安卓自定义控件——标题栏的复用
一贯作风，先看效果图，再实现
编写自定义属性文件atts.xml，自定义属性中涉及到的属性有左右两边的button的背景图，中间标题的内容，字体大小，字体颜色。
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="TopBar">
<attr name="leftBackground" format="reference"/>
<attr name="rightBackground" format="reference"/>
<attr name="titleText" format="string"/>
<attr name="titleTextSize" format="dimension"/>
<attr name="titleTextColor" format="color|reference"/>
</declare-styleable>
</resources>
编写布局文件layout_topbar.xml，使用相对布局，左边一个button，跟父控件左对齐后外边距为5dp，右边的button也是一样，中间的标题居中显示
<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="wrap_content"
tools:context=".TopBar">
<Button
android:id="@+id/leftButton"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="5dp" />
<TextView
android:id="@+id/titleTextView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:gravity="center" />
<Button
android:id="@+id/rightButton"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="5dp" />
</RelativeLayout>
编写自定义控件，继承RelativeLayout，获取自定义属性并给对应的控件赋值
package cn.edu.zafu.view.topbar;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
/**
* Created by lizhangqu on 2015/1/18.
*/
public class TopBar extends RelativeLayout {
private Button leftButton, rightButton;
private TextView titleTextView;
private OnLeftAndRightClickListener listener;//监听点击事件
//设置监听器
public void setOnLeftAndRightClickListener(OnLeftAndRightClickListener listener) {
this.listener = listener;
}
//设置左边按钮的可见性
public void setLeftButtonVisibility(boolean flag){
if(flag)
leftButton.setVisibility(View.VISIBLE);
else
leftButton.setVisibility(View.GONE);
}
//设置右边按钮的可见性
public void setRightButtonVisibility(boolean flag){
if(flag)
rightButton.setVisibility(View.VISIBLE);
else
rightButton.setVisibility(View.GONE);
}
//按钮点击接口
public interface OnLeftAndRightClickListener {
public void onLeftButtonClick();
public void onRightButtonClick();
}
public TopBar(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(R.layout.layout_topbar, this);
leftButton = (Button) findViewById(R.id.leftButton);
rightButton = (Button) findViewById(R.id.rightButton);
titleTextView = (TextView) findViewById(R.id.titleTextView);
leftButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (listener != null)
listener.onLeftButtonClick();//点击回调
}
});
rightButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (listener != null)
listener.onRightButtonClick();//点击回调
}
});
//获得自定义属性并赋值
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.TopBar);
int leftBtnBackground = typedArray.getResourceId(R.styleable.TopBar_leftBackground, 0);
int rightBtnBackground = typedArray.getResourceId(R.styleable.TopBar_rightBackground, 0);
String titleText = typedArray.getString(R.styleable.TopBar_titleText);
float titleTextSize = typedArray.getDimension(R.styleable.TopBar_titleTextSize, 0);
int titleTextColor = typedArray.getColor(R.styleable.TopBar_titleTextColor, 0x38ad5a);
typedArray.recycle();//释放资源
leftButton.setBackgroundResource(leftBtnBackground);
rightButton.setBackgroundResource(rightBtnBackground);
titleTextView.setText(titleText);
titleTextView.setTextSize(titleTextSize);
titleTextView.setTextColor(titleTextColor);
}
}
调用自定义控件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<cn.edu.zafu.view.topbar.TopBar
android:id="@+id/topbar"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#38ad5a"
custom:leftBackground="@drawable/left_button_selector"
custom:rightBackground="@drawable/right_button_selector"
custom:titleText="标题内容"
custom:titleTextColor="#000"
custom:titleTextSize="6sp" />
</RelativeLayout>
package cn.edu.zafu.view.topbar;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TopBar topBar= (TopBar) findViewById(R.id.topbar);
topBar.setOnLeftAndRightClickListener(new TopBar.OnLeftAndRightClickListener() {
@Override
public void onLeftButtonClick() {
Toast.makeText(getApplicationContext(),"left",Toast.LENGTH_SHORT).show();
}
@Override
public void onRightButtonClick() {
Toast.makeText(getApplicationContext(),"right",Toast.LENGTH_SHORT).show();
}
});
topBar.setLeftButtonVisibility(false);
}
}
编写left_button_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/left_pressed" android:state_pressed="true"/>
<item android:drawable="@drawable/left_normal" />
</selector>
编写right_button_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/right_pressed" android:state_pressed="true"/>
<item android:drawable="@drawable/right_normal" />
</selector>
