我想在Listview中实现一个SearchView，哪些项目来自数据库......我不知道是否必须使用EditText进行搜索，或者SearchView。如果我写了一些字母，在我的listView中只会显示以thouse字母开头的thouse项目。
MainActivity：
public class MyActivity extends Activity implements AppCompatCallback {
private AppCompatDelegate delegate;
Toolbar toolbar;
private android.support.v7.app.ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout drawerLayout;
private CustomCursorAdapter customAdapter;
private PersonDataBaseHelper databaseHelper;
private static final int ENTER_DATA_REQUEST_CODE = 1;
private ListView listView;
View LiniarLayout;
private static final String TAG = MyActivity.class.getSimpleName();
TextView myalbums ;
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
delegate = AppCompatDelegate.create(this, this);
//call the onCreate() of the AppCompatDelegate
delegate.onCreate(savedInstanceState);
//use the delegate to inflate the layout
delegate.setContentView(R.layout.main);
LiniarLayout = (View)findViewById(R.id.LiniarLayout);
//add the Toolbar
Toolbar toolbar= (Toolbar) findViewById(R.id.mytoolbar);
myalbums = (TextView) findViewById(R.id.myalbums);
delegate.setSupportActionBar(toolbar);
delegate.setTitle("Photo Album");
toolbar.getBackground().setAlpha(250);
drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
mDrawerToggle = new android.support.v7.app.ActionBarDrawerToggle(this , drawerLayout,R.string.drawer_open,R.string.drawer_close);
drawerLayout.setDrawerListener(mDrawerToggle);
databaseHelper = new PersonDataBaseHelper(this);
listView = (ListView) findViewById(R.id.list_data);
// Database query can be a time consuming task ..
// so its safe to call database query in another thread
// Handler, will handle this stuff for you <img src="http://s0.wp.com/wp-includes/images/smilies/icon_smile.gif?m=1129645325g" alt=":)" class="wp-smiley">
new Handler().post(new Runnable() {
@Override
public void run() {
customAdapter = new CustomCursorAdapter(MyActivity.this, databaseHelper.getAllData());
listView.setAdapter(customAdapter);
}
});
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(TAG, "cliker on item" + position);
drawerLayout.closeDrawer(LiniarLayout);
TextView name1 = (TextView) parent.getChildAt(position- listView.getFirstVisiblePosition()).findViewById(R.id.tv_person_name);
String name = name1.getText().toString();
Toast.makeText(MyActivity.this, "You selected ''"+name+" ''",Toast.LENGTH_SHORT).show();
String name2 = "/"+name+"/";
String numeAplicatie = "/PhotoAlbum/";
File filepath = Environment.getExternalStorageDirectory();
File dir = new File(filepath.getAbsolutePath()
+numeAplicatie +name2);
if(!dir.exists()) {
dir.mkdirs();
}
Intent myIntent = new Intent(MyActivity.this, AlbumActivity.class);
myIntent.putExtra("nameAlbum",name2);
myIntent.putExtra("nameAlbum2",name);
startActivity(myIntent);
}
});
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(final AdapterView<?> parent, View view, final int position, final long id) {
AlertDialog.Builder builder = new AlertDialog.Builder(MyActivity.this);
TextView name1 = (TextView) parent.getChildAt(position - listView.getFirstVisiblePosition()).findViewById(R.id.tv_person_name);
final String name = name1.getText().toString();
Toast.makeText(MyActivity.this ,"You selected"+" ''"+name+"''", LENGTH_SHORT).show();
builder.setCancelable(false);
builder.setMessage("Are you sure you want to delete ''" + name + "'' ?");
builder.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
databaseHelper.deleteSingleRow(id);
customAdapter.changeCursor(databaseHelper.getAllData());
dialog.dismiss();
Toast.makeText(MyActivity.this ,"''" +name+"''"+" deleted",Toast.LENGTH_SHORT).show();
File filepath = Environment.getExternalStorageDirectory();
File dir = new File(filepath.getAbsolutePath()
+"/"+name+"/" );
deleteDir(dir);
}
});
builder.setTitle("Delete Album");
AlertDialog dialog = builder.create();
dialog.show();
return true;
}
});
Field mDragger = null;//mRightDragger for right obviously
try {
mDragger = drawerLayout.getClass().getDeclaredField(
"mLeftDragger");
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
mDragger.setAccessible(true);
ViewDragHelper draggerObj = null;
try {
draggerObj = (ViewDragHelper) mDragger.get(drawerLayout);
} catch (IllegalAccessException e) {
e.printStackTrace();
}
Field mEdgeSize = null;
try {
mEdgeSize = draggerObj.getClass().getDeclaredField("mEdgeSize");
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
mEdgeSize.setAccessible(true);
int edge = 0;
try {
edge = mEdgeSize.getInt(draggerObj);
} catch (IllegalAccessException e) {
e.printStackTrace();
}
try {
mEdgeSize.setInt(draggerObj, edge * 10);
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (item.getItemId()){
case R.id.action_setting:
startActivityForResult(new Intent(this, EnterDataActivity.class), ENTER_DATA_REQUEST_CODE);
}
//noinspection SimplifiableIfStatement
if(id==android.R.id.home){
if(drawerLayout.isDrawerOpen(LiniarLayout)){
drawerLayout.closeDrawer(LiniarLayout);
}else{drawerLayout.openDrawer(LiniarLayout);
if(databaseHelper.getAllData()==null){
myalbums.setText("Create Album");
}
}
}
return super.onOptionsItemSelected(item);
}
public void onClickEnterData(View btnAdd) {
startActivityForResult(new Intent(this, EnterDataActivity.class), ENTER_DATA_REQUEST_CODE);
}
public static boolean deleteDir(File dir) {
if (dir.isDirectory()) {
String[] children = dir.list();
for (int i=0; i<children.length; i++) {
boolean success = deleteDir(new File(dir, children[i]));
if (!success) {
return false;
}
}
}
// The directory is now empty so delete it
return dir.delete();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == ENTER_DATA_REQUEST_CODE && resultCode == RESULT_OK) {
databaseHelper.insertData(data.getExtras().getString("tag_person_name"));
customAdapter.changeCursor(databaseHelper.getAllData());
drawerLayout.openDrawer(LiniarLayout);
}
}
@Override
public void onSupportActionModeStarted(ActionMode mode) {
}
@Override
public void onSupportActionModeFinished(ActionMode mode) {
}
@Nullable
@Override
public ActionMode onWindowStartingSupportActionMode(ActionMode.Callback callback) {
return null;
}
}
光标适配器：
public class CustomCursorAdapter extends CursorAdapter {
public CustomCursorAdapter(Context context, Cursor c) {
super(context, c);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// when the view will be created for first time,
// we need to tell the adapters, how each item will look
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View retView = inflater.inflate(R.layout.single_row_item, parent, false);
return retView;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// here we are setting our data
// that means, take the data from the cursor and put it in views
TextView textViewPersonName = (TextView) view.findViewById(R.id.tv_person_name);
textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));
}
}
我的DataBaseHelper：
public class PersonDataBaseHelper {
private static final String TAG = PersonDataBaseHelper.class.getSimpleName();
// database configuration
// if you want the onUpgrade to run then change the database_version
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "mydatabase.db";
// table configuration
private static final String TABLE_NAME = "person_table"; // Table name
private static final String PERSON_TABLE_COLUMN_ID = "_id"; // a column named "_id" is required for cursor
private static final String PERSON_TABLE_COLUMN_NAME = "person_name";
public static final String KEY_IMG = "image";
private DatabaseOpenHelper openHelper;
private SQLiteDatabase database;
// this is a wrapper class. that means, from outside world, anyone will communicate with PersonDatabaseHelper,
// but under the hood actually DatabaseOpenHelper class will perform database CRUD operations
public PersonDataBaseHelper(Context aContext) {
openHelper = new DatabaseOpenHelper(aContext);
database = openHelper.getWritableDatabase();
}
public void insertData (String aPersonName) {
// we are using ContentValues to avoid sql format errors
ContentValues contentValues = new ContentValues();
contentValues.put(PERSON_TABLE_COLUMN_NAME, aPersonName);
database.insert(TABLE_NAME, null, contentValues);
}
public Cursor getAllData () {
String buildSQL = "SELECT * FROM " + TABLE_NAME;
Log.d(TAG, "getAllData SQL: " + buildSQL);
return database.rawQuery(buildSQL,null);
}
public boolean deleteSingleRow(long rowId)
{
return database.delete(TABLE_NAME, PERSON_TABLE_COLUMN_ID + "=" + rowId, null) > 0;
}
// this DatabaseOpenHelper class will actually be used to perform database related operation
private class DatabaseOpenHelper extends SQLiteOpenHelper {
public DatabaseOpenHelper(Context aContext) {
super(aContext, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
// Create your tables here
String buildSQL = "CREATE TABLE " + TABLE_NAME + "( " + PERSON_TABLE_COLUMN_ID + " INTEGER PRIMARY KEY, " +
PERSON_TABLE_COLUMN_NAME + " TEXT )";
Log.d(TAG, "onCreate SQL: " + buildSQL);
sqLiteDatabase.execSQL(buildSQL);
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
// Database schema upgrade code goes here
String buildSQL = "DROP TABLE IF EXISTS " + TABLE_NAME;
Log.d(TAG, "onUpgrade SQL: " + buildSQL);
sqLiteDatabase.execSQL(buildSQL); // drop previous table
onCreate(sqLiteDatabase); // create the table from the beginning
}
}
}