private void checkUpdate() {
    String key = SpUtil.getKey();

    Api.getApi0()
            .CheckUpdate(key, SystemUtil.getPackageInfo(this).versionCode)
            .compose(RxHelper.<CheckUpdateResult>io_main())
            .subscribe(new Subscriber<CheckUpdateResult>() {
                @Override
                public void onCompleted() {
  
                }
  
                @Override
                public void onError(Throwable e) {

                }

                @Override
                public void onNext(CheckUpdateResult checkUpdateResult) {
                    if (checkUpdateResult.getCode() == 1) {
                        CheckUpdateResult.DataEntity data = checkUpdateResult.getData();
                        showUpdate(data);
                    }
                }
            });
}
  
private void showUpdate(final CheckUpdateResult.DataEntity data) {
    if (data != null) {
        showTwoBtnDialog("更新", "v" + data.getVersionName() + "\n" + data.getUpdateInfo(), false, new IBaseActivity.OnTwoBtnClick() {
            @Override
            public void onOk() {
                final TextView[] tv = new TextView[1];
                final ProgressBar[] pb = new ProgressBar[1];
                showUpdateDialog("更新", "即将开始下载...", false, new IBaseActivity.OnOneBtnClickListener() {
                    @Override
                    public void onProgress(TextView textView, ProgressBar progressBar) {
                        tv[0] = textView;
                        pb[0] = progressBar;
                    }
  
                    @Override
                    public void onOK() {
                    }
                });
                String url = Constants.API + File.separator + data.getUrl();
                final String name = "HighNetFix_" + data.getVersionName() + "_" + data.getVersionCode() + ".apk";
                OkGo.<File>get(url)
                        .tag(this)
                        .execute(new FileCallback(Constants.APK_DOWNLOAD_PATH, name) {
                            @Override
                            public void onSuccess(Response<File> response) {
                                hideUpdateDialog();
                                ApkUtils.installApk(HomePageActivity.this, BuildConfig.APPLICATION_ID, Constants.APK_DOWNLOAD_PATH, name);
                            }
  
                            @Override
                            public void onError(Response<File> response) {
                                hideUpdateDialog();
                                ToastUtils.showCustomBgToast("下载失败，请检查您的网络设置。");
                            }
  
                            @Override
                            public void downloadProgress(Progress progress) {
                                long currentSize = progress.currentSize;
                                long totalSize = progress.totalSize;
                                int pro = (int) (currentSize * 100.0 / totalSize + 0.5f);
                                tv[0].setText("已下载：" + pro + "%");
                                pb[0].setProgress(pro);
                            }
                        });
            }
  
            @Override
            public void onCancel() {
            }
        });
    }
}

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
  
/**
 * Created by zhouzhuo810 on 2017/10/31.
 */
public class NoScrollViewPager extends ViewPager {
    public NoScrollViewPager(Context context) {
        super(context);
    }
  
    public NoScrollViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
  
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return false;
    }
  
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return true;
    }
}