（7）onLayout()
该方法在当前View需要为其子View分配尺寸和位置时会被调用。
（8）onDraw(Canvas)
该方法用于View渲染内容的细节。
（9）onWindowFocusChanged()
该方法也可能在绘制过程中被调用，具体是在包含当前View的Window获得或失去焦点时被调用。此时可以设置代码中定义的View的一些LayoutParameter。
如果View进入了销毁阶段，肯定是会被调用的。
（10）onDetachedFromWindow()
当View离开附着的窗口时触发，比如在Activity调用onDestroy方法时View就会离开窗口。和一开始的AttachedToWindow相对，都只会被调用一次。
代码如下：
package com.example.testviewlifecycle;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
public class CustomView extends View {
private static final String TAG = "CustomView=-->";
private Paint mPaint;
public CustomView(Context context) {
super(context);
Log.d(TAG, "view Constructors 1");
}
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
Log.d(TAG, "view Constructors 2");
}
public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
Log.d(TAG, "view Constructors 3");
}
private void init() {
mPaint = new Paint();
mPaint.setColor(Color.RED);
mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
mPaint.setTextAlign(Paint.Align.CENTER);
mPaint.setAntiAlias(true);
mPaint.setTextSize(36);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
Log.d(TAG, "onFinishInflate");
}
@Override
protected void onVisibilityChanged(View changedView, int visibility) {
super.onVisibilityChanged(changedView, visibility);
Log.d(TAG, "onVisibilityChanged");
}
@Override
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
Log.d(TAG, "onFocusChanged");
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
Log.d(TAG, "onAttachedToWindow");
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
Log.d(TAG, "onDetachedFromWindow");
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
Log.d(TAG, "onMeasure");
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
Log.d(TAG, "onLayout");
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Log.d(TAG, "onDraw");
canvas.drawText("view生命周期", 100, 400, mPaint);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
Log.d(TAG, "onSizeChanged");
}
@Override
public void onWindowFocusChanged(boolean hasWindowFocus) {
super.onWindowFocusChanged(hasWindowFocus);
Log.d(TAG, "onWindowFocusChanged");
}
@Override
protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
Log.d(TAG, "onWindowVisibilityChanged");
}
}
这里默认的customView是visible的，和Activity的生命周期结果如下
1）、android:visibility=“visible”
创建过程
2020-03-10 14:38:06.542 7961-7961/com.example.testviewlifecycle D/MainActivity=-->: onCreate 1
2020-03-10 14:38:06.564 7961-7961/com.example.testviewlifecycle D/CustomView=-->: view Constructors 2
2020-03-10 14:38:06.564 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onFinishInflate
2020-03-10 14:38:06.566 7961-7961/com.example.testviewlifecycle D/MainActivity=-->: onCreate 2
2020-03-10 14:38:06.569 7961-7961/com.example.testviewlifecycle D/MainActivity=-->: onStart
2020-03-10 14:38:06.572 7961-7961/com.example.testviewlifecycle D/MainActivity=-->: onResume
2020-03-10 14:38:06.589 7961-7961/com.example.testviewlifecycle D/MainActivity=-->: onAttachedToWindow
2020-03-10 14:38:06.590 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onAttachedToWindow
2020-03-10 14:38:06.590 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onWindowVisibilityChanged
2020-03-10 14:38:06.590 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onVisibilityChanged
2020-03-10 14:38:06.593 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onMeasure
2020-03-10 14:38:06.594 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onMeasure
2020-03-10 14:38:06.606 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onMeasure
2020-03-10 14:38:06.606 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onMeasure
2020-03-10 14:38:06.606 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onSizeChanged
2020-03-10 14:38:06.606 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onLayout
2020-03-10 14:38:06.608 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onDraw
2020-03-10 14:38:06.621 7961-7961/com.example.testviewlifecycle D/CustomView=-->: onWindowFocusChanged
销毁过程
2020-03-10 14:41:24.684 9188-9188/com.example.testviewlifecycle D/MainActivity=-->: onPause
2020-03-10 14:41:24.694 9188-9188/com.example.testviewlifecycle D/CustomView=-->: onWindowFocusChanged
2020-03-10 14:41:25.237 9188-9188/com.example.testviewlifecycle D/CustomView=-->: onWindowVisibilityChanged
2020-03-10 14:41:25.252 9188-9188/com.example.testviewlifecycle D/MainActivity=-->: onStop
2020-03-10 14:41:25.255 9188-9188/com.example.testviewlifecycle D/CustomView=-->: onVisibilityChanged
2020-03-10 14:41:25.258 9188-9188/com.example.testviewlifecycle D/MainActivity=-->: onDestroy
2020-03-10 14:41:25.259 9188-9188/com.example.testviewlifecycle D/CustomView=-->: onDetachedFromWindow
2020-03-10 14:41:25.260 9188-9188/com.example.testviewlifecycle D/MainActivity=-->: onDetachedFromWindow
2）、**android:visibility=“invisible”**不可见时
创建
2020-03-10 14:42:54.333 9649-9649/? D/MainActivity=-->: onCreate 1
2020-03-10 14:42:54.404 9649-9649/? D/CustomView=-->: view Constructors 2
2020-03-10 14:42:54.404 9649-9649/? D/CustomView=-->: onFinishInflate
2020-03-10 14:42:54.413 9649-9649/? D/MainActivity=-->: onCreate 2
2020-03-10 14:42:54.417 9649-9649/? D/MainActivity=-->: onStart
2020-03-10 14:42:54.422 9649-9649/? D/MainActivity=-->: onResume
2020-03-10 14:42:54.480 9649-9649/? D/MainActivity=-->: onAttachedToWindow
2020-03-10 14:42:54.480 9649-9649/? D/CustomView=-->: onAttachedToWindow
2020-03-10 14:42:54.480 9649-9649/? D/CustomView=-->: onWindowVisibilityChanged
2020-03-10 14:42:54.480 9649-9649/? D/CustomView=-->: onVisibilityChanged
2020-03-10 14:42:54.488 9649-9649/? D/CustomView=-->: onMeasure
2020-03-10 14:42:54.489 9649-9649/? D/CustomView=-->: onMeasure
2020-03-10 14:42:54.511 9649-9649/? D/CustomView=-->: onMeasure
2020-03-10 14:42:54.511 9649-9649/? D/CustomView=-->: onMeasure
2020-03-10 14:42:54.511 9649-9649/? D/CustomView=-->: onSizeChanged
2020-03-10 14:42:54.511 9649-9649/? D/CustomView=-->: onLayout
2020-03-10 14:42:54.638 9649-9649/? D/CustomView=-->: onWindowFocusChanged
销毁
最后
简历首选内推方式，速度快，效率高啊！然后可以在拉钩，boss，脉脉，大街上看看。简历上写道熟悉什么技术就一定要去熟悉它，不然被问到不会很尴尬！做过什么项目，即使项目体量不大，但也一定要熟悉实现原理！不是你负责的部分，也可以看看同事是怎么实现的，换你来做你会怎么做？做过什么，会什么是广度问题，取决于项目内容。但做过什么，达到怎样一个境界，这是深度问题，和个人学习能力和解决问题的态度有关了。大公司看深度，小公司看广度。大公司面试你会的，小公司面试他们用到的你会不会，也就是岗位匹配度。
选定你想去的几家公司后，先去一些小的公司练练，学习下面试技巧，总结下，也算是熟悉下面试氛围，平时和同事或者产品PK时可以讲得头头是道，思路清晰至极，到了现场真的不一样，怎么描述你所做的一切，这绝对是个学术性问题！
面试过程一定要有礼貌！即使你觉得面试官不尊重你，经常打断你的讲解，或者你觉得他不如你，问的问题缺乏专业水平，你也一定要尊重他，谁叫现在是他选择你，等你拿到offer后就是你选择他了。
金九银十面试季，跳槽季，整理面试题已经成了我多年的习惯！在这里我和身边一些朋友特意整理了一份快速进阶为Android高级工程师的系统且全面的学习资料。涵盖了Android初级——Android高级架构师进阶必备的一些学习技能。
附上：我们之前因为秋招收集的二十套一二线互联网公司Android面试真题（含BAT、小米、华为、美团、滴滴）和我自己整理Android复习笔记（包含Android基础知识点、Android扩展知识点、Android源码解析、设计模式汇总、Gradle知识点、常见算法题汇总。）
本文在开源项目：【GitHub 】中已收录，里面包含不同方向的自学编程路线、面试题集合/面经、及系列技术文章等，资源持续更新中…
