镜头由远及近

package com.duguang.baseanimation.ui.splash;

import android.graphics.drawable.Drawable;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Animation.AnimationListener;
import android.widget.ImageView;
import android.widget.TextView;

import com.duguang.baseanimation.R;
import com.duguang.baseanimation.ui.base.BaseActivity;

public class LensFocusActivity extends BaseActivity{

private ImageView imageView_pic;
private TextView textView_desc ;

/**
* 三个切换的动画
*/
private Animation mFadeIn;
private Animation mFadeInScale;
private Animation mFadeOut;

/**
* 三个图片
*/
private Drawable mPicture_1;
private Drawable mPicture_2;
private Drawable mPicture_3;

@Override
public void setView() {
setContentView(R.layout.activity_splash_lens_focus);
}

@Override
public void initView() {
imageView_pic = (ImageView) findViewById(R.id.imageView_pic);
textView_desc = (TextView) findViewById(R.id.textView_desc);
init();
}

private void init() {
initAnim();
initPicture();
/**
* 界面刚开始显示的内容
*/
imageView_pic.setImageDrawable(mPicture_1);
textView_desc.setText("儿时的我们...");
imageView_pic.startAnimation(mFadeIn);
}

/**
* 初始化动画
*/
private void initAnim() {
mFadeIn = AnimationUtils.loadAnimation(this,R.anim.welcome_fade_in);
mFadeIn.setDuration(1000);
mFadeInScale = AnimationUtils.loadAnimation(this,R.anim.welcome_fade_in_scale);
mFadeInScale.setDuration(6000);
mFadeOut = AnimationUtils.loadAnimation(this,R.anim.welcome_fade_out);
mFadeOut.setDuration(1000);
}

/**
* 初始化图片
*/

private void initPicture() {
mPicture_1 = getResources().getDrawable(R.drawable.pic_01);
mPicture_2 = getResources().getDrawable(R.drawable.pic_02);
mPicture_3 = getResources().getDrawable(R.drawable.pic_03);
}

/**
* 监听事件
*/
public void setListener() {
/**
* 动画切换原理:开始时是用第一个渐现动画,当第一个动画结束时开始第二个放大动画,当第二个动画结束时调用第三个渐隐动画,
* 第三个动画结束时修改显示的内容并且重新调用第一个动画,从而达到循环效果
*/
mFadeIn.setAnimationListener(new AnimationListener() {

public void onAnimationStart(Animation animation) {

}

public void onAnimationRepeat(Animation animation) {

}

public void onAnimationEnd(Animation animation) {
imageView_pic.startAnimation(mFadeInScale);
}
});
mFadeInScale.setAnimationListener(new AnimationListener() {

public void onAnimationStart(Animation animation) {

}

public void onAnimationRepeat(Animation animation) {

}

public void onAnimationEnd(Animation animation) {
imageView_pic.startAnimation(mFadeOut);
}
});
mFadeOut.setAnimationListener(new AnimationListener() {

public void onAnimationStart(Animation animation) {

}

public void onAnimationRepeat(Animation animation) {

}

public void onAnimationEnd(Animation animation) {
/**
* 这里其实有些写的不好,还可以采用更多的方式来判断当前显示的是第几个,从而修改数据,
* 我这里只是简单的采用获取当前显示的图片来进行判断。
*/
if (imageView_pic.getDrawable().equals(mPicture_1)) {
textView_desc.setText("懵懂的我们...");
imageView_pic.setImageDrawable(mPicture_2);
} else if (imageView_pic.getDrawable().equals(mPicture_2)) {
textView_desc.setText("少年的我们...");
imageView_pic.setImageDrawable(mPicture_3);
} else if (imageView_pic.getDrawable().equals(mPicture_3)) {
textView_desc.setText("儿时的我们...");
imageView_pic.setImageDrawable(mPicture_1);
}
imageView_pic.clearAnimation();
imageView_pic.startAnimation(mFadeIn);
}
});

}

}