Android 开发中的线程

大多数的View都在是主线程中被创建出来的，所以修改View的相关属性一般都在主线程中进行。主线程一般用于接受用户的输入，以及将运算的结果反馈给用户。所以说对于一些可能会产生阻塞的操作，必须放置在Worker Thread.

//activity_main

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

   <ProgressBar 

       android:id="@+id/progressBarId"

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       style="?android:attr/progressBarStyleHorizontal"

       />

    <Button 

         android:id="@+id/buttonId"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@id/progressBarId"

        android:text="button" 

        />

</RelativeLayout>

//MainActivity.java

package com.example.thread;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ProgressBar;

import android.widget.TextView;

public class MainActivity extends Activity {

private Button button;

private ProgressBar progressBar;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

progressBar= (ProgressBar)findViewById(R.id.progressBarId);

button = (Button)findViewById(R.id.buttonId);

button.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

Log.i("Myhhread",Thread.currentThread().getName());

Thread thread = new Mythread();

thread.start();

}

});

}

class Mythread extends Thread{

@Override

public void run() {

for (int i = 0; i <=100; i++) {

try {

Thread.sleep(100);

} catch (InterruptedException e) {

e.printStackTrace();

}

progressBar.setProgress(progressBar.getProgress()+1);Log.i("Myhhread",Thread.currentThread().getName());

}

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}