在android上添加一个ListView下的button

所以我一直试图添加一个button在Android下的ListView下,问题是该button不会出现。

<?xml version="1.0" encoding="utf-8"?> <AbsoluteLayout android:id="@+id/widget0" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"> <ListView android:id="@+id/messagelist" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_x="0px" android:layout_y="0px"> </ListView> <Button android:id="@+id/addbutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button" android:layout_x="0px" android:layout_y="379px"> </Button> </AbsoluteLayout> 

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AbsoluteLayout已被弃用。 我会build议,而不是你使用LinearLayout:

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout android:id="@+id/widget0" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"> <ListView android:id="@+id/messagelist" android:layout_width="wrap_content" android:layout_height="0dp" android:layout_weight="1"> </ListView> <Button android:id="@+id/addbutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button"> </Button> </LinearLayout> 

我还build议阅读开发人员的文档 ,以获得一个很好的介绍。

在“API演示”示例中有一个这样的布局的例子。 以下页面链接到示例:

http://developer.android.com/resources/samples/index.html

查找文件LinearLayout9.java,以及相应的布局文件linear_layout9.xml。 为了方便,我把它们粘贴在这里:

LinearLayout9.java:

 /* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.android.apis.view; import com.example.android.apis.R; import android.app.Activity; import android.os.Bundle; import android.widget.ListView; import android.widget.ArrayAdapter; /** * Demonstrates how the layout_weight attribute can shrink an element too big * to fit on screen. */ public class LinearLayout9 extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.linear_layout_9); ListView list = (ListView) findViewById(R.id.list); list.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, AutoComplete1.COUNTRIES)); } } 

linear_layout9.xml:

 <?xml version="1.0" encoding="utf-8"?> <!-- Copyright (C) 2007 The Android Open Source Project Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <!-- Demonstrates a simple linear layout. The layout fills the screen, with the children stacked from the top. --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1.0" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/linear_layout_9_button" /> </LinearLayout>