DataContract.java
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package com.ContentProviders.StringContentProvider; import android.content.ContentResolver; import android.net.Uri; // Contract Class for accessing ContentResolver public final class DataContract { public static final String _ID = "_id"; public static final String DATA = "data"; public static final String DATA_TABLE = "data_table"; private static final Uri BASE_URI = Uri .parse("content://com.ContentProviders.StringContentProvider/"); // The URI for this table. public static final Uri CONTENT_URI = Uri.withAppendedPath(BASE_URI, DATA_TABLE); // Mime type for a directory of data items public static final String CONTENT_DIR_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE + "/StringContentProvider.data.text"; // Mime type for a single data item public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + "/StringContentProvider.data.text"; // All columns of this table public static final String[] ALL_COLUMNS = { _ID, DATA }; } |
DataRecord.java
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package com.ContentProviders.StringContentProvider; class DataRecord { private static int id; // Unique ID private final int _id; // Display Name private final String _data; DataRecord(String _data) { this._data = _data; this._id = id++; } String getData() { return _data; } int getID() { return _id; } } |
StringsContentProvider.java
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package com.ContentProviders.StringContentProvider; import android.content.ContentProvider; import android.content.ContentValues; import android.database.Cursor; import android.database.MatrixCursor; import android.net.Uri; import android.util.SparseArray; // Note: Currently, this data does not persist across device reboot public class StringsContentProvider extends ContentProvider { // Data storage private static final SparseArray<DataRecord> db = new SparseArray<DataRecord>(); @SuppressWarnings("unused") private static final String TAG = "StringsContentProvider"; // Delete some or all data items @Override public synchronized int delete(Uri uri, String selection, String[] selectionArgs) { int numRecordsRemoved = 0; // If last segment is the table name, delete all data items if (isTableUri(uri)) { numRecordsRemoved = db.size(); db.clear(); // If last segment is the digit, delete data item with that ID } else if (isItemUri(uri)) { Integer requestId = Integer.parseInt(uri.getLastPathSegment()); if (null != db.get(requestId)) { db.remove(requestId); numRecordsRemoved++; } } //return number of items deleted return numRecordsRemoved; } // Return MIME type for given uri @Override public synchronized String getType(Uri uri) { String contentType = DataContract.CONTENT_ITEM_TYPE; if (isTableUri(uri)) { contentType = DataContract.CONTENT_DIR_TYPE; } return contentType; } // Insert specified value into ContentProvider @Override public synchronized Uri insert(Uri uri, ContentValues value) { if (value.containsKey(DataContract.DATA)) { DataRecord dataRecord = new DataRecord(value.getAsString(DataContract.DATA)); db.put(dataRecord.getID(), dataRecord); // return Uri associated with newly-added data item return Uri.withAppendedPath(DataContract.CONTENT_URI, String.valueOf(dataRecord.getID())); } return null; } // return all or some rows from ContentProvider based on specified Uri // all other parameters are ignored @Override public synchronized Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { // Create simple cursor MatrixCursor cursor = new MatrixCursor(DataContract.ALL_COLUMNS); if (isTableUri(uri)) { // Add all rows to cursor for (int idx = 0; idx < db.size(); idx++) { DataRecord dataRecord = db.get(db.keyAt(idx)); cursor.addRow(new Object[] { dataRecord.getID(), dataRecord.getData() }); } } else if (isItemUri(uri)){ // Add single row to cursor Integer requestId = Integer.parseInt(uri.getLastPathSegment()); if (null != db.get(requestId)) { DataRecord dr = db.get(requestId); cursor.addRow(new Object[] { dr.getID(), dr.getData() }); } } return cursor; } // Ignore request @Override public synchronized int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { return 0; } // Initialize ContentProvider // Nothing to do in this case @Override public boolean onCreate() { return true; } // Does last segment of the Uri match a string of digits? private boolean isItemUri(Uri uri) { return uri.getLastPathSegment().matches("\\d+"); } // Is the last segment of the Uri the name of the data table? private boolean isTableUri(Uri uri) { return uri.getLastPathSegment().equals(DataContract.DATA_TABLE); } } |
main.xml
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<?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" /> </LinearLayout> |
list_layout.xml
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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:baselineAligned="true" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/idString" android:layout_marginLeft="10dip"></TextView> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/data" android:layout_marginLeft="10dip"></TextView> </LinearLayout> |