Android开发：从Tomcat上下载MP3 带百分比进度条
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); } }