android软件自动更新的实现步骤

本篇文章是直接下载最新的APK安装的方法，并不是增量下载该APk。

转载请注明出处：http://blog.csdn.net/harryweasley/article/details/44955719，谢谢

想要实现一个android应用，自动更新下载APK软件的方法，我采取的是以下几步方法：

1.每次进入主界面时，获取服务器的数据，看是否是最新版本，是，则无操作，否，则进行以下步骤；

2.弹出是否更新软件的对话框，点击下载后

3.弹出下载的进度条的对话框，开始下载，可以上随时点击按钮，停止下载

4.下载完成后，调用系统安装软件的服务，安装软件

效果图：

实现过程：

新建一个UpdateManager方法，具体内容我已经有详细的注释

package lgx.acc.updatedemo;

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

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;

public class UpdateManager {
	// 应用程序Context
	private Context mContext;
	// 是否是最新的应用,默认为false
	private boolean isNew = false;
	private boolean intercept = false;
	// 下载安装包的网络路径
	private String apkUrl = "http://shouji.360tpcdn.com/360sj/tpi/20130201/"
			+ "com.flikie.wallpapers.gallery_4.apk";
	// 保存APK的文件夹
	private static final String savePath = "/sdcard/updatedemo/";
	private static final String saveFileName = savePath
			+ "UpdateDemoRelease.apk";
	// 下载线程
	private Thread downLoadThread;
	private int progress;// 当前进度
	TextView text;
	// 进度条与通知UI刷新的handler和msg常量
	private ProgressBar mProgress;
	private static final int DOWN_UPDATE = 1;
	private static final int DOWN_OVER = 2;

	public UpdateManager(Context context) {
		mContext = context;
	}

	/**
	 * 检查是否更新的内容
	 */
	public void checkUpdateInfo() {
		//这里的isNew本来是要从服务器获取的，我在这里先假设他需要更新
		if (isNew) {
			return;
		} else {
			showUpdateDialog();
		}
	}

	/**
	 * 显示更新程序对话框，供主程序调用
	 */
	private void showUpdateDialog() {
		AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
		builder.setTitle("软件版本更新");
		builder.setMessage("有最新的软件包，请下载!");
		builder.setPositiveButton("下载", new DialogInterface.OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				showDownloadDialog();
			}

		});
		builder.setNegativeButton("以后再说",
				new DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface dialog, int which) {
						dialog.dismiss();
					}
				});

		builder.create().show();
	}

	/**
	 * 显示下载进度的对话框
	 */
	private void showDownloadDialog() {
		AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
		builder.setTitle("软件版本更新");
		LayoutInflater inflater = LayoutInflater.from(mContext);
		View v = inflater.inflate(R.layout.progress, null);
		mProgress = (ProgressBar) v.findViewById(R.id.progress);

		builder.setView(v);
		builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				intercept = true;
			}
		});
		builder.show();
		downloadApk();
	}

	/**
	 * 从服务器下载APK安装包
	 */
	private void downloadApk() {
		downLoadThread = new Thread(mdownApkRunnable);
		downLoadThread.start();
	}

	private Runnable mdownApkRunnable = new Runnable() {

		@Override
		public void run() {
			URL url;
			try {
				url = new URL(apkUrl);
				HttpURLConnection conn = (HttpURLConnection) url
						.openConnection();
				conn.connect();
				int length = conn.getContentLength();
				InputStream ins = conn.getInputStream();
				File file = new File(savePath);
				if (!file.exists()) {
					file.mkdir();
				}
				File apkFile = new File(saveFileName);
				FileOutputStream fos = new FileOutputStream(apkFile);
				int count = 0;
				byte[] buf = new byte[1024];
				while (!intercept) {
					int numread = ins.read(buf);
					count += numread;
					progress = (int) (((float) count / length) * 100);

					// 下载进度
					mHandler.sendEmptyMessage(DOWN_UPDATE);
					if (numread <= 0) {
						// 下载完成通知安装
						mHandler.sendEmptyMessage(DOWN_OVER);
						break;
					}
					fos.write(buf, 0, numread);
				}
				fos.close();
				ins.close();

			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	};

	/**
	 * 安装APK内容
	 */
	private void installAPK() {
		File apkFile = new File(saveFileName);
		if (!apkFile.exists()) {
			return;
		}
		Intent intent = new Intent(Intent.ACTION_VIEW);
		intent.setDataAndType(Uri.parse("file://" + apkFile.toString()),
				"application/vnd.android.package-archive");
		mContext.startActivity(intent);
	};

	private Handler mHandler = new Handler() {
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {

			case DOWN_UPDATE:
				mProgress.setProgress(progress);
				break;

			case DOWN_OVER:
				installAPK();
				break;

			default:
				break;
			}
		}

	};
}

还有progressBar.xml的具体代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ProgressBar
        android:id="@+id/progress"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

之后在MainActivity的onCreate方法中，调用一下代码即可

UpdateManager manager=new UpdateManager(MainActivity.this);
		manager.checkUpdateInfo();

一定要记得在manifest里面加权限哈，

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

最后效果就出来了。

有什么建议请多多指教~~~~