ListView分页

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android(基础)

android listview 分页

package hbq.android.myapp.listview;

import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AbsListView.OnScrollListener;
import android.widget.LinearLayout.LayoutParams;

public class MainActivity extends ListActivity implements OnScrollListener {
	private static final String TAG = "MainActivity";

	private ListViewAdapter adapter = new ListViewAdapter();
	ListView listView;
	private int lastItem = 0;
	LinearLayout loadingLayout;
	/**
	 * 设置布局显示属性
	 */
	private LayoutParams mLayoutParams = new LinearLayout.LayoutParams(
			LinearLayout.LayoutParams.WRAP_CONTENT,
			LinearLayout.LayoutParams.WRAP_CONTENT);
	/**
	 * 设置布局显示目标最大化属性
	 */
	private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams(
			LinearLayout.LayoutParams.FILL_PARENT,
			LinearLayout.LayoutParams.FILL_PARENT);

	private ProgressBar progressBar;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		Log.i(TAG, "onCreate(Bundle savedInstanceState)>>>>>>>>>>>>>>>");
		// 线性布局
		LinearLayout layout = new LinearLayout(this);
		// 设置布局 水平方向
		layout.setOrientation(LinearLayout.HORIZONTAL);
		// 进度条
		progressBar = new ProgressBar(this);
		// 进度条显示位置
		progressBar.setPadding(0, 0, 15, 0);
		// 把进度条加入到layout中
		layout.addView(progressBar, mLayoutParams);
		// 文本内容
		TextView textView = new TextView(this);
		textView.setText("加载中...");
		textView.setGravity(Gravity.CENTER_VERTICAL);
		// 把文本加入到layout中
		layout.addView(textView, FFlayoutParams);
		// 设置layout的重力方向,即对齐方式是
		layout.setGravity(Gravity.CENTER);

		// 设置ListView的页脚layout
		loadingLayout = new LinearLayout(this);
		loadingLayout.addView(layout, mLayoutParams);
		loadingLayout.setGravity(Gravity.CENTER);

		// 得到一个ListView用来显示条目
		listView = getListView();
		// 添加到脚页显示
		listView.addFooterView(loadingLayout);
		// 给ListView添加适配器
		setListAdapter(adapter);
		// 给ListView注册滚动监听
		listView.setOnScrollListener(this);
	}

	@Override
	public void onScroll(AbsListView v, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) {
		Log.i(TAG, "Scroll>>>first: " + firstVisibleItem + ", visible: "
				+ visibleItemCount + ", total: " + totalItemCount);
		lastItem = firstVisibleItem + visibleItemCount - 1;
		Log.i(TAG, "Scroll>>>lastItem:" + lastItem);
		// 显示50条ListItem，即0-49，因为onScroll是在“滑动”执行过之后才触发，所以用adapter.count<=41作条件
		if (adapter.count <= 41) {
			if (firstVisibleItem + visibleItemCount == totalItemCount) {
				adapter.count += 10;
				adapter.notifyDataSetChanged();
				listView.setSelection(lastItem);
				int currentPage = adapter.count / 10;
				Toast.makeText(getApplicationContext(),
						"第" + currentPage + "页", Toast.LENGTH_LONG).show();
			}
		} else {
			listView.removeFooterView(loadingLayout);
		}

	}

	@Override
	public void onScrollStateChanged(AbsListView v, int state) {
		if (lastItem == adapter.count
				&& state == OnScrollListener.SCROLL_STATE_IDLE) {
			Log.i(TAG, "ScrollStateChanged>>>state:" + state + "lastItem:"
					+ lastItem);
			// 显示50条ListItem,即0-49,因为onScrollStateChanged是在“拖动滑动”执行过之后才触发,所以用adapter.count<=41作条件
			if (adapter.count <= 41) {
				adapter.count += 10;
				adapter.notifyDataSetChanged();
			}

		}
	}

	/**
	 * 要用用于生成显示数据
	 * 
	 */
	class ListViewAdapter extends BaseAdapter {
		int count = 10;

		public int getCount() {
			Log.i(TAG, "getCount>>>count:" + count);
			return count;
		}

		public Object getItem(int pos) {
			Log.i(TAG, "getItem>>>pos:" + pos);
			return pos;
		}

		public long getItemId(int pos) {
			Log.i(TAG, "getItemId>>>ItemId:" + pos);
			return pos;
		}

		public View getView(int pos, View v, ViewGroup p) {
			Log.i(TAG, "getView>>>pos:" + pos);
			TextView view;
			if (v == null) {
				view = new TextView(MainActivity.this);
			} else {
				view = (TextView) v;
			}
			view.setText("ListItem " + pos);
			view.setTextSize(20f);
			view.setGravity(Gravity.CENTER);
			view.setHeight(60);
			return view;
		}
	}
}

package hbq.android.myapp.listview;

import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.LinearLayout.LayoutParams;

public class ButtonLoadingActivity extends ListActivity {
	private static final String TAG = "ButtonLoadingActivity";

	private ListViewAdapter adapter = new ListViewAdapter();
	private ListView listView;
	/**
	 * 设置布局显示的属性
	 */
	private LayoutParams mLayoutParams = new LinearLayout.LayoutParams(
			LinearLayout.LayoutParams.WRAP_CONTENT,
			LinearLayout.LayoutParams.WRAP_CONTENT);
	/**
	 * 设置布局显示目标最大化属性
	 */
	private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams(
			LinearLayout.LayoutParams.FILL_PARENT,
			LinearLayout.LayoutParams.FILL_PARENT);

	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.i(TAG, "onCreate(Bundle savedInstanceState)>>>>>>>>>>>>>>>");
		LinearLayout layout = new LinearLayout(this);
		layout.setOrientation(LinearLayout.HORIZONTAL);

		Button button = new Button(this);
		button.setText("点击加载下10条...");
		button.setGravity(Gravity.CENTER_VERTICAL);

		layout.addView(button, FFlayoutParams);
		layout.setGravity(Gravity.CENTER);
		LinearLayout loadingLayout = new LinearLayout(this);
		loadingLayout.addView(layout, mLayoutParams);
		loadingLayout.setGravity(Gravity.CENTER);

		listView = getListView();

		listView.addFooterView(loadingLayout);

		button.setOnClickListener(new Button.OnClickListener() {
			@Override
			public void onClick(View v) {
				adapter.count += 10;
				Log.i(TAG, "setOnClickListener:" + adapter.count);
				adapter.notifyDataSetChanged();
				int currentPage = adapter.count / 10;
				Toast.makeText(getApplicationContext(),
						"第" + currentPage + "页", Toast.LENGTH_LONG).show();
			}
		});

		setListAdapter(adapter);
	}

	class ListViewAdapter extends BaseAdapter {
		int count = 10; /* starting amount */

		public int getCount() {
			return count;
		}

		public Object getItem(int pos) {
			return pos;
		}

		public long getItemId(int pos) {
			return pos;
		}

		public View getView(int pos, View v, ViewGroup p) {
			Log.i(TAG, "getView>>>pos:" + pos);
			TextView view;
			if (v == null) {
				view = new TextView(ButtonLoadingActivity.this);
			} else {
				view = (TextView) v;
			}
			view.setText("ListItem " + pos);
			view.setTextSize(20f);
			view.setGravity(Gravity.CENTER);
			view.setHeight(60);
			return view;
		}
	}

}