Android实现版本更新和自动安装

直接运行的项目和打包的项目apk签名不同,所以不能直接用开发工具运行项目进行版本更新.需要用apk打包安装的形式更新,否则会提示"签名冲突",无法完成覆盖安装
/**版本更新*/public class SplashActivity extends Activity {    private static final String TAG = "SplashActivity";    public static final int SHOW_UPDATE_DIALOG = 0;    public static final int SHOW_ERROR = 1;    public final static int CONNECT_TIMEOUT = 5000;    public final static int READ_TIMEOUT = 5000;    public final static int WRITE_TIMEOUT = 5000;    //获取设备名称    private String deviceName = Build.MODEL;    //获取设备序列号    private String serialNumber = getSerialNumber();    private VersionDataBean versionDataBean;    @Override    protected void onCreate(Bundle savedInstanceState) {        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_splash);         initData(); }    /**     * 初始化数据     */    private void initData() {        boolean autoUpdate = PreferenceUtils.getBoolean(this, Constants.AUTO_UPDATE, true);        if (autoUpdate) {            //版本更新,去服务器获取最新的版本,和本地版本比较            new Thread(new CheckServerVersion()).start();        } else {            //直接跳转到登录界面            load2Login();        }    }    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                /** 弹出提示更新的dialog   */                case SHOW_UPDATE_DIALOG:                    showUpdateDialog();                    break;                /** 提示错误    */                case SHOW_ERROR:                    Toast.makeText(SplashActivity.this, msg.obj+"", Toast.LENGTH_LONG).show();                    load2Login();                    break;                default:                    break;            }        }    };    /**     * 检查服务器端版本号     */    private class CheckServerVersion implements Runnable {        @Override        public void run() {            //访问网络,获取服务器端版本号            OkHttpClient client = new OkHttpClient.Builder().readTimeout(READ_TIMEOUT, TimeUnit.SECONDS).writeTimeout                    (WRITE_TIMEOUT,TimeUnit.SECONDS).connectTimeout(CONNECT_TIMEOUT, TimeUnit.SECONDS).build();            String url = new UrlInfo(SplashActivity.this).getUrl();            if (url.equals("http://null:null")) {                load2Login();            } else {                VersionDatas versionDatas = new VersionDatas();                //对象转json                final Gson gson = new Gson();                String versionDatasJson = gson.toJson(versionDatas);                FormBody body = new FormBody.Builder().add("versionDatasJson", versionDatasJson).build();                Request request = new Request.Builder().url(url).post(body).build();                client.newCall(request).enqueue(new Callback() {                    @Override                    public void onFailure(Call call, IOException e) {                        //如果连接超时则跳转到登录界面                        Message msg = Message.obtain();                        msg.what = SHOW_ERROR;                        msg.obj = "網絡異常!請檢查網絡連接狀況及設置信息";                        handler.sendMessage(msg);                    }                    @Override                    public void onResponse(Call call, Response response) throws IOException {                        if (response.isSuccessful()) {                            Log.d(TAG, "访问接口成功");                            String json = response.body().string();                            Log.d(TAG, "获取服务器端版本号json=   " + json);                            // 解析json数据                            if(versionDataBean!=null){                                versionDataBean = gson.fromJson(json, VersionDataBean.class);                                //获取到服务器端版本号,对比本地的版本号                                int serverVersionCode = versionDataBean.VERSION_NO;                                int localVersionCode = PackageUtils.getVersionCode(SplashActivity.this);                                if (serverVersionCode > localVersionCode) {                                    //服务器端版本号大于本地版本号,弹出dialog提示更新                                    Message showUpdateDialog = Message.obtain();                                    showUpdateDialog.what = SHOW_UPDATE_DIALOG;                                    handler.sendMessage(showUpdateDialog);                                } else {                                    //跳转到登录界面                                    load2Login();                                }                            }else{                                load2Login();                                Log.d(TAG,"versionDatabean为空0918");                            }                        } else {                            //跳转到登录界面                            Log.d(TAG, "访问接口失败");                            load2Login();                        }                    }                });            }        }    }    /**     * 弹出提示更新的dialog     */    private void showUpdateDialog() {        AlertDialog.Builder dialog = new AlertDialog.Builder(this);        dialog.setCancelable(false);        dialog.setTitle("版本更新提示");        dialog.setMessage("檢查到有最新版本,是否更新?");        dialog.setNegativeButton("暫不更新", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                //跳转到登录界面                load2Login();            }        });        dialog.setPositiveButton("立刻更新", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                //从服务器端下载最新apk                downloadApk();            }        });        dialog.show();    }    /**     * 从服务器端下载最新apk     */    private void downloadApk() {        //显示下载进度        ProgressDialog dialog = new ProgressDialog(this);        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);        dialog.setCancelable(false);        dialog.show();        //访问网络下载apk        new Thread(new DownloadApk(dialog)).start();    }    /**     * 访问网络下载apk     */    private class DownloadApk implements Runnable {        private ProgressDialog dialog;        InputStream is;        FileOutputStream fos;        public DownloadApk(ProgressDialog dialog) {            this.dialog = dialog;        }        @Override        public void run() {            OkHttpClient client = new OkHttpClient();            String url = versionDataBean.VERSION_URL;            Request request = new Request.Builder().get().url(url).build();            try {                Response response = client.newCall(request).execute();                if (response.isSuccessful()) {                    Log.d(TAG, "开始下载apk");                    //获取内容总长度                    long contentLength = response.body().contentLength();                    //设置最大值                    dialog.setMax((int) contentLength);                    //保存到sd卡                    File apkFile = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".apk");                    fos = new FileOutputStream(apkFile);                    //获得输入流                    is = response.body().byteStream();                    //定义缓冲区大小                    byte[] bys = new byte[1024];                    int progress = 0;                    int len = -1;                    while ((len = is.read(bys)) != -1) {                        try {                            Thread.sleep(1);                            fos.write(bys, 0, len);                            fos.flush();                            progress += len;                            //设置进度                            dialog.setProgress(progress);                        } catch (InterruptedException e) {                            Message msg = Message.obtain();                            msg.what = SHOW_ERROR;                            msg.obj = "ERROR:10002";                            handler.sendMessage(msg);                            load2Login();                        }                    }                    //下载完成,提示用户安装                    installApk(apkFile);                }            } catch (IOException e) {                Message msg = Message.obtain();                msg.what = SHOW_ERROR;                msg.obj = "ERROR:10003";                handler.sendMessage(msg);                load2Login();            } finally {                //关闭io流                if (is != null) {                    try {                        is.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                    is = null;                }                if (fos != null) {                    try {                        fos.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                    fos = null;                }            }            dialog.dismiss();        }    }    /**     * 下载完成,提示用户安装     */    private void installApk(File file) {        //调用系统安装程序        Intent intent = new Intent();        intent.setAction("android.intent.action.VIEW");        intent.addCategory("android.intent.category.DEFAULT");        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");        startActivityForResult(intent, REQUEST_INSTALL_CODE);    }    /**     * 跳转到登录界面     */    private void load2Login() {        new Thread(new Runnable() {            @Override            public void run() {                try {                    Thread.sleep(2000);                    Intent toLogin = new Intent(SplashActivity.this, LoginActivity.class);                    startActivity(toLogin);                    finish();                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }).start();    }    /**     * 跳转到主界面     */    private void load2MainActivity() {        Intent toMainActivity = new Intent(SplashActivity.this, MainActivity.class);        startActivity(toMainActivity);        finish();    }    /**     * 获取设备序列号     */    private String getSerialNumber() {        String serial = null;        try {            Class<?> c = Class.forName("android.os.SystemProperties");            Method get = c.getMethod("get", String.class);            serial = (String) get.invoke(c, "ro.serialno");        } catch (Exception e) {            e.printStackTrace();        }        return serial;    }    /**     * 封装版本升级数据     */    private class VersionDatas {        String COMMAND = "GET_APP_VERSION";        String DEVICE_NAME = deviceName;        String DEVICE_SN = serialNumber;    }}
以上实例如有不足请指出.
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