Main.java
package com.monmonja.firstDemo;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;
public class Main extends Activity {
private TextView txtStatus;
private RefreshHandler mRedrawHandler = new RefreshHandler();
class RefreshHandler extends Handler {
@Override
public void handleMessage(Message msg) {
Main.this.updateUI();
}
public void sleep(long delayMillis) {
this.removeMessages(0);
sendMessageDelayed(obtainMessage(0), delayMillis);
}
};
private void updateUI(){
int currentInt = Integer.parseInt((String) txtStatus.getText()) + 10;
if(currentInt <= 100){
mRedrawHandler.sleep(1000);
txtStatus.setText(String.valueOf(currentInt));
}
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
this.txtStatus = (TextView) this.findViewById(R.id.txtStatus);
updateUI();
}
}main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:id="@+id/txtStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:textSize="20px"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true">
</TextView>
</RelativeLayout>
Quick Explanation
This one is probably the most hardest for me to explain so far, okay so here is how it goes. We created a class inside our Activity that extends Handler, now on this handler we override handleMessage so what we can use this Handler to handle our messages to it. We then declare a sleep function to delay another execute of this handler with the function sendMessageDelayed. Now on our updateUI we set our own codes and call mRedrawHandler.sleep(1000); to delay our message. But before all of this to happen on our onCreate function we call updateUI to start updating our textfield.
