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：/article/8093785.html，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~~~~