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android quickjs如何实现动画效果

小樊
85
2024-12-07 22:52:01
栏目: 编程语言

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:

  1. 首先,在Android项目中集成QuickJS。在build.gradle文件中添加以下依赖:
dependencies {
    implementation 'com.github.yangfuhai:QuickJS:v1.5.0'
}
  1. 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;
    }
}
  1. 创建一个JavaScript文件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);
}
  1. 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);
    }
}
  1. 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。

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