Android版本更新示例

今天就来做一个版本更新的小例子，这个例子中也包含了xml数据的解析，使用listview展示，点击button提示版本更新，会完成下载

布局的话，使用正常的listview控件，增加一个button按钮

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >   <Button        android:layout_alignParentRight="true"       android:id="@+id/btn_update"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:text="检测新版本"       />   <ListView        android:id="@+id/main_lv"       android:layout_width="match_parent"       android:layout_height="match_parent"       android:layout_below="@+id/btn_update"       ></ListView></RelativeLayout>

item页面也是简单的写了三个TextView来展示

<?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" >    <TextView        android:id="@+id/title"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="标题" />    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <TextView            android:id="@+id/author"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="作者" />        <TextView            android:id="@+id/pubDate"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="更新日期" />    </LinearLayout></LinearLayout>

接下来 根据接收到的更新地址

http://www.oschina.net/MobileAppVersion.xml

得到更新需要的数据，创建Entity类 UpdateEntity

package com.bwie.test.bean;public class UpdateEntity {    //版本号    public String versionCode;    //下载地址    public String downloadUrl;    //更新描述    public String updateLog;    public String getVersionCode() {        return versionCode;    }    public void setVersionCode(String versionCode) {        this.versionCode = versionCode;    }    public String getDownloadUrl() {        return downloadUrl;    }    public void setDownloadUrl(String downloadUrl) {        this.downloadUrl = downloadUrl;    }    public String getUpdateLog() {        return updateLog;    }    public void setUpdateLog(String updateLog) {        this.updateLog = updateLog;    }}

创建简单的listview新闻界面展示的实体类 News

package com.bwie.test;public class News {    public String title;    public String author;    public String pubDate;}

适配器类MyAdapter 对数据进行适配

public class MyAdapter extends BaseAdapter {    Context context;    List<News> list;    public MyAdapter(Context context, List<News> list) {        super();        this.context = context;        this.list = list;    }    @Override    public int getCount() {        // TODO Auto-generated method stub        return list.size();    }    @Override    public Object getItem(int position) {        // TODO Auto-generated method stub        return null;    }    @Override    public long getItemId(int position) {        // TODO Auto-generated method stub        return 0;    }    @Override    public View getView(int position, View convertView, ViewGroup arg2) {        ViewHolder holder=null;        //优化ListView        if(convertView==null){            convertView=View.inflate(context, R.layout.item_list, null);            holder=new ViewHolder();            holder.title=(TextView) convertView.findViewById(R.id.title);            holder.author=(TextView) convertView.findViewById(R.id.author);            holder.pubDate=(TextView) convertView.findViewById(R.id.pubDate);            convertView.setTag(holder);        }else{            holder=(ViewHolder) convertView.getTag();        }        holder.title.setText(list.get(position).title);        holder.author.setText(list.get(position).author);        holder.pubDate.setText(list.get(position).pubDate);        return convertView;    }    // 优化类    class ViewHolder {        TextView title;        TextView author;        TextView pubDate;    }}

配置版本更新的工具类，在这里集成了版本更新的方法和apk安装方法
UpdateUtil

public class UpdateUtil {    // 用pull 解析器解析服务器返回的xml文件（xml封装了版本号）    public static UpdateEntity getUpdateInfo(InputStream is) throws Exception {        XmlPullParser parser = Xml.newPullParser();        parser.setInput(is, "utf-8");        int type = parser.getEventType();        UpdateEntity info = new UpdateEntity();        while (type != XmlPullParser.END_DOCUMENT) {            switch (type) {            case XmlPullParser.START_TAG:                if ("versionCode".equals(parser.getName())) {                    info.setVersionCode(parser.nextText());                } else if ("downloadUrl".equals(parser.getName())) {                    info.setDownloadUrl(parser.nextText());                } else if ("updateLog".equals(parser.getName())) {                    info.setUpdateLog(parser.nextText());                }                break;            }            type = parser.next();        }        return info;    }    // 安装apk    public void installApk(File file, Context context) {        Intent intent = new Intent();        // 执行动作        intent.setAction(Intent.ACTION_VIEW);        // 执行的数据类型        intent.setDataAndType(Uri.fromFile(file),                "application/vnd.android.package-archive");        context.startActivity(intent);    }}

接下来 写一下MainActivity的执行逻辑

public class MainActivity extends Activity {    private AlertDialog dialog;    private Button btnUpdate;    private ListView lv;    private String path1 = "http://www.oschina.net/action/api/news_list?catalog=1&pageIndex=0&pageSize=20";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 找控件        btnUpdate = (Button) findViewById(R.id.btn_update);        lv = (ListView) findViewById(R.id.main_lv);        // 解析数据        getData();        // 设置版本更新的监听        btnUpdate.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                dialog = new AlertDialog.Builder(MainActivity.this)                        .setTitle("软件版本更新").setPositiveButton("立即更新", onclick)                        .setNegativeButton("以后再说", null).create();                // 开启线程检查版本信息                new Thread(new CheckVersionTask()).start();            }        });    }    /**     * 版本更新的Hnadler     */    Handler handler = new Handler() {        public void handleMessage(android.os.Message msg) {            switch (msg.what) {            case 0:                dialog.setMessage(updateEntity.getUpdateLog());                dialog.show();                break;            case 1:                downLoadApk();                break;            }        };    };    /*     * 从服务器中下载APK     */    protected void downLoadApk() {        final ProgressDialog pd; // 进度条对话框        pd = new ProgressDialog(this);        pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);        pd.setMessage("正在下载更新");        pd.show();        new Thread() {            @Override            public void run() {                try {                    File file = getFileFromServer(                            updateEntity.getDownloadUrl(), pd);                    sleep(3000);                    UpdateUtil tools = new UpdateUtil();                    // 安装APk                    tools.installApk(file, MainActivity.this);                    pd.dismiss(); // 结束掉进度条对话框                } catch (Exception e) {                    e.printStackTrace();                }            }        }.start();    }    /**     * 下载方法     *      * @param path     * @param pd     * @return     * @throws Exception     */    public File getFileFromServer(String path, ProgressDialog pd)            throws Exception {        // 如果相等的话表示当前的sdcard挂载在手机上并且是可用的        if (Environment.getExternalStorageState().equals(                Environment.MEDIA_MOUNTED)) {            URL url = new URL(path);            HttpURLConnection conn = (HttpURLConnection) url.openConnection();            conn.setConnectTimeout(5000);            // 获取到文件的大小            pd.setMax(conn.getContentLength());            InputStream is = conn.getInputStream();            File file = new File(Environment.getExternalStorageDirectory(),                    "updata.apk");            FileOutputStream fos = new FileOutputStream(file);            BufferedInputStream bis = new BufferedInputStream(is);            byte[] buffer = new byte[1024];            int len;            int total = 0;            while ((len = bis.read(buffer)) != -1) {                fos.write(buffer, 0, len);                total += len;                // 获取当前下载量                pd.setProgress(total);            }            fos.close();            bis.close();            is.close();            return file;        } else {            return null;        }    }    /*     * 从服务器获取xml解析并进行比对版本号     */    private UpdateEntity updateEntity;    public class CheckVersionTask implements Runnable {        public void run() {            try {                // 从资源文件获取服务器 地址                String path = "http://www.oschina.net/MobileAppVersion.xml";                // 包装成url的对象                URL url = new URL(path);                HttpURLConnection conn = (HttpURLConnection) url                        .openConnection();                conn.setConnectTimeout(5000);                InputStream is = conn.getInputStream();                updateEntity = UpdateUtil.getUpdateInfo(is);                // 当前版本号                int versionCode = MainActivity.this.getPackageManager()                        .getPackageInfo(MainActivity.this.getPackageName(), 0).versionCode;                if (Integer.parseInt(updateEntity.getVersionCode()) <= versionCode) {                    Log.i("xxx", "版本号相同无需升级");                } else {                    Log.i("xxxx", "版本号不同 ,提示用户升级 ");                    handler.sendEmptyMessage(0);                }            } catch (Exception e) {                e.printStackTrace();            }        }    }    /**     * 立即更新的监听     */    DialogInterface.OnClickListener onclick = new DialogInterface.OnClickListener() {        @Override        public void onClick(DialogInterface dialog, int which) {            handler.sendEmptyMessage(1);        }    };    /**     * 请求数据的方法     */    private void getData() {        new Thread() {            public void run() {                try {                    // 使用HttpURLConnection解析数据                    URL url = new URL(path1);                    HttpURLConnection http = (HttpURLConnection) url                            .openConnection();                    http.setConnectTimeout(5000);                    http.setReadTimeout(5000);                    http.setRequestMethod("GET");                    int responseCode = http.getResponseCode();                    if (responseCode == 200) {                        InputStream inputStream = http.getInputStream();                        // 使用pull解析解析数据                        XmlPullParser pullParser = Xml.newPullParser();                        pullParser.setInput(inputStream, "UTF-8");                        int eventType = pullParser.getEventType();// 产生第一个事件                        while (eventType != XmlPullParser.END_DOCUMENT) {// 只要不是文档结束事件                            String name = pullParser.getName();// 获取解析器当前指向的元素的名称                            switch (eventType) {                            case XmlPullParser.START_DOCUMENT:                                list = new ArrayList<News>();                                break;                            case XmlPullParser.START_TAG:                                if ("news".equals(name)) {                                    news = new News();                                }                                if (news != null) {                                    if ("title".equals(name)) {                                        news.title = pullParser.nextText();// 获取解析器当前指向元素的下一个文本节点的值                                    } else if ("author".equals(name)) {                                        news.author = pullParser.nextText();                                    } else if ("pubDate".equals(name)) {                                        news.pubDate = pullParser.nextText();                                    }                                }                                break;                            case XmlPullParser.END_TAG:                                if ("news".equals(name)) {                                    list.add(news);                                    news = null;                                }                                break;                            }                            eventType = pullParser.next();                        }                        // 把解析的数据发送到Handler中处理                        mhandler.obtainMessage(1, list).sendToTarget();                    }                } catch (Exception e) {                    e.printStackTrace();                }            };        }.start();    }    // Handler    Handler mhandler = new Handler() {        public void handleMessage(android.os.Message msg) {            if (msg.what == 1) {                // 接收数据                @SuppressWarnings("unchecked")                List<News> newsList = (List<News>) msg.obj;                // 为ListView设置适配器                MyAdapter adapter = new MyAdapter(MainActivity.this, newsList);                lv.setAdapter(adapter);            }        };    };    List<News> list = null;    News news = null;    @Override    protected void onPause() {        super.onPause();    }    @Override    protected void onResume() {        super.onResume();    }}

以上 就是我对版本更新所做的一个简单的示例，希望通过这个示例能够对大家学习Android有所帮助