自定义组合控件

使用到的知识点：自定义属性+接口回调+视图动态加载

attrs.xml

<?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="leftBackground" format="reference|color"/>

        <attr name="rightText" format="string"/>
        <attr name="rightTextColor" format="color"/>
        <attr name="rightBackground" format="reference|color"/>
    </declare-styleable>
</resources>

TopBar.java

package com.app.viewdef;

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

/** * 自定义属性 */
public class TopBar extends RelativeLayout {

    String titleText;
    String leftText;
    String rightText;

    int titleTextColor;
    int leftTextColor;
    int rightTextColor;

    float titleTextSize;

    Button mLeftButton;
    Button mRightButton;
    TextView mTitleView;

    LayoutParams mLeftParams;
    LayoutParams mRightParams;
    LayoutParams mTitleParams;

    private OnTopBarClickListener mClickListener;

    public TopBar(Context context, AttributeSet attrs) {
        super(context, attrs);

        loadAttribute(context, attrs);
        initWidget(context);

        mLeftButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mClickListener.leftClick();
            }
        });

        mRightButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mClickListener.rightClick();
            }
        });
    }

    private void loadAttribute(Context context, AttributeSet attrs) {
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.TopBar);

        titleText = typedArray.getString(R.styleable.TopBar_titleText);
        leftText = typedArray.getString(R.styleable.TopBar_leftText);
        rightText = typedArray.getString(R.styleable.TopBar_rightText);

        titleTextColor = typedArray.getColor(R.styleable.TopBar_titleColor, 0);
        leftTextColor = typedArray.getColor(R.styleable.TopBar_leftTextColor, 0);
        rightTextColor = typedArray.getColor(R.styleable.TopBar_rightTextColor, 0);

        titleTextSize = typedArray.getDimension(R.styleable.TopBar_titleSize, 10);

        typedArray.recycle();
    }

    private void initWidget(Context context) {
        mLeftButton = new Button(context);
        mRightButton = new Button(context);
        mTitleView = new TextView(context);

        mLeftButton.setText(leftText);
        mLeftButton.setTextColor(leftTextColor);

        mRightButton.setText(rightText);
        mRightButton.setTextColor(rightTextColor);

        mTitleView.setText(titleText);
        mTitleView.setTextColor(titleTextColor);
        mTitleView.setTextSize(titleTextSize);
        mTitleView.setGravity(Gravity.CENTER);

        mLeftParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
        mLeftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT,TRUE);
        addView(mLeftButton, mLeftParams);

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

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

    public void setOnTopBarClickListener(OnTopBarClickListener mClickListener){
        this.mClickListener = mClickListener;
    }

    public interface OnTopBarClickListener{
        void leftClick();
        void rightClick();
    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<com.app.viewgroupdef.TopBar  xmlns:android="http://schemas.android.com/apk/res/android" xmlns:custom="http://schemas.android.com/apk/res-auto" android:id="@+id/top_bar" android:layout_width="match_parent" android:layout_height="40dp" custom:leftText="返回" custom:leftTextColor="#00ff00" custom:rightText="确定" custom:rightTextColor="#00ff00" custom:titleText="设置" custom:titleColor="#000000" custom:titleSize="10sp">

</com.app.viewgroupdef.TopBar>

MainActivity.java

package com.app.viewdef;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {

    private TopBar topBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        topBar = (TopBar) findViewById(R.id.top_bar);
        topBar.setOnTopBarClickListener(new TopBar.OnTopBarClickListener() {
            @Override
            public void leftClick() {
                onBackPressed();
            }

            @Override
            public void rightClick() {
                Toast.makeText(MainActivity.this,"触发确定按钮",Toast.LENGTH_SHORT).show();
            }
        });
    }
}

效果图：