android自定义View之复合控件

<?xml version="1.0" encoding="utf-8"?> <resources>
    <declare-styleable name="TopBar">
        <attr name="titleText" format="string"/>
        <attr name="titleSize" format="dimension"/>
        <attr name="titleTextColor2" format="color"/>
        <attr name="leftTextColor" format="color"/>
        <attr name="leftBackground" format="reference|color"/>
       <!--按钮的背景可以指定为具体颜色，也可以一张图片，所以使用“|”来分隔不同的属性-->
        <attr name="leftText" format="string"/>
        <attr name="rightTextColor" format="color"/>
        <attr name="rightBackground" format="reference|color"/>
        <attr name="rightText" format="string"/>
</declare-styleable> </resources>

package com.wjc.customwidget_0502;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;


/**
 * Created by admin on 2016/5/2.
 */
public class CompositControlDemo01 extends RelativeLayout {

    //定义与attrs.xml中的自定义属性对应的属性
    private int mLeftTextColor;
    private String mLeftText;
    private Drawable mLeftBackground;
    private int mRightTextColor;
    private String mRightText;
    private Drawable mRightBackgound;
    private String mTitle;
    private float mTitleTextSize;
    private int mTitleTextColor;
    //布局参数
    private LayoutParams mLeftParame;
    private LayoutParams mRightParame;
    private LayoutParams mTitleParame;
    //定义显示的布局
    private Button mLeftButton;
    private Button mRightButton;
    private TextView mTitleView;
    //定义一个公共接口
    private topbarClickListener mListener;


    //构造函数，attrs就是布局文件传过来的对应的属性
    public CompositControlDemo01(Context context, AttributeSet attrs) {
        super(context, attrs);
        initAttrs(context, attrs);
        initView(context);
    }

    //将attrs.xml中定义的属性值存入typedArray中
    public void initAttrs(Context context, AttributeSet attrs) {
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TopBar);
        mLeftTextColor = ta.getColor(R.styleable.TopBar_leftTextColor, 0);
        mLeftText = ta.getString(R.styleable.TopBar_leftText);
        mLeftBackground = ta.getDrawable(R.styleable.TopBar_leftBackground);

        mRightTextColor = ta.getColor(R.styleable.TopBar_rightTextColor, 0);
        mRightText = ta.getString(R.styleable.TopBar_rightText);
        mRightBackgound = ta.getDrawable(R.styleable.TopBar_rightBackground);

        mTitle = ta.getString(R.styleable.TopBar_titleText);
        mTitleTextSize = ta.getDimension(R.styleable.TopBar_titleSize, 10);
        mTitleTextColor = ta.getColor(R.styleable.TopBar_titleTextColor2, 0);
        ta.recycle();//避免重新创建时的错误
    }

    //组合控件，并将属性分配给他们,并设置监听事件
    public void initView(Context context) {
        mLeftButton = new Button(context);
        mRightButton = new Button(context);
        mTitleView = new TextView(context);

        mLeftButton.setTextColor(mLeftTextColor);
        mLeftButton.setText(mLeftText);
        mLeftButton.setBackground(mLeftBackground);

        mRightButton.setTextColor(mRightTextColor);
        mRightButton.setText(mRightText);
        mRightButton.setBackground(mRightBackgound);

        mTitleView.setTextColor(mTitleTextColor);
        mTitleView.setText(mTitle);
        mTitleView.setTextSize(mTitleTextSize);
        mTitleView.setGravity(Gravity.CENTER);

        //为元素设定相应的布局参数
        mLeftParame = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
        mLeftParame.addRule(RelativeLayout.ALIGN_PARENT_LEFT, TRUE);
        addView(mLeftButton, mLeftParame);

        mRightParame = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
        mRightParame.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, TRUE);
        addView(mRightButton, mRightParame);

        mTitleParame = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
        mTitleParame.addRule(RelativeLayout.CENTER_IN_PARENT, TRUE);
        addView(mTitleView, mTitleParame);


        //按钮的点击事件，不需要具体的实现
        //只需调用者接口的方法，回调的时候，会有具体的实现
        mLeftButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mListener.leftClick();
            }
        });
        mRightButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mListener.rightClick();
            }
        });
    }

    //定义接口
    //接口对象，实现回调机制，在回调方法中，通过映射的接口对象调用接口的方法
    //而不用去考虑如何实现，具体的实现由调用者去创建
    public interface topbarClickListener {
        void leftClick();
        void rightClick();
    }

    //暴露一个方法给调用者来注册接口回调
    //通过接口来获取回调者对接口方法的实现
    public void setOnTopbarClickListener(topbarClickListener mListener) {
        this.mListener = mListener;
    }

    /**
     * 设置按钮的显示与否通过id区分按钮，flag区分是否显示
     *
     * @param id   id
     * @param flag is Visable？
     */
    public void setButtonVisable(int id, boolean flag) {
        if (flag) {
            if (id == 0) {
                mLeftButton.setVisibility(View.VISIBLE);
            } else {
                mRightButton.setVisibility(View.VISIBLE);
            }
        } else {
            if (id == 0) {
                mLeftButton.setVisibility(View.GONE);
            } else {
                mRightButton.setVisibility(View.GONE);
            }
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
   <com.wjc.customwidget_0502.CompositControlDemo01
       xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:custom="http://schemas.android.com/apk/res-auto"
       android:id="@ id/topBar"
       android:layout_width="wrap_content"
       android:layout_height="50dp"
       android:padding="5dp"
      android:background="#3F7EA4"

       custom:leftBackground="@drawable/chevron_left"
       custom:leftTextColor="#ff00"
       custom:leftText="返回"

        custom:rightText="更多"
        custom:rightTextColor="#ff00"
        custom:rightBackground="#ffccff"

        custom:titleText="自定义标题"
        custom:titleTextColor2="#555555"
        custom:titleSize="10sp"
       >
</com.wjc.customwidget_0502.CompositControlDemo01>

xmlns:android=http://schemas.android.com/apk/res/android

xmlns:custom=http://schemas.android.com/apk/res-auto

<include layout="@layout/topbar"/>

package com.wjc.customwidget_0502;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    CompositControlDemo01 mTopbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTopbar=(CompositControlDemo01)findViewById(R.id.topBar);//初始化组合控件
        //为topBar中的按钮注册监听事件 
        mTopbar.setOnTopbarClickListener(new CompositControlDemo01.topbarClickListener() {
            @Override
            public void leftClick() {
                Toast.makeText(MainActivity.this, "back", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void rightClick() {
                Toast.makeText(MainActivity.this,"more",Toast.LENGTH_LONG).show();
            }
        });
        /*  //是否显示相应的按钮
        mTopbar.setButtonVisable(0,true);//只显示左边按钮*/
    }


}