viewpager欢迎页面底部点的滑动效果
2024-08-23 18:37:05
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<androidx.viewpager.widget.ViewPager
android:id="@+id/vp_guide"
android:layout_width="match_parent"
android:layout_height="match_parent">
</androidx.viewpager.widget.ViewPager> <RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="30dip"> <LinearLayout
android:id="@+id/ll_guide_points"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
</LinearLayout> <View
android:id="@+id/v_guide_redpoint"
android:layout_width="10px"
android:layout_height="10px"
android:background="@drawable/shap"/> </RelativeLayout> </RelativeLayout>
public class MyAdapter extends PagerAdapter {
private List<ImageView> mGuids;
public MyAdapter(Context ctx, List<ImageView> guids) {
this.mGuids = guids;
}
@Override
public int getCount() {
return mGuids.size();// 返回数据的个数
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;// 过滤和缓存的作用
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);//从viewpager中移除掉
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
// container viewpaper
//获取View
View child = mGuids.get(position);
// 添加View
container.addView(child);
return child;
}
}
public class MainActivity extends AppCompatActivity {
private ViewPager mVp_Guide;
private View mGuideRedPoint;
private LinearLayout mLlGuidePoints;
private int[] mPics = new int[]{R.drawable.lunch1, R.drawable.lunch2, R.drawable.lunch3, R.drawable.lunch4};
private View v_point;
private int disPoints;
private int currentItem;
private MyAdapter adapter;
private List<ImageView> guids;
private int width;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// UIUtils.init(getApplicationContext());
WindowManager windowManager = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
//获取屏幕的宽度
Point size = new Point();
windowManager.getDefaultDisplay().getSize(size);
width = size.x;
initView();
initData();
initEvent();
}
private void initView() {
mVp_Guide = (ViewPager) findViewById(R.id.vp_guide);
mGuideRedPoint = findViewById(R.id.v_guide_redpoint);
mLlGuidePoints = (LinearLayout) findViewById(R.id.ll_guide_points);
}
private void initData() {
// viewpaper adapter适配器
guids = new ArrayList<ImageView>();
//创建viewpager的适配器
for (int i = 0; i < mPics.length; i++) {
ImageView iv_temp = new ImageView(getApplicationContext());
iv_temp.setBackgroundResource(mPics[i]);
//添加界面的数据
guids.add(iv_temp);
//灰色的点在LinearLayout中绘制：
//获取点
v_point = new View(getApplicationContext());
v_point.setBackgroundResource(R.drawable.shap2);//灰点背景色
//设置灰色点的显示大小
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(10, 10);
//设置点与点的距离,第一个点除外
if (i != 0)
params.leftMargin = 47;
v_point.setLayoutParams(params);
mLlGuidePoints.addView(v_point);
}
// 创建viewpager的适配器
adapter = new MyAdapter(getApplicationContext(), guids);
// 设置适配器
mVp_Guide.setAdapter(adapter);
}
private void initEvent() {
//监听界面绘制完成
mGuideRedPoint.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
//取消注册界面而产生的回调接口
mGuideRedPoint.getViewTreeObserver().removeGlobalOnLayoutListener(this);
//计算点于点之间的距离
disPoints = (mLlGuidePoints.getChildAt(1).getLeft() - mLlGuidePoints.getChildAt(0).getLeft());
}
});
//滑动事件监听滑动距离，点更随滑动。
mVp_Guide.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
/* //当前viewpager显示的页码
//如果viewpager滑动到第三页码（最后一页），显示进入的button
if (position == guids.size() - 1) {
bt_startExp.setVisibility(View.VISIBLE);//设置按钮的显示
} else {
//隐藏该按钮
bt_startExp.setVisibility(View.GONE);
}*/
currentItem = position;
}
/**
*页面滑动调用，拿到滑动距离设置视图的滑动状态
* @param position 当前页面位置
* @param positionOffset 移动的比例值
* @param positionOffsetPixels 便宜的像素
*/
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
//计算红点的左边距
float leftMargin = disPoints * (position + positionOffset);
//设置红点的左边距
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) mGuideRedPoint.getLayoutParams();
//对folat类型进行四舍五入，
layoutParams.leftMargin = Math.round(leftMargin);
//设置位置
mGuideRedPoint.setLayoutParams(layoutParams);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
//给页面设置触摸事件
mVp_Guide.setOnTouchListener(new View.OnTouchListener() {
float startX;
float endX;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startX = event.getX();
break;
case MotionEvent.ACTION_UP:
endX = event.getX();
//首先要确定的是，是否到了最后一页，然后判断是否向左滑动，并且滑动距离是否符合，我这里的判断距离是屏幕宽度的4分之一（这里可以适当控制）
if (currentItem == (guids.size() - 1) && startX - endX >= (width / 4)) {
Toast.makeText( MainActivity.this, "跳转", Toast.LENGTH_SHORT ).show();
//进入主页
// Intent intent = new Intent(MainActivity.this, Main2Activity.class);
// startActivity(intent);
// //这部分代码是切换Activity时的动画，看起来就不会很生硬
// overridePendingTransition(android.R.anim.slide_in_left, android.R.anim.slide_out_right);
// finish();
}
break;
}
return false;
}
});
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
return true;
}
}
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval"> <corners android:radius="10dp"/>
<solid android:color="#e7e7e7"/>
<size android:width="10px"
android:height="10px"/> </shape>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<corners android:radius="10dp"/>
<solid android:color="#FF393939"/>
<size android:width="10px"
android:height="10px"/> </shape>
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