<LinearLayout xmlns:android="http://www.easck.com/apk/res/android"
xmlns:tools="http://www.easck.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/show"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/hello_world"/>
</LinearLayout>
网络资源多线程下载：
package com.example.threaddown;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
public class MainActivity extends Activity {
EditText url;
EditText target;
Button downBn;
ProgressBar bar;
DownUtil downUtil;
private int mDownStatus;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 获取程序界面中的三个界面控制
url = (EditText) findViewById(R.id.url);
target = (EditText) findViewById(R.id.target);
downBn = (Button) findViewById(R.id.downBn);
bar = (ProgressBar) findViewById(R.id.br);
// 创建一个Handler对象
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 0x123) {
bar.setProgress(mDownStatus);
}
}
};
downBn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 初始化DownUtil对象
downUtil = new DownUtil(url.getText().toString(), target
.getText().toString(), 6);
new Thread() {
@Override
public void run() {
try {
// 开始下载
downUtil.download();
} catch (Exception e) {
e.printStackTrace();
}
// 定义每秒调度获取一次系统的完成进度
final Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
// 获取下载任务的完成比例
double completeRate = downUtil
.getCompleteRate();
mDownStatus = (int) (completeRate * 1000);
// 发送消息通知届满更新的进度条
handler.sendEmptyMessage(0x123);
// 下载完成之后取消任务进度
if (mDownStatus >= 100) {
timer.cancel();
}
}
}, 0, 1000);
}
}.start();
}
});
}
@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;
}
}
