Android瀑布流

发布时间:2017-6-25 3:07:16 编辑:www.fx114.net 分享查询网我要评论
本篇文章主要介绍了"Android瀑布流",主要涉及到Android瀑布流方面的内容,对于Android瀑布流感兴趣的同学可以参考一下。

应朋友之邀,临时改个demo,大体就这个样子,图片上层想加什么加什么,加载的是本地图片,不是网络的,但也可以拿来参考。因为不是本人现在项目用到的,改完了就不深究了,还有更重要的要忙。 关键代码: package com.dodowaterfall; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.List; import android.app.Activity; import android.content.Context; import android.content.Intent; 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.View.OnClickListener; import android.view.ViewGroup.LayoutParams; import android.widget.LinearLayout; import com.dodowaterfall.LazyScrollView.OnScrollListener; import com.dodowaterfall.widget.FlowTag; import com.dodowaterfall.widget.FlowView; import com.dodowaterfall.widget.ImageLoaderTask; 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 = 3;// 显示列数 private int page_count = 6;// 每次加载15张图片 private int current_page = 0;// 当前页数 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(); 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 handleMessage(Message msg) { switch (msg.what) { case 1: 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; 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) { View v= LayoutInflater.from(this).inflate(R.layout.waterfallitem, null); /* FlowView item = (FlowView) LayoutInflater.from(this).inflate( R.layout.waterfallitem, null);*/ FlowView item= (FlowView)v.findViewById(R.id.waterfall_image); 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); waterfall_items.get(columnIndex).addView(v); ImageLoaderTask task = new ImageLoaderTask(item); item.setTag(filename); item.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(); intent.setClass(MainActivity.this, sActivity.class); Bundle b = new Bundle(); b.putString("fileName", (String) v.getTag()); intent.putExtras(b); startActivity(intent); } }); task.execute(param); } 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; } } package com.dodowaterfall.widget; import java.io.BufferedInputStream; import java.io.IOException; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.AnimationDrawable; import android.widget.ImageView; import android.widget.ScrollView; import android.widget.Toast; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.util.Log; import android.view.View; import android.view.ViewGroup.LayoutParams; public class FlowView extends ImageView implements View.OnClickListener, View.OnLongClickListener { private AnimationDrawable loadingAnimation; private FlowTag flowTag; private Context context; public Bitmap bitmap; private ImageLoaderTask task; private int columnIndex;// 图片属于第几列 private int rowIndex;// 图片属于第几行 private Handler viewHandler; public FlowView(Context c, AttributeSet attrs, int defStyle) { super(c, attrs, defStyle); this.context = c; Init(); } public FlowView(Context c, AttributeSet attrs) { super(c, attrs); this.context = c; Init(); } public FlowView(Context c) { super(c); this.context = c; Init(); } private void Init() { setOnClickListener(this); this.setOnLongClickListener(this); setAdjustViewBounds(true); } @Override public boolean onLongClick(View v) { Log.d("FlowView", "LongClick"); Toast.makeText(context, "长按:" + this.flowTag.getFlowId(), Toast.LENGTH_SHORT).show(); return true; } @Override public void onClick(View v) { Log.d("FlowView", "Click"); Toast.makeText(context, "单击:" + this.flowTag.getFlowId(), Toast.LENGTH_SHORT).show(); } /** * 加载图片 */ public void LoadImage() { if (getFlowTag() != null) { new LoadImageThread().start(); } } /** * 重新加载图片 */ public void Reload() { if (this.bitmap == null && getFlowTag() != null) { new LoadImageThread().start(); } } /** * 回收内存 */ public void recycle() { setImageBitmap(null); if ((this.bitmap == null) || (this.bitmap.isRecycled())) return; this.bitmap.recycle(); this.bitmap = null; } public FlowTag getFlowTag() { return flowTag; } public void setFlowTag(FlowTag flowTag) { this.flowTag = flowTag; } public int getColumnIndex() { return columnIndex; } public void setColumnIndex(int columnIndex) { this.columnIndex = columnIndex; } public int getRowIndex() { return rowIndex; } public void setRowIndex(int rowIndex) { this.rowIndex = rowIndex; } public Handler getViewHandler() { return viewHandler; } public FlowView setViewHandler(Handler viewHandler) { this.viewHandler = viewHandler; return this; } class LoadImageThread extends Thread { LoadImageThread() { } public void run() { if (flowTag != null) { BufferedInputStream buf; try { buf = new BufferedInputStream(flowTag.getAssetManager() .open(flowTag.getFileName())); bitmap = BitmapFactory.decodeStream(buf); } catch (IOException e) { e.printStackTrace(); } // 此处不能直接更新UI,否则会发生异常: // CalledFromWrongThreadException: Only the original thread that // created a view hierarchy can touch its views. // 也可以使用Handler或者Looper发送Message解决这个问题 ((Activity) context).runOnUiThread(new Runnable() { public void run() { if (bitmap != null){// 此处在线程过多时可能为null int width = bitmap.getWidth();// 获取真实宽高 int height = bitmap.getHeight(); LayoutParams lp = getLayoutParams(); lp.height = (height * flowTag.getItemWidth()) / width;// 调整高度 setLayoutParams(lp); setImageBitmap(bitmap);// 将引用指定到同一个对象,方便销毁 Handler h = getViewHandler(); Message m = h.obtainMessage(flowTag.what, width, height, FlowView.this); h.sendMessage(m); } } }); } } } } 源码:http://download.csdn.net/detail/djun100/6023043

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