apk自动下载断点续传，自动安装，卸载

直接上代码：

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;

import com.iblueyeClient.R;
import com.iblueyeClient.utils.Msg;

public class UpdateManager {

	private Context mContext;

	// 返回的安装包url
	private String apkUrl = "http://www.iblueye.com/client/download/ibePhone.apk";
	private Dialog noticeDialog;
	private Dialog downloadDialog;
	/* 下载包安装路径 */
	private static final String savePath = Environment
			.getExternalStorageDirectory().getPath();
	private static final String saveFileName = savePath + "/" + "ibePhone.apk";
	private Thread downLoadThread;
	private boolean interceptFlag = false;
	public ProgressBar mProgress;/* 进度条与通知ui刷新的handler和msg常量 */
	public int progress;
	private Handler handler;

	public UpdateManager(Context context, Handler h) {
		this.mContext = context;
		handler = h;
	}

	// 外部接口让主Activity调用
	public void confirmUpdate() {
		AlertDialog.Builder builder = new Builder(mContext);
		builder.setTitle(R.string.update_version);
		builder.setMessage(R.string.update_msg);
		builder.setPositiveButton(R.string.download, new OnClickListener() {
			public void onClick(DialogInterface dialog, int which) {
				dialog.dismiss();
				showDownloadDialog();
			}
		});
		builder.setNegativeButton(R.string.next_download,
				new OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						dialog.dismiss();
						handler.sendEmptyMessage(Msg.START);
					}
				});
		noticeDialog = builder.create();
		noticeDialog.show();
	}

	private void showDownloadDialog() {
		final LayoutInflater inflater = LayoutInflater.from(mContext);
		View v = inflater.inflate(R.layout.progress, null);
		mProgress = (ProgressBar) v.findViewById(R.id.progress);
		AlertDialog.Builder builder = new Builder(mContext);
		builder.setTitle(R.string.update_version);
		builder.setView(v);
		builder.setNegativeButton(R.string.cancel, new OnClickListener() {
			public void onClick(DialogInterface dialog, int which) {
				dialog.dismiss();
				interceptFlag = true;
				handler.sendEmptyMessage(Msg.START);
			}
		});
		downloadDialog = builder.create();
		downloadDialog.show();

		downloadApk();
	}

	private Runnable mdownApkRunnable = new Runnable() {
		public void run() {
			try {
				URL url = new URL(apkUrl);

				HttpURLConnection conn = (HttpURLConnection) url
						.openConnection();
				conn.connect();
				int length = conn.getContentLength();
				InputStream is = conn.getInputStream();

				File file = new File(savePath);
				if (!file.exists()) {
					file.mkdir();
				}
				String apkFile = saveFileName;
				File ApkFile = new File(apkFile);
				FileOutputStream fos = new FileOutputStream(ApkFile);

				int count = 0;
				byte buf[] = new byte[1024];

				do {
					int numread = is.read(buf);
					count += numread;
					progress = (int) (((float) count / length) * 100);
					/* 更新进度 */
					handler.sendEmptyMessage(Msg.DOWN_UPDATE);
					Log.i("更新测试", "progress=" + progress);
					if (numread <= 0) {
						/* 下载完成通知安装 */
						handler.sendEmptyMessage(Msg.DOWN_OVER);
						break;
					}
					fos.write(buf, 0, numread);
				} while (!interceptFlag);/* 点击取消就停止下载 */

				fos.close();
				is.close();
			} catch (MalformedURLException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}

		}
	};

	/**
	 * 下载apk
	 * 
	 * @param url
	 */

	private void downloadApk() {
		downLoadThread = new Thread(mdownApkRunnable);
		downLoadThread.start();
	}

	/**
	 * 安装apk
	 * 
	 * @param url
	 */
	public void installApk() {
		File apkfile = new File(saveFileName);
		if (!apkfile.exists()) {
			return;
		}
		Intent apk = new Intent(Intent.ACTION_VIEW);
		apk.setDataAndType(Uri.parse("file://" + apkfile.toString()),
				"application/vnd.android.package-archive");
		mContext.startActivity(apk);

	}

	public void uninstall(String pakageName) {
		Uri uri = Uri.parse(pakageName);
		Intent intent = new Intent(Intent.ACTION_DELETE, uri);
		mContext.startActivity(intent);
	}
}