當前位置：首頁 > 编程资源 > 编程问答 >内容正文

编程问答

新闻阅读器频道管理

發布時間：2025/4/16 编程问答 17 豆豆

生活随笔收集整理的這篇文章主要介紹了新闻阅读器频道管理小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

原文鏈接：http://blog.csdn.net/vipzjyno1/article/details/25005851

本例子實現的功能是很多新聞閱讀器（網易，今日頭條，360新聞等）以及騰訊視頻等里面都會出現的頻道管理功能,點擊可以增刪頻道，長按拖拽排序。下面的效果圖沒有拖拽的時候的移動動畫，DEMO里面有，可以下載看看
實現思路：

獲取數據庫中頻道的列表，如果為空，賦予默認列表，并存入數據庫，之后通過對應的適配器賦給對應的GridView
2個GridView–（1.DragGrid 2. OtherGridView）
DragGrid 用于顯示我的頻道，帶有長按拖拽效果
OtherGridView用于顯示更多頻道，不帶推拽效果
注：由于屏幕大小不一定，外層使用ScrollView，所以2者都要重寫計算高度
點擊2個GridView的時候，根據點擊的Item對應的position，獲取position對應的view，進行創建一層移動的動畫層
起始位置：點擊的positiongetLocationInWindow（）獲取。終點位置：另一個GridView的最后個ITEM 的position + 1的位置。
并賦予移動動畫，等動畫結束后對2者對應的頻道列表進行數據的remove和add操作。
設置點擊和拖動的限制條件，如推薦這個ITEM是不允許用戶操作的。
拖動的DragGrid的操作：

1、長按獲取長按的ITEM的position — dragPosition 以及對應的view ，手指觸摸屏幕的時候，調用onInterceptTouchEvent來獲取MotionEvent.ACTION_DOWN事件，獲取對應的數據。由于這里是繼承了GridView，所以長按時間可以通過setOnItemLongClickListener監聽來執行，或則你也可以通過計算點擊時間來監聽是否長按。

2、通過onTouchEvent(MotionEvent ev)來監聽手指的移動和抬起動作。當它移動到其它的item下面，并且下方的item對應的position 不等于 dragPosition，進行數據交換，并且2者之間的所有item進行移動動畫，動畫結束后，數據更替刷新界面。

3、抬起手后，清除掉拖動時候創建的view，讓GridView中的數據顯示。

退出時候，將改變后的頻道列表存入數據庫

DragGrid

public class DragGrid extends GridView {/** 點擊時候的X位置 */public int downX;/** 點擊時候的Y位置 */public int downY;/** 點擊時候對應整個界面的X位置 */public int windowX;/** 點擊時候對應整個界面的Y位置 */public int windowY;/** 屏幕上的X */private int win_view_x;/** 屏幕上的Y*/private int win_view_y;/** 拖動的里x的距離 */int dragOffsetX;/** 拖動的里Y的距離 */int dragOffsetY;/** 長按時候對應postion */public int dragPosition;/** Up后對應的ITEM的Position */private int dropPosition;/** 開始拖動的ITEM的Position*/private int startPosition;/** item高 */private int itemHeight;/** item寬 */private int itemWidth;/** 拖動的時候對應ITEM的VIEW */private View dragImageView = null;/** 長按的時候ITEM的VIEW*/private ViewGroup dragItemView = null;/** WindowManager管理器 */private WindowManager windowManager = null;/** */private WindowManager.LayoutParams windowParams = null;/** item總量*/private int itemTotalCount;/** 一行的ITEM數量*/private int nColumns = 4;/** 行數 */private int nRows;/** 剩余部分 */private int Remainder;/** 是否在移動 */private boolean isMoving = false;/** */private int holdPosition;/** 拖動的時候放大的倍數 */private double dragScale = 1.2D;/** 震動器 */private Vibrator mVibrator;/** 每個ITEM之間的水平間距 */private int mHorizontalSpacing = 15;/** 每個ITEM之間的豎直間距 */private int mVerticalSpacing = 15;/* 移動時候最后個動畫的ID */private String LastAnimationID;public DragGrid(Context context) {super(context);init(context);}public DragGrid(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init(context);}public DragGrid(Context context, AttributeSet attrs) {super(context, attrs);init(context);}public void init(Context context){mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);//將布局文件中設置的間距dip轉為pxmHorizontalSpacing = DataTools.dip2px(context, mHorizontalSpacing);}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {// TODO Auto-generated method stubif (ev.getAction() == MotionEvent.ACTION_DOWN) {downX = (int) ev.getX();downY = (int) ev.getY();windowX = (int) ev.getX();windowY = (int) ev.getY();setOnItemClickListener(ev);}return super.onInterceptTouchEvent(ev);}@Overridepublic boolean onTouchEvent(MotionEvent ev) {// TODO Auto-generated method stubboolean bool = true;if (dragImageView != null && dragPosition != AdapterView.INVALID_POSITION) {// 移動時候的對應x,y位置bool = super.onTouchEvent(ev);int x = (int) ev.getX();int y = (int) ev.getY();switch (ev.getAction()) {case MotionEvent.ACTION_DOWN:downX = (int) ev.getX();windowX = (int) ev.getX();downY = (int) ev.getY();windowY = (int) ev.getY();break;case MotionEvent.ACTION_MOVE:onDrag(x, y ,(int) ev.getRawX() , (int) ev.getRawY());if (!isMoving){OnMove(x, y);}if (pointToPosition(x, y) != AdapterView.INVALID_POSITION){break;}break;case MotionEvent.ACTION_UP:stopDrag();onDrop(x, y);requestDisallowInterceptTouchEvent(false);break;default:break;}}return super.onTouchEvent(ev);}/** 在拖動的情況 */private void onDrag(int x, int y , int rawx , int rawy) {if (dragImageView != null) {windowParams.alpha = 0.6f; // windowParams.x = rawx - itemWidth / 2; // windowParams.y = rawy - itemHeight / 2;windowParams.x = rawx - win_view_x;windowParams.y = rawy - win_view_y;windowManager.updateViewLayout(dragImageView, windowParams);}}/** 在松手下放的情況 */private void onDrop(int x, int y) {// 根據拖動到的x,y坐標獲取拖動位置下方的ITEM對應的POSTIONint tempPostion = pointToPosition(x, y); // if (tempPostion != AdapterView.INVALID_POSITION) {dropPosition = tempPostion;DragAdapter mDragAdapter = (DragAdapter) getAdapter();//顯示剛拖動的ITEMmDragAdapter.setShowDropItem(true);//刷新適配器，讓對應的ITEM顯示mDragAdapter.notifyDataSetChanged(); // }}/*** 長按點擊監聽* @param ev*/public void setOnItemClickListener(final MotionEvent ev) {setOnItemLongClickListener(new OnItemLongClickListener() {@Overridepublic boolean onItemLongClick(AdapterView<?> parent, View view,int position, long id) {int x = (int) ev.getX();// 長安事件的X位置int y = (int) ev.getY();// 長安事件的y位置startPosition = position;// 第一次點擊的postiondragPosition = position;if (startPosition <= 1) {return false;}ViewGroup dragViewGroup = (ViewGroup) getChildAt(dragPosition - getFirstVisiblePosition());TextView dragTextView = (TextView)dragViewGroup.findViewById(R.id.text_item);dragTextView.setSelected(true);dragTextView.setEnabled(false);itemHeight = dragViewGroup.getHeight();itemWidth = dragViewGroup.getWidth();itemTotalCount = DragGrid.this.getCount();int row = itemTotalCount / nColumns;// 算出行數Remainder = (itemTotalCount % nColumns);// 算出最后一行多余的數量if (Remainder != 0) {nRows = row + 1;} else {nRows = row;}// 如果特殊的這個不等于拖動的那個,并且不等于-1if (dragPosition != AdapterView.INVALID_POSITION) {// 釋放的資源使用的繪圖緩存。如果你調用buildDrawingCache()手動沒有調用setDrawingCacheEnabled(真正的),你應該清理緩存使用這種方法。win_view_x = windowX - dragViewGroup.getLeft();//VIEW相對自己的X，半斤win_view_y = windowY - dragViewGroup.getTop();//VIEW相對自己的y，半斤dragOffsetX = (int) (ev.getRawX() - x);//手指在屏幕的上X位置-手指在控件中的位置就是距離最左邊的距離dragOffsetY = (int) (ev.getRawY() - y);//手指在屏幕的上y位置-手指在控件中的位置就是距離最上邊的距離dragItemView = dragViewGroup;dragViewGroup.destroyDrawingCache();dragViewGroup.setDrawingCacheEnabled(true);Bitmap dragBitmap = Bitmap.createBitmap(dragViewGroup.getDrawingCache());mVibrator.vibrate(50);//設置震動時間startDrag(dragBitmap, (int)ev.getRawX(), (int)ev.getRawY());hideDropItem();dragViewGroup.setVisibility(View.INVISIBLE);isMoving = false;requestDisallowInterceptTouchEvent(true);return true;}return false;}});}public void startDrag(Bitmap dragBitmap, int x, int y) {stopDrag();windowParams = new WindowManager.LayoutParams();// 獲取WINDOW界面的//Gravity.TOP|Gravity.LEFT;這個必須加 windowParams.gravity = Gravity.TOP | Gravity.LEFT; // windowParams.x = x - (int)((itemWidth / 2) * dragScale); // windowParams.y = y - (int) ((itemHeight / 2) * dragScale);//得到preview左上角相對于屏幕的坐標 windowParams.x = x - win_view_x;windowParams.y = y - win_view_y; // this.windowParams.x = (x - this.win_view_x + this.viewX);//位置的x值 // this.windowParams.y = (y - this.win_view_y + this.viewY);//位置的y值//設置拖拽item的寬和高 windowParams.width = (int) (dragScale * dragBitmap.getWidth());// 放大dragScale倍，可以設置拖動后的倍數windowParams.height = (int) (dragScale * dragBitmap.getHeight());// 放大dragScale倍，可以設置拖動后的倍數this.windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;this.windowParams.format = PixelFormat.TRANSLUCENT;this.windowParams.windowAnimations = 0;ImageView iv = new ImageView(getContext());iv.setImageBitmap(dragBitmap);windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);// "window"windowManager.addView(iv, windowParams);dragImageView = iv;}/** 停止拖動，釋放并初始化 */private void stopDrag() {if (dragImageView != null) {windowManager.removeView(dragImageView);dragImageView = null;}}/** 在ScrollView內，所以要進行計算高度 */@Overridepublic void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST);super.onMeasure(widthMeasureSpec, expandSpec);}/** 隱藏放下的ITEM*/private void hideDropItem() {((DragAdapter) getAdapter()).setShowDropItem(false);}/** 獲取移動動畫 */public Animation getMoveAnimation(float toXValue, float toYValue) {TranslateAnimation mTranslateAnimation = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0F,Animation.RELATIVE_TO_SELF,toXValue, Animation.RELATIVE_TO_SELF, 0.0F,Animation.RELATIVE_TO_SELF, toYValue);// 當前位置移動到指定位置mTranslateAnimation.setFillAfter(true);// 設置一個動畫效果執行完畢后，View對象保留在終止的位置。mTranslateAnimation.setDuration(300L);return mTranslateAnimation;}/** 移動的時候觸發*/public void OnMove(int x, int y) {// 拖動的VIEW下方的POSTIONint dPosition = pointToPosition(x, y);// 判斷下方的POSTION是否是最開始2個不能拖動的if (dPosition > 1) {if ((dPosition == -1) || (dPosition == dragPosition)){return;}dropPosition = dPosition;if (dragPosition != startPosition){dragPosition = startPosition;}int movecount;//拖動的=開始拖的，并且拖動的不等于放下的if ((dragPosition == startPosition) || (dragPosition != dropPosition)){//移需要移動的動ITEM數量movecount = dropPosition - dragPosition;}else{//移需要移動的動ITEM數量為0movecount = 0;}if(movecount == 0){return;}int movecount_abs = Math.abs(movecount);if (dPosition != dragPosition) {//dragGroup設置為不可見ViewGroup dragGroup = (ViewGroup) getChildAt(dragPosition);dragGroup.setVisibility(View.INVISIBLE);float to_x = 1;// 當前下方positonfloat to_y;// 當前下方右邊positon//x_vlaue移動的距離百分比（相對于自己長度的百分比）float x_vlaue = ((float) mHorizontalSpacing / (float) itemWidth) + 1.0f;//y_vlaue移動的距離百分比（相對于自己寬度的百分比）float y_vlaue = ((float) mVerticalSpacing / (float) itemHeight) + 1.0f;Log.d("x_vlaue", "x_vlaue = " + x_vlaue);for (int i = 0; i < movecount_abs; i++) {to_x = x_vlaue;to_y = y_vlaue;//像左if (movecount > 0) {// 判斷是不是同一行的holdPosition = dragPosition + i + 1;if (dragPosition / nColumns == holdPosition / nColumns) {to_x = - x_vlaue;to_y = 0;} else if (holdPosition % 4 == 0) {to_x = 3 * x_vlaue;to_y = - y_vlaue;} else {to_x = - x_vlaue;to_y = 0;}}else{//向右,下移到上，右移到左holdPosition = dragPosition - i - 1;if (dragPosition / nColumns == holdPosition / nColumns) {to_x = x_vlaue;to_y = 0;} else if((holdPosition + 1) % 4 == 0){to_x = -3 * x_vlaue;to_y = y_vlaue;}else{to_x = x_vlaue;to_y = 0;}}ViewGroup moveViewGroup = (ViewGroup) getChildAt(holdPosition);Animation moveAnimation = getMoveAnimation(to_x, to_y);moveViewGroup.startAnimation(moveAnimation);//如果是最后一個移動的，那么設置他的最后個動畫ID為LastAnimationIDif (holdPosition == dropPosition) {LastAnimationID = moveAnimation.toString();}moveAnimation.setAnimationListener(new AnimationListener() {@Overridepublic void onAnimationStart(Animation animation) {// TODO Auto-generated method stubisMoving = true;}@Overridepublic void onAnimationRepeat(Animation animation) {// TODO Auto-generated method stub}@Overridepublic void onAnimationEnd(Animation animation) {// TODO Auto-generated method stub// 如果為最后個動畫結束，那執行下面的方法if (animation.toString().equalsIgnoreCase(LastAnimationID)) {DragAdapter mDragAdapter = (DragAdapter) getAdapter();mDragAdapter.exchange(startPosition,dropPosition);startPosition = dropPosition;dragPosition = dropPosition;isMoving = false;}}});}}}} }

OtherGridView

public class OtherGridView extends GridView {public OtherGridView(Context paramContext, AttributeSet paramAttributeSet) {super(paramContext, paramAttributeSet);}@Overridepublic void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST);super.onMeasure(widthMeasureSpec, expandSpec);} }

ChannelActivity

public class ChannelActivity extends Activity implements OnItemClickListener {/** 用戶欄目的GRIDVIEW */private DragGrid userGridView;/** 其它欄目的GRIDVIEW */private OtherGridView otherGridView;/** 用戶欄目對應的適配器，可以拖動 */DragAdapter userAdapter;/** 其它欄目對應的適配器 */OtherAdapter otherAdapter;/** 其它欄目列表 */ArrayList<ChannelItem> otherChannelList = new ArrayList<ChannelItem>();/** 用戶欄目列表 */ArrayList<ChannelItem> userChannelList = new ArrayList<ChannelItem>();/** 是否在移動，由于這邊是動畫結束后才進行的數據更替，設置這個限制為了避免操作太頻繁造成的數據錯亂。 */ boolean isMove = false;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.subscribe_activity);initView();initData();}/** 初始化數據*/private void initData() {userChannelList = ((ArrayList<ChannelItem>)ChannelManage.getManage(AppApplication.getApp().getSQLHelper()).getUserChannel());otherChannelList = ((ArrayList<ChannelItem>)ChannelManage.getManage(AppApplication.getApp().getSQLHelper()).getOtherChannel());userAdapter = new DragAdapter(this, userChannelList);userGridView.setAdapter(userAdapter);otherAdapter = new OtherAdapter(this, otherChannelList);otherGridView.setAdapter(this.otherAdapter);//設置GRIDVIEW的ITEM的點擊監聽otherGridView.setOnItemClickListener(this);userGridView.setOnItemClickListener(this);}/** 初始化布局*/private void initView() {userGridView = (DragGrid) findViewById(R.id.userGridView);otherGridView = (OtherGridView) findViewById(R.id.otherGridView);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}/** GRIDVIEW對應的ITEM點擊監聽接口 */@Overridepublic void onItemClick(AdapterView<?> parent, final View view, final int position,long id) {//如果點擊的時候，之前動畫還沒結束，那么就讓點擊事件無效if(isMove){return;}switch (parent.getId()) {case R.id.userGridView://position為 0，1 的不可以進行任何操作if (position != 0 && position != 1) {final ImageView moveImageView = getView(view);if (moveImageView != null) {TextView newTextView = (TextView) view.findViewById(R.id.text_item);final int[] startLocation = new int[2];newTextView.getLocationInWindow(startLocation);final ChannelItem channel = ((DragAdapter) parent.getAdapter()).getItem(position);//獲取點擊的頻道內容otherAdapter.setVisible(false);//添加到最后一個otherAdapter.addItem(channel);new Handler().postDelayed(new Runnable() {public void run() {try {int[] endLocation = new int[2];//獲取終點的坐標otherGridView.getChildAt(otherGridView.getLastVisiblePosition()).getLocationInWindow(endLocation);MoveAnim(moveImageView, startLocation , endLocation, channel,userGridView);userAdapter.setRemove(position);} catch (Exception localException) {}}}, 50L);}}break;case R.id.otherGridView:final ImageView moveImageView = getView(view);if (moveImageView != null){TextView newTextView = (TextView) view.findViewById(R.id.text_item);final int[] startLocation = new int[2];newTextView.getLocationInWindow(startLocation);final ChannelItem channel = ((OtherAdapter) parent.getAdapter()).getItem(position);userAdapter.setVisible(false);//添加到最后一個userAdapter.addItem(channel);new Handler().postDelayed(new Runnable() {public void run() {try {int[] endLocation = new int[2];//獲取終點的坐標userGridView.getChildAt(userGridView.getLastVisiblePosition()).getLocationInWindow(endLocation);MoveAnim(moveImageView, startLocation , endLocation, channel,otherGridView);otherAdapter.setRemove(position);} catch (Exception localException) {}}}, 50L);}break;default:break;}}/*** 點擊ITEM移動動畫* @param moveView* @param startLocation* @param endLocation* @param moveChannel* @param clickGridView*/private void MoveAnim(View moveView, int[] startLocation,int[] endLocation, final ChannelItem moveChannel,final GridView clickGridView) {int[] initLocation = new int[2];//獲取傳遞過來的VIEW的坐標moveView.getLocationInWindow(initLocation);//得到要移動的VIEW,并放入對應的容器中final ViewGroup moveViewGroup = getMoveViewGroup();final View mMoveView = getMoveView(moveViewGroup, moveView, initLocation);//創建移動動畫TranslateAnimation moveAnimation = new TranslateAnimation(startLocation[0], endLocation[0], startLocation[1],endLocation[1]);moveAnimation.setDuration(300L);//動畫時間//動畫配置AnimationSet moveAnimationSet = new AnimationSet(true);moveAnimationSet.setFillAfter(false);//動畫效果執行完畢后，View對象不保留在終止的位置moveAnimationSet.addAnimation(moveAnimation);mMoveView.startAnimation(moveAnimationSet);moveAnimationSet.setAnimationListener(new AnimationListener() {@Overridepublic void onAnimationStart(Animation animation) {isMove = true;}@Overridepublic void onAnimationRepeat(Animation animation) {}@Overridepublic void onAnimationEnd(Animation animation) {moveViewGroup.removeView(mMoveView);// instanceof 方法判斷2邊實例是不是一樣，判斷點擊的是DragGrid還是OtherGridViewif (clickGridView instanceof DragGrid) {otherAdapter.setVisible(true);otherAdapter.notifyDataSetChanged();userAdapter.remove();}else{userAdapter.setVisible(true);userAdapter.notifyDataSetChanged();otherAdapter.remove();}isMove = false;}});}/*** 獲取移動的VIEW，放入對應ViewGroup布局容器* @param viewGroup* @param view* @param initLocation* @return*/private View getMoveView(ViewGroup viewGroup, View view, int[] initLocation) {int x = initLocation[0];int y = initLocation[1];viewGroup.addView(view);LinearLayout.LayoutParams mLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);mLayoutParams.leftMargin = x;mLayoutParams.topMargin = y;view.setLayoutParams(mLayoutParams);return view;}/*** 創建移動的ITEM對應的ViewGroup布局容器*/private ViewGroup getMoveViewGroup() {ViewGroup moveViewGroup = (ViewGroup) getWindow().getDecorView();LinearLayout moveLinearLayout = new LinearLayout(this);moveLinearLayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));moveViewGroup.addView(moveLinearLayout);return moveLinearLayout;}/*** 獲取點擊的Item的對應View，* @param view* @return*/private ImageView getView(View view) {view.destroyDrawingCache();view.setDrawingCacheEnabled(true);Bitmap cache = Bitmap.createBitmap(view.getDrawingCache());view.setDrawingCacheEnabled(false);ImageView iv = new ImageView(this);iv.setImageBitmap(cache);return iv;}/** 退出時候保存選擇后數據庫的設置 */private void saveChannel() {ChannelManage.getManage(AppApplication.getApp().getSQLHelper()).deleteAllChannel();ChannelManage.getManage(AppApplication.getApp().getSQLHelper()).saveUserChannel(userAdapter.getChannnelLst());ChannelManage.getManage(AppApplication.getApp().getSQLHelper()).saveOtherChannel(otherAdapter.getChannnelLst());}@Overridepublic void onBackPressed() {saveChannel();super.onBackPressed();} }

DragAdapter

public class DragAdapter extends BaseAdapter {/** TAG*/private final static String TAG = "DragAdapter";/** 是否顯示底部的ITEM */private boolean isItemShow = false;private Context context;/** 控制的postion */private int holdPosition;/** 是否改變 */private boolean isChanged = false;/** 是否可見 */boolean isVisible = true;/** 可以拖動的列表（即用戶選擇的頻道列表） */public List<ChannelItem> channelList;/** TextView 頻道內容 */private TextView item_text;/** 要刪除的position */public int remove_position = -1;public DragAdapter(Context context, List<ChannelItem> channelList) {this.context = context;this.channelList = channelList;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn channelList == null ? 0 : channelList.size();}@Overridepublic ChannelItem getItem(int position) {// TODO Auto-generated method stubif (channelList != null && channelList.size() != 0) {return channelList.get(position);}return null;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view = LayoutInflater.from(context).inflate(R.layout.subscribe_category_item, null);item_text = (TextView) view.findViewById(R.id.text_item);ChannelItem channel = getItem(position);item_text.setText(channel.getName());if ((position == 0) || (position == 1)){ // item_text.setTextColor(context.getResources().getColor(R.color.black));item_text.setEnabled(false);}if (isChanged && (position == holdPosition) && !isItemShow) {item_text.setText("");item_text.setSelected(true);item_text.setEnabled(true);isChanged = false;}if (!isVisible && (position == -1 + channelList.size())) {item_text.setText("");item_text.setSelected(true);item_text.setEnabled(true);}if(remove_position == position){item_text.setText("");}return view;}/** 添加頻道列表 */public void addItem(ChannelItem channel) {channelList.add(channel);notifyDataSetChanged();}/** 拖動變更頻道排序 */public void exchange(int dragPostion, int dropPostion) {holdPosition = dropPostion;ChannelItem dragItem = getItem(dragPostion);Log.d(TAG, "startPostion=" + dragPostion + ";endPosition=" + dropPostion);if (dragPostion < dropPostion) {channelList.add(dropPostion + 1, dragItem);channelList.remove(dragPostion);} else {channelList.add(dropPostion, dragItem);channelList.remove(dragPostion + 1);}isChanged = true;notifyDataSetChanged();}/** 獲取頻道列表 */public List<ChannelItem> getChannnelLst() {return channelList;}/** 設置刪除的position */public void setRemove(int position) {remove_position = position;notifyDataSetChanged();}/** 刪除頻道列表 */public void remove() {channelList.remove(remove_position);remove_position = -1;notifyDataSetChanged();}/** 設置頻道列表 */public void setListDate(List<ChannelItem> list) {channelList = list;}/** 獲取是否可見 */public boolean isVisible() {return isVisible;}/** 設置是否可見 */public void setVisible(boolean visible) {isVisible = visible;}/** 顯示放下的ITEM */public void setShowDropItem(boolean show) {isItemShow = show;} }

OtherAdapter

public class OtherAdapter extends BaseAdapter {private Context context;public List<ChannelItem> channelList;private TextView item_text;/** 是否可見 */boolean isVisible = true;/** 要刪除的position */public int remove_position = -1;public OtherAdapter(Context context, List<ChannelItem> channelList) {this.context = context;this.channelList = channelList;}@Overridepublic int getCount() {return channelList == null ? 0 : channelList.size();}@Overridepublic ChannelItem getItem(int position) {if (channelList != null && channelList.size() != 0) {return channelList.get(position);}return null;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view = LayoutInflater.from(context).inflate(R.layout.subscribe_category_item, null);item_text = (TextView) view.findViewById(R.id.text_item);ChannelItem channel = getItem(position);item_text.setText(channel.getName());if (!isVisible && (position == -1 + channelList.size())){item_text.setText("");}if(remove_position == position){item_text.setText("");}return view;}/** 獲取頻道列表 */public List<ChannelItem> getChannnelLst() {return channelList;}/** 添加頻道列表 */public void addItem(ChannelItem channel) {channelList.add(channel);notifyDataSetChanged();}/** 設置刪除的position */public void setRemove(int position) {remove_position = position;notifyDataSetChanged();// notifyDataSetChanged();}/** 刪除頻道列表 */public void remove() {channelList.remove(remove_position);remove_position = -1;notifyDataSetChanged();}/** 設置頻道列表 */public void setListDate(List<ChannelItem> list) {channelList = list;}/** 獲取是否可見 */public boolean isVisible() {return isVisible;}/** 設置是否可見 */public void setVisible(boolean visible) {isVisible = visible;} }

ChannelManage

public class ChannelManage {public static ChannelManage channelManage;/*** 默認的用戶選擇頻道列表* */public static List<ChannelItem> defaultUserChannels;/*** 默認的其他頻道列表* */public static List<ChannelItem> defaultOtherChannels;private ChannelDao channelDao;/** 判斷數據庫中是否存在用戶數據 */private boolean userExist = false;static {defaultUserChannels = new ArrayList<ChannelItem>();defaultOtherChannels = new ArrayList<ChannelItem>();defaultUserChannels.add(new ChannelItem(1, "推薦", 1, 1));defaultUserChannels.add(new ChannelItem(2, "熱點", 2, 1));defaultUserChannels.add(new ChannelItem(3, "娛樂", 3, 1));defaultUserChannels.add(new ChannelItem(4, "時尚", 4, 1));defaultUserChannels.add(new ChannelItem(5, "科技", 5, 1));defaultUserChannels.add(new ChannelItem(6, "體育", 6, 1));defaultUserChannels.add(new ChannelItem(7, "軍事", 7, 1));defaultOtherChannels.add(new ChannelItem(8, "財經", 1, 0));defaultOtherChannels.add(new ChannelItem(9, "汽車", 2, 0));defaultOtherChannels.add(new ChannelItem(10, "房產", 3, 0));defaultOtherChannels.add(new ChannelItem(11, "社會", 4, 0));defaultOtherChannels.add(new ChannelItem(12, "情感", 5, 0));defaultOtherChannels.add(new ChannelItem(13, "女人", 6, 0));defaultOtherChannels.add(new ChannelItem(14, "旅游", 7, 0));defaultOtherChannels.add(new ChannelItem(15, "健康", 8, 0));defaultOtherChannels.add(new ChannelItem(16, "美女", 9, 0));defaultOtherChannels.add(new ChannelItem(17, "游戲", 10, 0));defaultOtherChannels.add(new ChannelItem(18, "數碼", 11, 0));}private ChannelManage(SQLHelper paramDBHelper) throws SQLException {if (channelDao == null)channelDao = new ChannelDao(paramDBHelper.getContext());// NavigateItemDao(paramDBHelper.getDao(NavigateItem.class));return;}/*** 初始化頻道管理類* @param paramDBHelper* @throws SQLException*/public static ChannelManage getManage(SQLHelper dbHelper)throws SQLException {if (channelManage == null)channelManage = new ChannelManage(dbHelper);return channelManage;}/*** 清除所有的頻道*/public void deleteAllChannel() {channelDao.clearFeedTable();}/*** 獲取其他的頻道* @return 數據庫存在用戶配置 ? 數據庫內的用戶選擇頻道 : 默認用戶選擇頻道 ;*/public List<ChannelItem> getUserChannel() {Object cacheList = channelDao.listCache(SQLHelper.SELECTED + "= ?",new String[] { "1" });if (cacheList != null && !((List) cacheList).isEmpty()) {userExist = true;List<Map<String, String>> maplist = (List) cacheList;int count = maplist.size();List<ChannelItem> list = new ArrayList<ChannelItem>();for (int i = 0; i < count; i++) {ChannelItem navigate = new ChannelItem();navigate.setId(Integer.valueOf(maplist.get(i).get(SQLHelper.ID)));navigate.setName(maplist.get(i).get(SQLHelper.NAME));navigate.setOrderId(Integer.valueOf(maplist.get(i).get(SQLHelper.ORDERID)));navigate.setSelected(Integer.valueOf(maplist.get(i).get(SQLHelper.SELECTED)));list.add(navigate);}return list;}initDefaultChannel();return defaultUserChannels;}/*** 獲取其他的頻道* @return 數據庫存在用戶配置 ? 數據庫內的其它頻道 : 默認其它頻道 ;*/public List<ChannelItem> getOtherChannel() {Object cacheList = channelDao.listCache(SQLHelper.SELECTED + "= ?" ,new String[] { "0" });List<ChannelItem> list = new ArrayList<ChannelItem>();if (cacheList != null && !((List) cacheList).isEmpty()){List<Map<String, String>> maplist = (List) cacheList;int count = maplist.size();for (int i = 0; i < count; i++) {ChannelItem navigate= new ChannelItem();navigate.setId(Integer.valueOf(maplist.get(i).get(SQLHelper.ID)));navigate.setName(maplist.get(i).get(SQLHelper.NAME));navigate.setOrderId(Integer.valueOf(maplist.get(i).get(SQLHelper.ORDERID)));navigate.setSelected(Integer.valueOf(maplist.get(i).get(SQLHelper.SELECTED)));list.add(navigate);}return list;}if(userExist){return list;}cacheList = defaultOtherChannels;return (List<ChannelItem>) cacheList;}/*** 保存用戶頻道到數據庫* @param userList*/public void saveUserChannel(List<ChannelItem> userList) {for (int i = 0; i < userList.size(); i++) {ChannelItem channelItem = (ChannelItem) userList.get(i);channelItem.setOrderId(i);channelItem.setSelected(Integer.valueOf(1));channelDao.addCache(channelItem);}}/*** 保存其他頻道到數據庫* @param otherList*/public void saveOtherChannel(List<ChannelItem> otherList) {for (int i = 0; i < otherList.size(); i++) {ChannelItem channelItem = (ChannelItem) otherList.get(i);channelItem.setOrderId(i);channelItem.setSelected(Integer.valueOf(0));channelDao.addCache(channelItem);}}/*** 初始化數據庫內的頻道數據*/private void initDefaultChannel(){Log.d("deleteAll", "deleteAll");deleteAllChannel();saveUserChannel(defaultUserChannels);saveOtherChannel(defaultOtherChannels);} }

總結

以上是生活随笔為你收集整理的新闻阅读器频道管理的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。

上一篇： Gson使用指南
下一篇： Could not get unknow