java - Android textField 填充父级的剩余高度

Question

我对 Android 很陌生，我正在尝试做一些非常基本的事情..我想要一个包含 2 个文本字段的布局

• 第一个高度应为 100 dp
• 第二个应该填充布局的剩余高度

这就是我现在所做的:

// LinearLayout
LinearLayout linearLayout = new LinearLayout(this);
linearLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));

// TextView1
final TextView textView1 = new TextView(this);
textView1.setText(R.string.app_name);
textView1.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
textView1.setBackgroundColor(ContextCompat.getColor(this, R.color.red));
LinearLayout.LayoutParams lyp1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 100);
linearLayout.addView(textView1, lyp1);

// TextView2
final TextView textView2 = new TextView (this);
textView2.setText(R.string.app_name);
textView2.setBackgroundColor(ContextCompat.getColor(this, R.color.blue));
LinearLayout.LayoutParams lyp2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, 1.0f);
linearLayout.addView(textView2, lyp2);

但我不知道如何说第二个应该正好在第一个之后直到布局的底部。

我应该做什么？

谢谢

Answer 1

不要对此类任务使用相对布局。它比 LinearLayout 慢，并且可以使用 LinearLayout 轻松完成。使用layoutWeight，如下例所示:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="match_parent"
 android:layout_height="match_parent">
 <TextView 
 android:layout_height="100dp" android:layout_width="match_parent"
 />
 <TextView 
 android:layout_height="0dp" android:layout_width="match_parent"
 android:layout_weight="1" />
</LinearLayout>

要从代码中设置layout_weight，请执行以下操作:

    public static int dpToPx(int dp)
{
    return (int) (dp * Resources.getSystem().getDisplayMetrics().density);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
 // LinearLayout
    LinearLayout linearLayout = new LinearLayout(this);
    linearLayout.setOrientation(LinearLayout.VERTICAL);
    linearLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));

    // TextView1
    final TextView textView1 = new TextView(this);
    textView1.setText(R.string.app_name);

    textView1.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
    textView1.setBackgroundColor(Color.RED);
    LinearLayout.LayoutParams lyp1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, dpToPx(100));
    linearLayout.addView(textView1, lyp1);

    // TextView2
    final TextView textView2 = new TextView (this);
    textView2.setText(R.string.app_name);
    textView2.setBackgroundColor(Color.BLUE);
    LinearLayout.LayoutParams lyp2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, 1.0f);
    linearLayout.addView(textView2, lyp2);

    setContentView(linearLayout);
}