android.widget.BaseAdapter#getCount ( )源码实例Demo

public void setAdapter(BaseAdapter adapter) {
    if (adapter != null) {
        if (adapter.getCount() < this.rowNum * this.colNum) {
            throw new IllegalArgumentException("The view count of adapter is less than this gridview's items");
        }
        this.removeAllViews();
        for (int y = 0; y < rowNum; ++y) {
            TableRow row = new TableRow(context);
            row.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 1.0f));
            for (int x = 0; x < colNum; ++x) {
                View view = adapter.getView(y * colNum + x, this, row);
                row.addView(view, new TableRow.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 1.0f));
            }
            this.addView(row);
        }
    }
    this.adapter = adapter;
}
 

/**
 * 设置适配器
 * @param adapter
 */
public void setAdapter(BaseAdapter adapter) throws NumberOverFlowException {
	this.adapter = adapter;
	if (adapter.getCount() > MAX_NUM) {
		throw new NumberOverFlowException(adapter.getCount());
	}
	adapter.registerDataSetObserver(new DataSetObserver() {
		@Override
		public void onChanged() {
			super.onChanged();
			onDataSetChanged();
		}

		@Override
		public void onInvalidated() {
			super.onInvalidated();
			onDataSetChanged();
		}
	});
	initChild();
}
 

public void updateContactsList() {
	if (null == mIndexValueLv) {
		return;
	}

	BaseAdapter contactsAdapter = (BaseAdapter) mIndexValueLv.getAdapter();
	if (null != contactsAdapter) {
		contactsAdapter.notifyDataSetChanged();
		if (contactsAdapter.getCount() > 0) {

		} else {

		}

	}
}
 

public void refreshContactsLv() {
	if (null == mContactsLv) {
		return;
	}
	
	ViewUtil.hideView(mContactsIndexView);
	
	BaseAdapter contactsAdapter = (BaseAdapter) mContactsLv.getAdapter();
	if (null != contactsAdapter) {
		contactsAdapter.notifyDataSetChanged();
		if (contactsAdapter.getCount() > 0) {
			ViewUtil.showView(mContactsLv);
			ViewUtil.hideView(mSearchResultPromptTv);

		} else {
			ViewUtil.hideView(mContactsLv);
			ViewUtil.showView(mSearchResultPromptTv);

		}
	}
}
 

private void refreshT9SearchGv() {
	if (null == mT9SearchGv) {
		return;
	}

	BaseAdapter baseAdapter = (BaseAdapter) mT9SearchGv.getAdapter();
	Log.i(TAG, "getCount"+baseAdapter.getCount()+"");
	if (null != baseAdapter) {
		baseAdapter.notifyDataSetChanged();
		if (baseAdapter.getCount() > 0) {
			ViewUtil.showView(mT9SearchGv);
			ViewUtil.hideView(mSearchResultPromptTv);
		} else {
			ViewUtil.hideView(mT9SearchGv);
			ViewUtil.showView(mSearchResultPromptTv);
		}
	}
}
 

private void refreshQwertySearchGv() {
	if (null == mQwertySearchGv) {
		return;
	}

	BaseAdapter baseAdapter = (BaseAdapter) mQwertySearchGv.getAdapter();
	Log.i(TAG, "getCount"+baseAdapter.getCount()+"");
	if (null != baseAdapter) {
		baseAdapter.notifyDataSetChanged();
		if (baseAdapter.getCount() > 0) {
			ViewUtil.showView(mQwertySearchGv);
			ViewUtil.hideView(mSearchResultPromptTv);
		} else {
			ViewUtil.hideView(mQwertySearchGv);
			ViewUtil.showView(mSearchResultPromptTv);
		}
	}
}
 

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
		long id) {
	BaseAdapter adapter = AdapterUtil.getAdapter(parent.getAdapter());
	if (adapter == null || position >= adapter.getCount()) {
		return;
	}
	
	User user = (User)adapter.getItem(position);
	if (user == null) {
           return;
       }

	Intent intent = new Intent();
	intent.putExtra("USER", user);
	intent.setClass(parent.getContext(), ProfileActivity.class);
	context.startActivity(intent);
}
 

@Thunk void populateWallpapersFromAdapter(ViewGroup parent, BaseAdapter adapter,
        boolean addLongPressHandler) {
    for (int i = 0; i < adapter.getCount(); i++) {
        FrameLayout thumbnail = (FrameLayout) adapter.getView(i, null, parent);
        parent.addView(thumbnail, i);
        WallpaperTileInfo info = (WallpaperTileInfo) adapter.getItem(i);
        thumbnail.setTag(info);
        info.setView(thumbnail);
        if (addLongPressHandler) {
            addLongPressHandler(thumbnail);
        }
        thumbnail.setOnClickListener(mThumbnailOnClickListener);
    }
}
 

private void populateWallpapersFromAdapter(ViewGroup parent, BaseAdapter adapter,
        boolean addLongPressHandler) {
    for (int i = 0; i < adapter.getCount(); i++) {
        FrameLayout thumbnail = (FrameLayout) adapter.getView(i, null, parent);
        parent.addView(thumbnail, i);
        WallpaperTileInfo info = (WallpaperTileInfo) adapter.getItem(i);
        thumbnail.setTag(info);
        info.setView(thumbnail);
        if (addLongPressHandler) {
            addLongPressHandler(thumbnail);
        }
        thumbnail.setOnClickListener(mThumbnailOnClickListener);
    }
}
 

private void populateWallpapersFromAdapter(ViewGroup parent, BaseAdapter adapter,
        boolean addLongPressHandler) {
    for (int i = 0; i < adapter.getCount(); i++) {
        FrameLayout thumbnail = (FrameLayout) adapter.getView(i, null, parent);
        parent.addView(thumbnail, i);
        WallpaperTileInfo info = (WallpaperTileInfo) adapter.getItem(i);
        thumbnail.setTag(info);
        info.setView(thumbnail);
        if (addLongPressHandler) {
            addLongPressHandler(thumbnail);
        }
        thumbnail.setOnClickListener(mThumbnailOnClickListener);
    }
}
 

public ArticleCollectionPagerAdapter(Application app, BaseAdapter data, ToBlob toBlob, FragmentManager fm) {
    super(fm);
    this.app = app;
    this.data = data;
    this.count = data.getCount();
    this.observer = new DataSetObserver(){
        @Override
        public void onChanged() {
            count = ArticleCollectionPagerAdapter.this.data.getCount();
            notifyDataSetChanged();
        }
    };
    data.registerDataSetObserver(observer);
    this.toBlob = toBlob;
}
 

/**
 * Constructs a {@linkplain CircularListAdapter}.
 * 
 * @param listAdapter A {@link ListAdapter} that has to behave circular.
 */
public CircularListAdapter(BaseAdapter listAdapter) {
    if(listAdapter == null) {
        throw new IllegalArgumentException("listAdapter cannot be null.");
    }
    
    this.mListAdapter = listAdapter;
    this.mListAdapterCount = listAdapter.getCount();
}