Question

我对Android很新，我尝试做非常基本的事情。我想有一个包含2个textFields

的布局

第一个应该是100 dp高度
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是第一个之后的juste，直到布局的底部。

我该怎么办？

谢谢

Answer 1

不要使用相对布局来完成此类任务。它比LinearLayout慢，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);
}

Answer 2

首先，你应该为这个任务使用线性布局。但是如果你想把它放在RelativeLayout中，那么解决方案就在

之下

1 - 您应该将第二个textView的高度设置为match_parent

2-RelativeLayout.END_OF会将布局与textview1的右侧对齐。所以使用RelativeLayout.BOTTOM

3-RelativeLayout.LayoutParams（RelativeLayout.LayoutParams.MATCH_PARENT，100）;将你的textview的高度设置为100像素（像素大小因设备而异）。所以在dp中设置高度就像这样

DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
            float dp = displayMetrics.density; 
RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, (int)(100*dp));

尝试这个 -

//density of device
DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
        float dp = displayMetrics.density; 

// RelativeLayout
RelativeLayout relativeLayout = new RelativeLayout(this);
relativeLayout.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.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));
RelativeLayout.LayoutParams lyp1 = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, (int)(100*dp));
lyp1.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
relativeLayout.addView(textView1, lyp1);

// TextView2
final TextView textView2 = new TextView (this);
textView2.setBackgroundColor(ContextCompat.getColor(this, R.color.blue));
RelativeLayout.LayoutParams lyp2 = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
lyp2.addRule(RelativeLayout.BOTTOM, textView1.getId());
relativeLayout.addView(imageView1, lyp2);

mainLinearLayout.addView(relativeLayout);

Android textField填充父级的剩余高度

2 个答案: