Android自定义控件扩展示例

通过扩展布局的方式，创建一个图片和文字在一起的button

Android代码如下：

package com.example.demo.practice.ui;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.ViewGroup;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import com.example.demo.practice.R;public class ImageIcon extends LinearLayout {    public ImageIcon(Context context, AttributeSet attrs) {        super(context, attrs);        setOrientation(VERTICAL);        setGravity(Gravity.CENTER_HORIZONTAL);        //获取属性        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ImageIcon);        String title = typedArray.getString(R.styleable.ImageIcon_title_text);        int text_color = typedArray.getInt(R.styleable.ImageIcon_text_color, 0);        float text_size = typedArray.getDimension(R.styleable.ImageIcon_title_size, 0);        Drawable icon = typedArray.getDrawable(R.styleable.ImageIcon_icon_pic);        int icon_size = typedArray.getDimensionPixelSize(R.styleable.ImageIcon_icon_size,0);        //实例化控件        ImageView imageView = new ImageView(context);        TextView textView = new TextView(context);        imageView.setImageDrawable(icon);        textView.setText(title);        textView.setTextColor(text_color);        textView.setTextSize(text_size);        //添加控件，设置大小        addView(imageView);        addView(textView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));        ViewGroup.LayoutParams layoutParams = imageView.getLayoutParams();        layoutParams.width=icon_size;        layoutParams.height=icon_size;        typedArray.recycle();    }}

自定义属性：

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="ImageIcon">        <attr name="icon_pic" format="reference|color"/>        <attr name="title_text" format="string"/>        <attr name="title_size" format="dimension"/>        <attr name="icon_size" format="dimension"/>        <attr name="text_color" format="color"/>    </declare-styleable></resources>

使用：

<com.example.demo.practice.ui.ImageIcon        android:layout_width="wrap_content"        android:layout_height="wrap_content"        app:icon_pic="@drawable/icon_fault"        app:title_text="@string/login"        app:icon_size="60dp"        app:title_size="5sp"        app:text_color="@color/black">    </com.example.demo.practice.ui.ImageIcon>

结果图：