package com.src.fpkj.android;
import com.src.fpkj.android.down.DownFielToSdcard;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 实现一个带进度条的下载dialog显示百分比，很喜欢这效果，感觉很真切
*
* @author 1314HWL 2011/10/10/23:01
*/
public class MainActivity extends Activity implements OnClickListener {
Button btn_downMp3;
String httpUrl = "http://10.0.2.2:8080/webdav/missyou.mp3";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_downMp3 = (Button) findViewById(R.id.btn_down);
btn_downMp3.setOnClickListener(this);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_down:
DownFielToSdcard filedown = new DownFielToSdcard(MainActivity.this);
try {
// httpUrl:tomcat 下载地址 test/sdcard中得路径
filedown.LoadToSdcard(httpUrl, "test/", "missyou.mp3");
} catch (Exception e1) {
e1.printStackTrace();
}
break;
}
}
}
package com.src.fpkj.android.down;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import com.src.fpkj.android.R;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class DownFielToSdcard {
private static String SDPath;
ProgressBar pb;
TextView tv_percent;
int downLoadFileSize, tatalsize; // downLoadFileSize下载了多少， tatalsize总大小
Dialog dialog;
Context context;
public DownFielToSdcard(Context context) {
super();
this.context = context;
SDPath = Environment.getExternalStorageDirectory() + "/";// 得到的是/sdcard/
}
/**
* 在sdcard中创建文件
*
* @param fileName
* @return
* @throws Exception
*/
public File CreateFile(String fileName) throws Exception {
File file = new File(SDPath + fileName);
file.createNewFile();
return file;
}
/**
* 创建目录
*
* @param fileName
* @return
* @throws Exception
*/
public File CreateFileSdDir(String dirName) throws Exception {
File sdDir = new File(SDPath + dirName);
sdDir.mkdir();
return sdDir;
}
/**
* 判断文件是否存在
*
* @param fileName
* @return
*/
public boolean FileExist(String fileName) {
File file = new File(SDPath + fileName);
return file.exists();
}
/**
* 思路：要下载文件，先得创建目录
*/
public void LoadToSdcard(final String strUrl, final String path,
final String fileName) throws Exception {
if (FileExist("test/missyou.mp3")) {
Toast.makeText(context, R.string.filehaved, Toast.LENGTH_LONG)
.show();
} else {
View view = LayoutInflater.from(context).inflate(
R.layout.download_dialog_xml, null);
pb = (ProgressBar) view.findViewById(R.id.down_pb);
tv_percent = (TextView) view.findViewById(R.id.pro_int);
dialog = AlertDialogUtil(view, context,
context.getString(R.string.waittingloading));
new Thread(new Runnable() {
public void run() {
try {
URL url = new URL(strUrl);
HttpURLConnection conection = (HttpURLConnection) url
.openConnection();
tatalsize = conection.getContentLength();
InputStream input = conection.getInputStream();
File file = null;
OutputStream outputstream = null;
CreateFileSdDir(path);
file = CreateFile(path + fileName);
outputstream = new FileOutputStream(file);
byte data[] = new byte[1024 * 4];
sentMassage(0);
while (true) {
int temp = input.read(data);
if (temp == -1) {
break;
}
outputstream.write(data, 0, temp);
downLoadFileSize += temp;
sentMassage(1);
}
sentMassage(2);
outputstream.flush();
outputstream.close();
input.close();
} catch (Exception e) {
Toast.makeText(context, R.string.app_falls,
Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
}).start();
}
}
/**
* 返回一个dialog
*
* @param view
* @param context
* @param string
* @return
*/
private Dialog AlertDialogUtil(View view, Context context, String string) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle(string);
builder.setIcon(R.drawable.icon);
builder.setView(view);
builder.create();
return builder.show();
}
/**
* handler 处理动作
*/
Handler handler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 0:
pb.setMax(tatalsize);
break;
case 1:
pb.setProgress(downLoadFileSize);
int result = downLoadFileSize * 100 / tatalsize;
tv_percent.setText(context.getString(R.string.fileload)
+ result + "%");
break;
case 2:
dialog.dismiss();
Toast.makeText(context, R.string.loagsucces, Toast.LENGTH_LONG)
.show();
Log.v("test", "--->>> " + "end");
break;
}
}
};
/**
*
* @param flag
* 消息类型
*/
public void sentMassage(int flag) {
Message msg = new Message();
msg.what = flag;
handler.sendMessage(msg);
}
}
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, MainActivity!</string>
<string name="app_name">LoadDownFile</string>
<string name="loagsucces">下载成功</string>
<string name="app_falls">下载失败</string>
<string name="waittingloading">正在下载请稍后</string>
<string name="filehaved">文件已存在</string>
<string name="fileload">文件下载</string>
</resources>
