android 倾斜view 手动转动动画 随手势左右转动

本文介绍了一个基于Android的View旋转动画实现方法,通过监听触摸事件,实现了以控件中心为旋转中心的动态旋转效果。文章详细解析了代码逻辑,包括如何记录和更新旋转角度,以及在不同触摸事件中调整旋转状态。

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activity:

package com.manss.myapplication

import android.annotation.SuppressLint
import android.os.Bundle
import android.view.MotionEvent
import android.view.View
import android.view.View.OnTouchListener
import android.widget.RelativeLayout
import androidx.appcompat.app.AppCompatActivity

/**
 * View转动activity
 */
class RotateActivity : AppCompatActivity(), OnTouchListener {
    private var mRoot: RelativeLayout? = null
    private var mCircle: RelativeLayout? = null
    var i = 0
    var viewRotation = 0f
    var fingerRotation = 0.0
    var newFingerRotation = 0.0
    private var mImage: View? = null
    @SuppressLint("ClickableViewAccessibility")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_rotate_image)
        mRoot = findViewById(R.id.root)
        mCircle = findViewById(R.id.circle)
        mImage = findViewById(R.id.rotate_image_image)
        mRoot?.setOnTouchListener(this)
        val mIndex = intArrayOf(0)

    }

    override fun onTouch(v: View, event: MotionEvent): Boolean {
        val x = event.x
        val y = event.y
        //以控件中心为旋转中心
        val xc = mRoot!!.width / 2.toFloat()
        val yc = mRoot!!.height / 2.toFloat()
        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                viewRotation = mCircle!!.rotation //记录当前点击时的角度
                fingerRotation = Math.toDegrees(
                    Math.atan2(
                        x - xc.toDouble(),
                        yc - y.toDouble()
                    )
                )
            }
            MotionEvent.ACTION_MOVE -> {
                newFingerRotation = Math.toDegrees(
                    Math.atan2(
                        x - xc.toDouble(),
                        yc - y.toDouble()
                    )
                )
                mCircle!!.rotation = (viewRotation + newFingerRotation - fingerRotation).toFloat()
            }
            MotionEvent.ACTION_UP -> {
                newFingerRotation = 0.0
                fingerRotation = newFingerRotation
            }
        }
        return true
    }
}
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <RelativeLayout
        android:layout_width="match_parent"
        android:id="@+id/root"
        android:layout_height="match_parent">

        <RelativeLayout
            android:layout_width="300dp"
            android:layout_centerInParent="true"
            android:id="@+id/circle"
            android:rotationX="25"
            android:layout_height="300dp">

            <ImageView
                android:id="@+id/rotate_image_image"
                android:layout_width="300dp"
                android:layout_height="300dp"
                android:layout_centerInParent="true"
                android:src="@mipmap/circle0"/>

            <TextView
                android:layout_width="wrap_content"
                android:text="@string/app_name"
                android:layout_centerInParent="true"
                android:textColor="@android:color/black"
                android:layout_height="wrap_content"/>

        </RelativeLayout>

    </RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

 

activity_rotate_image.xml文件

android:rotationX="25"

表示绕X轴旋转25度,达到倾斜效果

 

适用于任何视图的可自定义反弹动画库。Getting StartedIn your build.gradledependencies {     implementation 'hari.bounceview:bounceview:0.1.0'}UsageAdd animations to any views like so:Button button = view.findViewById(R.id.button);BounceView.addAnimTo(button);Use BounceView with dialogs:CustomDialog customDialog = new CustomDialog(getActivity());//Add animation to custom dialogBounceView.addAnimTo(customDialog);        //Call before showing the dialogcustomDialog.show();PopupWindow popupWindow;...//Add animation to popup windowBounceView.addAnimTo(popupWindow);        //Call before showing the popuppopupWindow.showAtLocation(parentView, Gravity.CENTER, 0, 0);AlertDialog dialog = builder.create();//Add animation to alert dialogBounceView.addAnimTo(dialog);        //Call before showing the dialogdialog.show();Some cool animations://Bounce animationBounceView.addAnimTo(button1)         .setScaleForPopOutAnim(1.1f, 1.1f);//Horizontal flip animationBounceView.addAnimTo(button2)         .setScaleForPopOutAnim(1f, 0f);//Vertical flip animationBounceView.addAnimTo(button3)         .setScaleForPopOutAnim(0f, 1f);//Flicker animationBounceView.addAnimTo(button4)         .setScaleForPopOutAnim(0f, 0f);Customize BounceView properties:Button button = view.findViewById(R.id.button);BounceView.addAnimTo(button)        //Default push in scalex: 0.9f , scaley: 0.9f         .setScaleForPushInAnim(BounceView.PUSH_IN_SCALE_X, BounceView.PUSH_IN_SCALE_Y)        //Default pop out scalex: 1.1f, scaley: 1.1f         .setScaleForPopOutAnim(BounceView.POP_OUT_SCALE_X, BounceView.POP_OUT_SCALE_Y)        //Default push in anim duration: 100 (in milliseconds)         .setPushInAnimDuration(BounceView.PUSH_IN_ANIM_DURATION)        //Default pop out anim duration: 100 (in milliseconds)         .setPopOutAnimDuration(BounceView.POP_OUT_ANIM_DURATION)        //Default interpolator: AccelerateDecelerateInterpolator()         .setInterpolatorPushIn(BounceView.DEFAULT_INTERPOLATOR)         .setInterpolatorPopOut(BounceView.DEFAULT_INTERPOLATOR);
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