Android 开发笔记 ListView分页加载数据（底部添加进度条或button）

当ListView的数据需要分页加载时，通常会在ListView滚动到底部时加上一个More的TextView或一个进度条。

1.添加TextView，当滚动到底部Button出现时，点击Button加载下一页的数据，只要给Button添加点击事件去获取数据即可。

2.添加进度条，当滚到底部出现进度条时，这个时候要进行位置判断，判断进度条出现的位置坐标，符合条件就去获取数据。

XML文件：

list.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" > 

    <ListView

        android:id="@+id/list"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:cacheColorHint="#00000000" >

    </ListView>

</LinearLayout> 

More的 TextView和进度条都可以不写xml文件，直接在java代码中加，但是我偏好些xml文件，布局修改方便。

more.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/more"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:onClick="onClick"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="更多" android:textSize="20dp" android:textStyle="bold" android:gravity="center" android:minHeight="60dp"/>

</LinearLayout> 

 

 进度条文件more.xml：

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="50dp" >

    <ProgressBar

        android:id="@+id/progressBar1"

        style="?android:attr/progressBarStyleSmall"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerInParent="true" />

</RelativeLayout> 

 

 

 ListActivity.java文件代码：

 public class ListActivity extends Activity {

ListView list;

 @Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.customer);

list = (ListView) findViewById(R.id.list_customer);

initeListView();

initRadios();

setMoreCtrl(false);

getCustomerFromServer();

CommonUtility.showLoading(this, null, "正在加载数据...");

}

private void setMoreCtrl(boolean isLocal) {

if (more == null) {

more = LayoutInflater.from(getApplicationContext()).inflate(

R.layout.more, null);

more.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

++curPage;

getCustomerFromServer();

}

});

list.addFooterView(more);

}

}

 

 private void getCustomerFromServer() {

CommonUtility.showLoading(this, null, "正在加载数据...");

getResourceTask = new Thread() {

public void run() {

Log.d("", "curPage:" + curPage);

if (curPage == 1) {

myList = DataTaker.getCustomers(isReach, curPage);

} else if (curPage > 1) {

if (myList == null)

myList = new ArrayList<Customer>();

myList.addAll(DataTaker.getCustomers(isReach, curPage));

}

if (myList != null) {

runOnUiThread(new Runnable() {

public void run() {

if (myList != null) {

if (adapter == null) {

adapter = new AppsAdapter();

list.setAdapter(adapter);

} else {

adapter.notifyDataSetChanged();

}

}

 

getResourceTask = null;

}

});

}

CommonUtility.cancelLoading();

}

};

getResourceTask.start();

} 

 

 

 class WebAdapter extends BaseAdapter {

@Override

public int getCount() {

return myList.size();

}

@Override

public Object getItem(int position) {

return myList.get(position);

}

@Override

public long getItemId(int position) {

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

Customer customer = myList.get(position);

CheckBox chk = null;

if (convertView == null) {

convertView = LayoutInflater.from(getApplicationContext())

.inflate(R.layout.customer_item, null);

chk = ((CheckBox) convertView.findViewById(R.id.chb));

chk.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

int i = Integer.valueOf(buttonView.getTag().toString());

myList.get(i).isChecked = isChecked;

}

});

}

if (chk == null) {

chk = ((CheckBox) convertView.findViewById(R.id.chb));

}

chk.setTag(position);

chk.setChecked(customer.isChecked);

((TextView) convertView.findViewById(R.id.txt_flow)).setText(String

.valueOf(customer.flow));

((TextView) convertView.findViewById(R.id.txt_time)).setText(String

.valueOf(customer.main_call_duration));

float last_flow = 0;

if (customer.last_3_customer_flows != null

&& customer.last_3_customer_flows.size() > 0)

last_flow = customer.last_3_customer_flows.get(0).flow;

((TextView) convertView.findViewById(R.id.txt_last_flow))

.setText(String.valueOf(last_flow));

String os = "未知";

if (customer.os_name != null && !customer.os_name.equals(""))

os = customer.os_name;

((TextView) convertView.findViewById(R.id.txt_os)).setText(os);

((TextView) convertView.findViewById(R.id.txt_phone))

.setText(customer.phone_number);

return convertView;

}

} 

} 

 

对于TextView只要加上onClick监听事件就可以，上面的代码也写了。

下面的代码为添加进度条所用的：

list.setOnScrollListener(new OnScrollListener() {

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

if (scrollState == OnScrollListener.SCROLL_STATE_IDLE

&& list.getLastVisiblePosition() == list.getCount() - 1) {

int[] location = new int[2];

if (more != null)

more.getLocationOnScreen(location);

if (location[1] > list.getBottom() - 20) {

getResource();

}

}

}

@Override

public void onScroll(AbsListView view, int firstVisibleItem,

int visibleItemCount, int totalItemCount) {

}

}); 

 

这个位置监听，当滚动到底部进度条出现时就会继续加载了 

 

转载于:https://www.cnblogs.com/linvaluable/archive/2012/08/17/2644096.html