杂篇二

• 杂篇一
• 杂篇二

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1、事件分发机制
2、Activity启动流程

1、事件分发机制

参考资料：
https://blog.csdn.net/ClAndEllen/article/details/79365369
https://www.jianshu.com/p/555ffeb64e68

<com.lak.app.test.java.view.JScrollView >
    <com.lak.app.test.java.view.JLinearLayout>
        <com.lak.app.test.java.view.JTextView
            android:clickable="true" />
    </com.lak.app.test.java.view.JLinearLayout>
</com.lak.app.test.java.view.JScrollView>

// activity
class TestJavaActivity : AppCompatActivity() {

    override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("activity ---------- dispatchTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.dispatchTouchEvent(ev)
        HiLog.d("activity ---------- dispatchTouchEvent ----- ${eventActionToString(ev)} ----- $result")
        return result
    }

    override fun onTouchEvent(event: MotionEvent?): Boolean {
        HiLog.d("activity ---------- dispatchTouchEvent ----- ${eventActionToString(event)}")
        val result = super.onTouchEvent(event)
        HiLog.d("activity ---------- dispatchTouchEvent ----- ${eventActionToString(event)} ----- $result")
        return result
    }
}

class JScrollView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : ScrollView(context, attrs, defStyleAttr) {

    override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("scrollview ---------- dispatchTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.dispatchTouchEvent(ev)
        HiLog.d("scrollview ---------- dispatchTouchEvent ----- ${eventActionToString(ev)} ----- $result")
        return result
    }

    override fun onInterceptTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("scrollview ---------- onInterceptTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.onInterceptTouchEvent(ev)
        HiLog.d("scrollview ---------- onInterceptTouchEvent ----- ${eventActionToString(ev)} ----- $result")
        return result
    }

    override fun onTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("scrollview ---------- onTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.onTouchEvent(ev)
        HiLog.d("scrollview ---------- onTouchEvent ----- ${eventActionToString(ev)} ----- $result")
        return result
    }

}

class JLinearLayout @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : LinearLayout(context, attrs, defStyleAttr) {

    override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("linearlayout ---------- dispatchTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.dispatchTouchEvent(ev)
        HiLog.d("linearlayout ---------- dispatchTouchEvent ----- ${eventActionToString(ev)} ----- $result")
        return result
    }

    override fun onInterceptTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("linearlayout ---------- onInterceptTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.onInterceptTouchEvent(ev)
        HiLog.d("linearlayout ---------- onInterceptTouchEvent ----- ${eventActionToString(ev)} ----- $result")
        return result

//        HiLog.d("linearlayout ---------- onInterceptTouchEvent ----- ${eventActionToString(ev)}")
//        val result = true
//        HiLog.d("linearlayout ---------- onInterceptTouchEvent ----- ${eventActionToString(ev)} ----- $result")
//        return result

    }

    override fun onTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("linearlayout ---------- onTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.onTouchEvent(ev)
        HiLog.d("linearlayout ---------- onTouchEvent ----- ${eventActionToString(ev)} ----- $result")
        return result
    }

}

class JTextView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : AppCompatTextView(context, attrs, defStyleAttr) {

    override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("textview ---------- dispatchTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.dispatchTouchEvent(ev)
        HiLog.d("textview ---------- dispatchTouchEvent ----- ${eventActionToString(ev)} ----- $result")
        return result
    }

    override fun onTouchEvent(ev: MotionEvent?): Boolean {
        HiLog.d("textview ---------- onTouchEvent ----- ${eventActionToString(ev)}")
        val result = super.onTouchEvent(ev)
        HiLog.d("textview ---------- onTouchEvent ----- ${eventActionToString(ev)} ----- $result")

//        HiLog.d("textview ---------- onTouchEvent ----- ${eventActionToString(ev)}")
//        val result = false
//        HiLog.d("textview ---------- onTouchEvent ----- ${eventActionToString(ev)} ----- $result")

        return result
    }

}

// 运行结果： 以 down 事件为例
activity ---------- dispatchTouchEvent ----- down
scrollview ---------- dispatchTouchEvent ----- down
scrollview ---------- onInterceptTouchEvent ----- down
scrollview ---------- onInterceptTouchEvent ----- down ----- false
linearlayout ---------- dispatchTouchEvent ----- down
linearlayout ---------- onInterceptTouchEvent ----- down
linearlayout ---------- onInterceptTouchEvent ----- down ----- false
textview ---------- dispatchTouchEvent ----- down
textview ---------- onTouchEvent ----- down
textview ---------- onTouchEvent ----- down ----- true
textview ---------- dispatchTouchEvent ----- down ----- true
linearlayout ---------- dispatchTouchEvent ----- down ----- true
scrollview ---------- dispatchTouchEvent ----- down ----- true
activity ---------- dispatchTouchEvent ----- down ----- true

事件分发流程

2、Activity启动流程

深入理解Activity启动流程和AMS框架（一）
深入理解Activity启动流程和AMS框架（二）
深入理解Activity启动流程和AMS框架 - 完整