android關於版本更新問題

          在Android中，檢測版本更新是每個app很常見的功能，我們也嘗試簡單實現一下吧~

佈局代碼這裏就不需要寫了，一個按鈕即可檢測更新，這裏我是以一個gson文件作爲示例請求比對版本...

第一步解析數據：

//請求網絡服務器上的版本
			final String url="http://192.168.253.2:8080/gson/banbenwenjian.json";
			 
			HttpUtils utils=new HttpUtils();
			
			utils.configTimeout(5000);
			
			utils.send(HttpMethod.GET, url, new RequestCallBack<String>() {

				@Override
				public void onFailure(HttpException arg0, String arg1) {
					// TODO Auto-generated method stub
					
				}

				@Override
				public void onSuccess(ResponseInfo<String> arg0) {
					// TODO Auto-generated method stub
					
					mNetData = arg0.result;
					Gson gson=new Gson();
					banben = gson.fromJson(mNetData, Banben.class);
					mUrl1 = banben.getUrl();
					mName = banben.getName();
					mVersion = banben.getVersion();
					
					handler.sendEmptyMessage(0);
				}
			});

handler接受  通過構造方法將數據傳到UpdateManager類

private Handler handler=new Handler(){
		public void handleMessage(android.os.Message msg) {
			Log.d("u", mUrl1+mName+mVersion);
			UpdateManager manager = new UpdateManager(getActivity(),mUrl1,mName,mVersion);
			manager.checkUpdate();
		};
	};

-------------------------解析bean類------------

獲取版本號  下載地址和名稱

public class Banben implements Serializable{
	
	private String version;
	private String name;
	private String url;
	public String getVersion() {
		return version;
	}
	public void setVersion(String version) {
		this.version = version;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getUrl() {
		return url;
	}
	public void setUrl(String url) {
		this.url = url;
	}
	@Override
	public String toString() {
		return "Banben [version=" + version + ", name=" + name + ", url=" + url
				+ "]";
	}
	

}

-----------------------------UpdateManager-------------------

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 java.util.ArrayList;
import com.hao.happyshoppingapp.R;
import com.seven.bean.Banben;

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.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;
public class UpdateManager {
	/* 下載中 */
	private static final int DOWNLOAD = 1;
	/* 下載結束 */
	private static final int DOWNLOAD_FINISH = 2;
	/* 下載保存路徑 */
	private String mSavePath;
	/* 記錄進度條數量 */
	private int progress;
	/* 是否取消更新 */
	private boolean cancelUpdate = false;
	
	private Context mContext;
	/* 更新進度條 */
	private ProgressBar mProgress;
	private Banben banben;
	private Dialog mDownloadDialog;
	private String url1;
	private String name;
	private String version;
	
	private Handler mHandler = new Handler()
	{
		public void handleMessage(Message msg)
		{
			switch (msg.what)
			{
			// 正在下載
			case DOWNLOAD:
				// 設置進度條位置
				mProgress.setProgress(progress);
				break;
			case DOWNLOAD_FINISH:
				// 安裝文件
				installApk();
				break;
			default:
				break;
			}
		};
	};

	

	public UpdateManager(Context mContext, String url1, String name,
			String version) {
		super();
		this.mContext = mContext;
		this.url1 = url1;
		this.name = name;
		this.version = version;
	}

	/**
	 * 檢測軟件更新
	 */
	public void checkUpdate()
	{
		if (isUpdate())
		{
			showNoticeDialog();
			// 顯示提示對話框
		} else
		{
			Toast.makeText(mContext, R.string.soft_update_no, Toast.LENGTH_LONG).show();
		}
	}

	/**
	 * 檢查軟件是否有更新版本
	 * 
	 * @return
	 */
	private boolean isUpdate()
	{
		// 獲取當前軟件版本
		int versionCode = getVersionCode(mContext);
		Log.d("versionCode", versionCode+"");
		
		
		if (null != name)
		{
			int serviceCode = Integer.valueOf(version);
			// 版本判斷
			if (serviceCode > versionCode)
			{
				return true;
			}
		}
		return false;
	}

	private void request_serverban() {
		// TODO Auto-generated method stub
		Toast.makeText(mContext, "執行到了", 0).show();
		
	}

	/**
	 * 獲取軟件版本號
	 * 
	 * @param context
	 * @return
	 */
	private int getVersionCode(Context context)
	{
		int versionCode = 0;
		try
		{
			// 獲取軟件版本號，對應AndroidManifest.xml下android:versionCode
			versionCode = context.getPackageManager().getPackageInfo("com.hao.happyshoppingapp", 0).versionCode;
		} catch (NameNotFoundException e)
		{
			e.printStackTrace();
		}
		return versionCode;
	}

	/**
	 * 顯示軟件更新對話框
	 */
	private void showNoticeDialog()
	{
		// 構造對話框
		AlertDialog.Builder builder = new Builder(mContext);
		builder.setTitle(R.string.soft_update_title);
		builder.setMessage(R.string.soft_update_info);
		// 更新
		builder.setPositiveButton(R.string.soft_update_updatebtn, new OnClickListener()
		{
			@Override
			public void onClick(DialogInterface dialog, int which)
			{
				dialog.dismiss();
				// 顯示下載對話框
				showDownloadDialog();
			}
		});
		// 稍後更新
		builder.setNegativeButton(R.string.soft_update_later, new OnClickListener()
		{
			@Override
			public void onClick(DialogInterface dialog, int which)
			{
				dialog.dismiss();
			}
		});
		Dialog noticeDialog = builder.create();
		noticeDialog.show();
	}

	/**
	 * 顯示軟件下載對話框
	 */
	private void showDownloadDialog()
	{
		// 構造軟件下載對話框
		AlertDialog.Builder builder = new Builder(mContext);
		builder.setTitle(R.string.soft_updating);
		// 給下載對話框增加進度條
		final LayoutInflater inflater = LayoutInflater.from(mContext);
		View v = inflater.inflate(R.layout.softupdate_progress, null);
		mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
		builder.setView(v);
		// 取消更新
		builder.setNegativeButton(R.string.soft_update_cancel, new OnClickListener()
		{
			@Override
			public void onClick(DialogInterface dialog, int which)
			{
				dialog.dismiss();
				// 設置取消狀態
				cancelUpdate = true;
			}
		});
		mDownloadDialog = builder.create();
		mDownloadDialog.show();
		// 現在文件
		downloadApk();
	}

	/**
	 * 下載apk文件
	 */
	private void downloadApk()
	{
		// 啓動新線程下載軟件
		new downloadApkThread().start();
	}

	/**
	 * 下載文件線程
	 * 
	 * @author coolszy
	 *@date 2012-4-26
	 *@blog http://blog.92coding.com
	 */
	private class downloadApkThread extends Thread
	{
		@Override
		public void run()
		{
			try
			{
				// 判斷SD卡是否存在，並且是否具有讀寫權限
				if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
				{
					// 獲得存儲卡的路徑
					String sdpath = Environment.getExternalStorageDirectory() + "/";
					mSavePath = sdpath + "download";
					URL url = new URL(url1);
					// 創建連接
					HttpURLConnection conn = (HttpURLConnection) url.openConnection();
					conn.connect();
					// 獲取文件大小
					int length = conn.getContentLength();
					// 創建輸入流
					InputStream is = conn.getInputStream();

					File file = new File(mSavePath);
					// 判斷文件目錄是否存在
					if (!file.exists())
					{
						file.mkdir();
					}
					File apkFile = new File(mSavePath, name);
					FileOutputStream fos = new FileOutputStream(apkFile);
					int count = 0;
					// 緩存
					byte buf[] = new byte[1024];
					// 寫入到文件中
					do
					{
						int numread = is.read(buf);
						count += numread;
						// 計算進度條位置
						progress = (int) (((float) count / length) * 100);
						// 更新進度
						mHandler.sendEmptyMessage(DOWNLOAD);
						if (numread <= 0)
						{
							// 下載完成
							mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
							break;
						}
						// 寫入文件
						fos.write(buf, 0, numread);
					} while (!cancelUpdate);// 點擊取消就停止下載.
					fos.close();
					is.close();
				}
			} catch (MalformedURLException e)
			{
				e.printStackTrace();
			} catch (IOException e)
			{
				e.printStackTrace();
			}
			// 取消下載對話框顯示
			mDownloadDialog.dismiss();
		}
	};

	/**
	 * 安裝APK文件
	 */
	private void installApk()
	{
		File apkfile = new File(mSavePath, name);
		if (!apkfile.exists())
		{
			return;
		}
		// 通過Intent安裝APK文件
		Intent i = new Intent(Intent.ACTION_VIEW);
		i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");
		mContext.startActivity(i);
	}
}

重要方法在上面那個類都有註釋到  可以看一看 都是有用的一些方法~~

//資源分享

string.xml

    <string name="soft_update_no">已經是最新版本</string>
    <string name="soft_update_title">軟件更新</string>
    <string name="soft_update_info">檢測到新版本，立即更新嗎</string>
    <string name="soft_update_updatebtn">更新</string>
    <string name="soft_update_later">稍後更新</string>
    <string name="soft_updating">正在更新</string>
    <string name="soft_update_cancel">取消</string>

//進度條佈局

-----------softupdate_progress.xml--------------

<?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/update_progress"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		style="?android:attr/progressBarStyleHorizontal" />
</LinearLayout>

最後給大家展示一下服務器上的gson文件,我是用tomcat服務器作爲測試的，當然也可以隨你的意願了

{
    "name": "HappyShopping",
    "url": "http://192.168.253.2:8080/anzhuangbao/HappyShoppingApp.apk",
    "version": 2
}

哦！！！忘記添加權限了~

     <uses-permission android:name="android.permission.INTERNET" />
    <!-- 寫入擴展存儲，向擴展卡寫入數據，用於寫入 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
    </uses-permission>
    <!-- SD卡讀取權限，用戶寫入離線定位數據 -->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" >
    </uses-permission>