小编Al-*_*min的帖子

我试图将两个按钮放置在约束布局的底部。在 Android Studio 的设计视图中，一切看起来都不错，但是当我在调试中运行应用程序时，按钮看起来像是与屏幕顶部的最后一个字段对齐。我已经尝试过指南和障碍，但无法让障碍在我的工作室版本（3.0.1）中工作。如果我尝试按下显示屏顶部的按钮，当我切换到横向模式时它们就会消失。有什么建议，或者我应该在这个问题上采用另一种类型的布局吗？谢谢

我的设计图

我的代码：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
android:id="@+id/location_detail"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">

<android.support.constraint.Guideline
    android:id="@+id/guideline"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    app:layout_constraintGuide_begin="10dp"
    app:layout_constraintHeight_min="?attr/actionBarSize"
    app:layout_constraintTop_toTopOf="parent"/>


<TextView
    android:id="@+id/location_name_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:labelFor="@+id/location_name"
    android:text="@string/location_name_title"
    app:layout_constraintBaseline_toBaselineOf="@+id/location_name"
    app:layout_constraintLeft_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/guideline"/>

<EditText
    android:id="@+id/location_name"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:ems="13"
    android:inputType="textPersonName"
    app:layout_constraintLeft_toRightOf="@+id/guideline2"
    app:layout_constraintTop_toBottomOf="@+id/guideline"/>

<TextView
    android:id="@+id/location_region_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/location_region_title"
    app:layout_constraintBaseline_toBaselineOf="@+id/location_region"
    app:layout_constraintLeft_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/location_name_title"/>

<TextView
    android:id="@+id/location_region"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:text="@string/location_detail_region"
    app:layout_constraintLeft_toRightOf="@+id/guideline2"
    app:layout_constraintTop_toBottomOf="@+id/location_name"/>

<TextView
    android:id="@+id/location_country_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/location_country_title"
    app:layout_constraintBaseline_toBaselineOf="@+id/location_country"
    app:layout_constraintLeft_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/location_region_title"/>

<TextView
    android:id="@+id/location_country"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:text="@string/location_detail_country"
    app:layout_constraintLeft_toRightOf="@+id/guideline2"
    app:layout_constraintTop_toBottomOf="@+id/location_region"/>

<TextView
    android:id="@+id/location_latitude_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/location_detail_latitude" …

我已经将 WorkManagerUUID转换为StringRealm 数据库。

这是代码 -

Constraints constraints = new Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build();
            Data inputData = new Data.Builder().putString("downloadUrl", downloadUrl).
                    putString("destinationFolder", destinationFolder).
                    putInt("suraNumber", Integer.parseInt(suraNumber)).
                    putString("fileName", fileName).
                    putBoolean("downloadFileTypeBangla", downloadFileTypeBangla).
                    putBoolean("downloadFileTypeArabic", downloadFileTypeArabic).
                    putBoolean("downloadFileTypeArabicWithBangla", downloadFileTypeArabicWithBangla).build();
            OneTimeWorkRequest downloadWork = new OneTimeWorkRequest.Builder(DownloadWorker.class).setConstraints(constraints).setInputData(inputData).build();
            WorkManager.getInstance().enqueue(downloadWork);

            Sura sura = dbOperations.getSuraById(Integer.parseInt(suraNumber));
            if(sura != null){
                dbOperations.updateSura(sura, Integer.parseInt(suraNumber), sura.getBnAudioDownloadStatus(), sura.getArAudioDownloadStatus(), 1);
                realm.beginTransaction();
                DownloadStatusModel downloadStatusModel = new DownloadStatusModel();
                downloadStatusModel.setId(new RealmCommonService(realm).newId(DownloadStatusModel.class));
                downloadStatusModel.setDownloadFileType("ArabicWithBangla");
                downloadStatusModel.setActiveStatus(true);
                downloadStatusModel.setDownloadDate(new Date());
                downloadStatusModel.setDownloadedSuraNo(sura.getSuraNo());
                downloadStatusModel.setDownloadFileSize(sura.getArBnAudioFileSize());
                downloadStatusModel.setDownloadReferenceId(downloadWork.getId().toString());
                downloadStatusModel.setDownloadedSuraNameBangla(sura.getSuraNameBangla());
                downloadStatusModel.setDownloadStatus(1);
                realm.copyToRealm(downloadStatusModel);
                realm.commitTransaction();
            }

现在我试图取消Work使用这行代码，但没有奏效。

WorkManager.getInstance().cancelWorkById(UUID.fromString(downloadStatusModel.getDownloadReferenceId()));

任何帮助，将不胜感激

谢谢