Android自定义可复用View——topbar

来源：互联网发布：java支付平台开发demo 编辑：程序博客网时间：2024/06/12 21:55

1.自定义属性，创建attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="Topbar">        <attr name="barBackground" format="reference|color" />        <attr name="titleText" format="string" />        <attr name="titleTextSize" format="dimension" />        <attr name="titleTextColor" 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>

2.自定义Layout，Topbar.java

package com.example.mytopbar;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.view.ViewGroup;import android.widget.Button;import android.widget.ListAdapter;import android.widget.RelativeLayout;import android.widget.TextView;/** * Created by Zac on 2016/10/7. */public class Topbar extends RelativeLayout {    private TextView titleTv;    private Button leftBtn;    private Button rightBtn;    private Drawable barBackground;    private String titleText;    private float titleTextSize;    private int titleTextColor;    private String leftText;    private int leftTextColor;    private Drawable leftBackground;    private String rightText;    private int rightTextColor;    private Drawable rightBackground;    private LayoutParams titleParams, leftParams, rightParams;    private topBarClickListener listener;    public interface topBarClickListener {        public void leftBtnClick();        public void rightBtnClick();    }    public void setOnTopbarClickListener(topBarClickListener listener) {        this.listener = listener;    }    public Topbar(Context context, AttributeSet attrs) {        super(context, attrs);        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.Topbar);        barBackground = ta.getDrawable(R.styleable.Topbar_barBackground);        titleText = ta.getString(R.styleable.Topbar_titleText);        titleTextSize = ta.getDimension(R.styleable.Topbar_titleTextSize, 0);        titleTextColor = ta.getColor(R.styleable.Topbar_titleTextColor, 0);        leftText = ta.getString(R.styleable.Topbar_leftText);        leftTextColor = ta.getColor(R.styleable.Topbar_leftTextColor, 0);        leftBackground = ta.getDrawable(R.styleable.Topbar_leftBackground);        rightText = ta.getString(R.styleable.Topbar_rightText);        rightTextColor = ta.getColor(R.styleable.Topbar_rightTextColor, 0);        rightBackground = ta.getDrawable(R.styleable.Topbar_rightBackground);        ta.recycle();        titleTv = new TextView(context);        leftBtn = new Button(context);        rightBtn = new Button(context);        titleTv.setText(titleText);        titleTv.setTextSize(titleTextSize);        titleTv.setTextColor(titleTextColor);        titleTv.setGravity(Gravity.CENTER);        leftBtn.setText(leftText);        leftBtn.setTextColor(leftTextColor);        leftBtn.setBackground(leftBackground);        rightBtn.setText(rightText);        rightBtn.setTextColor(rightTextColor);        rightBtn.setBackground(rightBackground);        setBackground(barBackground);        titleParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT);        titleParams.addRule(RelativeLayout.CENTER_IN_PARENT, TRUE);        leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);        leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, TRUE);        rightParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);        rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, TRUE);        addView(titleTv, titleParams);        addView(leftBtn, leftParams);        addView(rightBtn, rightParams);        leftBtn.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                listener.leftBtnClick();            }        });        rightBtn.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                listener.rightBtnClick();            }        });    }    public void setLeftBtnVisible(boolean flag) {        if (flag) {            leftBtn.setVisibility(View.VISIBLE);        } else {            leftBtn.setVisibility(View.GONE);        }    }    public void setRightBtnVisible(boolean flag) {        if (flag) {            rightBtn.setVisibility(View.VISIBLE);        } else {            rightBtn.setVisibility(View.GONE);        }    }}

3.布局文件中设置属性

<?xml version="1.0" encoding="utf-8"?><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:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="5dp"    tools:context="com.example.mytopbar.MainActivity">    <com.example.mytopbar.Topbar        android:id="@+id/topbar"        android:layout_width="match_parent"        android:layout_height="40dp"        custom:barBackground="#333333"        custom:titleText="自定义标题"        custom:titleTextSize="10sp"        custom:titleTextColor="#123412"        custom:leftText="Back"        custom:leftTextColor="#FFFFFF"        custom:leftBackground="#333333"        custom:rightText="More"        custom:rightTextColor="#FFFFFF"        custom:rightBackground="#333333">    </com.example.mytopbar.Topbar>    </RelativeLayout>

4.引用topbar

package com.example.mytopbar;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Topbar topbar = (Topbar) findViewById(R.id.topbar);        topbar.setOnTopbarClickListener(new Topbar.topBarClickListener() {            @Override            public void leftBtnClick() {                Toast.makeText(MainActivity.this, "HelloLeft", Toast.LENGTH_SHORT).show();            }            @Override            public void rightBtnClick() {                Toast.makeText(MainActivity.this, "HelloRight", Toast.LENGTH_SHORT).show();            }        });    }}

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