Android提示版本更新操作流程

Android提示版本更新操作流程

2014年5月8日：

andorid的app應用中都會有版本更新的操作,今天空閒的時候就花了點心思弄了一下，主要技術方面用到了AsyncTask異步加載、http協議、json解析、獲取版本號等。。。

下面就來介紹一下大概的流程吧，首先呢：

activity_main.xml：

這裡我就只用了一個按鈕了！

接下來mainactivity代碼：

啟動了異步加載來處理的，如果舊版本小於新版本號，就開始執行下載操作，否則就不更新！

一步步看吧！

public class MainActivity extends Activity {

	Button m_btnCheckNewestVersion;
	long m_newVerCode; //最新版的版本號
	String m_newVerName; //最新版的版本名
	String m_appNameStr; //下載到本地要給這個APP命的名字
	
	Handler m_mainHandler;
	ProgressDialog m_progressDlg;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		//初始化相關變量
		initVariable();
		
		m_btnCheckNewestVersion.setOnClickListener(btnClickListener);
	}
	private void initVariable()
	{
		m_btnCheckNewestVersion = (Button)findViewById(R.id.chek_newest_version);
		m_mainHandler = new Handler();
		m_progressDlg =  new ProgressDialog(this);
		m_progressDlg.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
		 // 設置ProgressDialog 的進度條是否不明確 false 就是不設置為不明確     
		m_progressDlg.setIndeterminate(false);    
		m_appNameStr = "haha.apk";
	}
	
	OnClickListener btnClickListener = new View.OnClickListener() {
		
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			new checkNewestVersionAsyncTask().execute();
		}
	};
	
	class checkNewestVersionAsyncTask extends AsyncTask
	{
	
		@Override
		protected Boolean doInBackground(Void... params) {
			// TODO Auto-generated method stub
			if(postCheckNewestVersionCommand2Server())
			{
				int vercode = Common.getVerCode(getApplicationContext()); // 用到前面第一節寫的方法  
		         if (m_newVerCode > vercode) {  
		             return true;
		         } else {  
		             return false;
		         }  
			}
			return false;
		}
		
		@Override
		protected void onPostExecute(Boolean result) {
			// TODO Auto-generated method stub
			if (result) {//如果有最新版本
				doNewVersionUpdate(); // 更新新版本  
			}else {
				notNewVersionDlgShow(); // 提示當前為最新版本  
			}
			super.onPostExecute(result);
		}
		
		@Override
		protected void onPreExecute() {
			// TODO Auto-generated method stub
			super.onPreExecute();
		}
	}
	
	/**
	 * 從服務器獲取當前最新版本號，如果成功返回TURE，如果失敗，返回FALSE
	 * @return
	 */
	private Boolean postCheckNewestVersionCommand2Server()
	{
		StringBuilder builder = new StringBuilder();
		JSONArray jsonArray = null;
		try {
			// 構造POST方法的{name:value} 參數對
			List vps = new ArrayList();
			// 將參數傳入post方法中
			vps.add(new BasicNameValuePair("action", "checkNewestVersion"));
			builder = Common.post_to_server(vps);
			Log.e("msg", builder.toString());
			jsonArray = new JSONArray(builder.toString());
			if (jsonArray.length()>0) {
				if (jsonArray.getJSONObject(0).getInt("id") == 1) {
					m_newVerName = jsonArray.getJSONObject(0).getString("verName");
					m_newVerCode = jsonArray.getJSONObject(0).getLong("verCode");
					
					return true;
				}
			}
	
			return false;
		} catch (Exception e) {
			Log.e("msg",e.getMessage());
			m_newVerName="";
			m_newVerCode=-1;
			return false;
		}
	}
		
	/**
	 * 提示更新新版本
	 */
	private void doNewVersionUpdate() {
		int verCode = Common.getVerCode(getApplicationContext());  
	    String verName = Common.getVerName(getApplicationContext());  
	    
	    String str= "當前版本："+verName+" Code:"+verCode+" ,發現新版本："+m_newVerName+
	    		" Code:"+m_newVerCode+" ,是否更新？";  
	    Dialog dialog = new AlertDialog.Builder(this).setTitle("軟件更新").setMessage(str)  
	            // 設置內容  
	            .setPositiveButton("更新",// 設置確定按鈕  
	                    new DialogInterface.OnClickListener() {  
	                        @Override  
	                        public void onClick(DialogInterface dialog,  
	                                int which) { 
	                            m_progressDlg.setTitle("正在下載");  
	                            m_progressDlg.setMessage("請稍候...");  
	                            downFile(Common.UPDATESOFTADDRESS);  //開始下載
	                        }  
	                    })  
	            .setNegativeButton("暫不更新",  
	                    new DialogInterface.OnClickListener() {  
	                        public void onClick(DialogInterface dialog,  
	                                int whichButton) {  
	                            // 點擊"取消"按鈕之後退出程序  
	                            finish();  
	                        }  
	                    }).create();// 創建  
	    // 顯示對話框  
	    dialog.show();  
	}
		/**
		 *  提示當前為最新版本  
		 */
		private void notNewVersionDlgShow()
		{
			int verCode = Common.getVerCode(this);  
		    String verName = Common.getVerName(this); 
		    String str="當前版本:"+verName+" Code:"+verCode+",/n已是最新版,無需更新!";
		    Dialog dialog = new AlertDialog.Builder(this).setTitle("軟件更新")  
		            .setMessage(str)// 設置內容  
		            .setPositiveButton("確定",// 設置確定按鈕  
		                    new DialogInterface.OnClickListener() {  
		                        @Override  
		                        public void onClick(DialogInterface dialog,  
		                                int which) {  
		                            finish();  
		                        }  
		                    }).create();// 創建  
		    // 顯示對話框  
		    dialog.show();  
		}
		private void downFile(final String url)
		{
			m_progressDlg.show();  
		    new Thread() {  
		        public void run() {  
		            HttpClient client = new DefaultHttpClient();  
		            HttpGet get = new HttpGet(url);  
		            HttpResponse response;  
		            try {  
		                response = client.execute(get);  
		                HttpEntity entity = response.getEntity();  
		                long length = entity.getContentLength();  
		                
		                m_progressDlg.setMax((int)length);//設置進度條的最大值
		                
		                InputStream is = entity.getContent();  
		                FileOutputStream fileOutputStream = null;  
		                if (is != null) {  
		                    File file = new File(  
		                            Environment.getExternalStorageDirectory(),  
		                            m_appNameStr);  
		                    fileOutputStream = new FileOutputStream(file);  
		                    byte[] buf = new byte[1024];  
		                    int ch = -1;  
		                    int count = 0;  
		                    while ((ch = is.read(buf)) != -1) {  
		                        fileOutputStream.write(buf, 0, ch);  
		                        count += ch;  
		                        if (length > 0) {  
		                        	 m_progressDlg.setProgress(count);
		                        }  
		                    }  
		                }  
		                fileOutputStream.flush();  
		                if (fileOutputStream != null) {  
		                    fileOutputStream.close();  
		                }  
		                down();  //告訴HANDER已經下載完成了，可以安裝了
		            } catch (ClientProtocolException e) {  
		                e.printStackTrace();  
		            } catch (IOException e) {  
		                e.printStackTrace();  
		            }  
		        }  
		    }.start();  
		}
		/**
		 * 告訴HANDER已經下載完成了，可以安裝了
		 */
		private void down() {
	        m_mainHandler.post(new Runnable() {
	            public void run() {
	                m_progressDlg.cancel();
	                update();
	            }
	        });
	}
		/**
		 * 安裝程序
		 */
	    void update() {
	        Intent intent = new Intent(Intent.ACTION_VIEW);
	        intent.setDataAndType(Uri.fromFile(new File(Environment
	                .getExternalStorageDirectory(), m_appNameStr)),
	                "application/vnd.android.package-archive");
	        startActivity(intent);
	    }


}

最後是Common.java類:

類似一個工具類，很多方法都寫在這裡面，下載完成後，開始執行安裝的操作！

public class Common {
	public static final String SERVER_IP="http://192.168.1.105/";
	public static final String SERVER_ADDRESS=SERVER_IP+"try_downloadFile_progress_server/index.php";//軟件更新包地址
	public static final String UPDATESOFTADDRESS=SERVER_IP+"try_downloadFile_progress_server/update_pakage/baidu.apk";//軟件更新包地址

	/**
	 * 向服務器發送查詢請求，返回查到的StringBuilder類型數據
	 * 
	 * @param ArrayList
	 *             vps POST進來的參值對
	 * @return StringBuilder builder 返回查到的結果
	 * @throws Exception
	 */
	public static StringBuilder post_to_server(List vps) {
		DefaultHttpClient httpclient = new DefaultHttpClient();
		try {
			HttpResponse response = null;
			// 創建httpost.訪問本地服務器網址
			HttpPost httpost = new HttpPost(SERVER_ADDRESS);
			StringBuilder builder = new StringBuilder();

			httpost.setEntity(new UrlEncodedFormEntity(vps, HTTP.UTF_8));
			response = httpclient.execute(httpost); // 執行

			if (response.getEntity() != null) {
				// 如果服務器端JSON沒寫對，這句是會出異常，是執行不過去的
				BufferedReader reader = new BufferedReader(
						new InputStreamReader(response.getEntity().getContent()));
				String s = reader.readLine();
				for (; s != null; s = reader.readLine()) {
					builder.append(s);
				}
			}
			return builder;

		} catch (Exception e) {
			// TODO: handle exception
			Log.e("msg",e.getMessage());
			return null;
		} finally {
			try {
				httpclient.getConnectionManager().shutdown();// 關閉連接
				// 這兩種釋放連接的方法都可以
			} catch (Exception e) {
				// TODO Auto-generated catch block
				Log.e("msg",e.getMessage());
			}
		}
	}
	
	/**
	 * 獲取軟件版本號
	 * @param context
	 * @return
	 */
	public static int getVerCode(Context context) {
        int verCode = -1;
        try {
        	//注意："com.example.try_downloadfile_progress"對應AndroidManifest.xml裡的package="……"部分
            verCode = context.getPackageManager().getPackageInfo(
                    "com.example.try_downloadfile_progress", 0).versionCode;
        } catch (NameNotFoundException e) {
        	Log.e("msg",e.getMessage());
        }
        return verCode;
    }
   /**
    * 獲取版本名稱
    * @param context
    * @return
    */
    public static String getVerName(Context context) {
        String verName = "";
        try {
            verName = context.getPackageManager().getPackageInfo(
                    "com.example.try_downloadfile_progress", 0).versionName;
        } catch (NameNotFoundException e) {
        	Log.e("msg",e.getMessage());
        }
        return verName;   
}
	
	
	
	
	
	

已經貼完畢！