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[英]Insert a TextView under an others in a RelativeLayout in a ScrollView
[英]RelativeLayout insert a view between two others
假设我在RelativeLayout
有两个按钮。 顶部的标有“一个”的按钮和下方的标有“ 3”的按钮。 布局是这样定义的。
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:id="@+id/mainContainer"
tools:context=".MainActivity" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tvOne"
android:layout_centerHorizontal="true"
android:layout_alignParentTop="true"
android:text="One" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tvThree"
android:layout_centerHorizontal="true"
android:layout_below="@id/tvOne"
android:text="Three" />
</RelativeLayout>
因此,我在MainActivity
的onCreate
中编写了一些代码来动态创建一个Button
,并将其插入到一到三个之间。 但这不起作用。 有什么我想念的吗? 我将此问题创建为我遇到的一个较大问题的简化版本,因此我无法清除布局并仅动态插入一二和三。
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button one = (Button)findViewById(R.id.tvOne);
Button three = (Button)findViewById(R.id.tvThree);
//Dynamically create a button, set it underneath one and above two.
Button two = new Button(this);
two.setText("TWO TWO TWO TWO TWO TWO TWO");
//Create some layout params so that this button is horizontally centered,
//above button number three and below button number one
final int WC = RelativeLayout.LayoutParams.WRAP_CONTENT;
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(WC, WC);
params.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
params.addRule(RelativeLayout.BELOW, one.getId());
params.addRule(RelativeLayout.ABOVE, three.getId());
two.setLayoutParams(params);
//Add button number two to the activity.
RelativeLayout rl = (RelativeLayout)findViewById(R.id.mainContainer);
rl.addView(two);
}
工作代码,我已经检查过了。
public class Main extends Activity {
Context ctx;
RelativeLayout rlayMainContainer;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ctx = this;
rlayMainContainer = (RelativeLayout) findViewById(R.id.mainContainer);
Button one = (Button) findViewById(R.id.tvOne);
Button three = (Button) findViewById(R.id.tvThree);
// adding button two dynamically
Button two = new Button(ctx);
two.setText("hello");
two.setId(12);
RelativeLayout.LayoutParams lpSecond = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lpSecond.addRule(RelativeLayout.CENTER_HORIZONTAL);
lpSecond.addRule(RelativeLayout.BELOW, one.getId());
rlayMainContainer.addView(two, lpSecond);
//align button three below button two
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) three
.getLayoutParams();
params.addRule(RelativeLayout.BELOW, two.getId());
three.setLayoutParams(params);
}
}
实际上,“ two”按钮在那里,但因为高度= 0而看不到。这些代码行使“ two”按钮的高度= 0
params.addRule(RelativeLayout.BELOW, one.getId());
params.addRule(RelativeLayout.ABOVE, three.getId());
是的,“两个”按钮layoutParams表示它必须在“一个”和“三个”之间,但是这些按钮之间没有空格->没有高度。
为了解决这个问题,您需要删除设置“ two”在“ three”之上的行,并添加代码以指示“ three”现在在“ two”之下。
final int WC = RelativeLayout.LayoutParams.WRAP_CONTENT;
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
WC, WC);
params.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
params.addRule(RelativeLayout.BELOW, one.getId());
two.setLayoutParams(params);
// Add button number two to the activity.
RelativeLayout rl = (RelativeLayout) findViewById(R.id.mainContainer);
rl.addView(two);
two.setId(1);
params = (LayoutParams) three.getLayoutParams();
params.addRule(RelativeLayout.BELOW, two.getId());
three.setLayoutParams(params);
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