android更新程序

㈠ Android 軟體更新機制是什麼樣的

應用啟動時，向伺服器請求最新的版本號，與自身的版本號比較，若伺服器版本更新，則通知用戶升級。在AndroidManifest中可以通過android:versionCode定義版本號。具體如何定義及在程序中使用參考SDK中的Dev Guide。當然若是通過自有伺服器升級，也可以以另外的方式定義版本號。

若是通過開發者自己的伺服器升級，用戶確認後下載apk包安裝即可。

㈡ 如何重新安裝系統\如何更新安卓系統

1、先打開手機，在桌面找到設置，並點擊進入設置界面。

㈢ android 怎麼實現應用內更新

android 實現應用內更新的方法為：
1、新建一個Android工程命名為:UpdateDemo。
2、新建一個UpdateManager.java類，負責軟體更新功能模塊，代碼如下：
package com.tutor.update;

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

public class UpdateManager {

private Context mContext;

//提示語
private String updateMsg = "有最新的軟體包哦，親快下載吧~";

//返回的安裝包url
private String apkUrl = "http://softfile.3g.qq.com:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk";

private Dialog noticeDialog;

private Dialog downloadDialog;
/* 下載包安裝路徑 */
private static final String savePath = "/sdcard/updatedemo/";

private static final String saveFileName = savePath + "UpdateDemoRelease.apk";

/* 進度條與通知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;

private int progress;

private Thread downLoadThread;

private boolean interceptFlag = false;

private Handler mHandler = new Handler(){
public void handleMessage(Message msg) {
switch (msg.what) {
case DOWN_UPDATE:
mProgress.setProgress(progress);
break;
case DOWN_OVER:

installApk();
break;
default:
break;
}
};
};

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

//外部介面讓主Activity調用
public void checkUpdateInfo(){
showNoticeDialog();
}

private void showNoticeDialog(){
AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle("軟體版本更新");
builder.setMessage(updateMsg);
builder.setPositiveButton("下載", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
showDownloadDialog();
}
});
builder.setNegativeButton("以後再說", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
noticeDialog = builder.create();
noticeDialog.show();
}

private void showDownloadDialog(){
AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle("軟體版本更新");

final 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 OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
interceptFlag = true;
}
});
downloadDialog = builder.create();
downloadDialog.show();

downloadApk();
}

private Runnable mdownApkRunnable = new Runnable() {
@Override
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);
//更新進度
mHandler.sendEmptyMessage(DOWN_UPDATE);
if(numread <= 0){
//下載完成通知安裝
mHandler.sendEmptyMessage(DOWN_OVER);
break;
}
fos.write(buf,0,numread);
}while(!interceptFlag);//點擊取消就停止下載.

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

}
};

/**
* 下載apk
* @param url
*/

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

}
}
第三步：在MainActivity.java也就是主Activity調用,代碼如下:
package com.tutor.update;

import android.app.Activity;
import android.os.Bundle;

public class MainAcitivity extends Activity {

private UpdateManager mUpdateManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

//這里來檢測版本是否需要更新
mUpdateManager = new UpdateManager(this);
mUpdateManager.checkUpdateInfo();
}
}
3、添加程序所用的資源與許可權：
下載的時候用到了ProgressBar,所以事先寫了一個progress.xml布局文件，代碼如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">

<ProgressBar
android:id="@+id/progress"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
/>
</LinearLayout>
4、運行查看。

㈣ 安卓 應用程序 在哪裡更新

應用寶，，，豌豆莢