（四十七）属性动画Demo

1、程序结构

2、MainActivity.java程序

package com.example.objectanimator1;

import java.util.ArrayList;
import java.util.List;

import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.BounceInterpolator;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

    private int[] ivId = { R.id.iv_a, R.id.iv_b, R.id.iv_c, R.id.iv_d,
            R.id.iv_e, R.id.iv_f, R.id.iv_g, R.id.iv_h };

    private List<ImageView> imageInfos = new ArrayList<ImageView>();

    private Boolean flag = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        for (int i = 0; i < ivId.length; i++) {
            ImageView iv = (ImageView) findViewById(ivId[i]);
            imageInfos.add(iv);
            iv.setOnClickListener(this);
        }
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.iv_a:
            if (flag) {
                startAnima();
                flag = false;
            } else {
                closeAnima();
                flag = true;
            }

            break;

        default:
            Toast.makeText(MainActivity.this, "clicked:"+ v.getId() , 0).show();
            break;
        }
    }

    private void startAnima() {
        // TODO Auto-generated method stub
        for (int i = 0; i < ivId.length; i++) {
            ObjectAnimator oa = ObjectAnimator.ofFloat(imageInfos.get(i),
                    "translationY", 0, i * 100);
            oa.setInterpolator(new BounceInterpolator());
            oa.setDuration(1000);
            oa.setStartDelay(300);
            oa.start();
        }
    }

    private void closeAnima() {
        // TODO Auto-generated method stub
        for (int i = 0; i < ivId.length; i++) {
            ObjectAnimator oa = ObjectAnimator.ofFloat(imageInfos.get(i),
                    "translationY", i * 100, 0);
            oa.setInterpolator(new AccelerateInterpolator());
            oa.setDuration(1000);
            oa.setStartDelay(300);
            oa.start();
        }
    }
}

2、activity_main.xml的代码

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.objectanimator1.MainActivity" >

    <ImageView
        android:id="@+id/iv_a"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:src="@drawable/a" />

    <ImageView
        android:id="@+id/iv_b"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/b" />

    <ImageView
        android:id="@+id/iv_c"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/c" />

    <ImageView
        android:id="@+id/iv_d"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/d" />

    <ImageView
        android:id="@+id/iv_e"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/e" />

    <ImageView
        android:id="@+id/iv_f"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/f" />

    <ImageView
        android:id="@+id/iv_g"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/g" />

    <ImageView
        android:id="@+id/iv_h"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/h" />

</FrameLayout>