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.javapackage 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; }
}