วันอาทิตย์ที่ 1 กรกฎาคม พ.ศ. 2555

Thread Example

--> Thread Example Code

Threads
Every application by default runs a single process upon creation that contains all the tasks.To avoid hanging the user interface, time-consuming tasks, such as network downloads orcomputationally intensive calculations, should reside in a separate background thread. It is up to the developer to implement this properly, but then the Android operating system (OS) prioritizes the threads accordingly.
Most applications can benefit from the use of threads.

ThreadExampleActivity.java

package Android.code.thread;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class ThreadExampleActivity extends Activity {
         
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
              
        Thread t = new Thread(new Runnable() {     
           
            public void run(){  
                                               
                        try{
                              Thread.sleep(5000);                                                    
                        }
                        catch(InterruptedException e){
                        }
                        // To do
                        startActivity(new Intent(
                                    "Android.code.thread.activity2"));                                          
            }
        });
        t.start();
       
        /*
        if(t != null){
          Thread dummy = t;

      t = null;
          dummy.interrupt();

    }
        */

    }
}

 main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#55D5F5"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        android:text="Thread Example"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="#FF0000"
        android:textSize="30dp" />

    <TextView
        android:id="@+id/tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:background="#AA66CC"
        android:text="Thread Running,
Wait for 5 sec."
        android:textColor="#000000"
        android:textSize="24dp" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="115dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"
        android:layout_weight="0.02"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="240dp"
        android:text="main.xml"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#0000FF"
        android:textSize="26dp" />

</LinearLayout>


Activity2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FF4444"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:background="#FFBB33"
        android:text="After 5 sec, Display this activity."
        android:textColor="#000000"
        android:textSize="30dp" />


    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="30dp"
       
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="200dp"
        android:text="activity2.xml"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>




 
-->more info Handler Example


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