Java复习第一天---Javascript的基本知识点 - JAVA

packagecom.example.download;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	// 定义正在运行的线程
	private int threadRunning = 3;
	// 线程开启的数量
	private int threadNum = 3;

	private EditText et_url;
	// 进度条
	private ProgressBar progressBar;

	private TextView tv_pb;

	private int currentProgress = 0;

	private boolean flag = true;
	// 记录进度条的值
	public static int pb_count = 0;
	public static Handler handler;
	public static final int TEXTVALUE = 1;
	public static int pb_num = 0;
	public static int size = 0;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// 获取控件对象
		et_url = (EditText) findViewById(R.id.et_url);
		progressBar = (ProgressBar) findViewById(R.id.tv_jindu);
		tv_pb = (TextView) findViewById(R.id.tv_pb);
		File sdDir = Environment.getExternalStorageDirectory();
		File pdFile = new File(sdDir, pb.txt);
		InputStream is = null;
		try {
			if (pdFile.exists()) {
				is = new FileInputStream(pdFile);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		if (is != null) {
			String value = StreamTools.streamTostr(is);
			String arr[] = value.split(;);
			progressBar.setMax(Integer.valueOf(arr[0]));// 最大值
			currentProgress = Integer.valueOf(arr[1]);// 当前值
			progressBar.setProgress(currentProgress);
			;
			tv_pb.setText(当前的进度是 + arr[2] + %);
		}
	}

	public void downLoadFile(View v) {
		// 访问地址：
		final String spec = et_url.getText().toString();// http://172.16.237.144:8080/Login/football.jpg;
		if (TextUtils.isEmpty(spec)) {
			Toast.makeText(this, 




下载地址不能为空, Toast.LENGTH_LONG).show();
		} else {
			new Thread() {
				public void run() {
					try {
						URL url = new URL(spec);
						HttpURLConnection httpURLConnection = (HttpURLConnection) url
								.openConnection();
						// 设置请求的头文件信息还有时间
						httpURLConnection.setRequestMethod(GET);
						httpURLConnection.setConnectTimeout(5000);
						httpURLConnection.setReadTimeout(5000);
						if (httpURLConnection.getResponseCode() == 200) {
							int fileLength = httpURLConnection
									.getContentLength();
							// 设置进度条的最大值
							progressBar.setMax(fileLength);
							// 判断你的设备SDCard是否可用
							if (Environment.getExternalStorageState().equals(
									Environment.MEDIA_MOUNTED)) {
								// 外部存储设备的路径
								File sdfile = Environment
										.getExternalStorageDirectory();
								// 获取文件的名称
								String fileName = spec.substring(spec
										.lastIndexOf(/) + 1);
								// 创建保存的文件
								File file = new File(sdfile, fileName);
								// 创建随机可以访问的文件对象
								RandomAccessFile accessFile = new RandomAccessFile(
										file, rwd);
								// 设置文件大
Java复习第一天---Javascript的基本知识点(一)
