Android(安卓)下载文件 显示进度条
16lz
2021-01-24
加入两个权限
一个是联网，另一个是读写SD卡
<uses-permission android:name="android.permission.INTERNET"></uses-permission> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
下载地址是本人的另外一台主机，现在当服务器了，路径可以测试
http://210.30.12.1:8080/mp3/DJ.mp3
import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.RandomAccessFile;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.Toast;public class FileDownProcessBarActivity extends Activity { /** Called when the activity is first created. */private static final String Path="http://210.30.12.1:8080/mp3/DJ.mp3";private ProgressBar progressBar;private TextView textView;private Button button;private int FileLength;private int DownedFileLength=0;private InputStream inputStream;private URLConnection connection;private OutputStream outputStream; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); progressBar=(ProgressBar) findViewById(R.id.progressBar1); textView=(TextView) findViewById(R.id.textView2); button=(Button) findViewById(R.id.button1); button.setOnClickListener(new ButtonListener()); } class ButtonListener implements OnClickListener{@Overridepublic void onClick(View v) {DownedFileLength=0;// TODO Auto-generated method stub Thread thread=new Thread(){ public void run(){ try {DownFile(Path);} catch (Exception e) {// TODO: handle exception} } }; thread.start();} } private Handler handler=new Handler() { public void handleMessage(Message msg) {if (!Thread.currentThread().isInterrupted()) {switch (msg.what) {case 0:progressBar.setMax(FileLength);Log.i("文件长度----------->", progressBar.getMax()+"");break;case 1:progressBar.setProgress(DownedFileLength);int x=DownedFileLength*100/FileLength;textView.setText(x+"%");break;case 2:Toast.makeText(getApplicationContext(), "下载完成", Toast.LENGTH_LONG).show();break;default:break;}}} };private void DownFile(String urlString) { /* * 连接到服务器 */ try { URL url=new URL(urlString); connection=url.openConnection(); if (connection.getReadTimeout()==5) {Log.i("---------->", "当前网络有问题");// return; } inputStream=connection.getInputStream();} catch (MalformedURLException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}/* * 文件的保存路径和和文件名其中Nobody.mp3是在手机SD卡上要保存的路径，如果不存在则新建 */String savePAth=Environment.getExternalStorageDirectory()+"/DownFile";File file1=new File(savePAth);if (!file1.exists()) { file1.mkdir();}String savePathString=Environment.getExternalStorageDirectory()+"/DownFile/"+"DJ.mp3";File file =new File(savePathString);if (!file.exists()) {try {file.createNewFile();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/* * 向SD卡中写入文件,用Handle传递线程 */Message message=new Message();try {outputStream=new FileOutputStream(file);byte [] buffer=new byte[1024*4];FileLength=connection.getContentLength();message.what=0;handler.sendMessage(message);while (DownedFileLength<FileLength) {outputStream.write(buffer); DownedFileLength+=inputStream.read(buffer); Log.i("-------->", DownedFileLength+""); Message message1=new Message(); message1.what=1; handler.sendMessage(message1);}Message message2=new Message();message2.what=2;handler.sendMessage(message2);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} } }
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