Android属性动画property animation
16lz
2021-01-24
属性动画property animation
基于底部导航模板BottomNavigation的实现
https://blog.csdn.net/BLU_111/article/details/103257206
Step1
1.通过res—New—Vector Asset创建图片资源：ic_mood_black_24dp.xml
2.为First、Second、Third三个Fragment设置ImageView并选择所创建的图片资源。
设置属性：
Step2
FirstFragment
package com.example.bottomnavigationdemo;import androidx.lifecycle.ViewModelProviders;import android.animation.ObjectAnimator;import android.os.Bundle;import androidx.annotation.NonNull;import androidx.annotation.Nullable;import androidx.fragment.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;public class FirstFragment extends Fragment {private FirstViewModel mViewModel;private ImageView imageView;public static FirstFragment newInstance() { return new FirstFragment();}@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.first_fragment, container, false); imageView = view.findViewById(R.id.imageView); return view;}@Overridepublic void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mViewModel = ViewModelProviders.of(this).get(FirstViewModel.class); //这里of()里的参数表示ViewModel的生效范围。this表示在本fragment内生效，requireActivity()表示在Activity内生效。 //参数为this，切换fragment时ViewModel里的数据会丢失。而requireActivity()不会。 imageView.setRotation(mViewModel.rotationPosition); final ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(imageView, "rotation", 0, 0); objectAnimator.setDuration(500); imageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (!objectAnimator.isRunning()) { objectAnimator.setFloatValues(imageView.getRotation(), imageView.getRotation() + 100); mViewModel.rotationPosition += 100; objectAnimator.start(); } } }); }}FirstViewModel
package com.example.bottomnavigationdemo;import androidx.lifecycle.ViewModel;public class FirstViewModel extends ViewModel {// TODO: Implement the ViewModelfloat rotationPosition = 0;}SecondFragment
package com.example.bottomnavigationdemo;import androidx.lifecycle.ViewModelProviders;import android.animation.ObjectAnimator;import android.os.Bundle;import androidx.annotation.NonNull;import androidx.annotation.Nullable;import androidx.fragment.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;public class SecondFragment extends Fragment {private SecondViewModel mViewModel;private ImageView imageView;public static SecondFragment newInstance() { return new SecondFragment();}@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.second_fragment, container, false); imageView = view.findViewById(R.id.imageView); return view;}@Overridepublic void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mViewModel = ViewModelProviders.of(this).get(SecondViewModel.class); imageView.setScaleX(mViewModel.scaleFactor); imageView.setScaleY(mViewModel.scaleFactor); final ObjectAnimator objectAnimatorX = ObjectAnimator.ofFloat(imageView,"scaleX",0,0); final ObjectAnimator objectAnimatorY = ObjectAnimator.ofFloat(imageView,"scaleY",0,0); objectAnimatorX.setDuration(500); objectAnimatorY.setDuration(500); imageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (!objectAnimatorX.isRunning()){ objectAnimatorX.setFloatValues(imageView.getScaleX() + 0.1f); objectAnimatorY.setFloatValues(imageView.getScaleY() + 0.1f); mViewModel.scaleFactor += 0.1; objectAnimatorX.start(); objectAnimatorY.start(); } } }); }}SecondViewModel
package com.example.bottomnavigationdemo;import androidx.lifecycle.ViewModel;public class SecondViewModel extends ViewModel {float scaleFactor = 1;}ThirdFragment
package com.example.bottomnavigationdemo;import androidx.lifecycle.ViewModelProviders;import android.animation.ObjectAnimator;import android.os.Bundle;import androidx.annotation.NonNull;import androidx.annotation.Nullable;import androidx.fragment.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import java.util.Random;public class ThirdFragment extends Fragment {private ThirdViewModel mViewModel;private ImageView imageView;public static ThirdFragment newInstance() { return new ThirdFragment();}@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.third_fragment, container, false); imageView = view.findViewById(R.id.imageView); return view;}@Overridepublic void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mViewModel = ViewModelProviders.of(this).get(ThirdViewModel.class); imageView.setX(imageView.getX() + mViewModel.dX); final ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(imageView,"x",0,0); objectAnimator.setDuration(500); imageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (!objectAnimator.isRunning()){ float dx = new Random().nextBoolean() ?100:-100; objectAnimator.setFloatValues(imageView.getX(),imageView.getX() + dx); mViewModel.dX += dx; objectAnimator.start(); } } }); }}ThirdViewModel
package com.example.bottomnavigationdemo;import androidx.lifecycle.ViewModel;public class ThirdViewModel extends ViewModel { float dX;}运行截图：
点击图片可旋转：
点击图片可缩放：
点击图片可随机左右移动：
源码链接：https://pan.baidu.com/s/1HDujvAcAXIPse78fPl50xw
提取码：aovu
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