我要评论MainActivity.kt
package com.example.framelayout
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Handler
import android.os.Message
import android.widget.TextView
import java.lang.ref.WeakReference
import java.util.*
class MainActivity : AppCompatActivity() {
internal val names = intArrayOf(R.id.view01, R.id.view02, R.id.view03, R.id.view04, R.id.view05, R.id.view06)
private var views = arrayOfNulls<TextView>(names.size)
class MyHandler(private val activity : WeakReference<MainActivity>) : Handler(){
private var currentColor = 0;
internal val colors = intArrayOf(R.color.color1, R.color.color2, R.color.color3, R.color.color4, R.color.color5, R.color.color6)
override fun handleMessage(msg: Message) {
if (msg.what == 0x123) {
for (i in activity.get()?.names?.indices!!) {
activity.get()?.views!![i]?.setBackgroundResource(
colors[(i + currentColor) % colors.size]
)
}
currentColor++
}
super.handleMessage(msg)
}
}
private var handler : Handler = MyHandler(WeakReference(this));
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
for (i in names.indices) {
views[i] = findViewById(names[i])
}
Timer().schedule(object : TimerTask(){
override fun run() {
handler.sendEmptyMessage(0x123)
}
},0, 200)
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- 依次定义6个TextView，先定义的TextView位于底层，
后定义的TextView位于上层 -->
<TextView
android:id="@+id/view01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:width="160pt"
android:height="160pt"
android:background="#f00"/>
<TextView
android:id="@+id/view02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:width="140pt"
android:height="140pt"
android:background="#0f0"/>
<TextView
android:id="@+id/view03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:width="120pt"
android:height="120pt"
android:background="#00f"/>
<TextView
android:id="@+id/view04"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:width="100pt"
android:height="100pt"
android:background="#ff0"/>
<TextView
android:id="@+id/view05"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:width="80pt"
android:height="80pt"
android:background="#f0f"/>
<TextView
android:id="@+id/view06"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:width="60pt"
android:height="60pt"
android:background="#0ff"/>
</FrameLayout>
colors.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
<color name="color1">#f00</color>
<color name="color2">#0f0</color>
<color name="color3">#00f</color>
<color name="color4">#ff0</color>
<color name="color5">#f0f</color>
<color name="color6">#0ff</color>
</resources>
效果图
本文地址：https://blog.csdn.net/augfun/article/details/107881839
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