标签:
按钮由文本或图标(或文本和一个图标)组成,当用户触摸到它时,会发生一些动作。今天我们开始Button的学习。
根据你是否想要一个带有文本的按钮,一个图标,或者两者,你可以在三种方式中创建按钮来进行布局:
<Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button_text" ... />
<ImageButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/button_icon" ... />
Button
class with the android:drawableLeft
attribute:<Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button_text" android:drawableLeft="@drawable/button_icon" ... />
1) 在xml中定义的Button中增加属性android:onClick
<?xml version="1.0" encoding="utf-8"?> <Button xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button_send" android:onClick="sendMessage" />
public void sendMessage(View view) { // Do something in response to button click }
2) 在代码中使用OnClickListener
Button button = (Button) findViewById(R.id.button_send); button.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // Do something in response to button click } });
1) Borderless button : To create a borderless button, apply the borderlessButtonStyle style to the button.
<Button android:onClick="sendMessage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="bordless button" style="?android:attr/borderlessButtonStyle" />
2) Custom background: Instead of supplying a simple bitmap or color, however, your background should be a state list resource that changes appearance depending on the button‘s current state
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/button_pressed" android:state_pressed="true" /> <item android:drawable="@drawable/button_focused" android:state_focused="true" /> <item android:drawable="@drawable/button_default" /> </selector>
<Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="send button" android:background="@drawable/button_custom" />
项目结构:
MainActivity.java:
package com.huhx.linux.buttontest; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button) findViewById(R.id.sendButton); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this, "button click", Toast.LENGTH_SHORT).show(); } }); } // bordless button public void sendMessage(View view) { Toast.makeText(MainActivity.this, "Borderless Button", Toast.LENGTH_SHORT).show(); } }
button_custom.xml
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/button_pressed" android:state_pressed="true" /> <item android:drawable="@drawable/button_focused" android:state_focused="true" /> <item android:drawable="@drawable/button_default" /> </selector>
activity_main.xml.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:orientation="vertical" tools:context="com.huhx.linux.buttontest.MainActivity"> <Button android:id="@+id/sendButton" android:text="text button" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <ImageButton android:src="@mipmap/ic_launcher" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:drawableRight="@mipmap/ic_launcher" android:text="Linux" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:onClick="sendMessage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="bordless button" style="?android:attr/borderlessButtonStyle" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="send button" android:background="@drawable/button_custom" /> </LinearLayout>
运行效果如下:
标签:
原文地址:http://www.cnblogs.com/huhx/p/base_button.html