java - TextView 和 ImageView 卡出 LinearLayout
问题描述
我正在构建一个带有 TextView、ScrollView 和 LinearLayout 的 android 应用程序,我想使用 Java 向此 LinearLayout 添加一个 TextView 和一个 ImageView,但它们都位于布局之外。
这是我的活动 XML:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/galaxy"
tools:context=".Planet">
<TextView
android:id="@+id/planets"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/purple"
android:text="@string/planets"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="36sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.05" />
<ScrollView
android:id="@+id/scroll"
android:layout_width="409dp"
android:layout_height="646dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0">
<LinearLayout
android:id="@+id/linear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical" />
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
这是我用来生成和添加 TextView 和 ImageView 的代码:
public class MainActivity extends AppCompatActivity {
private ArrayList<Planet> planets = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Planet mercury = Planet.getPlanetFromResources(0, getResources());
planets.add(mercury);
addPlanetToUI(mercury);
}
public void addPlanetToUI(final Planet planet){
int color = getResources().getColor(R.color.yellow);
LinearLayout linear = findViewById(R.id.linear);
linear.setOrientation(LinearLayout.VERTICAL);
linear.setWeightSum(20f);
LinearLayout.LayoutParams lp = new
LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
LinearLayout.LayoutParams lp1 = new
LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
LinearLayout.LayoutParams lp2 = new
LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
LinearLayout horizontal = new LinearLayout(this);
horizontal.setWeightSum(6f);
horizontal.setOrientation(LinearLayout.HORIZONTAL);
lp.weight = 10f;
horizontal.setLayoutParams(lp);
ImageView iv = new ImageView(this);
lp1.weight = .75f;
iv.setImageDrawable(getDrawable(planet.getImgSmallResourceValues()));
iv.setLayoutParams(lp1);
TextView tv = new TextView(this);
lp2.weight= .5f;
tv.setText(planet.getName());
tv.setBackgroundColor(color);
tv.setTextSize(40);
tv.setLayoutParams(lp2);
horizontal.addView(iv);
horizontal.addView(tv);
linear.addView(horizontal);
}
}
这是结果:
解决方案
So is not that your elements are outside of the layout. The problem is that your ScrollView has a top constraint to the top of parent.
Change your ScrollView top constraint (app:layout_constraintTop_toTopOf="parent") to:
app:layout_constraintTop_toBottomOf="@id/planets"
Since your layout container is a ConstraintLayout elements can overlap between them.
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