android - 如何设置相对布局的布局参数？

Question

我正在使用 Android Studio 创建一个应用程序。用户将从三个按钮的列表中选择一个按钮，这会将他们带到一个名为 SurveyActivity 的新 Activity。在 SurveyActivity 中，有一些与内容相关的布局。但根据按下哪个按钮，并非所有相关布局都会出现。相对布局相互链接，因为它们在另一个之下。

我遇到的问题是，当某些视图是 View.GONE 时，您无法访问 android:layout_below 的 ID

我已经尝试过这篇文章，但我似乎不明白你为什么使用布局参数。

我知道如果你使用 LinearLayout 你可以做到，但我想知道是否有办法用相对布局做到这一点。

这是调查活动：

public class SurveyActivity extends AppCompatActivity {

String timeOfDay;

private RelativeLayout relativeLayoutMentally, relativeLayoutPhysically, relativeLayoutEnergised,
        relativeLayoutMotivated, relativeLayoutAlert, relativeLayoutSatisfied, relativeLayoutCalm;



@Override
@TargetApi(17)
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_survey);
    // Initalisation

    relativeLayoutMentally = (RelativeLayout)findViewById(R.id.mentally);
    relativeLayoutPhysically = (RelativeLayout)findViewById(R.id.physically);
    relativeLayoutEnergised = (RelativeLayout)findViewById(R.id.energised);
    relativeLayoutMotivated = (RelativeLayout)findViewById(R.id.motivated);
    relativeLayoutAlert = (RelativeLayout)findViewById(R.id.alert);
    relativeLayoutSatisfied = (RelativeLayout)findViewById(R.id.satisfied);
    relativeLayoutCalm = (RelativeLayout)findViewById(R.id.calm);

    relativeLayoutMentally.setVisibility(View.VISIBLE);
    relativeLayoutPhysically.setVisibility(View.VISIBLE);
    relativeLayoutSatisfied.setVisibility(View.VISIBLE);

    // Intent

    Intent intent = getIntent();
    timeOfDay = intent.getStringExtra("Time of Day");


    switch(timeOfDay){
        case "Morning":



            relativeLayoutEnergised.setVisibility(View.VISIBLE);
        relativeLayoutMotivated.setVisibility(View.VISIBLE);
        relativeLayoutAlert.setVisibility(View.VISIBLE);
        relativeLayoutCalm.setVisibility(View.GONE);

            break;
        case "Afternoon":

            relativeLayoutEnergised.setVisibility(View.VISIBLE);
            relativeLayoutMotivated.setVisibility(View.VISIBLE);
            relativeLayoutAlert.setVisibility(View.VISIBLE);
            relativeLayoutCalm.setVisibility(View.GONE);

            break;
        case "Evening":

            relativeLayoutEnergised.setVisibility(View.GONE);
            relativeLayoutMotivated.setVisibility(View.GONE);
            relativeLayoutAlert.setVisibility(View.GONE);
            relativeLayoutCalm.setVisibility(View.VISIBLE);

            break;

    }

}
}

这是调查的xml文件：

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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"
    tools:context="com.example.android.happinesssurvey.SurveyActivity">



        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <RelativeLayout
                android:id="@+id/mentally"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <SeekBar
                    android:id="@+id/seekBarMentally"
                    style="@style/Widget.AppCompat.SeekBar.Discrete"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_alignParentStart="true"
                    android:layout_below="@+id/questionMentally"
                    android:layout_marginTop="23dp"
                    android:max="10"
                    android:padding="10dp"
                    android:progress="5" />

                <TextView
                    android:id="@+id/questionMentally"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="@string/question_mentally" />

                <TextView
                    android:id="@+id/label_mentally"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text=""/>


            </RelativeLayout>

            <RelativeLayout
                android:id="@+id/physically"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <!--android:layout_below="@+id/mentally"-->

                <SeekBar
                    android:id="@+id/seekBarPhysically"
                    style="@style/Widget.AppCompat.SeekBar.Discrete"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_alignParentStart="true"
                    android:layout_below="@+id/questionPhysically"
                    android:layout_marginTop="23dp"
                    android:max="10"
                    android:padding="10dp"
                    android:progress="5" />

                <TextView
                    android:id="@+id/questionPhysically"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="@string/question_physically" />

                <TextView
                    android:id="@+id/label_physically"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text=""/>


            </RelativeLayout>


        <RelativeLayout
            android:id="@+id/energised"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <!--android:layout_below="@id/physically">-->

            <SeekBar
                android:id="@+id/seekBarEnergised"
                style="@style/Widget.AppCompat.SeekBar.Discrete"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_below="@+id/questionEnergised"
                android:layout_marginTop="23dp"
                android:max="10"
                android:padding="20dp"
                android:progress="5" />

            <TextView
                android:id="@+id/questionEnergised"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/question_energised" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:layout_below="@+id/questionEnergised"
                android:gravity="fill_horizontal">

                <TextView
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="10dp"
                    android:layout_marginStart="10dp"
                    android:layout_marginEnd="220dp"
                    android:layout_marginRight="220dp"
                    android:text="@string/label_unenergised" />

                <TextView
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:text="@string/label_energised" />

            </LinearLayout>


        </RelativeLayout>



        <RelativeLayout
            android:id="@+id/motivated"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <!--android:layout_below="@id/energised">-->

            <SeekBar
                android:id="@+id/seekBarMotivated"
                style="@style/Widget.AppCompat.SeekBar.Discrete"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_below="@+id/questionMotivated"
                android:layout_marginTop="23dp"
                android:max="10"
                android:padding="20dp"
                android:progress="5" />

            <TextView
                android:id="@+id/questionMotivated"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/question_motivated" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:layout_below="@+id/questionMotivated"
                android:gravity="fill_horizontal">

                <TextView
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="10dp"
                    android:layout_marginRight="220dp"
                    android:layout_marginStart="10dp"
                    android:layout_marginEnd="220dp"
                    android:text="@string/label_unmotivated" />

                <TextView
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:text="@string/label_motivated" />

            </LinearLayout>


        </RelativeLayout>


        <RelativeLayout
            android:id="@+id/satisfied"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <!--android:layout_below="@id/motivated">-->

            <SeekBar
                android:id="@+id/seekBarSatisfied"
                style="@style/Widget.AppCompat.SeekBar.Discrete"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_below="@+id/questionSatisifed"
                android:layout_marginTop="23dp"
                android:max="10"
                android:padding="20dp"
                android:progress="5" />

            <TextView
                android:id="@+id/questionSatisifed"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/question_satisifed" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:layout_below="@+id/questionSatisifed"
                android:gravity="fill_horizontal">

                <TextView
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="10dp"
                    android:layout_marginRight="220dp"
                    android:layout_marginStart="10dp"
                    android:layout_marginEnd="220dp"
                    android:text="@string/label_unsatisfied" />

                <TextView
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:text="@string/label_satisfied" />

            </LinearLayout>


        </RelativeLayout>



        <RelativeLayout
            android:id="@+id/alert"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <!--android:layout_below="@id/satisfied">-->

            <SeekBar
                android:id="@+id/seekBarAlert"
                style="@style/Widget.AppCompat.SeekBar.Discrete"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_below="@+id/questionAlert"
                android:layout_marginTop="23dp"
                android:max="10"
                android:padding="20dp"
                android:progress="5" />

            <TextView
                android:id="@+id/questionAlert"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/question_alert" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="30dp"
                android:layout_below="@+id/questionAlert"
                android:gravity="fill_horizontal">

                <TextView
                    android:layout_width="80dp"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="10dp"
                    android:layout_marginRight="220dp"
                    android:layout_marginStart="10dp"
                    android:layout_marginEnd="220dp"
                    android:text="@string/label_not_alert" />

                <TextView
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:text="@string/label_alert" />

            </LinearLayout>


        </RelativeLayout>

            <RelativeLayout
                android:id="@+id/calm"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
                <!--android:layout_below="@id/alert">-->

                <SeekBar
                    android:id="@+id/seekBarCalm"
                    style="@style/Widget.AppCompat.SeekBar.Discrete"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_alignParentStart="true"
                    android:layout_below="@+id/questionCalm"
                    android:layout_marginTop="23dp"
                    android:max="10"
                    android:padding="20dp"
                    android:progress="5" />

                <TextView
                    android:id="@+id/questionCalm"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="@string/question_calm" />

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="30dp"
                    android:layout_below="@+id/questionCalm"
                    android:gravity="fill_horizontal">

                    <TextView
                        android:layout_width="80dp"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="10dp"
                        android:layout_marginRight="220dp"
                        android:layout_marginStart="10dp"
                        android:layout_marginEnd="220dp"
                        android:text="@string/label_not_calm" />

                    <TextView
                        android:layout_width="90dp"
                        android:layout_height="wrap_content"
                        android:text="@string/label_calm" />

                </LinearLayout>


            </RelativeLayout>

        </LinearLayout>

</ScrollView>

我希望在我这样做之后，一些相关的布局会出现

谢谢

Answer 1

如果您想以编程方式设置 layout_below，请参阅这篇文章

关于您的情况：layout_below在 LinearLayout 下无法作为父级工作。

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <RelativeLayout
            android:id="@+id/mentally"
            ... >
        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/physically"
            android:layout_below="@+id/mentally"
            ... >

只需按您想要的顺序删除layout_below并订购它。如果你想改变顺序，那么看看： change order of views in linear layout android