修复全屏模式滑动问题

laishujie · Jun 22, 2018 · 0c75e79 · 0c75e79
1 parent 81c5e04
commit 0c75e79
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Showing 5 changed files with 124 additions and 14 deletions.
diff --git a/app/src/main/java/com/lai/mtc/comm/widget/MyPagerSnapHelper.java b/app/src/main/java/com/lai/mtc/comm/widget/MyPagerSnapHelper.java
@@ -0,0 +1,74 @@
+package com.lai.mtc.comm.widget;
+
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.LinearSmoothScroller;
+import android.support.v7.widget.OrientationHelper;
+import android.support.v7.widget.PagerSnapHelper;
+import android.support.v7.widget.RecyclerView;
+import android.util.DisplayMetrics;
+import android.view.View;
+
+public class MyPagerSnapHelper extends PagerSnapHelper {
+
+    private RecyclerView mRecyclerView;
+    private static final float MILLISECONDS_PER_INCH = 100f;
+    private static final int MAX_SCROLL_ON_FLING_DURATION = 100; // ms
+
+    private int mExtraSpace = 0;
+
+    public MyPagerSnapHelper(int extraSpace) {
+        mExtraSpace = extraSpace;
+    }
+
+    @Override
+    public void attachToRecyclerView(@Nullable RecyclerView recyclerView) throws IllegalStateException {
+        super.attachToRecyclerView(recyclerView);
+        this.mRecyclerView = recyclerView;
+    }
+
+    @Override
+    protected LinearSmoothScroller createSnapScroller(RecyclerView.LayoutManager layoutManager) {
+        if (!(layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider)) {
+            return null;
+        }
+        return new LinearSmoothScroller(mRecyclerView.getContext()) {
+            @Override
+            protected void onTargetFound(View targetView, RecyclerView.State state, RecyclerView.SmoothScroller.Action action) {
+                int[] snapDistances = calculateDistanceToFinalSnap(mRecyclerView.getLayoutManager(),
+                        targetView);
+                int dx = snapDistances[0];
+                final int dy = snapDistances[1];
+                if (dx < 0) {
+                    dx += mExtraSpace * mRecyclerView.getWidth();
+                    if (dx > 0) {
+                        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
+                        int firstItemPosition = linearLayoutManager.findFirstVisibleItemPosition();
+                        if (firstItemPosition == 1) {
+                            dx = snapDistances[0] + mRecyclerView.getWidth();
+                        } else {
+                            dx = -dx;
+                        }
+                    }
+                }
+
+                final int time = calculateTimeForDeceleration(Math.max(Math.abs(dx), Math.abs(dy)));
+                if (time > 0) {
+                    action.update(dx, dy, time, mDecelerateInterpolator);
+                }
+            }
+
+            @Override
+            protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
+                return MILLISECONDS_PER_INCH / displayMetrics.densityDpi;
+            }
+
+            @Override
+            protected int calculateTimeForScrolling(int dx) {
+                return Math.min(MAX_SCROLL_ON_FLING_DURATION, super.calculateTimeForScrolling(dx));
+            }
+        };
+    }
+
+}
diff --git a/app/src/main/java/com/lai/mtc/comm/widget/PreCacheLayoutManager.java b/app/src/main/java/com/lai/mtc/comm/widget/PreCacheLayoutManager.java
@@ -9,19 +9,24 @@
  * @time 2018/2/6 18:05
  * @describe 预加载的LayoutManager
  * getExtraLayoutSpace()，增加不可见View的缓存的空间
- *
+ * <p>
  * http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0209/2452.html
- *
  */
 
 public class PreCacheLayoutManager extends LinearLayoutManager {
 
+    public int getExtraSpace() {
+        return mExtraSpace;
+    }
+
     private int mExtraSpace = 0;
 
+
     public PreCacheLayoutManager(Context context) {
         super(context);
     }
 
+
     public void setExtraSpace(int extraSpace) {
         mExtraSpace = extraSpace;
     }
@@ -38,4 +43,5 @@ protected int getExtraLayoutSpace(RecyclerView.State state) {
         }
         return 0;
     }
+
 }
diff --git a/app/src/main/java/com/lai/mtc/mvp/ui/comics/activity/ComicPreviewActivity.java b/app/src/main/java/com/lai/mtc/mvp/ui/comics/activity/ComicPreviewActivity.java
@@ -17,6 +17,7 @@
 import com.lai.mtc.R;
 import com.lai.mtc.bean.ComicListDetail;
 import com.lai.mtc.bean.ComicPreView;
+import com.lai.mtc.comm.widget.MyPagerSnapHelper;
 import com.lai.mtc.comm.widget.PreCacheLayoutManager;
 import com.lai.mtc.comm.widget.TouchRecyclerView;
 import com.lai.mtc.dao.RecordDao;
@@ -159,7 +160,7 @@ public void init(Bundle savedInstanceState) {
         mComicListDetail = (ComicListDetail) getIntent().getSerializableExtra("comicListDetail");
         index = getIntent().getIntExtra("index", 1);
         hideLayout();
-        if(mComicListDetail!=null){
+        if (mComicListDetail != null) {
             setToolBar(mToolbar, mComicListDetail.getName(), true);
             showInfo(mComicListDetail);
             request(index);
@@ -398,7 +399,7 @@ private void initModule(int module) {
         } else {
             linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
             mRvList.setLayoutManager(linearLayoutManager);
-            mPagerSnapHelper = new PagerSnapHelper();
+            mPagerSnapHelper = new MyPagerSnapHelper(linearLayoutManager.getExtraSpace());
             mPagerSnapHelper.attachToRecyclerView(mRvList);
         }
         mPreviewAdapter = null;
@@ -452,7 +453,7 @@ public void onBackPressed() {
     @Override
     public void finish() {
         //更新当前数据库记录
-        if(mComicListDetail!=null&&firstVisibleItem!=null){
+        if (mComicListDetail != null && firstVisibleItem != null) {
             mRecordDao.updateRecord(
                     mComicListDetail.getId(),
                     firstVisibleItem.getName()

diff --git a/app/src/main/java/com/lai/mtc/mvp/ui/comics/adapter/PreviewAdapter.java b/app/src/main/java/com/lai/mtc/mvp/ui/comics/adapter/PreviewAdapter.java
@@ -7,6 +7,7 @@
 import android.util.SparseArray;
 import android.view.ViewGroup;
 import android.widget.ImageView;
+import android.widget.RelativeLayout;
 
 import com.bumptech.glide.GenericTransitionOptions;
 import com.bumptech.glide.load.DataSource;
@@ -19,6 +20,7 @@
 import com.lai.mtc.bean.ComicPreView;
 import com.lai.mtc.comm.CommonAdapter;
 import com.lai.mtc.mvp.utlis.SPUtils;
+import com.lai.mtc.mvp.utlis.ScreenUtils;
 import com.lai.mtc.mvp.utlis.glide.GlideApp;
 import com.lai.mtc.mvp.utlis.glide.GlideRequest;
 
@@ -32,8 +34,6 @@
 
 public class PreviewAdapter extends CommonAdapter<ComicPreView.PagesBean> {
 
-    //记录上一次的位置。防止再次计算
-    private int lastPosition;
     //预览模式
     private int module;
 
@@ -73,30 +73,37 @@ protected void convert(BaseViewHolder baseViewHolder, ComicPreView.PagesBean pag
                 .placeholder(new ColorDrawable(Color.BLACK))
                 .diskCacheStrategy(DiskCacheStrategy.ALL)
                 .transition(new GenericTransitionOptions<Bitmap>());
-        //避免重新计算
-        if (module == 0 && lastPosition <= position) {
-            lastPosition = position;
+        if (module == 0) {
             RequestListener<Bitmap> requestListener = new RequestListener<Bitmap>() {
                 @Override
                 public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Bitmap> target, boolean isFirstResource) {
                     return false;
                 }
 
                 @Override
-                public boolean onResourceReady(Bitmap resource, Object model, Target<Bitmap> target, DataSource dataSource, boolean isFirstResource) {
+                public boolean onResourceReady(Bitmap bitmap, Object model, Target<Bitmap> target, DataSource dataSource, boolean isFirstResource) {
                     if (imageView == null) {
                         return false;
                     }
-                    //FIXME: 固定宽。高度的比例自适应进行缩放.可能照成OOM.后期得想办法
+
                     if (imageView.getScaleType() != ImageView.ScaleType.FIT_XY) {
                         imageView.setScaleType(ImageView.ScaleType.FIT_XY);
                     }
-                    ViewGroup.LayoutParams params = imageView.getLayoutParams();
+                  /*  ViewGroup.LayoutParams params = imageView.getLayoutParams();
                     int vw = imageView.getWidth() - imageView.getPaddingLeft() - imageView.getPaddingRight();
                     float scale = (float) vw / (float) resource.getWidth();
                     int vh = Math.round(resource.getHeight() * scale);
                     params.height = vh + imageView.getPaddingTop() + imageView.getPaddingBottom();
-                    imageView.setLayoutParams(params);
+                    imageView.setLayoutParams(params);*/
+
+                    int width = bitmap.getWidth();
+                    int height = bitmap.getHeight();
+                    float scale = ((float) height) / width;
+                    ViewGroup.LayoutParams layoutParams = imageView.getLayoutParams();
+                    layoutParams.width = ScreenUtils.getScreenWidth(mContext);
+                    layoutParams.height = (int) (scale * ScreenUtils.getScreenWidth(mContext));
+                    imageView.setLayoutParams(layoutParams);
+
                     return false;
                 }
             };

diff --git a/app/src/main/java/com/lai/mtc/mvp/utlis/ScreenUtils.java b/app/src/main/java/com/lai/mtc/mvp/utlis/ScreenUtils.java
@@ -44,6 +44,28 @@ public static int getScreenWidth() {
         return point.x;
     }
 
+    /**
+     * 获得屏幕高度
+     *
+     * @param context
+     * @return
+     */
+    public static int getScreenHeight(Context context)
+    {
+        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
+        DisplayMetrics outMetrics = new DisplayMetrics();
+        wm.getDefaultDisplay().getMetrics(outMetrics);
+        return outMetrics.heightPixels;
+    }
+
+    public static int getScreenWidth(Context context)
+    {
+        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
+        DisplayMetrics outMetrics = new DisplayMetrics();
+        wm.getDefaultDisplay().getMetrics(outMetrics);
+        return outMetrics.widthPixels;
+    }
+
     /**
      * 获取屏幕的高度（单位：px）
      *