[android-beginners] Re: Force Close when trying to use getApplication()
And, that worked like a charm. Not obvious.
I like this book. Definitely a good guide, but they DO leave some
important details out here and there.
On May 11, 8:33 am, Carmen Delessio wrote:
> I experienced something like this when following the example in the book.
> The Author's have code and a comment on this
> here:http://unlocking-android.googlecode.com/svn/chapter3/trunk/Restaurant...
>
> The key to this, I think, is the AndroidManifest.xml
> file:http://unlocking-android.googlecode.com/svn/chapter3/trunk/Restaurant...
>
> android:label="@string/app_short_name"
> android:name="RestaurantFinderApplication"
> android:allowClearUserData="true"
> android:theme="@android:style/Theme.Black">
> ...
>
> When using this method, you *must* specify the "android:name" for the
> application and it needs to be the name of the application class.
>
> In the specific case described, check AndroidManifest.xml and, if it is not
> there, add android:name="BoardGamerFinderApplication"
>
> More info on
> this:http://developer.android.com/intl/zh-CN/guide/appendix/faq/framework
>
> Carmen
> --
> Carmen
> Delessiohttp://www.twitter.com/CarmenDelessiohttp://www.talkingandroid.comhttp://www.facebook.com/BFFPhotohttp://www.twitter.com/DroidDrop
>
>
>
> On Tue, May 11, 2010 at 11:13 AM, Jon Jacob wrote:
> > getApplication(), I believe, comes from the Application class that
> > BoardGameFinderApplication is an extension of. I did put the
> > suspected section in a try - catch block and the error message
> > referenced the android.app.Application as the error not very
> > helpful since I pretty much know that is where the problem lies. I
> > just don't know the specific cause.
>
> > On May 11, 7:46 am, Justin Anderson wrote:
> > > Where is the getApplication() method defined? My initial thought would
> > be
> > > that it is returning null for some reason and you are not checking for
> > > that... perhaps with a try catch block or a simple null check... But I
> > can't
> > > tell for sure without seeing this method.
>
> > > What does logcat say about the cause?
>
> > > Thanks,
> > > Justin
>
> > > --
> > > There are only 10 types of people in the world...
> > > Those who know binary and those who don't.
> > > --
>
> > > On Tue, May 11, 2010 at 8:02 AM, Jon Jacob
> > wrote:
> > > > I am a newbie both to Java and Android and have been reading the book
> > > > "Unlocking Android" and trying to learn by adapting their code to my
> > > > ideas for a project to play with and learn Android.
>
> > > > But, I have run into a brick wall that I need help with. The
> > > > following code gives me a force close when I click the submit button,
> > > > and I don't know why. (Good debugging tips would be nice too.)
>
> > > > Its the line:
>
> > > > BoardGameFinderApplication application = (BoardGameFinderApplication)
> > > > getApplication();
>
> > > > that seems to be causing the crash. I just don't understand why? All
> > > > indications are that I am using it correctly. What am I missing?
>
> > > > Here is the code:
>
> > > > From my main activity class:
>
> > > > import java.util.ArrayList;
>
> > > > import android.app.Activity;
> > > > import android.content.Intent;
> > > > import android.os.Bundle;
> > > > import android.os.Debug;
> > > > import android.view.View;
> > > > import android.view.View.OnClickListener;
> > > > import android.widget.Button;
> > > > import android.widget.EditText;
> > > > import android.widget.TextView;
>
> > > > public class BoardgameCriteria1 extends Activity {
>
> > > > private Button grabGames;
> > > > private TextView introText;
> > > > private EditText gameName;
> > > > ArrayList bglNames = new ArrayList();
> > > > private String s;
>
> > > > �...@override
> > > > public void onCreate(Bundle icicle) {
> > > > super.onCreate(icicle);
>
> > > > setContentView(R.layout.main);
> > > > this.introText = (TextView) findViewById(R.id.IntroText)
[android-beginners] Re: Force Close when trying to use getApplication()
getApplication(), I believe, comes from the Application class that
BoardGameFinderApplication is an extension of. I did put the
suspected section in a try - catch block and the error message
referenced the android.app.Application as the error not very
helpful since I pretty much know that is where the problem lies. I
just don't know the specific cause.
On May 11, 7:46 am, Justin Anderson wrote:
> Where is the getApplication() method defined? My initial thought would be
> that it is returning null for some reason and you are not checking for
> that... perhaps with a try catch block or a simple null check... But I can't
> tell for sure without seeing this method.
>
> What does logcat say about the cause?
>
> Thanks,
> Justin
>
> --
> There are only 10 types of people in the world...
> Those who know binary and those who don't.
> ----------
>
>
>
> On Tue, May 11, 2010 at 8:02 AM, Jon Jacob wrote:
> > I am a newbie both to Java and Android and have been reading the book
> > "Unlocking Android" and trying to learn by adapting their code to my
> > ideas for a project to play with and learn Android.
>
> > But, I have run into a brick wall that I need help with. The
> > following code gives me a force close when I click the submit button,
> > and I don't know why. (Good debugging tips would be nice too.)
>
> > Its the line:
>
> > BoardGameFinderApplication application = (BoardGameFinderApplication)
> > getApplication();
>
> > that seems to be causing the crash. I just don't understand why? All
> > indications are that I am using it correctly. What am I missing?
>
> > Here is the code:
>
> > From my main activity class:
>
> > import java.util.ArrayList;
>
> > import android.app.Activity;
> > import android.content.Intent;
> > import android.os.Bundle;
> > import android.os.Debug;
> > import android.view.View;
> > import android.view.View.OnClickListener;
> > import android.widget.Button;
> > import android.widget.EditText;
> > import android.widget.TextView;
>
> > public class BoardgameCriteria1 extends Activity {
>
> > private Button grabGames;
> > private TextView introText;
> > private EditText gameName;
> > ArrayList bglNames = new ArrayList();
> > private String s;
>
> > �...@override
> > public void onCreate(Bundle icicle) {
> > super.onCreate(icicle);
>
> > setContentView(R.layout.main);
> > this.introText = (TextView) findViewById(R.id.IntroText);
> > this.gameName = (EditText) findViewById(R.id.GameName);
> > this.grabGames = (Button) findViewById(R.id.Submit);
>
> > // get the board game names when submit button hit
> > this.grabGames.setOnClickListener(
> > new OnClickListener() {
> > public void onClick(View v) {
> > handleGetReviews();
> > }
> > });
> > }
>
> > private void handleGetReviews() {
>
> > BoardGameFinderApplication application =
> > (BoardGameFinderApplication) getApplication();
>
> > application.setBoardGameCriteriaName(this.gameName.getText().toString());
> > Intent intent = new Intent(this.getApplicationContext(),
> > GameList1.class);
> > startActivity(intent);
> > }
> > }
>
> > and the BoardGameFinderApplication class:
>
> > public class BoardGameFinderApplication extends Application {
>
> > private BoardGame currentBoardGame;
> > private String gameCriteriaName;
>
> > public BoardGameFinderApplication() {
> > super();
> > }
>
> > �...@override
> > public void onCreate() {
> > super.onCreate();
> > }
>
> > �...@override
> > public void onTerminate() {
> > super.onTerminate();
> > }
>
> > public BoardGame getCurrentBoardGame() {
> > return this.currentBoardGame;
> > }
>
> > public String getBoardGameCriteriaName() {
> > return this.gameCriteriaName;
> > }
>
> > public void setCurrentBoardGame(BoardGame currentBoardGame) {
> > this.currentBoardGame = currentBoardGame;
> > }
>
> > public void setBoardGameCriteriaName(String boardGameCriteriaName)
> > {
&
[android-beginners] Force Close when trying to use getApplication()
I am a newbie both to Java and Android and have been reading the book
"Unlocking Android" and trying to learn by adapting their code to my
ideas for a project to play with and learn Android.
But, I have run into a brick wall that I need help with. The
following code gives me a force close when I click the submit button,
and I don't know why. (Good debugging tips would be nice too.)
Its the line:
BoardGameFinderApplication application = (BoardGameFinderApplication)
getApplication();
that seems to be causing the crash. I just don't understand why? All
indications are that I am using it correctly. What am I missing?
Here is the code:
>From my main activity class:
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Debug;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class BoardgameCriteria1 extends Activity {
private Button grabGames;
private TextView introText;
private EditText gameName;
ArrayList bglNames = new ArrayList();
private String s;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
this.introText = (TextView) findViewById(R.id.IntroText);
this.gameName = (EditText) findViewById(R.id.GameName);
this.grabGames = (Button) findViewById(R.id.Submit);
// get the board game names when submit button hit
this.grabGames.setOnClickListener(
new OnClickListener() {
public void onClick(View v) {
handleGetReviews();
}
});
}
private void handleGetReviews() {
BoardGameFinderApplication application =
(BoardGameFinderApplication) getApplication();
application.setBoardGameCriteriaName(this.gameName.getText().toString());
Intent intent = new Intent(this.getApplicationContext(),
GameList1.class);
startActivity(intent);
}
}
and the BoardGameFinderApplication class:
public class BoardGameFinderApplication extends Application {
private BoardGame currentBoardGame;
private String gameCriteriaName;
public BoardGameFinderApplication() {
super();
}
@Override
public void onCreate() {
super.onCreate();
}
@Override
public void onTerminate() {
super.onTerminate();
}
public BoardGame getCurrentBoardGame() {
return this.currentBoardGame;
}
public String getBoardGameCriteriaName() {
return this.gameCriteriaName;
}
public void setCurrentBoardGame(BoardGame currentBoardGame) {
this.currentBoardGame = currentBoardGame;
}
public void setBoardGameCriteriaName(String boardGameCriteriaName)
{
this.gameCriteriaName = boardGameCriteriaName;
}
}
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[android-beginners] Re: How to create a new folder on the SD card?
You hate finding the answer ;)
This is good to know, anyway. Thanks for posting the answer.
On May 6, 4:56 pm, DonFrench wrote:
> I hate it when I find the answer two minutes after posting the
> question! All I needed was this:
>
> android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
>
> in the manifest.
>
> On May 6, 4:50 pm, DonFrench wrote:
>
>
>
> > I am not succeeding in creating a new folder on the SD card using the
> > following code:
>
> > try{
> > String dirName = "/sdcard/testdir";
> > File newFile = new File(dirName);
> > newFile.mkdirs();
> > if(newFile.exists()){
> > toastLong("directory exists");
> > if(newFile.isDirectory()){
> > toastLong("isDirectory = true");
> > } else toastLong("isDirectory = false");
> > } else {
> > toastLong("directory doesn't exist");
> > }} catch(Exception e){
>
> > toastLong("Exception creating folder " + e);
>
> > }
>
> > I don't get an exception but the message I do get is "directory
> > doesn't exist"and in fact the folder is not created. Why doesn't this
> > work and what is the right way to do this?
>
> > --
> > You received this message because you are subscribed to the Google
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>
> > NEW! Try asking and tagging your question on Stack Overflow
> > athttp://stackoverflow.com/questions/tagged/android
>
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> > android-beginners+unsubscr...@googlegroups.com
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> > athttp://groups.google.com/group/android-beginners?hl=en
>
> --
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>
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