我试图以编程方式在约束布局内的循环中包含多个视图。我该怎么做?
我想要这样的东西:
我可以对单个视图执行此操作,但是我无法对循环内的多个视图执行相同的操作。基本上,我有一个滚动视图,并且在其中有两行,在行的顶部和底部,我想在这些行之间包含以编程方式创建的文本视图。我提供了以下代码行:
final TextView[] myTextViews = new TextView[3];
int i=1;
ConstraintSet constraintSet = new ConstraintSet();
myTextViews[i-1] = new TextView(this);
myTextViews[i-1].setId(R.id.testid);
myTextViews[i-1].setText("Text 1");
ConstraintLayout.LayoutParams test = new ConstraintLayout.LayoutParams(
ConstraintLayout.LayoutParams.MATCH_CONSTRAINT, ConstraintLayout.LayoutParams.WRAP_CONTENT);
myTextViews[i-1].setLayoutParams(test);
constraintLayout.addView(myTextViews[i-1]);
constraintSet.clone(constraintLayout);
constraintSet.connect(myTextViews[i-1].getId(), ConstraintSet.TOP, lineTop.getId(), ConstraintSet.BOTTOM, 28);
constraintSet.connect(myTextViews[i-1].getId(), ConstraintSet.LEFT, constraintLayout.getId(), ConstraintSet.LEFT, 70);
constraintSet.connect(myTextViews[i-1].getId(), ConstraintSet.RIGHT, constraintLayout.getId(), ConstraintSet.RIGHT, 70);
constraintSet.applyTo(constraintLayout);
for ( i = 1; i < 3; i++) {
myTextViews[i] = new TextView(this);
myTextViews[i].setId(R.id.testid+i);
myTextViews[i].setText("Hello World "+i);
myTextViews[i].setLayoutParams(test);
constraintLayout.addView(myTextViews[i]);
constraintSet.connect(myTextViews[i].getId(), ConstraintSet.TOP, myTextViews[i-1].getId(), ConstraintSet.BOTTOM, 28);
constraintSet.connect(myTextViews[i].getId(), ConstraintSet.LEFT, constraintLayout.getId(), ConstraintSet.LEFT, 76);
constraintSet.connect(myTextViews[i].getId(), ConstraintSet.RIGHT, constraintLayout.getId(), ConstraintSet.RIGHT, 76);
constraintSet.applyTo(constraintLayout);
}
constraintSet.connect(lineBottom.getId(), ConstraintSet.TOP, myTextViews[i-1].getId(), ConstraintSet.BOTTOM, 8);
constraintSet.applyTo(constraintLayout);
以下是xml代码:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:id="@+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.reddevil.practice.practiceActivity">
<ScrollView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="184dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="72dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<android.support.constraint.ConstraintLayout
android:id="@+id/scroll"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/text1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@drawable/textgps"
android:text="Random Text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="parent" />
<TextView
android:id="@+id/lineTop"
android:layout_width="0dp"
android:layout_height="0dp"
android:text=" "
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/dropoff" />
<TextView
android:id="@+id/forstops"
android:layout_width="0dp"
android:layout_height="0dp"
android:text=" "
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/lineTop" />
<TextView
android:id="@+id/text2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@drawable/textgps"
android:text="Random Text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
</ScrollView>
</android.support.constraint.ConstraintLayout>
答案 0 :(得分:0)
您可以做的是制作一个可重用的组件(根据您共享的图像,一个自定义的文本视图)。在主xml文件中,可以使用ScrollView内的ListView或RecyclerView来利用该可重用组件。
答案 1 :(得分:0)
对于这种用法,您应该使用RecyclerView或ListView。
如果要与之一起工作,则必须稍作更新
第一件事:不要使用约束布局(ID为scroll
的约束布局,应将其替换为属性为LinearLayout
的{{1}}
您将拥有一个看起来像这样的xml布局(我仅使用重要属性简化了它,但您也需要其他属性)
android:orientation="vertical"
然后,为您添加TextViews:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout >
<ScrollView
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:id="@+id/scroll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/textgps"
android:text="Random Text"/>
<View style="@style/Divider"/>
<LinearLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"/>
<View style="@style/Divider"/>
<TextView
android:id="@+id/text2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@drawable/textgps"
android:text="Random Text"/>
</LinearLayout>
</ScrollView>
</android.support.constraint.ConstraintLayout>
但是您的textView格式没有太多...
您可以为添加的每一行创建一个xml布局文件,以便可以轻松自定义它:
final TextView[] myTextViews = new TextView[3];
LinearLayout container = findViewById(R.id.container);
LinearLayout .LayoutParams test = new LinearLayout .LayoutParams(
LinearLayout.LayoutParams.MATCH_CONSTRAINT, LinearLayout.LayoutParams.WRAP_CONTENT);
for ( i = 1; i < 3; i++) {
myTextViews[i] = new TextView(this);
//i don't think you should do that
//myTextViews[i].setId(R.id.testid+i);
myTextViews[i].setText("Hello World "+i);
myTextViews[i].setLayoutParams(test);
container.addView(myTextViews[i]);
}
代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/text_row_text"
android:layout_width="0px"
android:layout_weight="1"
android:layout_height="wrap_content"
android:textSize="@dimen/text_size_data"
android:layout_marginLeft="15dp"
android:layout_marginStart="15dp"/>
<Button
android:id="@+id/text_row_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/colorError"
android:text="X"/>
</LinearLayout>
如果您没有太多可以显示的项目,可以这样做,但是不要尝试像这样列出数百个视图,这对于表演来说很糟糕