Skip to main content

Example for Activity Life Cycle/Introdution to Activities in Android

Activity Life Cycle/Activity life cycle example in android

  • An activity represents a single screen with a user interface
  • A users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a map
  • An activity is implemented as a subclass of Activity
  • An application usually consists of multiple activities that are loosely bound to each other


Example for Activity LifeCycle
LifeCycleActivity .java



 
public class LifeCycleActivity extends Activity {  


   /** Called when the activity is first created. */
    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Toast.makeText(this, "onCreate()", Toast.L E N  G TH_LO N   G ).show();
}
@Override
protected void onStart() {
//the activity is become visible.
super.onStart();
Toast.makeText(this, "onStart()", Toast.L E N  G TH_LO N   G ).show();
}
@Override
protected void on P ause() {
super.onPause();
Toast.makeText(this, "on P ause()", Toast.L E N  G TH_LO N   G ).show();
}
@Override
protected void onResume() {
// TODO  Auto-generated method stub
super .onResume();
Toast.makeText(this,” onResume() ” , Toast.LENGTH_LONG).show();
}
@Override
protected void onStop() {
//the activity is no longer visible.
super.onStop();
Toast.makeText(this, "onStop()", Toast.L E NGTH_LONG).show();
}
@Override
protected void onDestroy() {
//The activity about to be destroyed.
super.onDestroy();
Toast.makeText(this, "onDestroy()", Toast.L E NGTH_LONG).show();
}
}



 main.xml
<?xml version= “  1 . 0   "  encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="v  e r tical"
    android:layout_width="fi Ll     _parent"
    android:layout_height="fill_parent"
    >
<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
<Button
android:text="button"
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:onclick="select">
</Button>
</LinearLayout>

Labels:

Comments

Post a Comment

Popular posts from this blog

Capture image without surface view as background service in android

Capture image without user knowledge in android/Capture image as background service in android/Take photo without preview in android/ Camera without preview in android  package com.example.picture; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import android.app.Service; import android.content.Context; import android.content.Intent; import android.hardware.Camera; import android.hardware.Camera.Parameters; import android.media.AudioManager; import android.os.IBinder; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; public class CameraService extends Service {       //Camera variables       //a surface holder       private SurfaceHolder sHolder ;        //a variable to control the camera       private Camera mCamera ;   ...
10 comments
Read more

Progressbar example in android

Progress bar In android, progress bar can be used to tell the user the task takes longer time to finish. Progress  bar displays a bar which represent how far the operations has progressed. Progress bar can be made indeterminate. In indeterminate mode, progress bar shows a cyclic animation without indication progress. In this tutorial, I’ll show how to display a progress bar  package com.example; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.widget.ProgressBar; import android.widget.TextView; public class ProgressbarExamplActivity extends Activity {       private ProgressBar bar ;       private TextView txt ;       protected boolean isRunning ;       /** Called when the activity is first created. */       @Override       public void ...
1 comment
Read more

Coroutine- A complete tutorial

 What are coroutines? To know about coroutine, first you need to know about asynchronous programming, thread and multithreading concept. What is a thread? Thread describes in which context the function or sequence of instructions should be executed. So, every block of code or functions runs in a thread, right? Also, you can load multiple threads to perform different block of codes  How to start a thread? Thread thread = new Thread(){     public void run(){       System.out.println("This is a thread");     }   }     thread.start(); So when coming to android, before learning about coroutines we need to discuss some scenarios. Normally how an app works when user launch an application. When user launchers the application, a main thread is created. This thread is intended to do small operations like button clicks, UI interaction , small mathematical operations. We cant perform long running op...
Post a Comment
Read more