Apps Recovery the state of the first activity launched

[puxdroid]

Hello.

I have an application that launch a thread when a ToggleButton is pressed, but if I press the home button, a new activity is started (I can return to the first activity if I press the back button), but I want to recovery the first activity launched state, which have the reference of the initial thread.

This is my code:

org.test.test.java:

////////////////////////////////////////
package org.test;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.ToggleButton;

public class test extends Activity {

private Thread mRefresh;
private int mCounter = 0;

private ToggleButton mStartStopButton;
private TextView mTexStat;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

mStartStopButton = (ToggleButton) findViewById(R.id.startstop);
mTexStat = (TextView) findViewById(R.id.textStat);

mStartStopButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (mStartStopButton.isChecked()) {
mRefresh = new Thread(new Runnable() {
@Override
public void run() {

while (true) {

try {
Thread.sleep(1000);// 1 second
mCounter++;
} catch (InterruptedException e) {
Log.e("test", "Error sleeping", e);
}
}
}
});
//Start the thread
startThread();
} else {
// Stop thread an show the counter
stopThread();

}
}
});
}

private void stopThread() {
mRefresh.stop();
mTexStat.setText("Stopped, Counter = " + mCounter);
}

private void startThread() {
mRefresh.start();
mTexStat.setText("Started");

}
}

////////////////////////////////////////

this is the mail.xml:

////////////////////////////////////////<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
androidrientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout androidrientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="3dip">

<TextView android:layout_width="wrap_content"
android:id="@+id/textStatus"
android:layout_height="wrap_content"
android:text="Status:" />

<TextView android:text=""
android:id="@+id/textStat"
androidadding="3dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

<RelativeLayout androidrientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content">

<ToggleButton
android:id="@+id/startstop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
/>
</RelativeLayout>
</LinearLayout>
</LinearLayout>

////////////////////////////////////////



And this is my manifest.xml:

////////////////////////////////////////<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.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" android:clearTaskOnLaunch="false" android:allowTaskReparenting="false">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

</application>
<uses-sdk android:minSdkVersion="3" />

</manifest>

////////////////////////////////////////



Anybody knows how to solve this problem?

Sorry for my English.

 

[KeithG]

Try reading this
Application Fundamentals | Android Developers

You need to implement the onSaveInstanceState() and onRestoreInstanceState() methods

 

[puxdroid]

I have read this, but the system never execute onSaveInstanceState(), onli execute onResume() and onPause()

 

[KeithG]

Try implementing all 4.

 

[userands]

Scenario is as follows:
I have an application with Activity A calling Activity B.
When the user is in Acitivity B, and Home button is Clicked, the activity goes to the Background. The user then starts another heavy app like Map and operates that app for 10 minutes. The user then again comes to my Application and gets the Activity B screen - which works fine. However, when the user clicks the Button Back - Activity A shows a Black screen - No data is displayed.

This issue doesnt occur when the User switches between activities for a small amount of time.

Queries :
(1) In Android : The Previous Activites are picked from the Back Stack. So is it that when the Acitivty is in Background for a long amount of time, Android OS clears it from the Stack. - If so How to detect that an Activity is killed from the Stack.

(2) If an Activity is killed from Back Stack - How to recreate i.e How to create the List View again.

 

[userands]

Scenario is as follows:
I have an application with Activity A calling Activity B.
When the user is in Acitivity B, and Home button is Clicked, the activity goes to the Background. The user then starts another heavy app like Map and operates that app for 10 minutes. The user then again comes to my Application and gets the Activity B screen - which works fine. However, when the user clicks the Button Back - Activity A shows a Black screen - No data is displayed.

This issue doesnt occur when the User switches between activities for a small amount of time.

Queries :
(1) In Android : The Previous Activites are picked from the Back Stack. So is it that when the Acitivty is in Background for a long amount of time, Android OS clears it from the Stack. - If so How to detect that an Activity is killed from the Stack.

(2) If an Activity is killed from Back Stack - How to recreate i.e How to create the List View again.

This issue is occuring only on Motorola Fire - Android phone