package com.loaderman.customviewdemo;

import android.animation.ObjectAnimator;

import android.animation.PropertyValuesHolder;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private Button mButton;

    private TextView mTv, mTv2;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mTv = (TextView)findViewById(R.id.tv);

        findViewById(R.id.start_anim).setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                PropertyValuesHolder rotationHolder = PropertyValuesHolder.ofFloat("Rotation", 60f, -60f, 40f, -40f, -20f, 20f, 10f, -10f, 0f);

                PropertyValuesHolder alphaHolder = PropertyValuesHolder.ofFloat("alpha", 0.1f, 1f, 0.1f, 1f);

                ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(mTv, rotationHolder, alphaHolder);\\实例入口

                animator.setDuration(3000);

                animator.start();

            }

        });

    }

}

package com.loaderman.customviewdemo;

import android.animation.ObjectAnimator;

import android.animation.PropertyValuesHolder;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.view.animation.AccelerateInterpolator;

public class MainActivity extends AppCompatActivity {

    private MyTextView mTv;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mTv = findViewById(R.id.mTv);

        findViewById(R.id.start_anim).setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                /**

                 * ofObject使用

                 */

                PropertyValuesHolder charHolder = PropertyValuesHolder.ofObject("CharText",new CharEvaluator(),new Character('A'),new Character('Z'));

                ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(mTv, charHolder);

                animator.setDuration(3000);

                animator.setInterpolator(new AccelerateInterpolator());

                animator.start();

            }

        });

    }

}

package com.loaderman.customviewdemo;

import android.content.Context;

import android.util.AttributeSet;

public class MyTextView extends android.support.v7.widget.AppCompatTextView {

    public MyTextView(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    public void setCharText(Character character){

        setText(String.valueOf(character));

    }

}

package com.loaderman.customviewdemo;

import android.animation.TypeEvaluator;

public class CharEvaluator implements TypeEvaluator<Character> {

    public Character evaluate(float fraction, Character startValue, Character endValue) {

        int startInt  = (int)startValue;

        int endInt = (int)endValue;

        int curInt = (int)(startInt + fraction *(endInt - startInt));

        char result = (char)curInt;

        return result;

    }

}