Hello all,
I'm trying to use a tabhost and populate tabs using intents and
activities. I've search all the examples I could find and I have
something that gives the right layout but crashes as soon as I open a
dialog. To reproduce it I made a small test program with 2 tabs, one
filled using an xml layout and one using an intend. When I try to open
the spinner in the second tab it crashes complaining about a null
pointer. I'm sure I did something stupid but I can't figure out
what ... please help.
Jouke
SOURCE:
--- Test.java
package com.jouke.test;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TabHost;
public class Test extends TabActivity {
private TabHost mTabHost;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab1);
mTabHost = getTabHost();
mTabHost.addTab(mTabHost.newTabSpec("Tab1")
.setIndicator("Tab1")
.setContent(R.id.tab1));
Intent tab2 = new Intent(this.getApplicationContext
(),tab2.class);
mTabHost.addTab(mTabHost.newTabSpec("Tab2")
.setIndicator("Tab2")
.setContent(tab2));
}
}
---- Tab1.java
package com.jouke.test;
import android.app.TabActivity;
import android.os.Bundle;
public class tab1 extends TabActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab1);
}
}
---- Tab2.java
package com.jouke.test;
import android.app.TabActivity;
import android.os.Bundle;
public class tab2 extends TabActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab2);
}
}
---- Test.manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android";
package="com.jouke.test"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/
app_name">
<activity android:name=".Test"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".tab1">
<intent-filter>
<action android:name="android.intent.action.EMBEDDED" /
>
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".tab2">
<intent-filter>
<action android:name="android.intent.action.EMBEDDED" /
>
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="3" />
</manifest>
--- tab1.xml
<?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">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/
android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/tab1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="hallo" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:entries="@array/spinnerItems"/>
</LinearLayout>
</FrameLayout>
</LinearLayout>
</TabHost>
--- tab2.xml
<?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">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/
android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/testlo">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="hallo" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:entries="@array/spinnerItems"/>
</LinearLayout>
</FrameLayout>
</LinearLayout>
</TabHost>
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