Android幀式布局怎么實(shí)現(xiàn)自動(dòng)切換顏色

本篇內(nèi)容介紹了“Android幀式布局怎么實(shí)現(xiàn)自動(dòng)切換顏色”的有關(guān)知識(shí)，在實(shí)際案例的操作過程中，不少人都會(huì)遇到這樣的困境，接下來就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧！希望大家仔細(xì)閱讀，能夠?qū)W有所成！

效果：

實(shí)現(xiàn):

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/tvBottom"
            android:layout_width="300dp"
            android:layout_height="300dp"
            android:layout_gravity="center"
            android:background="#ff0000"
            android:text="@string/bottom"
            android:textColor="#ffff00"
            android:textSize="30sp" />

        <TextView
            android:id="@+id/tvMiddle"
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:layout_gravity="center"
            android:background="#0000ff"
            android:text="@string/middle"
            android:textColor="#ffff00"
            android:textSize="30sp" />

        <TextView
            android:id="@+id/tvTop"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_gravity="center"
            android:background="#00ff00"
            android:text="@string/top"
            android:textColor="#ffff00"
            android:textSize="30sp" />


    </FrameLayout>

    <LinearLayout
        android:layout_marginTop="20dp"
        android:layout_width="300dp"
        android:layout_height="50dp"
        android:gravity="center">
        <Button
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="@string/start"
            android:textSize="20sp"
            android:onClick="doStart"
            android:layout_marginRight="50dp"
            android:background="#04b102"/>

        <Button
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="@string/stop"
            android:textSize="20sp"
            android:onClick="doStop"
            android:background="#04b102"/>
    </LinearLayout>
</LinearLayout>

ActivityMain.java

import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private TextView tvBottom;
    private TextView tvMiddle;
    private TextView tvTop;
    private int[] colors;
    private Handler handler;
    private Thread thread;
    private boolean isRunning;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //利用布局資源設(shè)置用戶界面
        setContentView(R.layout.activity_main);
        //通過資源標(biāo)識(shí)符獲取控件實(shí)例
        tvBottom = findViewById(R.id.tvBottom);
        tvMiddle = findViewById(R.id.tvMiddle);
        tvTop = findViewById(R.id.tvTop);
        //初始化顏色數(shù)組
        colors = new int[]{Color.RED, Color.BLUE, Color.GREEN};

        handler = new Handler() {
            @Override
            public void handleMessage(@NonNull Message msg) {
                super.handleMessage(msg);
                if (msg.what == 0x0001) {
                    //切換顏色
                    int temp = colors[0];
                    for (int i = 0; i < colors.length - 1; i++) {
                        colors[i] = colors[i + 1];
                    }
                    colors[colors.length - 1] = temp;
                    // 根據(jù)切換后的顏色數(shù)組來設(shè)置三層標(biāo)簽的背景色
                    tvBottom.setBackgroundColor(colors[0]);
                    tvMiddle.setBackgroundColor(colors[1]);
                    tvTop.setBackgroundColor(colors[2]);
                }
            }
        };

    }

    /**
     * 【開始】按鈕單擊事件處理方法
     */
    public void doStart(View view) {
        // 設(shè)置線程運(yùn)行控制變量
        isRunning = true;
        // 創(chuàng)建子線程，定時(shí)發(fā)送消息
        thread = new Thread(new Runnable() {
            @Override
            public void run() {
                while (isRunning) {
                    // 向主線程發(fā)送消息
                    handler.sendEmptyMessage(0x0001);
                    // 讓線程睡眠500毫秒
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        });
        // 啟動(dòng)線程
        thread.start();
    }

    /**
     * 【停止】按鈕單擊事件處理方法
     */
    public void doStop(View view) {
        // 設(shè)置線程運(yùn)行控制變量
        isRunning = false;
        // 銷毀子線程
        thread = null;
    }
}

string.xml

<resources>
    <string name="app_name">幀式布局：顏色切換</string>
    <string name="bottom">底層</string>
    <string name="middle">中層</string>
    <string name="top">頂層</string>
    <string name="start">開始</string>
    <string name="stop">結(jié)束</string>
</resources>

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