版本更新邏輯

1赁还、聯(lián)網(wǎng)妖泄，從遠(yuǎn)程服務(wù)器獲取最新的版本，然后跟本地的版本號比對艘策，如果遠(yuǎn)程的版本號大于本地的版本號蹈胡，彈出對話框，有新版本朋蔫，如果相等罚渐，已經(jīng)是最新版本，不需要更新驯妄，本地版本號不可能比遠(yuǎn)程版本好大荷并，

1、立刻升級
點(diǎn)擊立刻升級青扔，把最新的apk下載下來源织，然后提示更新安裝。
2微猖、稍后再說
點(diǎn)擊稍后再說谈息，立即進(jìn)入主界面。

3凛剥、版本名侠仇、版本號
1、versionCode：給程序員看的
2、versionName：給用戶看的
3逻炊、版本名規(guī)則：eg互亮。6.1.3
1、6.1.C：小版本更新余素，修改了小bug豹休，做一些微調(diào)
2、6.B.3：中等版本更新桨吊，更改了比較重要的bug慕爬，添加新功能
3、A.1.3：大版本更新屏积，很重要的更新医窿，里程碑意義的更新。

實(shí)戰(zhàn)
D:\Software-tools\Tomcat\webapps\ROOT\update.txt
里面新建文本update模擬遠(yuǎn)程版本炊林，在update文本里面寫上json格式的數(shù)據(jù):

{"remoteVesion":"2"}  //版本號為：2

訪問成功：

異常處理的原則

1姥卢、如果有統(tǒng)一的解決方案，就在方法內(nèi)部try catch掉
2渣聚、如果每次調(diào)用處理異常的方式都不同独榴，就直接往外拋（誰調(diào)用，誰處理）

版本更新demo

SplashActivity

public class SplashActivity extends Activity {

    private static final String TAG = "SplashActivity";
    
    private static final int REQUEST_CODE = 100;
    //錯(cuò)誤碼
    protected static final int NET_ERROR = 1001;

    protected static final int NET_KEEP = 1002;
    
    private TextView tv_version;
    private ProgressDialog progressDialog;
    
    Handler mHandler = new Handler(){
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
            case NET_ERROR:
                Toast.makeText(getApplicationContext(), "網(wǎng)絡(luò)錯(cuò)誤奕枝！", Toast.LENGTH_SHORT).show();
                enterHome();
                break;
            case NET_KEEP:
                Toast.makeText(getApplicationContext(), "服務(wù)器正在維護(hù)棺榔！", Toast.LENGTH_SHORT).show();
                enterHome();
                break;

            default:
                break;
            }
            
        };
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);

        tv_version = (TextView) findViewById(R.id.splash_tv_version);
        // 設(shè)置版本名
        initVersionName();
        //版本更新
        updateVersion();
    }

    private void updateVersion() {
        final String url = "http://192.168.39.50:8080/update.txt";
        //1.訪問服務(wù)器，獲取最新版本信息
        new Thread(new Runnable() {
            
            @Override
            public void run() {
                 //01. 定義okhttp
//              OkHttpClient okHttpClient_get = new OkHttpClient();
                //設(shè)置連接超時(shí)時(shí)間
                OkHttpClient okHttpClient_get = new OkHttpClient.Builder().connectTimeout(3, TimeUnit.SECONDS).build();
                //02.請求體
                Request request = new Request.Builder()
                    .get()//get請求方式
                    .url(url)//網(wǎng)址
                    .build();
                    
                //03.執(zhí)行okhttp
                Response response;
                try {
                    response = okHttpClient_get.newCall(request).execute();
                    
                    /**
                     * 打印數(shù)據(jù),注意一次請求隘道，一次響應(yīng)症歇，讀取一次就沒了，要注釋掉
                     */
//                  System.out.println(response.body().string());
                    String json = response.body().string();
                    //001.解析
                    //{"remoteVesion":"2","desc":"1.添加了搖一搖的功能\n2.優(yōu)化了用戶的體驗(yàn)","apkUrl":"http://192.168.39.50:8080/safenet.apk"}
                    JSONObject jsonObject = new JSONObject(json);
                    
                    int remoteVesion = jsonObject.getInt("remoteVesion");
                    String desc = jsonObject.getString("desc");
                    String url = jsonObject.getString("apkUrl");
                    
                    final UpdateInfo updateInfo = new UpdateInfo();
                    updateInfo.remoteVesion = remoteVesion;
                    updateInfo.desc = desc;
                    updateInfo.apkUrl = url;
                    
                    //2.判斷最新版本與本地是否一致
                    int localVersion = PackageUtil.getVersionCode(getApplicationContext());
                    if (remoteVesion > localVersion) {
                        //3.彈出提示dialog
                        //不能在子線程中更新UI
                        runOnUiThread(new Runnable() {
                            
                            @Override
                            public void run() {
                                showUpdateDialog(updateInfo);
                            }
                        });
                        
                    }else{
                        //跳轉(zhuǎn)到主頁 
                        enterHome();
                    }
                } catch (IOException e) {
                    Message message = mHandler.obtainMessage();
                    message.what = NET_ERROR;
                    message.sendToTarget();
                    
                    e.printStackTrace();
                } catch (JSONException e) {
                    Message message = mHandler.obtainMessage();
                    message.what = NET_KEEP;
                    message.sendToTarget();
                    
                    e.printStackTrace();
                }
                
            }
        }).start();
        
    }
    //進(jìn)入主頁
    protected void enterHome() {
        mHandler.postDelayed(new Runnable() {
            
            @Override
            public void run() {
                Intent intent = new Intent(SplashActivity.this, HomeActivity.class);
                startActivity(intent);  
            }
        }, 2000);
        
    }

    private void showUpdateDialog(final UpdateInfo info) {
        AlertDialog.Builder builder = new Builder(SplashActivity.this);
        builder.setTitle("版本更新提示");
        builder.setCancelable(false);//點(diǎn)擊旁邊不能消失
        builder.setMessage(info.desc);
        
        //4.是否升級
        builder.setPositiveButton("立刻升級", new OnClickListener() {
            
            @Override
            public void onClick(DialogInterface dialog, int which) {
                
                downApk(info);
            }
        });
        builder.setNegativeButton("稍后再說", new OnClickListener() {
            
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //回到主頁
                enterHome();
                
            }
        });
        builder.show();
    }

    protected void downApk(UpdateInfo info) {
        //5.下載最新APK
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            
            progressDialog = new ProgressDialog(this);
            progressDialog.setCancelable(false);
            progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            progressDialog.show();
            
            new Thread(new DownTask(info.apkUrl)).start();
        }else{
            //回到主頁
            Toast.makeText(this, "沒有SD卡谭梗！", Toast.LENGTH_SHORT).show();
            enterHome();
        }
    
    }
    
    class DownTask implements Runnable{
        
        String mUrl;
        
        public DownTask(String apkUrl) {
            this.mUrl = apkUrl;
        }

        @Override
        public void run() {
            InputStream is = null;
            FileOutputStream fos = null;
            try {
                Response response = HttpUtil.get(mUrl);
                is = response.body().byteStream();
                
                long contentLength = response.body().contentLength();
                //01.設(shè)置進(jìn)度條最大值
                progressDialog.setMax((int) contentLength);
                //路徑：mnt/sdcard/
                File file = new File(Environment.getExternalStorageDirectory(), "safe.apk");
                fos = new FileOutputStream(file);
                
                byte[] buffer = new byte[1024];
                
                int len = -1;
                
                int progress = 0;
                while((len = is.read(buffer)) != -1){
                    fos.write(buffer, 0, len);
                    
//                  SystemClock.sleep(10);
                    progress += len;
                    //02.設(shè)置進(jìn)度
                    progressDialog.setProgress(progress);
                }
                
                fos.flush();
                //03.進(jìn)度條消失
                progressDialog.dismiss();
                //6.提示用戶安裝 
                installApk(file);
            } catch (IOException e) {
                Message message = mHandler.obtainMessage();
                message.what = NET_ERROR;
                message.sendToTarget();
                e.printStackTrace();
            } finally{
                closeIo(fos);
                closeIo(is);
//              closeIo2(fos,is);
            }
        }
        
    }
    
    public void closeIo(Closeable io){
        if (io != null) {
            try {
                io.close();
                io = null;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    public void installApk(File file) {
//       <intent-filter>
//         <action android:name="android.intent.action.VIEW" />
//         <category android:name="android.intent.category.DEFAULT" />
//         <data android:scheme="content" />
//         <data android:scheme="file" />
//         <data android:mimeType="application/vnd.android.package-archive" />
//     </intent-filter>
        //7.安裝APK
        Intent intent = new Intent();
        intent.addCategory("android.intent.category.DEFAULT");
        intent.setAction("android.intent.action.VIEW");
        //獲取文件的uri
        Uri data = Uri.fromFile(file);
        intent.setDataAndType(data, "application/vnd.android.package-archive");
//      startActivity(intent);
        startActivityForResult(intent, REQUEST_CODE);
        
    }
    
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE) {
            //系統(tǒng)默認(rèn)的用戶行為只有兩種：yes no
            switch (resultCode) {
            case Activity.RESULT_OK:
                //***被覆蓋安裝了忘晤，所以不會(huì)出日志
                Log.d(TAG, "RESULT_OK");
                break;
            case Activity.RESULT_CANCELED:
                Log.d(TAG, "RESULT_CANCELED");
                //進(jìn)入到主頁
                enterHome();
                break;

            default:
                break;
            }
            
        }
    }

    public void closeIo2(Closeable... io){
        for (int i = 0; i < io.length; i++) {
            if(io[i] != null){
                try {
                    io[i].close();
                    io[i] = null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    private void initVersionName() {

        // PackageManager pm = this.getPackageManager();
        // /**
        // * flags:標(biāo)志位，0標(biāo)志包的基本信息
        // */
        // try {
        // PackageInfo info = pm.getPackageInfo(getPackageName(), 0);
        // String versionName = info.versionName;
        //
        // tv_version.setText(versionName);
        // } catch (NameNotFoundException e) {
        // e.printStackTrace();
        // }
        
        String versionName = PackageUtil.getVersionName(this);
        tv_version.setText(versionName);

    }
}

UpdateInfo

public class UpdateInfo {
    
    public int remoteVesion;//遠(yuǎn)程版本號
    public String desc;//版本描述
    public String apkUrl;//apk的下載地址
}

HttpUtil

public class HttpUtil {
    
    public static Response get(String url) throws IOException{
         //01. 定義okhttp
        OkHttpClient okHttpClient_get = new OkHttpClient();
        //02.請求體
        Request request = new Request.Builder()
            .get()//get請求方式
            .url(url)//網(wǎng)址
            .build();
            
        //03.執(zhí)行okhttp
        Response response = okHttpClient_get.newCall(request).execute();
        
        return response;
    }       
}

public class PackageUtil {
    
    public static String getVersionName(Context context){
        
        PackageManager pm = context.getPackageManager();
        /**
         * flags:標(biāo)志位激捏，0標(biāo)志包的基本信息
         */
        try {
            PackageInfo info = pm.getPackageInfo(context.getPackageName(), 0);
            String versionName = info.versionName;
            return versionName;
        } catch (NameNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "未知版本名";
    }
    
    public static int getVersionCode(Context context){
        
        PackageManager pm = context.getPackageManager();
        /**
         * flags:標(biāo)志位设塔，0標(biāo)志包的基本信息
         */
        try {
            PackageInfo info = pm.getPackageInfo(context.getPackageName(), 0);
            int versionCode = info.versionCode;
            
            return versionCode;
        } catch (NameNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return 1;
    }
}