在Android中,使用QuickJS引擎实现动画效果需要结合JavaScript和Android原生代码。以下是一个简单的示例,展示了如何使用QuickJS实现一个动画效果:
build.gradle
文件中添加以下依赖:dependencies {
implementation 'com.github.yangfuhai:QuickJS:v1.5.0'
}
MainActivity.java
文件中,初始化QuickJS引擎:import com.eclipsesource.v8.V8;
import com.eclipsesource.v8.V8Array;
import com.eclipsesource.v8.V8Object;
import com.eclipsesource.v8.V8Script;
public class MainActivity extends AppCompatActivity {
private V8Runtime v8Runtime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化QuickJS引擎
V8 runtime = V8.createV8Runtime(getApplicationContext());
v8Runtime = runtime;
}
}
animation.js
,用于实现动画效果:function animate(elementId, targetX, targetY, duration) {
var element = document.getElementById(elementId);
var startX = element.offsetLeft;
var startY = element.offsetTop;
var startTime = Date.now();
function step(timestamp) {
var progress = timestamp - startTime;
if (progress < duration) {
element.style.left = (startX + (targetX - startX) * progress / duration) + 'px';
element.style.top = (startY + (targetY - startY) * progress / duration) + 'px';
requestAnimationFrame(step);
} else {
element.style.left = targetX + 'px';
element.style.top = targetY + 'px';
}
}
requestAnimationFrame(step);
}
MainActivity.java
文件中,调用JavaScript代码实现动画效果:import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private V8Runtime v8Runtime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化QuickJS引擎
V8 runtime = V8.createV8Runtime(getApplicationContext());
v8Runtime = runtime;
// 加载JavaScript文件
v8Runtime.executeScript("require('./animation.js')");
// 创建一个TextView,用于显示动画效果
TextView textView = findViewById(R.id.textView);
// 调用JavaScript函数实现动画效果
v8Runtime.executeScript("animate('textView', 200, 200, 1000);", textView);
}
}
activity_main.xml
文件中,添加一个TextView用于显示动画效果:<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</LinearLayout>
运行应用,你会看到TextView从左上角移动到右下角,实现了动画效果。