Android文本自动提示框的简单应用实例

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Android文本自动提示框的简单应用实例

2018年04月18日 ⁄ 综合 ⁄ 共 17118字 ⁄ 字号小中大 ⁄ 评论关闭

实现的功能：

<1> 使用AutoCompleteTextView和MultiAutoCompleteTextView实现对绑定字符数组的提示；

<2> 使用AutoCompleteTextView和MultiAutoCompleteTextView实现对从手机联系人读取的姓名进行提示；

<3> 实现在文本框输入字符后，将输入的字符存入数据库中，下次再输入字符时，将从数据库中读取保存的字符串进行提示，保存的字符串不能重复，在数据库中每次插入时进行判断，如果已存在于数据库中，则更新保存的时间，如果不存在，则重新插入，且可以设置数据库中最多能够保存多少条数据，当达到该最大值时，没插入一条数据，同事删除数据库保存时间最久的那一条数据。

完整代码如下：

strings.xml

------------------------------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">文本自动提示</string>
    <string name="single">输入内容自动完成文本框</string>
    <string name="multi">多次输入内容自动完成文本框</string>
    <string name="normal_single">自定义数组提示:</string>
    <string name="normal_multi">自定义数组提示:</string>
    <string name="contacts_single">提示联系人:</string>
    <string name="contacts_multi">提示联系人:</string>
    <string name="self_signle">自动提示输入的字符</string>
    <string name="self_text">提示已输入的字符:</string>
    <string name="save">保存</string>
</resources>

------------------------------------------------------------------------------

main.xml

------------------------------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/single" />
<LinearLayout
  android:orientation="horizontal"
  android:layout_width="match_parent"
  android:layout_height="wrap_content" >

------------------------------------------------------------------------------

AndroidManifest.xml

------------------------------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="cn.am321.ddc.autocomplete"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
    <uses-library android:name="android.test.runner" />
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
<provider android:name=".db.DBProvider" android:authorities="cn.am321.ddc.autocomplete"/>
    </application>
    <instrumentation android:name="android.test.InstrumentationTestRunner"
  android:targetPackage="cn.am321.ddc.autocomplete" />

    <uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
</manifest>

------------------------------------------------------------------------------

MainActivity.java

------------------------------------------------------------------------------

public class MainActivity extends Activity {
private AutoCompleteTextView autoCompleteTextView1;
private AutoCompleteTextView autoCompleteTextView2;
private AutoCompleteTextView autoCompleteTextView3;
private MultiAutoCompleteTextView multiAutoCompleteTextView1;
private MultiAutoCompleteTextView multiAutoCompleteTextView2;
private Button button;
private ArrayAdapter<String> adapter3;

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  autoCompleteTextView1 = (AutoCompleteTextView) this.findViewById(R.id.single1);
  autoCompleteTextView2 = (AutoCompleteTextView) this.findViewById(R.id.single2);
  autoCompleteTextView3 = (AutoCompleteTextView) this.findViewById(R.id.single3);

multiAutoCompleteTextView1 = (MultiAutoCompleteTextView) this.findViewById(R.id.multi1);
multiAutoCompleteTextView2 = (MultiAutoCompleteTextView) this.findViewById(R.id.multi2);

button = (Button) this.findViewById(R.id.button);

  ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, COUNTRIES);
  autoCompleteTextView1.setAdapter(adapter);
  multiAutoCompleteTextView1.setAdapter(adapter);
  multiAutoCompleteTextView1.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

  ContentResolver content = getContentResolver();
  Cursor cursor = content.query(Contacts.People.CONTENT_URI,//
    PEOPLE_PROJECTION, null, null, Contacts.People.DEFAULT_SORT_ORDER);
  ContactListAdapter adapter2 = new ContactListAdapter(this, cursor);
  // adapter2.notifyDataSetChanged();
  autoCompleteTextView2.setAdapter(adapter2);
  multiAutoCompleteTextView2.setAdapter(adapter2);
  multiAutoCompleteTextView2.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

  adapter3 = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, DBOperation.getAllMessages(this));

  autoCompleteTextView3.setAdapter(adapter3);
  // multiAutoCompleteTextView2.setAdapter(adapter2);
  // multiAutoCompleteTextView2.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

button.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    final String message = autoCompleteTextView3.getText().toString();
    if (!"".equals(message) && message != null) {
     new Thread(new Runnable() {
      public void run() {
       DBOperation.addMessage(MainActivity.this, message);
       Message msg = new Message();
       myHandler.sendMessage(msg);
      }
     }).start();
    }
   }
  });
}

Handler myHandler = new Handler() {

  @Override
  public void handleMessage(Message msg) {
   adapter3 = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_dropdown_item_1line, DBOperation.getAllMessages(MainActivity.this));
   autoCompleteTextView3.setAdapter(adapter3);
   super.handleMessage(msg);
  }
};

public static class ContactListAdapter extends CursorAdapter {
private ContentResolver mContentResolver;

  public ContactListAdapter(Context context, Cursor c) {
   super(context, c);
   mContentResolver = context.getContentResolver();
  }

  @Override
  public View newView(Context context, Cursor cursor, ViewGroup parent) {
   final LayoutInflater inflater = LayoutInflater.from(context);
   final TextView view = (TextView) inflater.inflate(android.R.layout.simple_dropdown_item_1line, parent, false);
   view.setText(cursor.getString(5));
   return view;
  }

  @Override
  public void bindView(View view, Context context, Cursor cursor) {
   ((TextView) view).setText(cursor.getString(5));
  }

  @Override
  public CharSequence convertToString(Cursor cursor) {
   return cursor.getString(5);
  }

  @Override
  public Cursor runQueryOnBackgroundThread(CharSequence constraint) {
   if (getFilterQueryProvider() != null) {
    return getFilterQueryProvider().runQuery(constraint);
   }
   StringBuilder buffer = null;
   String[] args = null;
   if (constraint != null) {
    buffer = new StringBuilder();
    buffer.append("UPPER(");
    buffer.append(Contacts.ContactMethods.NAME);
    buffer.append(") GLOB ?");
    args = new String[] { constraint.toString().toUpperCase() + "*" };
   }
   return mContentResolver.query(Contacts.People.CONTENT_URI, PEOPLE_PROJECTION,//
     buffer == null ? null : buffer.toString(), args, Contacts.People.DEFAULT_SORT_ORDER);
  }
}

private static final String[] PEOPLE_PROJECTION = new String[] { Contacts.People._ID, Contacts.People.PRIMARY_PHONE_ID, Contacts.People.TYPE, Contacts.People.NUMBER,
Contacts.People.LABEL, Contacts.People.NAME, };
static final String[] COUNTRIES = new String[] { "Afghanistan", "Albania", "Algeria", "American Samoa", "Andorra };
}

------------------------------------------------------------------------------

DBContext.java

------------------------------------------------------------------------------

public final class DBContext {
public static final String AUTHORITY = "cn.am321.ddc.autocomplete";
public static final class Messages implements BaseColumns{
  public static final String TABLE_NAME = "messages";
  public static final Uri CONTENT_URI = Uri.parse("content://"+ AUTHORITY +"/messages");
  public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd."+AUTHORITY+"."+TABLE_NAME;
  public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd."+AUTHORITY+"."+TABLE_NAME+"item";
  public static final String MESSAGE_TIMESTAMP = "message_timestamp";
  public static final String MESSAGE_STRING = "message_string";
}
}

------------------------------------------------------------------------------

DBProvider.java

------------------------------------------------------------------------------

public class DBProvider extends ContentProvider {
private static final String DATABASE_NAME = "ddc.db";
private static final int DATABASE_VERSION = 1;

private static final int MESSAGES = 1;
private static final int MESSAGES_ID = 2;

private DatabaseHelper mDBHelper;
private static final UriMatcher uriMatcher;
static {
  uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
  uriMatcher.addURI(DBContext.AUTHORITY, Messages.TABLE_NAME, MESSAGES);
  uriMatcher.addURI(DBContext.AUTHORITY, Messages.TABLE_NAME + "/#", MESSAGES_ID);
}

private static class DatabaseHelper extends SQLiteOpenHelper {
private static DatabaseHelper mInstance = null;

  public DatabaseHelper(Context context) {
   super(context, DATABASE_NAME, null, DATABASE_VERSION);
  }

  public static DatabaseHelper getInstance(Context context) {
   if (mInstance == null) {
    mInstance = new DatabaseHelper(context);
   }
   return mInstance;
  }

  @Override
  public void onCreate(SQLiteDatabase db) {
   db.execSQL("CREATE TABLE IF NOT EXISTS " + DBContext.Messages.TABLE_NAME //
     + "("//
     //+ DBContext.Messages._ID + " INTEGER PRIMARY KEY,"//
     + DBContext.Messages.MESSAGE_TIMESTAMP + " TEXT,"//
     + DBContext.Messages.MESSAGE_STRING + " TEXT"//
     + ");");
  }

  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
   db.execSQL("DROP TABLE IF EXISTS " + DBContext.Messages.TABLE_NAME + ";");
   onCreate(db);
  }

}

@Override
public boolean onCreate() {
mDBHelper = DatabaseHelper.getInstance(this.getContext());
return true;
}

@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
  SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
  switch (uriMatcher.match(uri)) {
  case MESSAGES:
   qb.setTables(Messages.TABLE_NAME);
   break;
  case MESSAGES_ID:
   qb.setTables(Messages.TABLE_NAME);
   qb.appendWhere(Messages._ID + "=" + uri.getLastPathSegment());
   break;
  default:
   throw new IllegalArgumentException("Unknown URI " + uri);
  }
  SQLiteDatabase db = mDBHelper.getReadableDatabase();
  Cursor cursor = qb.query(db, projection, selection, selectionArgs, null, null, sortOrder);
  cursor.setNotificationUri(this.getContext().getContentResolver(), uri);
  return cursor;
}

@Override
public String getType(Uri uri) {
  switch (uriMatcher.match(uri)) {
  case MESSAGES:
   return Messages.CONTENT_TYPE;
  case MESSAGES_ID:
   return Messages.CONTENT_ITEM_TYPE;
  default:
   throw new IllegalArgumentException("Unknown URI " + uri);
  }
}

@Override
public Uri insert(Uri uri, ContentValues values) {
  String table_name = "";
  String columnHack = "";
  Uri CONTENT_URI;
  switch (uriMatcher.match(uri)) {
  case MESSAGES:
  case MESSAGES_ID:
   table_name = Messages.TABLE_NAME;
   columnHack = Messages.TABLE_NAME;
   CONTENT_URI = Messages.CONTENT_URI;
   break;
  default:
   throw new IllegalArgumentException("Unknown URI " + uri);
  }
  SQLiteDatabase qb = mDBHelper.getWritableDatabase();
  long rowId = qb.insert(table_name, columnHack, values);
  if (rowId > 0) {
   Uri noteUri = ContentUris.withAppendedId(CONTENT_URI, rowId);
   this.getContext().getContentResolver().notifyChange(noteUri, null);
   return noteUri;
  }
  throw new SQLException("Failed to insert row into " + uri);
}

@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
  SQLiteDatabase db = mDBHelper.getWritableDatabase();
  int count;
  String Id;
  switch (uriMatcher.match(uri)) {
  case MESSAGES:
   count = db.delete(Messages.TABLE_NAME, selection, selectionArgs);
   break;
  case MESSAGES_ID:
   Id = uri.getPathSegments().get(1);
   count = db.delete(Messages.TABLE_NAME, Messages._ID + "=" + Id + (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""), selectionArgs);
   break;
  default:
   throw new IllegalArgumentException("Unknown URI " + uri);
  }
  getContext().getContentResolver().notifyChange(uri, null);
  return count;
}

@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
  SQLiteDatabase db = mDBHelper.getWritableDatabase();
  int count;
  String Id;
  switch (uriMatcher.match(uri)) {
  case MESSAGES:
   count = db.update(Messages.TABLE_NAME, values, selection, selectionArgs);
   break;
  case MESSAGES_ID:
   Id = uri.getPathSegments().get(1);
   count = db.update(Messages.TABLE_NAME, values, Messages._ID + "=" + Id + (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""), selectionArgs);
   break;
  default:
   throw new IllegalArgumentException("Unknown URI " + uri);
  }
  getContext().getContentResolver().notifyChange(uri, null);
  return count;
}

}

------------------------------------------------------------------------------

DBOperation.java

------------------------------------------------------------------------------

public class DBOperation {
private static final String TAG = "DBOperation";
private static final int MAX_ITEM = 200;
public static void addMessage(Context context, String message) {
  ContentResolver contentResolver = context.getContentResolver();
  Uri uri = DBContext.Messages.CONTENT_URI;
  ContentValues contentValues = new ContentValues();

  String[] projection = new String[] { "message_string" };
  String selection = DBContext.Messages.MESSAGE_STRING + "=?";
  Cursor cursor = contentResolver.query(uri, projection, selection, new String[] { message }, null);
  //cursor.moveToFirst();
  if (!cursor.moveToFirst()) {
   contentValues.put(Messages.MESSAGE_STRING, message);
   contentValues.put(Messages.MESSAGE_TIMESTAMP, String.valueOf(System.currentTimeMillis()));
   contentResolver.insert(uri, contentValues);

   if (contentResolver.query(uri, projection, null, null, null).getCount() > MAX_ITEM) {
    projection = new String[] { "min(message_timestamp) as min_timestamp" };
    cursor = contentResolver.query(uri, projection, null, null, null);
    cursor.moveToFirst();
    String min_timestamp = cursor.getString(0);
    String where = DBContext.Messages.MESSAGE_TIMESTAMP + "=?";
    contentResolver.delete(uri, where, new String[] { min_timestamp });
   }
  } else {
   String where = DBContext.Messages.MESSAGE_STRING + "=?";
   message = cursor.getString(cursor.getColumnIndex(DBContext.Messages.MESSAGE_STRING));
   contentValues.clear();
   contentValues.put(Messages.MESSAGE_TIMESTAMP, String.valueOf(System.currentTimeMillis()));
   contentResolver.update(uri, contentValues, where, new String[] { message });
  }
}

public static ArrayList<String> getAllMessages(Context context) {
  ContentResolver contentResolver = context.getContentResolver();
  Uri uri = DBContext.Messages.CONTENT_URI;
  String[] messages = new String[] { "message_string" };
  Cursor cursor = contentResolver.query(uri, messages, null, null, null);
  cursor.moveToFirst();
  ArrayList<String> messagesList = new ArrayList<String>();
  while (!cursor.isAfterLast()) {
   messagesList.add(cursor.getString(cursor.getColumnIndexOrThrow(DBContext.Messages.MESSAGE_STRING)));
   cursor.moveToNext();
  }
  cursor.close();
  return messagesList;
}
}

【上篇】本讲内容：Android手机摄像头编程入门
【下篇】Android中使用WebView, WebChromeClient和WebViewClient加载网页

作者: jeux

该日志由 jeux 于6年前发表在综合分类下，最后更新于 2018年04月18日.
转载请注明: Android文本自动提示框的简单应用实例 | 学步园 +复制链接

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Android文本自动提示框的简单应用实例

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