or the walls will end the game. >> > * >> > */ >> > public class Snake extends Activity { >> > >> > private SnakeView mSnakeView; >> > >> > private static String ICICLE_KEY = "snake-view"; >> > >> > /** >> > * Called when Activity is first created. Turns off the title bar, >> > sets up >> > * the content views, and fires up the SnakeView. >> > * >> > */ >> > @Override >> > public void onCreate(Bundle savedInstanceState) { >> > super.onCreate(savedInstanceState); >> > >> > >> > // No Title bar >> > try{ >> > requestWindowFeature(Window.FEATURE_NO_TITLE); >> > }catch(Exception e){ >> > Log.d("SnakeView", "inside onCreate function -- >> > requestWindowFeature!"); >> > >> > } >> > >> > try { >> > setContentView(R.layout.snake_layout); >> > } catch (Exception e) { >> > Log.d("SnakeView", "inside onCreate function -- >> setContentView!"); >> > >> > } >> > >> > try { >> > mSnakeView = (SnakeView) >> findViewById(R.id.snake); >> > } catch (Exception e) { >> > Log.d("SnakeView", "inside onCreate function -- >> findViewById >> > (R.id.snake)!"); >> > >> > } >> > >> > try { >> > mSnakeView.setTextView((TextView) >> findViewById(R.id.text)); >> > } catch (Exception e) { >> > Log.d("SnakeView", "inside onCreate function >> last!"); >> > >> > } >> > >> > >> > >> > >> > if (savedInstanceState == null) { >> > // We were just launched -- set up a new game >> > mSnakeView.setMode(SnakeView.READY); >> > } else { >> > // We are being restored >> > Bundle map = savedInstanceState.getBundle(ICICLE_KEY); >> > if (map == null) { >> > mSnakeView.setMode(SnakeView.PAUSE); >> > } >> > } >> > } >> > >> > @Override >> > protected void onPause() { >> > super.onPause(); >> > // Pause the game along with the activity >> > mSnakeView.setMode(SnakeView.PAUSE); >> > } >> > >> > >> > >> > } >> > >> > Please some peoples met this kind of problem or master in android >> > development, give me some suggestion? >> > >> > By the way, how can i attach some code? >> > >> > > >> > >> >> >> > > > > -- Dianne Hackborn Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
