zoukankan html css js c++ java

Android 实现 IOS相机滑动控件

　　 IOS相比于Android，动画效果是一方面优势，IOS相机切换时滑动的动画很不错，看着是有一个3D的效果，而且变化感觉很自然。Android也可以通过Graphics下面的Camera可以实现3D效果，开始尝试着用这个做了一下，效果不理想，滑动之后各组文字之间的距离就变了，从立体空间来说这是合逻辑的，但是看着很别捏。IOS相机的滑动效果文字之间的间隔在滑动的时候是不变的。

　　后面通过调整TextView X方向的scale使文字看着紧凑一点，然后通过计算的距离的方式，在滑动的时候保持各组文字之间的间隔一致，最后实现的效果还是和IOS的有一定的差距。先上个效果图的。

下面逐步来说下怎么实现：

　　MainaActivity.java:

　　往自定义的控件加了6个TextView，对应各个模式。

　　这里面还实现了一个手势监听，来识别滑动事件。对动画做了一些限制，角度小于30度，滑动距离大于15才能生效。

  1 package com.example.androidcustomnview;
  2 
  3 import android.app.Activity;
  4 import android.graphics.Color;
  5 import android.os.Bundle;
  6 import android.util.Log;
  7 import android.view.GestureDetector;
  8 import android.view.GestureDetector.OnGestureListener;
  9 import android.view.View;
 10 import android.view.View.OnTouchListener;
 11 import android.view.MotionEvent;
 12 import android.view.TextureView;
 13 import android.view.ViewGroup;
 14 import android.view.animation.Animation;
 15 import android.view.animation.Animation.AnimationListener;
 16 import android.view.animation.AnimationSet;
 17 import android.view.animation.TranslateAnimation;
 18 import android.widget.FrameLayout;
 19 import android.widget.LinearLayout;
 20 import android.widget.RelativeLayout;
 21 import android.widget.TextView;
 22 
 23 public class MainActivity extends Activity  implements OnTouchListener{
 24 
 25     private static final String TAG = "MainActivity.TAG";
 26     CustomViewL mCustomViewL;
 27     String[] name = new String[] {"延时摄影","慢动作","视频","拍照","正方形","全景"};
 28 
 29     GestureDetector mGestureDetector;
 30     RelativeLayout rootView;
 31     @Override
 32     protected void onCreate(Bundle savedInstanceState) {
 33         super.onCreate(savedInstanceState);
 34         setContentView(R.layout.activity_main);
 35         mCustomViewL = (CustomViewL) findViewById(R.id.mCustomView);
 36         rootView = (RelativeLayout) findViewById(R.id.ViewRoot);
 37         rootView.setOnTouchListener(this);
 38         mCustomViewL.getParent();
 39         mCustomViewL.addIndicator(name);
 40         mGestureDetector = new GestureDetector(this, new myGestureDetectorLis()); 48     }
 49     
 50     class myGestureDetectorLis implements GestureDetector.OnGestureListener {
 51         
 52         private static final int degreeLimit = 30;
 53         private static final int distanceLimit = 15;
 54         
 55         private boolean isScroll = false;
 56         @Override
 57         public boolean onDown(MotionEvent e) {
 58             // TODO Auto-generated method stub
 59             Log.d(TAG, "myGestureDetectorLis onDown");
 60             isScroll = false;
 61             return true;
 62         }
 63         @Override
 64         public void onShowPress(MotionEvent e) {
 65             // TODO Auto-generated method stub
 66             
 67         }
 68         @Override
 69         public boolean onSingleTapUp(MotionEvent e) {
 70             // TODO Auto-generated method stub
 71             return false;
 72         }
 73         
 74         @Override
 75         public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
 76                 float distanceY) {
 77             // TODO Auto-generated method stub
 78             if (isScroll) return false;
 79             double degree = Math.atan(Math.abs(e2.getY() - e1.getY()) / Math.abs(e2.getX() - e1.getX())) * 180 /Math.PI;
 80             float delta = e2.getX() - e1.getX();
 81             if (delta > distanceLimit && degree < degreeLimit) {
 82                 Log.d(TAG, "向右滑");
 83                 isScroll = true;
 84                 mCustomViewL.scrollRight();
 85             } else if (delta < -distanceLimit && degree < degreeLimit) {
 86                 Log.d(TAG, "向左滑");
 87                 isScroll = true;
 88                 mCustomViewL.scrollLeft();
 89             }
 90             return false;
 91         }
 92         
 93         @Override
 94         public void onLongPress(MotionEvent e) {
 95             // TODO Auto-generated method stub
 96             
 97         }
 98         @Override
 99         public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
100                 float velocityY) {
101             // TODO Auto-generated method stub
102             return false;
103         }
104         
105     }
106 
107     @Override
108     public boolean onTouch(View v, MotionEvent event) {
109         // TODO Auto-generated method stub
110         return mGestureDetector.onTouchEvent(event);
111     }
112 
113 
114 }

CustomViewL.java:

　　自定义的控件，继承自LinearLayout。在onLayout里面，重新计算了下各个子控件的位置，因为各组文字的scale是不一样的，必须重新Layout一下各个子控件的位置，是文字的显示区域和点击区域是一样的，这样给各个子控件设置的onClick事件才有效。

　　dispatchDraw方法是重绘各个子控件，更具各个子控件到中心控件的位置的距离，设置了各个TextView X方向的scale,为了就是看着要有一个立体的效果。

　　滑动之后，开始一个动画，动画结束之后重新requestLayout一下，重新计算下各个控件的位置。这个可以连续滑动的，如果这次动画在执行，会保存一下，等动画完了之后会接着跑下一个动画。各个子控件滑动距离的计算有兴趣的可以自己研究下，这里就不赘述了，其实也是数学知识。

  1 package com.example.androidcustomnview;
  2 
  3 import android.content.Context;
  4 import android.graphics.Camera;
  5 import android.graphics.Canvas;
  6 import android.graphics.Color;
  7 import android.graphics.LinearGradient;
  8 import android.graphics.Matrix;
  9 import android.graphics.Paint;
 10 import android.graphics.Shader;
 11 import android.os.Handler;
 12 import android.os.Message;
 13 import android.util.AttributeSet;
 14 import android.util.Log;
 15 import android.view.MotionEvent;
 16 import android.view.View;
 17 import android.view.WindowManager;
 18 import android.view.animation.Animation;
 19 import android.view.animation.Animation.AnimationListener;
 20 import android.view.animation.TranslateAnimation;
 21 import android.widget.LinearLayout;
 22 import android.widget.TextView;
 23 
 24 public class CustomViewL extends LinearLayout {
 25 
 26     private static final String TAG = "CustomViewL.TAG";
 27     private Matrix mMatrix;
 28     Camera mCamera;
 29     private int mCurrentItem = 2;    
 30     private int screenWidth;
 31     private Paint mPaint;
 32 
 33     public static final float ItemScale = 0.1f;
 34 
 35     public CustomViewL(Context context) {
 36         super(context);
 37         // TODO Auto-generated constructor stub
 38         initView(context);
 39     }
 40     
 41     public CustomViewL(Context context, AttributeSet attrs, int defStyleAttr,
 42             int defStyleRes) {
 43         super(context, attrs, defStyleAttr, defStyleRes);
 44         initView(context);
 45     }
 46 
 47     public CustomViewL(Context context, AttributeSet attrs, int defStyleAttr) {
 48         super(context, attrs, defStyleAttr);
 49         initView(context);
 50     }
 51 
 52     public CustomViewL(Context context, AttributeSet attrs) {
 53         super(context, attrs);
 54         initView(context);
 55     }
 56     
 57     private void initView(Context context) {
 60         screenWidth = ((WindowManager)getContext().getSystemService(Context.WINDOW_SERVICE))
 61                 .getDefaultDisplay().getWidth();
 63     }
 64     
 65     @Override
 66     protected void onLayout(boolean changed, int l, int t, int r, int b) {
 67         Log.d(TAG, "onLayout ");
 68         super.onLayout(changed, l , t, r, b);
 69         View v = getChildAt(mCurrentItem);
 70         int delta = getWidth() / 2 - v.getLeft() - v.getWidth()/2;
 71          
 72         for (int i = 0; i < getChildCount(); i++) {
 73             View v1 = getChildAt(i);
 74             if (i == mCurrentItem) {
 75                 v1.layout(v1.getLeft() + delta, v1.getTop(), 
 76                     v1.getRight() + delta, v1.getBottom());
 77                 continue;
 78             }
 79             float mScale = Math.abs(i - mCurrentItem) * ItemScale;
 80             int move = (int)(v1.getWidth() * mScale / 2);
 81             if (i < mCurrentItem) {
 82                 for (int j = i + 1; j < mCurrentItem; j++) {
 83                     View v2 = getChildAt(j);
 84                     move += (int) (v2.getWidth() * Math.abs(j - mCurrentItem) * ItemScale);
 85                 }
 86             } else {
 87                 for (int j = i - 1; j > mCurrentItem; j--) {
 88                     View v2 = getChildAt(j);
 89                     move += (int)(v2.getWidth() * Math.abs(j - mCurrentItem) * ItemScale);
 90                 }
 91                 move = -move;
 92             }
 93             v1.layout(v1.getLeft() + delta + move, v1.getTop(), 
 94                     v1.getRight() + delta + move, v1.getBottom());
 95         }
 96         mRequstLayout = false;
 97     }
 98 
 99     @Override
100     protected void dispatchDraw(Canvas canvas) {
101         int count = getChildCount();
102         for (int i = 0; i < count; i++) {
103             updateChildItem(canvas,i);
104         }
105     }
106     
107     public void updateChildItem(Canvas canvas,int item) {
108 //        Log.d(TAG, "updateChildItem");
110         View v = getChildAt(item);        
111         float desi = 1- Math.abs(item - mCurrentItem) * ItemScale;
112         ((TextView)v).setScaleX(desi);
113         drawChild(canvas, v, getDrawingTime());
114         updateTextColor();        
115     }    
118     private void updateTextColor() {
119         for (int i =0 ; i < getChildCount(); i++) {
120             if (i == mCurrentItem) {
121                 ((TextView)getChildAt(i)).setTextColor(Color.YELLOW);
122             } else {
123                 ((TextView)getChildAt(i)).setTextColor(Color.WHITE);
124             }
125         }
126     }     
128     boolean scroolToRight = false;
129     
130     public void scrollRight() {
131         if (mRequstLayout) return;
132         if (mCurrentItem > 0) {
133             if (mAnimationRunning) {
134                 if (AnimationRunningCount < 1) {
135                     currentItemCopy = mCurrentItem - 1;
136                     AnimationRunningCount++;
137                     scroolToRight = true;
138                 }
139                 return;
140             }
141             mCurrentItem--;
142             startTraAnimation(mCurrentItem,mCurrentItem + 1);
143             updateTextColor();
144         }
145     }
146     
147     private int currentItemCopy;
148     public void scrollLeft() {
149         if (mRequstLayout) return;
150         if (mCurrentItem < getChildCount() - 1) {
151             if (mAnimationRunning) {
152                 if (AnimationRunningCount < 1) {
153                     currentItemCopy = mCurrentItem + 1;
154                     AnimationRunningCount++;
155                     scroolToRight = false;
156                 }
157                 return;
158             }
159             mCurrentItem++;
160             startTraAnimation(mCurrentItem,mCurrentItem-1);
161             updateTextColor();
162         }    
163     }
164     
165     public void addIndicator(String[] name) {
166         for (int i=0; i< name.length; i++) {
167             TextView mTextView = new TextView(getContext());
168             mTextView.setText(name[i]);
169             mTextView.setTextColor(Color.WHITE);
170             mTextView.setLines(1);
171             LinearLayout.LayoutParams ll = new LinearLayout.LayoutParams(
172                     LinearLayout.LayoutParams.WRAP_CONTENT, 
173                     LinearLayout.LayoutParams.WRAP_CONTENT);
174             ll.setMargins(20, 0, 20, 0);
175             addView(mTextView,ll);
176         }
177     }
178     
179     class myAnimationListener implements android.view.animation.Animation.AnimationListener {
180 
181         @Override
182         public void onAnimationStart(Animation animation) {
183             Log.d(TAG, "onAnimationStart ");
184             mAnimationRunning = true;
185         }
186         @Override
187         public void onAnimationEnd(Animation animation) {
188             // TODO Auto-generated method stub
189             Log.d(TAG, "onAnimationEnd ");
190 
191             for (int i= 0; i < getChildCount(); i++) {
192                 getChildAt(i).clearAnimation();
193             }
194             mRequstLayout = true;
195             requestLayout();
196             mAnimationRunning = false;
197             if (AnimationRunningCount > 0) {
198                 CustomViewL.this.post(new Runnable() {
199                     @Override
200                     public void run() {
201                         // TODO Auto-generated method stub
202                         AnimationRunningCount--;
203                         mCurrentItem = currentItemCopy;
204                         int lastItem = scroolToRight ? currentItemCopy + 1 : currentItemCopy - 1;
205                         startTraAnimation(currentItemCopy,lastItem);
206                         updateTextColor();
207                     }
208                 });
209             }
210         }
211         @Override
212         public void onAnimationRepeat(Animation animation) {
213         }
214         
215     }
216     
217     private int AnimitionDurationTime = 300;
218     private int AnimationRunningCount = 0;
219     private boolean mAnimationRunning = false;
220     private boolean mRequstLayout = false;
221     public void startTraAnimation(int item,int last) {
222         Log.d(TAG, "startTraAnimation item = " + item);
223         View v = getChildAt(item);
224         final int width = v.getWidth();
225         final int childCount = getChildCount();
226         int traslate = getWidth()/2 - v.getLeft() - width/2;
227         
228         int currentItemWidthScale = (int) (width * ItemScale);
229 
230         for (int i = 0; i < childCount; i++) {
231             int delta = currentItemWidthScale / 2;            
233             Log.d(TAG, " i = " + i + "  delta before = " + delta);    
234             if (i < item) {
235                 delta = -delta;
236                 for (int j = i; j < item; j++) {
237                     int a;
238                     if (i == j) {
239                         a = (int)(getChildAt(j).getWidth() * ItemScale / 2);
240                     } else {
241                         a = (int)(getChildAt(j).getWidth() * ItemScale);
242                     }
243                     delta = item < last ? delta - a : delta + a;
244                 }
245             } else if (i > item){
246                 for (int j = item + 1; j <= i; j++) {
247                     int a;
248                     if (j == i) {
249                         a = (int)(getChildAt(j).getWidth() * ItemScale / 2);
250                     } else {
251                         a = (int)(getChildAt(j).getWidth() * ItemScale);
252                     }
253                     delta = item < last ? delta - a : delta + a;
254                 }
255             } else {
256                 delta = 0;
257             }
258             Log.d(TAG, "delta  = " + delta);
259             delta += traslate;
260             TranslateAnimation translateAni = new TranslateAnimation(0, delta, 0, 0);
261             translateAni.setDuration(AnimitionDurationTime);
262             translateAni.setFillAfter(true);
263             if (i == item) translateAni.setAnimationListener(new myAnimationListener());
264             mAnimationRunning = true;
265             getChildAt(i).startAnimation(translateAni);
266         }
268     }
269 }

最后说一下布局文件，两边本来是要做一个阴影效果的，为了简便，复习了下PS,就在上面盖了张图片，显得两边有阴影。

<RelativeLayout 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"
    tools:context="com.example.androidcustomnview.MainActivity" >

    <RelativeLayout
        android:id="@+id/ViewRoot"
        android:gravity="center" 
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <com.example.androidcustomnview.CustomViewL
            android:orientation="horizontal"
            android:background="@android:color/background_dark"
            android:id="@+id/mCustomView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            >
            
        </com.example.androidcustomnview.CustomViewL>
        <ImageView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@id/mCustomView"
            android:layout_alignTop="@id/mCustomView"
            android:layout_alignRight="@id/mCustomView"
            android:layout_alignBottom="@id/mCustomView"
            android:background="@drawable/test"/>
        
    </RelativeLayout>
</RelativeLayout>

　　整个来说其实也不复杂，有好些数学计算，几何问题，效果也没达到iphone的效果，如果有大神有想法，可以指导下。

查看全文

相关阅读:
从安装.net Core 到helloWord(Mac上)
阿里云-对象储存OSS
图片处理
 项目中添加 swift代码真机调试错误
 iOS面试总结
 IOS APP配置.plist汇总
 cocoapods安装问题
 iOS8使用UIVisualEffectView实现模糊效果
 ios键盘回收终极版
 ?C++ 缺少参数的默认参数

原文地址：https://www.cnblogs.com/xiaojianli/p/5689480.html