ListView中加上加FootView和点击按钮动态加载listview
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;/** ** @author huangbq * */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; } }} 2.用OnScrollListener来监听是不是最后一条项目来加载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.view.View.OnClickListener;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;/** ** @author huangbq * */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;@Overrideprotected 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layoutloadingLayout = new LinearLayout(this);loadingLayout.addView(layout, mLayoutParams);loadingLayout.setGravity(Gravity.CENTER);loadingLayout.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if (adapter.count<=41) {adapter.count += 10;adapter.notifyDataSetChanged();}else{listView.removeFooterView(loadingLayout); }}});//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);}@Overridepublic 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); }*/}@Overridepublic 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();}else{listView.removeFooterView(loadingLayout); }*/}}/** * 要用用于生成显示数据 * @author huangbq * */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;}}}
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