PropertyValuesHolder学习

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();
            }
        });
    }
}

PropertyValuesHolder的ofFloat和ofInt函数的基本用法

---

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;
    }
}

PropertyValuesHolder的ofobject函数的基本用法

效果: