Android版本更新（适配8.0）

1.检测版本

private void checkVersion() {
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
            .url(NetUtils.checkveision+"/"+packageCode(this)+"/1")
            .build();
    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
        }
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            if (response.isSuccessful()) {//回调的方法执行在子线程。
                final String info=response.body().string();
                final CheckBean rdb= new Gson().fromJson(info, CheckBean.class);
                if(1000==(rdb.getCode())){
                    runOnUiThread(new Runnable()
                    {
                        public void run() {
                             if(rdb.getData().isUpdateFlag()){
                                     normalUpdate(MainActivity.this,rdb);
                             }
                        }
                    }); } } }}); }

 2，弹出更新提示

 /**
     * 正常升级，用户可以选择是否取消升级
     *
     * @param context
     */
    private void normalUpdate(final Context context,final CheckBean cb) {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        View view = View.inflate(this, R.layout.gengxindialog, null);
        builder.setView(view);
        builder.setCancelable(true);
        final   Button btn_cancel=(Button)view.findViewById(R.id.btn_cancel);//取消按钮
        final   Button btn_comfirm=(Button)view.findViewById(R.id.btn_comfirm);//确定按钮
        //取消或确定按钮监听事件处理
       final AlertDialog dialog = builder.create();
        dialog.show();
        btn_comfirm.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                startDownload(cb.getData().getAppUrl().toString(),btn_comfirm);
            }
        });
        btn_cancel.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                dialog.dismiss();
               Log.i(TAG, "btn_cancel");
            }
        });
    }

3，开启下载进程

 private String getDownloadPathName() {
        String cacheDir = getExternalCacheDir().getAbsolutePath();
        String path = cacheDir + "/" + "比特未来" + ".apk";
        return path;
    }
private void startDownload(String url,final Button bt) {
       if(null==url){
           return;
       }
    String path = getDownloadPathName();
    File file = new File(path);
    if (file != null && file.exists()) {
        file.delete();
    }
    FileDownloader.getImpl().create(url)
            .setPath(path)
            .setListener(new FileDownloadListener() {
                @Override
                protected void pending(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                    Log.i(TAG, "pending");
                }
                @Override
                protected void progress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                   // soFarBytes * 100 / totalBytes + "%"
                    bt.setText(soFarBytes * 100 / totalBytes + "%");
                }
                @Override
                protected void completed(BaseDownloadTask task) {
                    //下载完成
                    Log.i(TAG, "completed");
                    bt.setText("下载完成");
                    Toast.makeText(MainActivity.this, "下载完成", Toast.LENGTH_SHORT).show();
                    installProcess();
                }
                @Override
                protected void paused(BaseDownloadTask task, int soFarBytes, int totalBytes) {
                    Log.i(TAG, "paused");
                }
                @Override
                protected void error(BaseDownloadTask task, Throwable e) {
                    Log.i(TAG, "error");
                }

                @Override
                protected void warn(BaseDownloadTask task) {
                    Log.i(TAG, "warn");
                }
            }).start();
}

 4，8.0安装权限处理

//安装应用的流程
private void installProcess() {
    boolean haveInstallPermission;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        //先获取是否有安装未知来源应用的权限
        haveInstallPermission = getPackageManager().canRequestPackageInstalls();
        if (!haveInstallPermission) {//没有权限

            AlertDialog.Builder normalDialog =
                    new AlertDialog.Builder(MainActivity.this);
            normalDialog.setIcon(R.drawable.logo);
            normalDialog.setTitle("安装应用");
            normalDialog.setMessage("安装应用需要打开未知来源权限，请去设置中开启权限");
            normalDialog.setPositiveButton("确定",
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                                startInstallPermissionSettingActivity();
                        }
                    });
            normalDialog.show();
            return;
        }
    }
    //有权限，开始安装应用程序
    installApk();
}
@RequiresApi(api = Build.VERSION_CODES.O)
private void startInstallPermissionSettingActivity() {
    Uri packageURI = Uri.parse("package:" + getPackageName());
    //注意这个是8.0新API
    Intent intent = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES, packageURI);
    startActivityForResult(intent, 10086);
}



@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    Log.e(TAG, "onActivityResult: ");
    if (resultCode == RESULT_OK ) {
        installApk();
        
    }
    super.onActivityResult(requestCode, resultCode, data);
}

5，安装应用

private void installApk() {
        File apkFile = new File(getDownloadPathName());
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if (Build.VERSION.SDK_INT >= 24) { //判读版本是否在7.0以上
            //参数1 上下文, 参数2 Provider主机地址 和配置文件中保持一致   参数3  共享的文件
            Uri apkUri = FileProvider.getUriForFile(MainActivity.this, "com.example.btft" + ".fileprovider", apkFile);
            //添加这一句表示对目标应用临时授权该Uri所代表的文件
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
        } else {
            intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
        }
        startActivity(intent);
    }

7.0文件权限配置

AndroidManifest 

file_paths.xml