2019独角兽企业重金招聘Python工程师标准>>> 
public class MainActivtiy extends Activity{
private EditText et_path;
private LinearLayout ll_container;
private int threadCount=3;
private int runningThreadCount=3;
@override
protectd void onCreate(Bundle saveInstanceState)
{ //初始化控件
setContentView(R.layout.activity_main);
et_path=(EditText)findViewById(R.id.et_path);
ll_container=(LinearLayout) findViewById(R.id.ll_container);
pds=new ArrayList
} //单击下载按钮时，要调用的方法
public void download(View view)
{
final String path=et_path.getText( ).toString( ).trim( ); //获取路径
for(int i=0;i //加载自己写的子xml, 并放到容器中 ProgressBar pb=(ProgressBar) View.inflate(MainActivity.this , R.layout.pb , null); ll_container.addView(pd); pbs.add(pb); } //4.0以后不能在主线程中联网 new Thread() ｛ public void run() try { URL url=new URL(path); HttpURLConnection con=(HttpURLConnection)url.openConnection(); con.setRequestMethod("GET"); con.setConnectionTimeout(20000); int code=con.getResponseCode( ); if(code==200) //请求成功，先不下载，先利用randomAccessFile创建一个一样的文件 { int length=con.getContentLength( ); RandomAccessFile raf=new RandomAccessFile("/data/data/cn.my.download/a.exe","rwd"); raf.setLength(length); raf.close( ); //计算每个线程下载的大小 ，平均值 int blockSize=length/threadCount; for(int threadId=0; threadId int startIndex=threadId* blockSize; int endIndex=(threadId+1)*blocksize-1; if(threadId==threadCount-1) { //最后 一个线程 endIndex=length-1; } }else{ showToast("请求失败"); } }catch(Exception e) { e.printStackTrace ( ); showToast("请看日志"); } } }.start(); public void showToast(String result) { Toast.makeText(MainActivity.this , result , 0).show( ); } public class DownLoadThrea extends Thread { private int threadId; private int startIndex; private int endIndex; Private String path; public DownloadThread(int threadId, int startIndex, int endIndex,String path) { @override public void run(){ try{ URL url=new URL(path); HttpURLConnection con=(HttpURLConnection)url.openConnection( ); con.setRequestMethod("GET"); con.setConnectionTimeout(2000); conn.setRequestProperty("Range","bytes=" + startIndex + "-" + endIndex); int code=con.getResponseCode( ); if(code=206) RandomAccessFile raf = new RandomAccessFile("data/data/cn.my.myandroid_download/aa.exe","rwd"); e.printStaceTrace(); } } public void showToast(final String result) { ｝ } }
super();
this.threadId = threadId;
this.startIndex = startIndex;
this.endIndex = endIndex;
this.path = path;
}
raf.seek(startIndex);
InputStream is = conn.getInputStream();
int len = 0;
int max = endIndex - startIndex;
int currentSize = 0;
byte[] bys = new byte[1024];
while((len = is.read(bys)) != -1) {
raf.write(bys,0,len);
//每下载一个字节就更新进度条一次
//设置进度条的最大值
pbs.get(threadId).setMax(max);
//设置当前进度
currentSize += len;
pbs.get(threadId).setProgress(currentSize);
}
is.close();
raf.close();
synchronized(MainActivity.class) {
runningThreadCount--;
if(runningThreadCount <= 0) {
showToast("下载完成");
}
}
}else { showToast("请求失败,原因" + code); }
} catch (Exception e) {
e.printStackTrace();
showToast("请求失败,请查看日志猫");
}
}catch(Exception e){
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, result, 0).show();
}
});
}