Android应用源码瀑布流实现，类似 于蘑菇街和迷尚 应用里的排列-IT计算机-毕业设计.zip

package com.dodowaterfall; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.List; import com.dodowaterfall.LazyScrollView.OnScrollListener; import com.dodowaterfall.widget.FlowTag; import com.dodowaterfall.widget.FlowView; import android.app.Activity; import android.content.Context; import android.content.res.AssetManager; import android.graphics.Rect; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.Display; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.widget.LinearLayout; import android.widget.ScrollView; import android.widget.Toast; public class MainActivity extends Activity { private LazyScrollView waterfall_scroll; private LinearLayout waterfall_container; private ArrayList<LinearLayout> waterfall_items; private Display display; private AssetManager asset_manager; private List<String> image_filenames; private final String image_path = "images"; private Handler handler; private int item_width; private int column_count = 4;// 显示列数 private int page_count = 15;// 每次加载15张图片 private int current_page = 0;// 当前页数 private int[] topIndex;// 待用 private int[] bottomIndex;// 待用 private int[] column_height;// 每列的高度 private HashMap<Integer, String> pins; private int loaded_count = 0;// 已加载数量 private HashMap<Integer, Integer>[] pin_mark = null; private Context context; private HashMap<Integer, FlowView> iviews; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); display = this.getWindowManager().getDefaultDisplay(); item_width = display.getWidth() / column_count;// 根据屏幕大小计算每列大小 asset_manager = this.getAssets(); topIndex = new int[column_count]; bottomIndex = new int[column_count]; column_height = new int[column_count]; context = this.getApplicationContext(); iviews = new HashMap<Integer, FlowView>(); pins = new HashMap<Integer, String>(); pin_mark = new HashMap[column_count]; InitLayout(); } private void InitLayout() { waterfall_scroll = (LazyScrollView) findViewById(R.id.waterfall_scroll); waterfall_scroll.getView(); waterfall_scroll.setOnScrollListener(new OnScrollListener() { @Override public void onTop() { // 滚动到最顶端 Log.d("LazyScroll", "Scroll to top"); } @Override public void onScroll() { } @Override public void onBottom() { // 滚动到最低端 AddItemToContainer(++current_page, page_count); } @Override public void onAutoScroll() { // 暂时解决,需重写 // 自动滚动 Rect bounds = new Rect(); Rect scrollBounds = new Rect(waterfall_scroll.getScrollX(), waterfall_scroll.getScrollY(), waterfall_scroll .getScrollX() + waterfall_scroll.getWidth(), waterfall_scroll.getScrollY() + waterfall_scroll.getHeight()); for (int i = 1; i < loaded_count; i++) { FlowView v = iviews.get(i); if (v != null) { v.getHitRect(bounds); if (Rect.intersects(scrollBounds, bounds)) { if (v.bitmap == null) { v.Reload(); } } else { v.recycle(); } } } } }); waterfall_container = (LinearLayout) this .findViewById(R.id.waterfall_container); handler = new Handler() { @Override public void dispatchMessage(Message msg) { super.dispatchMessage(msg); } @Override public void handleMessage(Message msg) { // super.handleMessage(msg); switch (msg.what) { case 1: // Toast.makeText(context, ((FlowView) msg.obj).getHeight(), // Toast.LENGTH_SHORT).show(); FlowView v = (FlowView) msg.obj; int w = msg.arg1; int h = msg.arg2; Log.d("MainActivity", String.format( "获取实际View高度:%d,ID：%d,columnIndex:%d,rowIndex:%d,filename:%s", v.getHeight(), v.getId(), v .getColumnIndex(), v.getRowIndex(), v.getFlowTag().getFileName())); String f = v.getFlowTag().getFileName(); // 此处计算列值 int columnIndex = GetMinValue(column_height); v.setColumnIndex(columnIndex); column_height[columnIndex] += h; pins.put(v.getId(), f); iviews.put(v.getId(), v); break; } } @Override public boolean sendMessageAtTime(Message msg, long uptimeMillis) { return super.sendMessageAtTime(msg, uptimeMillis); } }; waterfall_items = new ArrayList<LinearLayout>(); for (int i = 0; i < column_count; i++) { LinearLayout itemLayout = new LinearLayout(this); LinearLayout.LayoutParams itemParam = new LinearLayout.LayoutParams( item_width, LayoutParams.WRAP_CONTENT); itemLayout.setPadding(2, 2, 2, 2); itemLayout.setOrientation(LinearLayout.VERTICAL); itemLayout.setLayoutParams(itemParam); waterfall_items.add(itemLayout); waterfall_container.addView(itemLayout); } // 加载所有图片路径 try { image_filenames = Arrays.asList(asset_manager.list(image_path)); } catch (IOException e) { e.printStackTrace(); } // 第一次加载 AddItemToContainer(current_page, page_count); } private void AddItemToContainer(int pageindex, int pagecount) { int currentIndex = pageindex * pagecount; // 将废弃：按照顺序排列图片，发现问题，如果图片不均匀则会出现有的列过长有的列短的情况 // 将采用根据高度最小的那列添加图片的方式 int j = currentIndex % column_count; int imagecount = image_filenames.size(); for (int i = currentIndex; i < pagecount * (pageindex + 1) && i < imagecount; i++) { loaded_count++; j = j >= column_count ? j = 0 : j; // j = GetMinValue(column_height); AddImage(image_filenames.get(i), j++, (int) Math.ceil(loaded_count / (double) column_count), loaded_count); } } private void AddImage(String filename, int columnIndex, int rowIndex, int id) { FlowView item = (FlowView) LayoutInflater.from(this).inflate( R.layout.waterfallitem, null); item.setColumnIndex(columnIndex); item.setRowIndex(rowIndex); item.setId(id); item.setViewHandler(this.handler); // 多线程参数 FlowTag param = new FlowTag(); param.setFlowId(id); param.setAssetManager(asset_manager); param.setFileName(image_path + "/" + filename); param.setItemWidth(item_width); item.setFlowTag(param); item.LoadImage(); waterfall_items.get(columnIndex).addView(item); } private int GetMinValue(int[] array) { int m = 0; int length = array.length; for (int i = 0; i < length; ++i) { if (array[i] < array[m]) { m = i; } } return m; } }