Android基于ListView和CheckBox实现多选和全选记录的功能(转)

JAVA代码

/**

* @author zuolongsnail@163.com

* MultiSelectActivity

*/

public class MultiSelectActivity extends Activity implements OnClickListener,

OnItemClickListener {

private static final String TAG = "MultiSelectActivity";

private ListView contactsDelList;

private Button contactsDelBtn;

private Button contactsCancelBtn;

private CheckBox selectAll;

private Cursor cursor;

private ContactsDeleteAdapter contactsDeleteAdapter;

private static final String[] PROJECTION = new String[] { Contacts._ID,

Contacts.DISPLAY_NAME };

private static final int CONTACTS_ID_INDEX = 0;

private static final int DISPLAY_NAME_INDEX = 1;

private ContactsDeleteListItemViews holderViews;

private final class ContactsDeleteListItemViews {

TextView nameView;

CheckBox delCheckBox;

}

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.contacts_delete_activity);

contactsDelList = (ListView) findViewById(R.id.contacts_delete_list);

contactsDelBtn = (Button) findViewById(R.id.contacts_delete_btn);

contactsCancelBtn = (Button) findViewById(R.id.contacts_cancel_btn);

selectAll = (CheckBox) (findViewById(R.id.contacts_delete_list_header)

.findViewById(R.id.select_all));

contactsDelList.setOnItemClickListener(this);

contactsDelBtn.setOnClickListener(this);

contactsCancelBtn.setOnClickListener(this);

selectAll.setOnClickListener(this);

}

@Override

protected void onResume() {

super.onResume();

refreshData();

}

// 查询数据库

private void refreshData() {

cursor = getContentResolver().query(Contacts.CONTENT_URI, PROJECTION,

null, null, null);

contactsDeleteAdapter = new ContactsDeleteAdapter(this, cursor);

contactsDelList.setAdapter(contactsDeleteAdapter);

}

class ContactsDeleteAdapter extends BaseAdapter {

Cursor cur;

Map<Integer, Boolean> selectedMap;

HashSet<String> delContactsIdSet;

public ContactsDeleteAdapter(Context context, Cursor c) {

cur = c;

// 保存每条记录是否被选中的状态

selectedMap = new HashMap<Integer, Boolean>();

// 保存被选中记录作数据库表中的Id

delContactsIdSet = new HashSet<String>();

for (int i = 0; i < cur.getCount(); i++) {

selectedMap.put(i, false);

}

}

@Override

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

if (convertView == null) {

convertView = LayoutInflater.from(MultiSelectActivity.this)

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

holderViews = new ContactsDeleteListItemViews();

holderViews.nameView = (TextView) convertView

.findViewById(R.id.name);

holderViews.delCheckBox = (CheckBox) convertView

.findViewById(R.id.delete_list_item);

convertView.setTag(holderViews);

}

cur.moveToPosition(position);

ContactsDeleteListItemViews views = (ContactsDeleteListItemViews) convertView

.getTag();

final String name = cur.getString(DISPLAY_NAME_INDEX);

views.nameView.setText(name);

views.delCheckBox.setChecked(selectedMap.get(position));

// 保存记录Id

if (selectedMap.get(position)) {

delContactsIdSet.add(String.valueOf(cur

.getInt(CONTACTS_ID_INDEX)));

} else {

delContactsIdSet.remove(String.valueOf(cur

.getInt(CONTACTS_ID_INDEX)));

}

return convertView;

}

@Override

public int getCount() {

return cur.getCount();

}

@Override

public Object getItem(int position) {

if (cur.moveToPosition(position)) {

return cur;

} else {

return null;

}

}

@Override

public long getItemId(int position) {

return position;

}

}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.select_all:

// 全选CheckBox的click事件处理

if (selectAll.isChecked()) {

for (int i = 0; i < contactsDeleteAdapter.getCount(); i++) {

contactsDeleteAdapter.selectedMap.put(i, true);

//click事件：全选checkbox被勾选则把所有的联系人ID添加到delContactsIdSet中

contactsDeleteAdapter.cur.moveToPosition(i);

contactsDeleteAdapter.delContactsIdSet.add(String

.valueOf(contactsDeleteAdapter.cur

.getInt(CONTACTS_ID_INDEX)));

}

contactsDelBtn.setEnabled(true);

} else {

for (int i = 0; i < contactsDeleteAdapter.getCount(); i++) {

contactsDeleteAdapter.selectedMap.put(i, false);

}

//click事件：全选checkbox被取消勾选则把delContactsIdSet清空

contactsDeleteAdapter.delContactsIdSet.clear();

contactsDelBtn.setEnabled(false);

}

contactsDeleteAdapter.notifyDataSetChanged();

break;

case R.id.contacts_delete_btn:

new AlertDialog.Builder(this).setTitle(

R.string.clearConfirmation_title).setMessage(

R.string.clearConfirmation).setNegativeButton(

android.R.string.cancel, null).setPositiveButton(

android.R.string.ok, new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

final ProgressDialog progressDialog = ProgressDialog

.show(

MultiSelectActivity.this,

getString(R.string.clearProgress_title),

"", true, false);

final AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {

@Override

protected Void doInBackground(Void... params) {

// 删除记录事件处理（我这里就不写详细的代码了）

return null;

}

@Override

protected void onPostExecute(Void result) {

progressDialog.dismiss();

}

};

progressDialog.show();

task.execute();

}

}).setCancelable(true).create().show();

break;

case R.id.contacts_cancel_btn:

// 取消事件处理

break;

}

}

@Override

public void onItemClick(AdapterView<?> arg0, View view, int position,

long id) {

Log.i(TAG, "onItemClick");

ContactsDeleteListItemViews views = (ContactsDeleteListItemViews) view

.getTag();

views.delCheckBox.toggle();

contactsDeleteAdapter.selectedMap.put(position, views.delCheckBox

.isChecked());

contactsDeleteAdapter.notifyDataSetChanged();

// 判断是否有记录没被选中，以便修改全选CheckBox勾选状态

if (contactsDeleteAdapter.selectedMap.containsValue(false)) {

selectAll.setChecked(false);

} else {

selectAll.setChecked(true);

}

// 判断是否有记录被选中，以便设置删除按钮是否可用

if (contactsDeleteAdapter.selectedMap.containsValue(true)) {

contactsDelBtn.setEnabled(true);

} else {

contactsDelBtn.setEnabled(false);

}

}

}

布局文件xml

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

<!--

zuolongsnail@163.com

This layout of delete contacts.

-->

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<include

android:id="@+id/contacts_delete_list_header"

layout="@layout/contacts_delete_list_header" />

<ListView

android:id="@+id/contacts_delete_list"

android:layout_width="match_parent"

android:layout_height="0dip"

android:layout_weight="1" />

<LinearLayout

style="@android:style/ButtonBar"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal" >

<Button

android:id="@+id/contacts_delete_btn"

android:layout_width="0dip"

android:layout_height="wrap_content"

android:layout_weight="1"

android:enabled="false"

android:text="@string/delete" />

<Button

android:id="@+id/contacts_cancel_btn"

android:layout_width="0dip"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="@string/cancel" />

</LinearLayout>

</LinearLayout>