请我真的需要列表视图过滤器的帮助，因为我看过很多教程，但它不起作用。我真的厌倦了这个只是我需要 EdiText 过滤器
我的项目包含四个类：
1-位置活动（l'活动预）
public class LocationActivity extends Activity implements LocationListener{
public final static String LOCATION_ID = "location_id";
private long location_id;
private EditText name;
private EditText comment;
private RatingBar ratevalue;
private EditText latitude;
private EditText longitude;
private TextView current_latitude;
private TextView current_longitude;
private TextView current_source;
private TextView current_accuracy;
private LocationDatabase db;
private BestLocationProxy best_location_proxy;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
db = new LocationDatabase(this);
best_location_proxy = new BestLocationProxy(this);
if (savedInstanceState != null) {
location_id = savedInstanceState.getLong(LOCATION_ID);
}
Intent intent = getIntent();
location_id = intent.getLongExtra(LOCATION_ID, -1);
setContentView(R.layout.location);
name = (EditText) findViewById(R.id.name);
comment = (EditText) findViewById(R.id.comment);
ratevalue = (RatingBar) findViewById(R.id.ratingbar);
latitude = (EditText) findViewById(R.id.latitude);
longitude = (EditText) findViewById(R.id.longitude);
current_latitude = (TextView) findViewById(R.id.current_latitude);
current_longitude = (TextView) findViewById(R.id.current_longitude);
current_source = (TextView) findViewById(R.id.current_source);
current_accuracy = (TextView) findViewById(R.id.current_accuracy);
updateLocation(best_location_proxy.getLastKnownLocation());
Button set_location = (Button) findViewById(R.id.set_location);
set_location.setOnClickListener(new OnClickListener(){
public void onClick(View arg0) {
Location l = best_location_proxy.getLastKnownLocation();
if (l == null) {
return;
}
latitude.setText(Double.toString(l.getLatitude()));
longitude.setText(Double.toString(l.getLongitude()));
}
});
Button closeButton = (Button) findViewById(R.id.close_location_window);
closeButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
finish();
}
});
if (location_id != -1) {
Cursor c = db.getLocation(location_id);
if (c.getCount() != 1) {
finish();
return;
}
c.moveToFirst();
int name_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_NAME);
int comment_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_COMM);
int ratevalue_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_RATE);
int latitude_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_LATITUDE);
int longitude_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_LONGITUDE);
name.setText(c.getString(name_id));
comment.setText(c.getString(comment_id));
ratevalue.setRating(c.getLong(ratevalue_id));
latitude.setText(Double.toString(c.getDouble(latitude_id)));
longitude.setText(Double.toString(c.getDouble(longitude_id)));
c.close();
}
}
@Override
protected void onResume() {
super.onResume();
best_location_proxy.requestLocationUpdates(100000, 0, this);
}
@Override
protected void onPause() {
super.onPause();
best_location_proxy.removeUpdates(this);
String s_name = name.getText().toString();
if (s_name.equals("")) {
return;
}
String s_comment = comment.getText().toString();
if (s_comment.equals("")) {
return;
}
Double d_ratevalue = (double) ratevalue.getRating();
Double d_latitude = null;
String s_latitude = latitude.getText().toString();
if (!s_latitude.equals("")) {
d_latitude = Double.parseDouble(s_latitude);
}
Double d_longitude = null;
String s_longitude = longitude.getText().toString();
if (!s_longitude.equals("")) {
d_longitude = Double.parseDouble(s_longitude);
}
if (location_id != -1) {
db.updateLocation(location_id, s_name, s_comment, d_ratevalue, d_latitude, d_longitude);
} else {
location_id = db.createLocation(s_name, s_comment, d_ratevalue, d_latitude, d_longitude);
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putLong(LOCATION_ID, location_id);
}
private void updateLocation(Location l){
if (l == null){
current_source.setText(R.string.no_provider);
current_latitude.setText(R.string.unavailable);
current_longitude.setText(R.string.unavailable);
current_accuracy.setText(R.string.unavailable);
return;
}
String source;
if (l.getProvider().equals(LocationManager.GPS_PROVIDER)){
source = getString(R.string.location_map);
} else if (l.getProvider().equals(LocationManager.NETWORK_PROVIDER)){
source = getString(R.string.cell);
} else {
source = getString(R.string.unknown);
}
current_source.setText(source);
current_latitude.setText(Double.toString(l.getLatitude()));
current_longitude.setText(Double.toString(l.getLongitude()));
current_accuracy.setText(Float.toString(l.getAccuracy()));
}
public void onLocationChanged(Location location) {
updateLocation(location);
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
2-位置列表活动（列表视图活动）
public class LocationListActivity extends ListActivity {
private Cursor locations;
private LocationDatabase db;
private final static String RADAR_ACTION = "com.google.android.radar.SHOW_RADAR";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
db = new LocationDatabase(this);
setContentView(R.layout.list);
registerForContextMenu(this.getListView());
getListView().setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Cursor c = (Cursor) parent.getAdapter().getItem(position);
int name_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_NAME);
int latitude_id = c
.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_LATITUDE);
int longitude_id = c
.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_LONGITUDE);
String name = c.getString(name_id);
float latitude = c.getFloat(latitude_id);
float longitude = c.getFloat(longitude_id);
startBest(latitude, longitude, name);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuItem add = menu.add(R.string.location_add);
add.setIcon(android.R.drawable.ic_menu_add);
add.setOnMenuItemClickListener(new OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
Intent i = new Intent();
i.setClass(LocationListActivity.this, LocationActivity.class);
startActivity(i);
return true;
}
});
return true;
}
@Override
protected void onResume() {
super.onResume();
updateList();
}
@Override
protected void onStop() {
super.onStop();
if (locations != null){
locations.close();
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
Cursor c = (Cursor) getListView().getItemAtPosition(info.position);
int id_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_ID);
int name_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_NAME);
int latitude_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_LATITUDE);
int longitude_id = c.getColumnIndex(LocationDatabase.FIELD_LOCATIONS_LONGITUDE);
final long id = c.getLong(id_id);
final String name = c.getString(name_id);
final float latitude = c.getFloat(latitude_id);
final float longitude = c.getFloat(longitude_id);
menu.setHeaderTitle(name);
MenuItem map = menu.add(R.string.location_map);
map.setOnMenuItemClickListener(new OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
startMap(latitude, longitude, name);
return true;
}
});
MenuItem edit = menu.add(R.string.location_edit);
edit.setOnMenuItemClickListener(new OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
Intent i = new Intent();
i.setClass(LocationListActivity.this, LocationActivity.class);
i.putExtra(LocationActivity.LOCATION_ID, id);
startActivity(i);
return true;
}
});
MenuItem delete = menu.add(R.string.location_delete);
delete.setOnMenuItemClickListener(new OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
db.deleteLocation(id);
updateList();
return true;
}
});
}
private void updateList() {
if (locations != null) {
locations.close();
}
locations = db.getAllLocations();
ListAdapter adapter = new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_1, locations,
new String[] { LocationDatabase.FIELD_LOCATIONS_NAME, },
new int[] { android.R.id.text1 });
setListAdapter(adapter);
}
private void startRadar(float latitude, float longitude){
Intent i = new Intent(RADAR_ACTION);
i.putExtra("latitude", latitude);
i.putExtra("longitude", longitude);
startActivity(i);
}
private void startMap(float latitude, float longitude, String name){
Formatter f = new Formatter(Locale.US);
f.format("geo:0,0?q=%1$.5f,%2$.5f(%3$s)", latitude, longitude, name);
Uri uri = Uri.parse(f.toString());
Intent i = new Intent(Intent.ACTION_VIEW, uri);
startActivity(i);
}
private void startBest(float latitude, float longitude, String name){
if (isRadarAvailable()){
startRadar(latitude, longitude);
} else {
startMap(latitude, longitude, name);
}
}
private boolean isRadarAvailable(){
return isIntentAvailable(RADAR_ACTION);
}
private boolean isIntentAvailable(String action) {
PackageManager packageManager = getPackageManager();
final Intent intent = new Intent(action);
@SuppressWarnings("rawtypes")
List list =
packageManager.queryIntentActivities(intent,
PackageManager.MATCH_DEFAULT_ONLY);
return list.size() > 0;
}
}
3-位置数据库 （数据库活动 sqlite）
public class LocationDatabase extends SQLiteOpenHelper {
public final static String TAG = LocationDatabase.class.toString();
public final static String DB_NAME = "locations";
public final static int DB_VERSION = 1;
public final static String TABLE_LOCATIONS = "locations";
public final static String FIELD_LOCATIONS_ID = "_id";
public final static String FIELD_LOCATIONS_NAME = "name";
public final static String FIELD_LOCATIONS_COMM = "comment";
public final static String FIELD_LOCATIONS_RATE = "ratevalue";
public final static String FIELD_LOCATIONS_LATITUDE = "latitude";
public final static String FIELD_LOCATIONS_LONGITUDE = "longitude";
public final static String[] PROJECTION_LOCATIONS = { FIELD_LOCATIONS_ID,
FIELD_LOCATIONS_NAME, FIELD_LOCATIONS_COMM, FIELD_LOCATIONS_RATE, FIELD_LOCATIONS_LATITUDE,
FIELD_LOCATIONS_LONGITUDE };
public LocationDatabase(Context context) {
super(context, DB_NAME, null, DB_VERSION);
getWritableDatabase(); // make upgrades work
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_LOCATIONS + " ( " +
FIELD_LOCATIONS_ID + " INTEGER PRIMARY KEY NOT NULL, " +
FIELD_LOCATIONS_NAME + " Text, " +
FIELD_LOCATIONS_COMM + " Text, " +
FIELD_LOCATIONS_RATE + " REAL, " +
FIELD_LOCATIONS_LATITUDE + " REAL, "
+ FIELD_LOCATIONS_LONGITUDE + " REAL )");
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
}
public long createLocation(String name, String comment, Double ratevalue, Double latitude, Double longitude) {
Log.d(TAG, "Inserting location " + name + comment + ratevalue);
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(FIELD_LOCATIONS_NAME, name);
values.put(FIELD_LOCATIONS_COMM, comment);
values.put(FIELD_LOCATIONS_RATE, ratevalue);
values.put(FIELD_LOCATIONS_LATITUDE, latitude);
values.put(FIELD_LOCATIONS_LONGITUDE, longitude);
long id = db.insert(TABLE_LOCATIONS, null, values);
Log.d(TAG, Long.toString(id));
db.close();
return id;
}
public void updateLocation(Long location_id, String name, String comment, Double ratevalue, Double latitude,
Double longitude) {
Log.d(TAG, "Updating location");
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(FIELD_LOCATIONS_NAME, name);
values.put(FIELD_LOCATIONS_COMM, comment);
values.put(FIELD_LOCATIONS_RATE, ratevalue);
values.put(FIELD_LOCATIONS_LATITUDE, latitude);
values.put(FIELD_LOCATIONS_LONGITUDE, longitude);
db.update(TABLE_LOCATIONS, values, "_id = ?",
new String[] { location_id.toString() });
db.close();
}
public Cursor getAllLocations() {
Log.d(TAG, "Selecting all locations");
SQLiteDatabase db = getReadableDatabase();
Cursor c = db.query(TABLE_LOCATIONS, PROJECTION_LOCATIONS, null, null,
null, null, FIELD_LOCATIONS_NAME);
Log.d(TAG, Integer.toString(c.getCount()));
db.close();
return c;
}
public Cursor getLocation(long location_id) {
Log.d(TAG, "Selecting location " + Long.toString(location_id));
SQLiteDatabase db = getReadableDatabase();
Cursor c = db.query(TABLE_LOCATIONS, PROJECTION_LOCATIONS, "_id = ?",
new String[] { Long.toString(location_id) }, null, null, null);
Log.d(TAG, Integer.toString(c.getCount()));
db.close();
return c;
}
public void deleteLocation(long location_id){
Log.d(TAG, "Deleting location " + Long.toString(location_id));
SQLiteDatabase db = getWritableDatabase();
db.delete(TABLE_LOCATIONS, "_id = ?", new String[] {Long.toString(location_id)});
}
}
4-最佳位置代理
在布局中，我有位置.xml和列表.xml
1-位置.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="311dp"
android:orientation="vertical"
android:paddingRight="20dip" >
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:text="@string/name"
android:gravity="left|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:editable="true"
android:id="@+id/name"
android:singleLine="true"
android:layout_weight="1" />
<TextView
android:text="@string/comment"
android:gravity="left|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:editable="true"
android:id="@+id/comment"
android:singleLine="true"
android:layout_weight="1" />
<TextView
android:text="@string/Rate"
android:gravity="left|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
</TableLayout>
<RatingBar
android:id="@+id/ratingbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:stepSize="1"
/>
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<TextView
android:text="@string/latitude"
android:gravity="left|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:editable="true"
android:id="@+id/latitude"
android:singleLine="true"
android:layout_weight="1"
android:numeric="signed|decimal" />
<TextView
android:text="@string/longitude"
android:gravity="left|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:editable="true"
android:id="@+id/longitude"
android:singleLine="true"
android:layout_weight="1"
android:numeric="signed|decimal" />
</TableLayout>
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TableRow>
<TextView
android:text="@string/source"
android:gravity="right|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/current_source"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceSmall" />
</TableRow>
<TableRow>
<TextView
android:text="@string/latitude"
android:gravity="right|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/current_latitude"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceSmall" />
</TableRow>
<TableRow>
<TextView
android:text="@string/longitude"
android:gravity="right|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/current_longitude"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceSmall" />
</TableRow>
<TableRow>
<TextView
android:text="@string/accuracy"
android:gravity="right|center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
android:paddingRight="10dip" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/current_accuracy"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceSmall" />
</TableRow>
</TableLayout>
<View
android:layout_width="fill_parent"
android:background="@android:drawable/divider_horizontal_bright"
android:layout_marginBottom="10dip"
android:layout_marginTop="10dip"
android:layout_height="4dip" />
<Button
android:id="@+id/set_location"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/set_location" />
<Button
android:id="@+id/close_location_window"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/close" />
</LinearLayout>
</ScrollView>
2-列表.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="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:longClickable="true"
android:layout_weight="1" />
<ScrollView
android:id="@android:id/empty"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true">
<TextView
android:id="@+id/emptyText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/empty_msg"
android:textSize="20sp"
android:textColor="?android:attr/textColorSecondary"
android:paddingLeft="10dip"
android:paddingRight="10dip"
android:paddingTop="10dip"
android:lineSpacingMultiplier="0.92" />
</ScrollView>
</LinearLayout>
不好意思。。。太长
我想我明白你想做什么。下面是使用 ListView 的文本筛选器的示例：
public class Example extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout layout = new LinearLayout(this);
ListView list = new ListView(this);
layout.addView(list);
setContentView(layout);
String[] array = {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, array);
list.setAdapter(adapter);
list.setTextFilterEnabled(true);
}
}
您需要通过长按菜单按钮打开键盘。
遗憾的是，此功能完全不足以对来自 CursorAdapter 的结果集进行排序。事实上，当我将TextFilter绑定到SimpleCursorAdapter时，它甚至没有响应。
溶液：
这是一种基本方法，请尝试添加编辑文本和按钮。 假设您要按名称对位置进行排序。 当用户单击该按钮时，您可以使用 EditText 中的内容查询数据库，如下所示：
db.query(TABLE_LOCATIONS, PROJECTION_LOCATIONS,
FIELD_LOCATIONS_NAME " LIKE '%?%'", editTextString,
null, null, FIELD_LOCATIONS_NAME);
当然，editTextString是用户从EditText输入的。现在只需将从数据库返回的这个新游标设置为适配器，如下所示：
adapter.changeCursor(newCursor);
您将不得不使用相同的方法来按名称进行排序，而不仅仅是名称，但这是一般的想法。设计明智，您可以将搜索 EditText 和 Button 移动到 PopUpWindow 中，或者您可以使用 TextWatcher 将每个新字母键入到 EditText 中来重新查询数据库而不是按钮;有许多不同的方法。希望有帮助。