Android 下载文件 显示进度条

加入两个权限

一个是联网，另一个是读写SD卡

1	<uses-permission android:name="android.permission.INTERNET"></uses-permission>

2	<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

001	import java.io.File;

002	import java.io.FileNotFoundException;

003	import java.io.FileOutputStream;

004	import java.io.IOException;

005	import java.io.InputStream;

006	import java.io.OutputStream;

007	import java.io.RandomAccessFile;

008	import java.net.MalformedURLException;

009	import java.net.URL;

010	import java.net.URLConnection;

011

012	import android.app.Activity;

013	import android.os.Bundle;

014	import android.os.Environment;

015	import android.os.Handler;

016	import android.os.Message;

017	import android.util.Log;

018	import android.view.View;

019	import android.view.View.OnClickListener;

020	import android.widget.Button;

021	import android.widget.ProgressBar;

022	import android.widget.TextView;

023	import android.widget.Toast;

024

025	public class FileDownProcessBarActivity extends Activity {

026	/** Called when the activity is first created. */

027	private static final String Path="http://210.30.12.1:8080/mp3/DJ.mp3";

028	private ProgressBar progressBar;

029	private TextView textView;

030	private Button button;

031	private int FileLength;

032	private int DownedFileLength=0;

033	private InputStream inputStream;

034	private URLConnection connection;

035	private OutputStream outputStream;

036

@Override

037	public void onCreate(Bundle savedInstanceState) {

038	super.onCreate(savedInstanceState);

039	setContentView(R.layout.main);

040	progressBar=(ProgressBar) findViewById(R.id.progressBar1);

041	textView=(TextView) findViewById(R.id.textView2);

042	button=(Button) findViewById(R.id.button1);

043	button.setOnClickListener(new ButtonListener());

044

}

045	class ButtonListener implements OnClickListener{

046

047

@Override

048	public void onClick(View v) {

049	DownedFileLength=0;

050	// TODO Auto-generated method stub

051	Thread thread=new Thread(){

052	public void run(){

053

try {

054	DownFile(Path);

055	} catch (Exception e) {

056	// TODO: handle exception

057

}

058

}

059

};

060	thread.start();

061

}

062

}

063	private Handler handler=new Handler()

064

{

065	public void handleMessage(Message msg)

066

{

067	if (!Thread.currentThread().isInterrupted()) {

068	switch (msg.what) {

069

case 0:

070	progressBar.setMax(FileLength);

071	Log.i("文件长度----------->", progressBar.getMax()+"");

072

break;

073

case 1:

074	progressBar.setProgress(DownedFileLength);

075	int x=DownedFileLength*100/FileLength;

076	textView.setText(x+"%");

077

break;

078

case 2:

079	Toast.makeText(getApplicationContext(), "下载完成", Toast.LENGTH_LONG).show();

080

break;

081

082

default:

083

break;

084

}

085

}

086

}

087

088

};

089

090	private void DownFile(String urlString)

091

{

092

093

/*

094

* 连接到服务器

095

*/

096

097

try {

098	URL url=new URL(urlString);

099	connection=url.openConnection();

100	if (connection.getReadTimeout()==5) {

101	Log.i("---------->", "当前网络有问题");

102	// return;

103

}

104	inputStream=connection.getInputStream();

105

106	} catch (MalformedURLException e1) {

107	// TODO Auto-generated catch block

108	e1.printStackTrace();

109	} catch (IOException e) {

110	// TODO Auto-generated catch block

111	e.printStackTrace();

112

}

113

114

/*

115	* 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

116

*/

117	String savePAth=Environment.getExternalStorageDirectory()+"/DownFile";

118	File file1=new File(savePAth);

119	if (!file1.exists()) {

120	file1.mkdir();

121

}

122	String savePathString=Environment.getExternalStorageDirectory()+"/DownFile/"+"DJ.mp3";

123	File file =new File(savePathString);

124	if (!file.exists()) {

125

try {

126	file.createNewFile();

127	} catch (IOException e) {

128	// TODO Auto-generated catch block

129	e.printStackTrace();

130

}

131

}

132

/*

133	* 向SD卡中写入文件,用Handle传递线程

134

*/

135	Message message=new Message();

136

try {

137	outputStream=new FileOutputStream(file);

138	byte [] buffer=new byte[1024*4];

139	FileLength=connection.getContentLength();

140	message.what=0;

141	handler.sendMessage(message);

142	while (DownedFileLength<FileLength) {

143	outputStream.write(buffer);

144	DownedFileLength+=inputStream.read(buffer);

145	Log.i("-------->", DownedFileLength+"");

146	Message message1=new Message();

147	message1.what=1;

148	handler.sendMessage(message1);

149

}

150	Message message2=new Message();

151	message2.what=2;

152	handler.sendMessage(message2);

153	} catch (FileNotFoundException e) {

154	// TODO Auto-generated catch block

155	e.printStackTrace();

156	} catch (IOException e) {

157	// TODO Auto-generated catch block

158	e.printStackTrace();

159

}

160

}

161

162

}