Android滚动加载数据

1. 代码

package android.test; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.app.ProgressDialog; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.LayoutInflater; import android.view.View; import android.widget.AbsListView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.AbsListView.OnScrollListener; public class Main extends Activity { private ListView m_listView; private List m_data = new ArrayList<String>(); private ArrayAdapter<String> m_adapter; private View m_footerView; private boolean m_bIsLoading = false; private Handler m_handler = new Handler() { @Override public void handleMessage(Message msg) { m_footerView.setVisibility(View.INVISIBLE); for (int i = m_listView.getCount(); i < m_listView.getCount() + 10; ++i) { m_data.add("test__" + i); } m_adapter.notifyDataSetChanged(); m_bIsLoading = false; } }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); m_listView = (ListView) findViewById(R.id.listView1); m_footerView = LayoutInflater.from(this).inflate(R.layout.loading, null); m_listView.addFooterView(m_footerView); m_footerView.setVisibility(View.INVISIBLE); for (int i = 0; i < 10; ++i) { m_data.add("test__" + i); } m_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, m_data); m_listView.setAdapter(m_adapter); m_listView.setOnScrollListener(new OnScrollListener() { @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { if (view.getLastVisiblePosition() >= totalItemCount - 1) { CheckLoadMore(); } } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } }); } private void CheckLoadMore() { if (m_bIsLoading) return; if (m_listView.getFooterViewsCount() != 0) { m_footerView.setVisibility(View.VISIBLE); m_listView.setSelection(m_data.size() - 1); LoadMoreItems(); } } private void LoadMoreItems() { m_bIsLoading = true; new Thread() { public void run() { try { Thread.sleep(2000); m_handler.sendEmptyMessage(0); } catch (InterruptedException e) { e.printStackTrace(); } }; }.start(); } }

2. AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="android.test" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="7" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Main" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>

3. loading.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" > <ProgressBar android:id="@+android:id/progress_large" android:layout_width="60px" android:layout_height="60px" android:layout_marginLeft="120px" android:layout_marginTop="10px" > </ProgressBar> <TextView android:id="@+id/loading_msg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="30sp" android:text="@string/loading" android:layout_marginLeft="12px" android:layout_marginTop="10px" > </TextView> </LinearLayout>

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