HandlerThread example

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Last post show examples of AsyncTask and Thread + Handler, here is another version using HandlerThread.

This video show how it run on Android Emulator running Android N, in Multi-Window. The left windows running example of HandlerThread in this post, the right window running Thread + Handler in last post.


MainActivity.java

package com.blogspot.android_er.androidhandlerthread;

import android.os.Handler;
import android.os.HandlerThread;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private Handler handler = new Handler();
    private MyHandlerThread myHandlerThread;

    Button btnStart;
    ProgressBar progressBar;
    TextView textMsg;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        progressBar = (ProgressBar)findViewById(R.id.progress);
        textMsg = (TextView)findViewById(R.id.msg);
        btnStart = (Button)findViewById(R.id.start);

        myHandlerThread = new MyHandlerThread("myHandlerThread");
        final Runnable myRunnable = new Runnable() {

            @Override
            public void run() {
                for (int i = 0; i <= 10; i++) {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                    //is accessed from within inner class, needs to be declared final
                    final int finalI = i;
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            progressBar.setProgress(finalI);
                        }
                    });
                }

                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        textMsg.setText("finished");
                    }
                });
            }
        };

        myHandlerThread.start();
        myHandlerThread.prepareHandler();

        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myHandlerThread.postTask(myRunnable);
            }
        });
    }

    @Override
    protected void onDestroy() {
        myHandlerThread.quit();
        super.onDestroy();
    }

    public class MyHandlerThread extends HandlerThread {

        private Handler handler;

        public MyHandlerThread(String name) {
            super(name);
        }

        public void postTask(Runnable task){
            handler.post(task);
        }

        public void prepareHandler(){
            handler = new Handler(getLooper());
        }
    }
}

layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    android:orientation="vertical"
    tools:context="com.blogspot.android_er.androidhandlerthread.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <Button
        android:id="@+id/start"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start"/>

    <ProgressBar
        android:id="@+id/progress"
        style="?android:attr/progressBarStyleHorizontal"
        android:indeterminate="false"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="10"
        android:progress="0"/>
    <TextView
        android:id="@+id/msg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

---

reference: Get a HandlerThread on your App

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