自定义view:topBar

1.values文件夹下新建attrs.xml文件：自定义如下相关属性元素

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="topBar">        <attr name="titleText" format="string"/>        <attr name="titleSize" format="dimension"/>        <attr name="titleColor" format="color"/>        <attr name="leftText" format="string"/>        <attr name="leftTextColor" format="color"/>        <attr name="leftTextBackground" format="reference|color"/>        <attr name="rightText" format="string"/>        <attr name="rightTextColor" format="color"/>        <attr name="rightTextBackground" format="reference|color"/>    </declare-styleable></resources>

2.自定义TopBar

package com.example.topbar;import android.content.Context;import android.content.res.TypedArray;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.Gravity;import android.widget.Button;import android.widget.RelativeLayout;import android.widget.TextView;public class TopBar extends RelativeLayout {    private Button leftBtn,rightBtn;    private String titleText;    private int titleColor;    private float titleSize;    private String leftText;    private Drawable leftBackGround;    private int leftTextColor;    private String rightText;    private Drawable rightBackGround;    private int rightTextColor;    private LayoutParams leftParams,rightParams,titleParams;    public TopBar(Context context, AttributeSet attrs) {        super(context, attrs);        TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.topBar);        titleText = array.getString(R.styleable.topBar_titleText);        titleColor = array.getColor(R.styleable.topBar_titleColor,0);        titleSize = array.getDimension(R.styleable.topBar_titleSize,0);        leftText = array.getString(R.styleable.topBar_leftText);        leftBackGround = array.getDrawable(R.styleable.topBar_leftTextBackground);        leftTextColor = array.getColor(R.styleable.topBar_leftTextColor,0);        rightText = array.getString(R.styleable.topBar_rightText);        rightBackGround = array.getDrawable(R.styleable.topBar_rightTextBackground);        rightTextColor = array.getColor(R.styleable.topBar_rightTextColor, 0);        array.recycle();        leftBtn = new Button(context);        leftBtn.setText(leftText);        leftBtn.setTextColor(rightTextColor);        leftBtn.setBackgroundDrawable(leftBackGround);        leftParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);        leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);        addView(leftBtn,leftParams);        rightBtn = new Button(context);        rightBtn.setText(rightText);        rightBtn.setTextColor(rightTextColor);        rightBtn.setBackgroundDrawable(rightBackGround);        rightParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);        rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);        addView(rightBtn,rightParams);        TextView titleView = new TextView(context);        titleView.setText(titleText);        titleView.setTextColor(titleColor);        titleView.setTextSize(titleSize);        titleView.setGravity(Gravity.CENTER);        titleParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);        titleParams.addRule(RelativeLayout.CENTER_IN_PARENT);        addView(titleView,titleParams);    }}

3.应用自定义的view

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:my="http://schemas.android.com/apk/res-auto"    android:id="@+id/container"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <com.example.topbar.TopBar        android:layout_height="wrap_content"        android:layout_width="wrap_content"        my:titleText="你好"        my:titleSize="15sp"        my:titleColor="#ffffd0bf"        my:leftTextColor="#ff4290ff"        my:leftTextBackground="#ff5fff1b"        my:leftText="左按钮"        my:rightTextColor="#ff1f1bff"        my:rightTextBackground="#ffff1a57"        my:rightText="右按钮"/></LinearLayout>

4.效果图