package com.example.ddddddd;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;

public class MyButton extends Button{

    public MyButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    //窗口加载这个组件时会执行
    protected void onFinishInflate() {
        super.onFinishInflate();
        Log.d("test", "我被XML加载了");
    }
    
    //看不懂，不知道什么意思，解释如下
    //用来检测View组件和他包含的所有子组件的大小
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
    
    //当该组件需要分配其子组件位置、大小时会调用该方法
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
    }
    
    //该组件大小被改变时会调用该方法
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        Log.d("test", "被改变大小了，原来w="+oldw+"y="+oldh+" 现在w="+w+"y="+h);
        super.onSizeChanged(w, h, oldw, oldh);
    }
    
    //要绘制该组件内容时回调该方法
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }
    
    //光标在这个组件上，并且按键被按下时调用该方法
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        Log.d("test", "按键"+keyCode+"按下了");
        return super.onKeyDown(keyCode, event);
    }
    
    //光标在这个组件上，并且按键松开时调用该方法
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        Log.d("test", "按键"+keyCode+"松开了");
        return super.onKeyUp(keyCode, event);
    }

    //发生轨迹球事件,不知道是个什么东西
    public boolean onTrackballEvent(MotionEvent event) {
        return super.onTrackballEvent(event);
    }
    
    //发生触摸屏事件，触发此方法
    public boolean onTouchEvent(MotionEvent event) {
        Log.d("test", "我被触摸了,位置 X:"+event.getX()+" Y:"+event.getY());
        return super.onTouchEvent(event);
    }
    
    //当得到或失去焦点，触发
    protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
        if(gainFocus){
            Log.d("test", "得到焦点");
        }else{
            Log.d("test", "失去焦点");
        }
        super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
    }
    
    //该组件放入某个窗口时，触发
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
    }
    
    //组件从窗口上分离，触发
    protected void onDetachedFromWindow() {
        Log.d("test", "分离");
        super.onDetachedFromWindow();
    }
    
    //可见性发生改变时触发，一般调用setVisibility(View.GONE)
    protected void onVisibilityChanged(View changedView, int visibility) {
        Log.d("test", "摧毁");
        super.onVisibilityChanged(changedView, visibility);
    }

}

public class MyView extends View{

    public MyView(Context context) {
        super(context);
    }
    
    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    
    //定义一个画笔
    private Paint paint=new Paint();
    private float cx=0;
    private float cy=0;
    
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //设置画笔颜色,这里制定红色
        paint.setColor(Color.RED);
        //绘制一个位置在cx,cy的半径15,的圆
        canvas.drawCircle(cx, cy, 15, paint);
    }

    public boolean onTouchEvent(MotionEvent event) {
        cx=event.getX();
        cy=event.getY();
        //重绘
        invalidate();
        return true;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:background="#ffcb05" >

    <Button
        android:id="@+id/button_left"
        android:layout_width="60dp"
        android:layout_height="40dp"
        android:layout_centerVertical="true"
        android:layout_marginLeft="5dp"
        android:background="@drawable/back_button"
        android:textColor="#fff" />

    <TextView
        android:id="@+id/title_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="标题"
        android:textColor="#fff"
        android:textSize="20sp" />

</RelativeLayout>

public class TitleView extends FrameLayout {

    //左边返回的按钮
    private Button leftButton;
    //中间的标题文字
    private TextView titleText;

    //初始化
    public TitleView(Context context, AttributeSet attrs) {
        super(context, attrs);
        //获取XML配置文件
        LayoutInflater.from(context).inflate(R.layout.title, this);
        //获取标题文字组件
        titleText = (TextView) findViewById(R.id.title_text);
        //获取返回按钮组件
        leftButton = (Button) findViewById(R.id.button_left);
        //点击事件
        leftButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                ((Activity) getContext()).finish();
            }
        });
    }

    public void setTitleText(String text) {
        titleText.setText(text);
    }
    public void setLeftButtonText(String text) {
        leftButton.setText(text);
    }
    public void setLeftButtonListener(OnClickListener l) {
        leftButton.setOnClickListener(l);
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.example.ddddddd.TitleView
        android:id="@+id/title_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </com.example.ddddddd.TitleView>

</RelativeLayout>