ContentProvider 操作类
import java.util.Calendar;
import java.util.HashMap;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.content.res.Resources;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
import com.eoeAndroid.contentProvider.Diary.DiaryColumns;
//继承自ContentProvider
public class DiaryContentProvider extends ContentProvider {
private static final String DATABASE_NAME = "database";
private static final int DATABASE_VERSION = 3;
private static final String DIARY_TABLE_NAME = "diary";
private static final int DIARIES = 1;
private static final int DIARY_ID = 2;
private static final UriMatcher sUriMatcher; //URi 操作类
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
Log.i("jinyan", "DATABASE_VERSION=" + DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
Log.i("jinyan", "onCreate(SQLiteDatabase db)");
String sql = "CREATE TABLE " + DIARY_TABLE_NAME + " ("
+ DiaryColumns._ID + " INTEGER PRIMARY KEY,"
+ DiaryColumns.TITLE + " TEXT," + DiaryColumns.BODY
+ " TEXT," + DiaryColumns.CREATED + " TEXT" + ");";
//
sql ="CREATE TABLE " + DIARY_TABLE_NAME + " ("
+ DiaryColumns._ID + " INTEGER PRIMARY KEY,"
+ DiaryColumns.TITLE + " varchar(255)," + DiaryColumns.BODY
+ " TEXT," + DiaryColumns.CREATED + " TEXT" + ");";
//
Log.i("jinyan", "sql="+sql);
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.i("jinyan",
" onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)="
+ newVersion);
db.execSQL("DROP TABLE IF EXISTS diary");
onCreate(db);
}
}
private DatabaseHelper mOpenHelper;
static {
sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
sUriMatcher.addURI(Diary.AUTHORITY, "diaries", DIARIES);//添加解析规则1
sUriMatcher.addURI(Diary.AUTHORITY, "diaries/#", DIARY_ID);//添加解析规则2
}
@Override
public boolean onCreate() {
mOpenHelper = new DatabaseHelper(getContext());
return true;
}
//以下是重载实现接口方法
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
switch (sUriMatcher.match(uri)) {
case DIARIES:
qb.setTables(DIARY_TABLE_NAME);
break;
case DIARY_ID:
qb.setTables(DIARY_TABLE_NAME);
qb.appendWhere(DiaryColumns._ID + "="
+ uri.getPathSegments().get(1));
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
String orderBy;
if (TextUtils.isEmpty(sortOrder)) {
orderBy = Diary.DiaryColumns.DEFAULT_SORT_ORDER;
} else {
orderBy = sortOrder;
}
SQLiteDatabase db = mOpenHelper.getReadableDatabase();
Cursor c = qb.query(db, projection, selection, selectionArgs, null,
null, orderBy);
return c;
}
@Override
public String getType(Uri uri) {
switch (sUriMatcher.match(uri)) {
case DIARIES:
return DiaryColumns.CONTENT_TYPE;
case DIARY_ID:
return DiaryColumns.CONTENT_ITEM_TYPE;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues initialValues) {
if (sUriMatcher.match(uri) != DIARIES) {
throw new IllegalArgumentException("Unknown URI " + uri);
}
ContentValues values;
if (initialValues != null) {
values = new ContentValues(initialValues);
} else {
values = new ContentValues();
}
if (values.containsKey(Diary.DiaryColumns.CREATED) == false) {
values.put(Diary.DiaryColumns.CREATED, getFormateCreatedDate());
}
if (values.containsKey(Diary.DiaryColumns.TITLE) == false) {
Resources r = Resources.getSystem();
values.put(Diary.DiaryColumns.TITLE, r
.getString(android.R.string.untitled));
}
if (values.containsKey(Diary.DiaryColumns.BODY) == false) {
values.put(Diary.DiaryColumns.BODY, "");
}
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
long rowId = db.insert(DIARY_TABLE_NAME, DiaryColumns.BODY, values);
if (rowId > 0) {
Uri diaryUri = ContentUris.withAppendedId(
Diary.DiaryColumns.CONTENT_URI, rowId);
return diaryUri;
}
throw new SQLException("Failed to insert row into " + uri);
}
@Override
public int delete(Uri uri, String where, String[] whereArgs) {
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
String rowId = uri.getPathSegments().get(1);
return db
.delete(DIARY_TABLE_NAME, DiaryColumns._ID + "=" + rowId, null);
}
@Override
public int update(Uri uri, ContentValues values, String where,
String[] whereArgs) {
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
String rowId = uri.getPathSegments().get(1);
return db.update(DIARY_TABLE_NAME, values, DiaryColumns._ID + "="
+ rowId, null);
}
public static String getFormateCreatedDate() {
Calendar calendar = Calendar.getInstance();
String created = calendar.get(Calendar.YEAR) + "年"
+ calendar.get(Calendar.MONTH) + "月"
+ calendar.get(Calendar.DAY_OF_MONTH) + "日"
+ calendar.get(Calendar.HOUR_OF_DAY) + "时"
+ calendar.get(Calendar.MINUTE) + "分";
return created;
}
}
基本信息配置类
import android.net.Uri;
import android.provider.BaseColumns;
public final class Diary {
//这里的 AUTHORITY 要求是唯一，而且和Manifest当中provider标签的AUTHORITY内容一致
public static final String AUTHORITY = "com.ex09_2_contentprovider.diarycontentprovider";
private Diary() {}
/**
* Notes table
*/
public static final class DiaryColumns implements BaseColumns {
// This class cannot be instantiated
private DiaryColumns() {}
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/diaries");
public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.google.diary";
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.google.diary";
public static final String DEFAULT_SORT_ORDER = "created DESC";
public static final String TITLE = "title";
public static final String BODY = "body";
public static final String CREATED = "created";
}
}
主页面列表
public class ActivityMain extends ListActivity {
// 插入一条新纪录
public static final int MENU_ITEM_INSERT = Menu.FIRST;
// 编辑内容
public static final int MENU_ITEM_EDIT = Menu.FIRST + 1;
public static final int MENU_ITEM_DELETE = Menu.FIRST + 2;
private static final String[] PROJECTION = new String[] { DiaryColumns._ID,
DiaryColumns.TITLE, DiaryColumns.CREATED };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.diary_list);
Intent intent = getIntent();
if (intent.getData() == null) {
intent.setData(DiaryColumns.CONTENT_URI);
}
Cursor cursor = managedQuery(getIntent().getData(), PROJECTION, null,
null, DiaryColumns.DEFAULT_SORT_ORDER);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.diary_row, cursor, new String[] { DiaryColumns.TITLE,
DiaryColumns.CREATED }, new int[] { R.id.text1,
R.id.created });
setListAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, MENU_ITEM_INSERT, 0, R.string.menu_insert);
return true;
}
@Override
/*
* 在每一次menu生成的时候前都会调用这个方法，在这个方法里边可以动态的修改生成的menu。
*/
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
final boolean haveItems = getListAdapter().getCount() > 0; //是否有数据
if (haveItems) {
// 如果选中一个Item的话
if (getListView().getSelectedItemId() > 0) {
menu.removeGroup(1); //移除分组为一的选项也就是添加的那个按钮
Uri uri = ContentUris.withAppendedId(getIntent().getData(),
getSelectedItemId());
Intent intent = new Intent(null, uri); //跳转地址
menu.add(1, MENU_ITEM_EDIT, 1, "编辑内容").setIntent(intent);//添加两个按钮，组ID为1
menu.add(1, MENU_ITEM_DELETE, 1, "删除当前日记");
}
}else{
menu.removeGroup(1);
}
return true;
}
//点选后的回调事件。
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// 插入一条数据
case MENU_ITEM_INSERT:
Intent intent0 = new Intent(this, ActivityDiaryEditor.class);
intent0.setAction(ActivityDiaryEditor.INSERT_DIARY_ACTION);
intent0.setData(getIntent().getData());
startActivity(intent0);
return true;
// 编辑当前数据内容
case MENU_ITEM_EDIT:
Intent intent = new Intent(this, ActivityDiaryEditor.class);
intent.setData(item.getIntent().getData());
intent.setAction(ActivityDiaryEditor.EDIT_DIARY_ACTION);
startActivity(intent);
return true;
// 删除当前数据
case MENU_ITEM_DELETE:
Uri uri = ContentUris.withAppendedId(getIntent().getData(),
getListView().getSelectedItemId());
getContentResolver().delete(uri, null, null);
renderListView();
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Uri uri = ContentUris.withAppendedId(getIntent().getData(), id);
startActivity(new Intent(ActivityDiaryEditor.EDIT_DIARY_ACTION, uri));
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
//renderListView();
}
private void renderListView() {
Cursor cursor = managedQuery(getIntent().getData(), PROJECTION, null,
null, DiaryColumns.DEFAULT_SORT_ORDER);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.diary_row, cursor, new String[] { DiaryColumns.TITLE,
DiaryColumns.CREATED }, new int[] { R.id.text1,
R.id.created });
setListAdapter(adapter);
}
}
编辑页面
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.eoeAndroid.contentProvider.Diary.DiaryColumns;
public class ActivityDiaryEditor extends Activity {
private static final String TAG = "Diary";
public static final String EDIT_DIARY_ACTION = "com.ex09_2_contentProvider.ActivityDiaryEditor.EDIT_DIARY";
public static final String INSERT_DIARY_ACTION = "com.ex09_2_contentProvider.ActivityDiaryEditor.action.INSERT_DIARY";
/**
* 查询cursor时候，感兴趣的那些条例。
*/
private static final String[] PROJECTION = new String[] { DiaryColumns._ID, // 0
DiaryColumns.TITLE, DiaryColumns.BODY, // 1
};
private static final int STATE_EDIT = 0;
private static final int STATE_INSERT = 1;
private int mState;
private Uri mUri;
private Cursor mCursor;
private EditText mTitleText;
private EditText mBodyText;
private Button confirmButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTheme(android.R.style.Theme_Black);
final Intent intent = getIntent();
final String action = intent.getAction();
setContentView(R.layout.diary_edit);
mTitleText = (EditText) findViewById(R.id.title);
mBodyText = (EditText) findViewById(R.id.body);
confirmButton = (Button) findViewById(R.id.confirm);
if (EDIT_DIARY_ACTION.equals(action)) {// 编辑日记
mState = STATE_EDIT;
mUri = intent.getData();
mCursor = managedQuery(mUri, PROJECTION, null, null, null);
mCursor.moveToFirst();
String title = mCursor.getString(1);
mTitleText.setTextKeepState(title);
String body = mCursor.getString(2);
mBodyText.setTextKeepState(body);
setResult(RESULT_OK, (new Intent()).setAction(mUri.toString()));
setTitle("编辑日记");
} else if (INSERT_DIARY_ACTION.equals(action)) {// 新建日记
mState = STATE_INSERT;
setTitle("新建日记");
} else {
Log.e(TAG, "no such action error");
finish();
return;
}
confirmButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
if (mState == STATE_INSERT) {
insertDiary();
} else {
updateDiary();
}
Intent mIntent = new Intent();
setResult(RESULT_OK, mIntent);
finish();
}
});
}
private void insertDiary() {
String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString();
ContentValues values = new ContentValues();
values.put(Diary.DiaryColumns.CREATED, DiaryContentProvider
.getFormateCreatedDate());
values.put(Diary.DiaryColumns.TITLE, title);
values.put(Diary.DiaryColumns.BODY, body);
getContentResolver().insert(Diary.DiaryColumns.CONTENT_URI, values);
}
private void updateDiary() {
String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString();
ContentValues values = new ContentValues();
values.put(Diary.DiaryColumns.CREATED, DiaryContentProvider
.getFormateCreatedDate());
values.put(Diary.DiaryColumns.TITLE, title);
values.put(Diary.DiaryColumns.BODY, body);
getContentResolver().update(mUri, values,
null, null);
}
}
