android中无限循环滑动的gallery实例
android中无限循环滑动的gallery实例
1.点击图片有变暗的效果，使用imageview.setAlpha(),并且添加ontouchListener
1 public void init() { 2 dots = new ImageView[len]; 3 for (int j = 0; j < len; j++) { 4 // 添加图片 5 final ImageView iv = new ImageView(this); 6 iv.setImageResource(res[j]); 7 views.add(iv); 8 iv.setOnTouchListener(new OnTouchListener() { 9 10 @Override 11 public boolean onTouch(View v, MotionEvent event) { 12 if (event.getAction() == MotionEvent.ACTION_DOWN) { 13 iv.setAlpha(70); 14 slideHandler.removeCallbacks(slideRun); 15 } 16 return false; 17 } 18 }); 19 // 添加索引 20 ImageView imageView = new ImageView(this); 21 imageView.setLayoutParams(new LayoutParams(15, 15)); 22 dots[j] = imageView; 23 TextView tv = new TextView(this); 24 tv.setText(" "); 25 if (j == 0) { 26 // 默认进入程序后第一张图片被选中; 27 dots[j].setBackgroundResource(R.drawable.yst_i_pageon); 28 } else { 29 dots[j].setBackgroundResource(R.drawable.yst_i_pageoff); 30 } 31 32 layout_point.addView(tv); 33 layout_point.addView(imageView); 34 } 35 gallery.setAdapter(new ImageAdapter()); 36 gallery.setSelection((Integer.MAX_VALUE / 2) - (Integer.MAX_VALUE / 2) 37 % len); 38 gallery.setOnItemSelectedListener(selectListener); 39 ((MyGallery) gallery).setViews(views); 40 // TODO 定时滑动 41 startSlide(); 42 }
2.无限滑动，自定义adapter,设置count为最大值，图片总数循环从0到图片的总长度
1 public class ImageAdapter extends BaseAdapter { 2 3 public int getCount() { 4 if (views != null) { 5 return Integer.MAX_VALUE; 6 } else { 7 return 0; 8 } 9 } 10 11 public Object getItem(int position) { 12 if (position >= len) { 13 position = position % len; 14 } 15 16 return position; 17 } 18 19 public long getItemId(int position) { 20 if (position >= len) { 21 position = position % len; 22 } 23 return position; 24 } 25 26 public View getView(int position, View convertView, ViewGroup parent) { 27 View view = convertView; 28 if (position >= len) { 29 position = position % len; 30 } 31 if (view == null) { 32 view = views.get(position); 33 } 34 35 return view; 36 } 37 }
3.自动滑动，自定义gallery,重写onFling方法，触摸时，停止滑动，弹起时继续滑动
1 public class MyGallery extends Gallery { 2 3 private List<ImageView> views; 4 /** 左边 */ 5 public static final int LEFT = 0; 6 /** 右边 */ 7 public static final int RIGHT = 1; 8 9 public MyGallery(Context context) { 10 super(context); 11 // TODO Auto-generated constructor stub 12 } 13 14 public MyGallery(Context context, AttributeSet attrs, int defStyle) { 15 super(context, attrs, defStyle); 16 // TODO Auto-generated constructor stub 17 } 18 19 public MyGallery(Context context, AttributeSet attrs) { 20 super(context, attrs); 21 // TODO Auto-generated constructor stub 22 } 23 24 /** 设置视图 */ 25 public void setViews(List<ImageView> views) { 26 this.views = views; 27 } 28 29 @Override 30 public boolean onTouchEvent(MotionEvent event) { 31 // TODO Auto-generated method stub 32 if (event.getAction() == MotionEvent.ACTION_UP) { 33 // 遍历views 设置alpha 34 if (views != null && !views.isEmpty()) { 35 for (ImageView iv : views) { 36 iv.setAlpha(255); 37 } 38 } 39 Context context = this.getContext(); 40 if (context != null && context instanceof MainActivity) { 41 MainActivity main=(MainActivity) context; 42 main.startSlide(); 43 } 44 } 45 return super.onTouchEvent(event); 46 } 47 48 /** 滑动 direction=1向右，-1向左 */ 49 public void slide(int direction) { 50 // MotionEvent e1 = MotionEvent.obtain(SystemClock.uptimeMillis(), 51 // SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, 52 // 89.333336f, 265.33334f, 0); 53 // MotionEvent e2 = MotionEvent.obtain(SystemClock.uptimeMillis(), 54 // SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, 300.0f, 55 // 238.00003f, 0); 56 if (direction == this.RIGHT) 57 this.onFling(null, null, -1200, 0); 58 else { 59 this.onFling(null, null, 1200, 0); 60 } 61 } 62 }
下面贴出完整代码：
布局xml:
<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" android:background="@android:color/background_light" tools:context=".MainActivity" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_centerInParent="true" android:gravity="center" android:orientation="vertical" > <com.allen.gallery.MyGallery android:id="@+id/mygallery" android:layout_width="fill_parent" android:layout_height="160dp" android:fadingEdge="horizontal|vertical" android:fadingEdgeLength="20dp" /> <LinearLayout android:id="@+id/layout_dots" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:orientation="horizontal" > </LinearLayout> </LinearLayout> </RelativeLayout>
2.完整的实现代码：
1 package com.allen.gallery; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 import android.app.Activity; 7 import android.os.Bundle; 8 import android.os.Handler; 9 import android.view.MotionEvent; 10 import android.view.View; 11 import android.view.View.OnTouchListener; 12 import android.view.ViewGroup; 13 import android.view.ViewGroup.LayoutParams; 14 import android.widget.AdapterView; 15 import android.widget.BaseAdapter; 16 import android.widget.Gallery; 17 import android.widget.ImageView; 18 import android.widget.LinearLayout; 19 import android.widget.TextView; 20 21 public class MainActivity extends Activity { 22 private List<ImageView> views = new ArrayList<ImageView>(); 23 /** 图片资源 */ 24 private int[] res = new int[] { R.drawable.image1, R.drawable.image2, 25 R.drawable.image3, R.drawable.image4 }; 26 private ImageView[] dots; 27 int len = 4; 28 int currentItem = 0;// 当前选中的viewPager的item 29 private Gallery gallery; 30 private LinearLayout layout_point; 31 /** 定时滑动 */ 32 private final Handler slideHandler = new Handler(); 33 /** 滑动 */ 34 private final Runnable slideRun = new Runnable() { 35 36 @Override 37 public void run() { 38 // TODO Auto-generated method stub 39 currentItem++; 40 currentItem = checkPosition(currentItem); 41 ((MyGallery) gallery).slide(MyGallery.RIGHT); 42 slideHandler.postDelayed(this, 2000); 43 } 44 }; 45 46 @Override 47 protected void onCreate(Bundle savedInstanceState) { 48 super.onCreate(savedInstanceState); 49 setContentView(R.layout.activity_main); 50 // 初始化中间 51 layout_point = (LinearLayout) this.findViewById(R.id.layout_dots); 52 gallery = (Gallery) findViewById(R.id.mygallery); 53 gallery.setSpacing(20); 54 init(); 55 } 56 57 public void init() { 58 dots = new ImageView[len]; 59 for (int j = 0; j < len; j++) { 60 // 添加图片 61 final ImageView iv = new ImageView(this); 62 iv.setImageResource(res[j]); 63 views.add(iv); 64 iv.setOnTouchListener(new OnTouchListener() { 65 66 @Override 67 public boolean onTouch(View v, MotionEvent event) { 68 if (event.getAction() == MotionEvent.ACTION_DOWN) { 69 iv.setAlpha(70); 70 slideHandler.removeCallbacks(slideRun); 71 } 72 return false; 73 } 74 }); 75 // 添加索引 76 ImageView imageView = new ImageView(this); 77 imageView.setLayoutParams(new LayoutParams(15, 15)); 78 dots[j] = imageView; 79 TextView tv = new TextView(this); 80 tv.setText(" "); 81 if (j == 0) { 82 // 默认进入程序后第一张图片被选中; 83 dots[j].setBackgroundResource(R.drawable.yst_i_pageon); 84 } else { 85 dots[j].setBackgroundResource(R.drawable.yst_i_pageoff); 86 } 87 88 layout_point.addView(tv); 89 layout_point.addView(imageView); 90 } 91 gallery.setAdapter(new ImageAdapter()); 92 gallery.setSelection((Integer.MAX_VALUE / 2) - (Integer.MAX_VALUE / 2) 93 % len); 94 gallery.setOnItemSelectedListener(selectListener); 95 ((MyGallery) gallery).setViews(views); 96 // TODO 定时滑动 97 startSlide(); 98 } 99 100 private AdapterView.OnItemSelectedListener selectListener = new AdapterView.OnItemSelectedListener() { 101 102 @Override 103 public void onItemSelected(AdapterView<?> parent, View view, 104 int position, long id) { 105 // TODO Auto-generated method stub 106 if (position >= len) { 107 position = position % len; 108 currentItem = position; 109 } 110 selectPage(); 111 } 112 113 @Override 114 public void onNothingSelected(AdapterView<?> parent) { 115 // TODO Auto-generated method stub 116 } 117 }; 118 119 public class ImageAdapter extends BaseAdapter { 120 121 public int getCount() { 122 if (views != null) { 123 return Integer.MAX_VALUE; 124 } else { 125 return 0; 126 } 127 } 128 129 public Object getItem(int position) { 130 if (position >= len) { 131 position = position % len; 132 } 133 134 return position; 135 } 136 137 public long getItemId(int position) { 138 if (position >= len) { 139 position = position % len; 140 } 141 return position; 142 } 143 144 public View getView(int position, View convertView, ViewGroup parent) { 145 View view = convertView; 146 if (position >= len) { 147 position = position % len; 148 } 149 if (view == null) { 150 view = views.get(position); 151 } 152 153 return view; 154 } 155 } 156 157 /** 开始滑动 */ 158 public void startSlide() { 159 slideHandler.postDelayed(slideRun, 2000); 160 } 161 162 public int checkPosition(int position) { 163 if (position >= len) { 164 position = position % len; 165 } 166 167 return position; 168 } 169 170 /** 设置当前选中页 */ 171 private void selectPage() { 172 /** 设置当前显示的页码 */ 173 for (int i = 0; i < len; i++) { 174 dots[currentItem].setBackgroundResource(R.drawable.yst_i_pageon); 175 if (currentItem != i) { 176 dots[i].setBackgroundResource(R.drawable.yst_i_pageoff); 177 } 178 } 179 } 180 }
下载就不用了吧。。。
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