I'm a newbie to android programming. I'm trying to create a 4 tab application on a machine running Windows Vista x64-Bit using the eclipse IDE. After doing some thorough researching, I came across this tutorial for creating a 4 tab application. I followed the instructions closely, modifying it where necessary to make my application.
When I attempted launching it in an Android Gingerbread 2.3.3 emulator, i kept getting a forced quit. What am I doing wrong? All suggestions are welcome. Thanks in advance.
Here is my MainActivity.java code (keep in mind that the extra imports are for future purposes)
package com.riverboys.riverbook_android;
import android.annotation.TargetApi;
import android.app.TabActivity;
import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle; // Makes an Android application an Android application
import android.os.StrictMode;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button; // For Button element
import android.widget.TabHost; // For Tab element
import android.widget.TabHost.TabSpec;
//import android.widget.EditText; // For EditText element (to take text input)
import android.widget.TextView; // For TextView element
import com.riverboys.riverbook_android.CustomHttpClient;
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends TabActivity {
// Called when the activity is first created
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* Show the Up button in the action bar.
setupActionBar();*/
Resources rsrcsRiverbook = getResources();
TabHost tbhstRiverbook = getTabHost();
// No need to call TabHost.Setup()
// First (Favorites) tab
Intent intntTab1 = new Intent().setClass(this, FavoritesActivity.class);
TabSpec tbspcTab1 = tbhstRiverbook
.newTabSpec("Favorites")
.setIndicator("Favorites", rsrcsRiverbook.getDrawable(R.drawable.icon_tab_favorites))
.setContent(intntTab1);
// Second (Search) tab
Intent intntTab2 = new Intent().setClass(this, SearchActivity.class);
TabSpec tbspcTab2 = tbhstRiverbook
.newTabSpec("Search")
.setIndicator("Search", rsrcsRiverbook.getDrawable(R.drawable.icon_tab_search))
.setContent(intntTab2);
// Third (Map) tab
Intent intntTab3 = new Intent().setClass(this, MapActivity.class);
TabSpec tbspcTab3 = tbhstRiverbook
.newTabSpec("Map")
.setIndicator("Map", rsrcsRiverbook.getDrawable(R.drawable.icon_tab_map))
.setContent(intntTab3);
// Fourth (River Log) tab
Intent intntTab4 = new Intent().setClass(this, RiverLogActivity.class);
TabSpec tbspcTab4 = tbhstRiverbook
.newTabSpec("River Log")
.setIndicator("River Log", rsrcsRiverbook.getDrawable(R.drawable.icon_tab_river_log))
.setContent(intntTab4);
//
tbhstRiverbook.addTab(tbspcTab1);
tbhstRiverbook.addTab(tbspcTab2);
tbhstRiverbook.addTab(tbspcTab3);
tbhstRiverbook.addTab(tbspcTab4);
// Set Favorites tab as default (zero based)
tbhstRiverbook.setCurrentTab(0);
}
}
and here is my activity_main.xml code
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="0dp">
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="0dp" />
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom" />
</LinearLayout>
</TabHost>
The code in the activity of the 4 tabs is identical to the following
package com.riverboys.riverbook_android;
import android.annotation.TargetApi;
import android.app.TabActivity;
import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle; // Makes an Android application an Android application
import android.os.StrictMode;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button; // For Button element
import android.widget.TabHost; // For Tab element
import android.widget.TabHost.TabSpec;
//import android.widget.EditText; // For EditText element (to take text input)
import android.widget.TextView; // For TextView element
import com.riverboys.riverbook_android.CustomHttpClient;
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class FavoritesActivity extends Activity {
// Called when the activity is first created
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_favorites);
}
}
and the code in their corresponding layout xml file is identical to the following
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".FavoritesActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
</RelativeLayout>
This is the error information I get in logcat when the app attempts to launch in the emulator
03-21 21:10:14.136: D/AndroidRuntime(338): Shutting down VM
03-21 21:10:14.136: W/dalvikvm(338): threadid=1: thread exiting with uncaught exception (group=0x40015560)
03-21 21:10:14.186: E/AndroidRuntime(338): FATAL EXCEPTION: main
03-21 21:10:14.186: E/AndroidRuntime(338): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.riverboys.riverbook_android/com.riverboys.riverbook_android.MainActivity}: android.content.res.Resources$NotFoundException: File res/drawable/icon_tab_favorites.xml from drawable resource ID #0x7f020005
03-21 21:10:14.186: E/AndroidRuntime(338): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.os.Handler.dispatchMessage(Handler.java:99)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.os.Looper.loop(Looper.java:123)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.app.ActivityThread.main(ActivityThread.java:3683)
03-21 21:10:14.186: E/AndroidRuntime(338): at java.lang.reflect.Method.invokeNative(Native Method)
03-21 21:10:14.186: E/AndroidRuntime(338): at java.lang.reflect.Method.invoke(Method.java:507)
03-21 21:10:14.186: E/AndroidRuntime(338): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-21 21:10:14.186: E/AndroidRuntime(338): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-21 21:10:14.186: E/AndroidRuntime(338): at dalvik.system.NativeStart.main(Native Method)
03-21 21:10:14.186: E/AndroidRuntime(338): Caused by: android.content.res.Resources$NotFoundException: File res/drawable/icon_tab_favorites.xml from drawable resource ID #0x7f020005
03-21 21:10:14.186: E/AndroidRuntime(338): at android.content.res.Resources.loadDrawable(Resources.java:1697)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.content.res.Resources.getDrawable(Resources.java:581)
03-21 21:10:14.186: E/AndroidRuntime(338): at com.riverboys.riverbook_android.MainActivity.onCreate(MainActivity.java:47)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
03-21 21:10:14.186: E/AndroidRuntime(338): ... 11 more
03-21 21:10:14.186: E/AndroidRuntime(338): Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #4: <item> tag requires a 'duration' attribute
03-21 21:10:14.186: E/AndroidRuntime(338): at android.graphics.drawable.AnimationDrawable.inflate(AnimationDrawable.java:256)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:787)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.graphics.drawable.Drawable.createFromXml(Drawable.java:728)
03-21 21:10:14.186: E/AndroidRuntime(338): at android.content.res.Resources.loadDrawable(Resources.java:1694)
03-21 21:10:14.186: E/AndroidRuntime(338): ... 15 more
03-21 21:10:18.925: I/Process(338): Sending signal. PID: 338 SIG: 9
03-21 21:10:22.785: D/AndroidRuntime(349): Shutting down VM
03-21 21:10:22.785: W/dalvikvm(349): threadid=1: thread exiting with uncaught exception (group=0x40015560)
03-21 21:10:22.815: E/AndroidRuntime(349): FATAL EXCEPTION: main
03-21 21:10:22.815: E/AndroidRuntime(349): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.riverboys.riverbook_android/com.riverboys.riverbook_android.MainActivity}: android.content.res.Resources$NotFoundException: File res/drawable/icon_tab_favorites.xml from drawable resource ID #0x7f020005
03-21 21:10:22.815: E/AndroidRuntime(349): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.os.Handler.dispatchMessage(Handler.java:99)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.os.Looper.loop(Looper.java:123)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.app.ActivityThread.main(ActivityThread.java:3683)
03-21 21:10:22.815: E/AndroidRuntime(349): at java.lang.reflect.Method.invokeNative(Native Method)
03-21 21:10:22.815: E/AndroidRuntime(349): at java.lang.reflect.Method.invoke(Method.java:507)
03-21 21:10:22.815: E/AndroidRuntime(349): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-21 21:10:22.815: E/AndroidRuntime(349): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-21 21:10:22.815: E/AndroidRuntime(349): at dalvik.system.NativeStart.main(Native Method)
03-21 21:10:22.815: E/AndroidRuntime(349): Caused by: android.content.res.Resources$NotFoundException: File res/drawable/icon_tab_favorites.xml from drawable resource ID #0x7f020005
03-21 21:10:22.815: E/AndroidRuntime(349): at android.content.res.Resources.loadDrawable(Resources.java:1697)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.content.res.Resources.getDrawable(Resources.java:581)
03-21 21:10:22.815: E/AndroidRuntime(349): at com.riverboys.riverbook_android.MainActivity.onCreate(MainActivity.java:47)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
03-21 21:10:22.815: E/AndroidRuntime(349): ... 11 more
03-21 21:10:22.815: E/AndroidRuntime(349): Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #4: <item> tag requires a 'duration' attribute
03-21 21:10:22.815: E/AndroidRuntime(349): at android.graphics.drawable.AnimationDrawable.inflate(AnimationDrawable.java:256)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:787)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.graphics.drawable.Drawable.createFromXml(Drawable.java:728)
03-21 21:10:22.815: E/AndroidRuntime(349): at android.content.res.Resources.loadDrawable(Resources.java:1694)
03-21 21:10:22.815: E/AndroidRuntime(349): ... 15 more
03-21 21:10:25.485: I/Process(349): Sending signal. PID: 349 SIG: 9
EDIT: Here's the code contained in the icon_tab_favorites, it's similar to the other three
<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- When selected, you should use bg with grey -->
<item android:drawable="@drawable/ic_tab_favorites"
android:state_selected="true" />
<!-- When not selected, you should use bg with white -->
<item android:drawable="@drawable/ic_tab_favorites" />
</animation-list>
EDIT: For future purposes, here's the correct form of the code :)
<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false" >
<!-- When selected, you should use bg with grey -->
<item android:drawable="@drawable/ic_tab_favorites"
android:state_selected="true"
android:duration="200" />
<!-- When not selected, you should use bg with white -->
<item android:drawable="@drawable/ic_tab_favorites"
android:duration="200" />
</animation-list>