转载请注明出处:王亟亟的大牛之路
昨天想着模仿写些什么,然后觉得什么仿京东啊,仿美团之类的外面都有,正好又找到点资源就写了这篇“高仿微信图片放大”
废话不多说,先看下效果:
先是微信的
再是模仿的
包目录
先说下实现原理,再一步步分析
这里总共有2个Activity一个就是主页,一个就是显示我们图片效果的页面,参数通过Intent传送,素材内容均来自网络,(感谢聪明的蘑菇) 图片都是Glide异步下的,下的,下的重要的事情说三次,然后就是用动画做放大操作然后显示出来了(并没有做下载原图的实现,反正也是一样 下载下来Set上去而且动画都不需要更简便)。
OK,我们来看分析下
obj,目录下分别创建了2个对象,一个用来使用来处理显示页面的图片尺寸信息以及位置信息,还有一个是用来附带URL和分辨率
Config这个类就是我们的URL了没其他什么内容。
我们一个一个页面来看,先看MainActivity
他做的事情很简单,就是把下个页面的一些信息初始化一下然后通过Intent传过去,本身不做什么多余操作
package wjj.com.imitatewechatimage.activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import wjj.com.imitatewechatimage.R;
import com.apkfuns.logutils.LogUtils;
import com.bumptech.glide.Glide;
import wjj.com.imitatewechatimage.Config;
import wjj.com.imitatewechatimage.obj.ImageInfoObj;
import wjj.com.imitatewechatimage.obj.ImageWidgetInfoObj;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ImageView imageView;
private ImageInfoObj imageInfoObj;
private ImageWidgetInfoObj imageWidgetInfoObj;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findId();
init();
Listener();
}
private void findId() {
imageView = (ImageView) findViewById(R.id.imageView);
}
private void init() {
Glide.with(MainActivity.this).load(Config.IMAGE_URL).placeholder(R.mipmap.maimai).into(imageView);
imageInfoObj = new ImageInfoObj();
imageInfoObj.imageUrl = Config.IMAGE_URL;
imageInfoObj.imageWidth = 1280;
imageInfoObj.imageHeight = 720;
imageWidgetInfoObj = new ImageWidgetInfoObj();
imageWidgetInfoObj.x = imageView.getLeft();
imageWidgetInfoObj.y = imageView.getTop();
imageWidgetInfoObj.width = imageView.getLayoutParams().width;
imageWidgetInfoObj.height = imageView.getLayoutParams().height;
}
private void Listener() {
imageView.setOnClickListener(this);
}
@Override
protected void onResume() {
super.onResume();
LogUtils.d("--->MainActivity onResume");
}
@Override
protected void onPause() {
super.onPause();
LogUtils.d("--->MainActivity onPause");
}
@Override
protected void onDestroy() {
super.onDestroy();
LogUtils.d("--->MainActivity onDestroy");
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.imageView:
//携带参数跳转
Intent intent = new Intent(MainActivity.this, howImageActivity.class);
intent.putExtra("imageInfoObj", imageInfoObj);
intent.putExtra("imageWidgetInfoObj", imageWidgetInfoObj);
startActivity(intent);
break;
default:
break;
}
}
}
具体业务类ShowImageActivity
public class ShowImageActivity extends AppCompatActivity {
private RelativeLayout MainView;
private ImageView showImageView;
private ImageInfoObj imageInfoObj;
private ImageWidgetInfoObj imageWidgetInfoObj;
Button button;
// 屏幕宽度
public float Width;
//原图高
private float y_img_h;
// 屏幕高度
public float Height;
private float size, size_h, img_w, img_h;
protected float to_x = 0;
protected float to_y = 0;
private float tx;
private float ty;
private final Spring spring = SpringSystem
.create()
.createSpring()
.addListener(new ExampleSpringListener());
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_how_image);
LogUtils.d("--->ShowImageActivity onCreate");
findId();
init();
Listener();
}
private void findId() {
MainView = (RelativeLayout) findViewById(R.id.MainView);
button = (Button) findViewById(R.id.button);
}
private void init() {
DisplayMetrics dm = getResources().getDisplayMetrics();
Width = dm.widthPixels;
Height = dm.heightPixels;
imageInfoObj = (ImageInfoObj) getIntent().getSerializableExtra("imageInfoObj");
imageWidgetInfoObj = (ImageWidgetInfoObj) getIntent().getSerializableExtra("imageWidgetInfoObj");
if (imageInfoObj == null) {
LogUtils.d("--->imageInfoObj==null");
}
if (imageWidgetInfoObj == null) {
LogUtils.d("--->imageWidgetInfoObj==null");
}
showImageView = new ImageView(this);
showImageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
Glide.with(ShowImageActivity.this).load(imageInfoObj.imageUrl).into(showImageView);
img_w = imageWidgetInfoObj.width;
img_h = imageWidgetInfoObj.height - 300;
size = Width / img_w;
y_img_h = imageInfoObj.imageHeight * Width / imageInfoObj.imageWidth;
size_h = y_img_h / img_h;
RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams((int) imageWidgetInfoObj.width,
(int) imageWidgetInfoObj.height);
p.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
p.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);
showImageView.setLayoutParams(p);
p.setMargins((int) imageWidgetInfoObj.x,
(int) imageWidgetInfoObj.y, (int) (Width - (imageWidgetInfoObj.x + imageWidgetInfoObj.width)),
(int) (Height - (imageWidgetInfoObj.y + imageWidgetInfoObj.height)));
MainView.addView(showImageView);
new Handler().post(new Runnable() {
public void run() {
ShowImageView();
}
});
}
private void Listener() {
showImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ShowImageView();
}
});
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ShowImageView();
}
});
}
@Override
protected void onResume() {
super.onResume();
LogUtils.d("--->ShowImageActivity onResume");
}
@Override
protected void onPause() {
super.onPause();
LogUtils.d("--->ShowImageActivity onPause");
}
@Override
protected void onDestroy() {
super.onDestroy();
LogUtils.d("--->ShowImageActivity onDestroy");
}
private class ExampleSpringListener implements SpringListener {
@Override
public void onSpringUpdate(Spring spring) {
double CurrentValue = spring.getCurrentValue();
float mappedValue = (float) SpringUtil.mapValueFromRangeToRange(CurrentValue, 0, 1, 1, size);
float mapy = (float) SpringUtil.mapValueFromRangeToRange(CurrentValue, 0, 1, 1, size_h);
showImageView.setScaleX(mappedValue);
showImageView.setScaleY(mapy);
if (CurrentValue == 1) {
// showImageView.setVisibility(View.GONE);
}
}
@Override
public void onSpringAtRest(Spring spring) {
}
@Override
public void onSpringActivate(Spring spring) {
}
@Override
public void onSpringEndStateChange(Spring spring) {
}
}
//实现效果
private void MoveView() {
ObjectAnimator.ofFloat(MainView, "alpha", 0.8f).setDuration(0).start();
MainView.setVisibility(View.VISIBLE);
AnimatorSet set = new AnimatorSet();
set.playTogether(
ObjectAnimator.ofFloat(showImageView, "translationX", tx).setDuration(200),
ObjectAnimator.ofFloat(showImageView, "translationY", ty).setDuration(200),
ObjectAnimator.ofFloat(MainView, "alpha", 1).setDuration(200)
);
set.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
}
@Override
public void onAnimationEnd(Animator animator) {
showImageView.setScaleType(ImageView.ScaleType.FIT_XY);
spring.setEndValue(1);
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
set.start();
}
//关闭页面
private void MoveBackView() {
AnimatorSet set = new AnimatorSet();
set.playTogether(
ObjectAnimator.ofFloat(showImageView, "translationX", to_x).setDuration(200),
ObjectAnimator.ofFloat(showImageView, "translationY", to_y).setDuration(200)
);
set.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
}
@Override
public void onAnimationEnd(Animator animator) {
finish();
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
set.start();
}
//具体动画处理类
private void ShowImageView() {
if (spring.getEndValue() == 0) {
//弹动摩擦力
spring.setSpringConfig(SpringConfig.fromOrigamiTensionAndFriction(300, 5));
//动画结束后出现的位置
tx = 0;
ty = Height / 2 - (imageWidgetInfoObj.y + img_h + 600);
MoveView();
return;
}
spring.setSpringConfig(SpringConfig.fromOrigamiTensionAndFriction(1, 5));
spring.setEndValue(0);
new Handler().post(new Runnable() {
public void run() {
MoveBackView();
}
});
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
showImageView.setVisibility(View.VISIBLE);
ShowImageView();
}
return true;
}
}
大致流程:
1.在 init()获取了屏幕信息,上一个类传来的参数,以及对坐标点进行了一些计算 ,然后用Handler来启动动画的效果
2.ShowImageView()处理了动画的实现,(动画效果是compile ‘com.facebook.rebound:rebound:0.3.8‘
实现的,这边不做教程了给出传送门:http://facebook.github.io/rebound/)
总结:
总体实现并不是太难,因为有框架的关系,使得复杂的动画部分不用自己去写,调用下在回调里做业务就行,这里补充下一些过程中用到的技术点
1.图片的缩放模式:http://blog.csdn.net/encienqi/article/details/7913262
2.Layout常用的属性:http://blog.csdn.net/richway2010/article/details/6587842
这个例子只是例子,部分坐标和样式是写死的,如果要运用到实际项目中还是要些许就该,在操作的过程中还对加载多图片进行了测试,暂未发生OOM的情况,补上内存使用情况图(一直很稳定)
代码地址:https://github.com/ddwhan0123/BlogSample/tree/master/ImitateWeChatImage
源码下载地址:https://github.com/ddwhan0123/BlogSample/blob/master/ImitateWeChatImage/ImitateWeChatImage.zip?raw=true
Thanks for DavidWang