使用contentprovider实现的日记(转)
目录结构：
MyDiaryActivity.java
package com.zhang.myDiary; import com.zhang.myDiary.DiaryColumn.DiaryClmn; import android.app.Activity;
import android.app.ListActivity;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast; public class MyDiaryActivity extends ListActivity {
/** Called when the activity is first created. */ public static final int MENU_ITEM_INSERT = Menu.FIRST;
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[] { DiaryClmn._ID,
DiaryClmn.TITLE, DiaryClmn.CREATED }; @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main); setTitle("wyl的diary");
getWindow().setBackgroundDrawableResource(R.drawable.diarybg);
//getIntent(): Return the intent that started this activity.
Intent intent = getIntent(); if (intent.getData() == null) {
intent.setData(DiaryClmn.CONTENT_URI); } Cursor cursor = managedQuery(getIntent().getData(), PROJECTION, null,
null, DiaryClmn.DEFAULT_SORT_ORDER); SimpleCursorAdapter adapter = new SimpleCursorAdapter(
MyDiaryActivity.this, R.layout.mydiary_row, cursor,
new String[] { DiaryClmn.TITLE, DiaryClmn.CREATED }, new int[] {
R.id.text1, R.id.created }); setListAdapter(adapter);
} public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, MENU_ITEM_INSERT, 0, R.string.menu_insert);
menu.add(0, android.view.Menu.NONE, 1, R.string.menu_insert_2);
return true;
} /**
* This is called right before the menu is shown, every time it is shown
*/
public boolean onPrepareOptionsMenu(Menu menu) { super.onPrepareOptionsMenu(menu);
System.out.println("public boolean onPrepareOptionsMenu(Menu menu)");
myToast("public boolean onPrepareOptionsMenu(Menu menu) ");
/*
* getListAdapter()：Get the ListAdapter associated with this activity's
* ListView. getCount():How many items are in the data set represented
* by this Adapter.
*/ final boolean haveItems = getListAdapter().getCount() > 0;
myToast("getListAdapter().getCount()一共有" + getListAdapter().getCount()
+ "个");
if (haveItems) {
// getListView():Get the activity's list view widget.
if (getListView().getSelectedItemId() > 0) {
menu.removeGroup(1); Uri uri = ContentUris.withAppendedId(getIntent().getData(),
getListView().getSelectedItemId()); Intent intent = new Intent(null, uri);
// TODO 下面这行代码还不知道到底怎么用
menu.add(1, MENU_ITEM_EDIT, 1, "编辑内容").setIntent(intent);
menu.add(1, MENU_ITEM_DELETE, 1, "删除当前日记"); }
} else {
menu.removeGroup(1);
} return true;
} /**
* 封装 Toast()方法
*
* @param string
* 要显示的内容
*/
private void myToast(String string) {
Toast.makeText(this, string, 1000).show();
} public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) {
case MENU_ITEM_INSERT: Intent intent0 = new Intent(this, MyDiaryEdit.class);
intent0.setAction(MyDiaryEdit.INSERT_TEXT_ACTION);//设置action，
/*
* getIntent().getData(): Returns,The URI of the data this
* intent is targeting or null.
*/
intent0.setData(getIntent().getData());//intent设置URI
startActivity(intent0);
return true; case MENU_ITEM_EDIT: Intent intent1 = new Intent(this, MyDiaryEdit.class);
intent1.setAction(MyDiaryEdit.EDIT_TEXT_ACTION);
intent1.setData(item.getIntent().getData());
startActivity(intent1);
return true; case MENU_ITEM_DELETE:
Uri uri = ContentUris.withAppendedId(getIntent().getData(),
getListView().getSelectedItemId());
getContentResolver().delete(uri, null, null);
rewindView();
} return super.onOptionsItemSelected(item);
} protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
} @Override
protected void onListItemClick(ListView l, View v, int position, long id) {
//重要
//Returns: a new URI with the given ID appended to the end of the path
Uri uri = ContentUris.withAppendedId(getIntent().getData(), id);
/*
* new Intent.Intent(String action, Uri uri)这种用法还不太熟悉
* 系统会根据第一个参数(action)在清单文件中找对应的activity，如果对应为多个activity，
* 此时就会弹出一个dailog选择Activity
*/
startActivity(new Intent(MyDiaryEdit.EDIT_TEXT_ACTION, uri)); } private void rewindView() {
// TODO Auto-generated method stub
Cursor cursor = managedQuery(getIntent().getData(), PROJECTION, null,
null, DiaryClmn.DEFAULT_SORT_ORDER); SimpleCursorAdapter adapter = new SimpleCursorAdapter(
MyDiaryActivity.this, R.layout.mydiary_row, cursor,
new String[] { DiaryClmn.TITLE, DiaryClmn.CREATED }, new int[] {
R.id.text1, R.id.created }); setListAdapter(adapter); }
}
MyDiaryEdit.java
package com.zhang.myDiary; import com.zhang.myDiary.DiaryColumn.DiaryClmn; import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Paint;
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 android.widget.TextView;
import android.widget.Toast; public class MyDiaryEdit extends Activity { private static final String TAG = "Diary";
public static final String EDIT_TEXT_ACTION = "com.zhang.myDiary.MyDiaryEdit.EDIT_DIARY";
public static final String INSERT_TEXT_ACTION = "com.zhang.myDiary.MyDiaryEdit.action.INSERT_DIARY"; private static final String[] projection = new String[] { DiaryClmn._ID,
DiaryClmn.TITLE, DiaryClmn.BODY }; 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, modifyButton; protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTheme(android.R.style.Theme_Black);
//Return the intent that started this activity.
final Intent intent = getIntent();
final String action = intent.getAction();
setContentView(R.layout.mydiaryedit);//添加对应的layout
System.out.println("intent.getAction():"+intent.getAction());
myToast("intent.getAction():"+intent.getAction());
TextView wyl_tv = (TextView) findViewById(R.id.wyl_txt);
wyl_tv.setText("intent.getAction():"+intent.getAction()+", URI uri = intent.getData(): "+intent.getData());
mTitleText = (EditText) findViewById(R.id.title);
mBodyText = (EditText) findViewById(R.id.body); confirmButton = (Button) findViewById(R.id.confirm);
modifyButton = (Button) findViewById(R.id.modified); if (EDIT_TEXT_ACTION.equals(action)) {
mState = STATE_EDIT;
mTitleText.setEnabled(false);
mBodyText.setEnabled(false);//设置不可编辑
modifyButton.setVisibility(View.VISIBLE);
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(MyDiaryEdit.EDIT_TEXT_ACTION, mUri));
setTitle("编辑日记");
} else if (INSERT_TEXT_ACTION.equals(action)) {
mState = STATE_INSERT;
setTitle("新建日记");
} else { Log.e(TAG, "no such action error");
MyDiaryEdit.this.finish(); return;
} confirmButton.setOnClickListener(new MyBtnOnClickListen());
modifyButton.setOnClickListener(new MyBtnOnClickListen()); }
/**
* 封装 Toast()方法
*
* @param string 要显示的内容
*/
private void myToast(String string) {
Toast.makeText(this, string, 1000).show();
}
private class MyBtnOnClickListen implements Button.OnClickListener { @Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.confirm: if (mState == STATE_INSERT) {
insertDiary(); } else { // mTitleText.setEnabled(true);
// mBodyText.setEnabled(true);
updataDiary();
}
Intent intent = new Intent();
setResult(RESULT_OK, intent);
finish(); break; case R.id.modified:
mTitleText.setEnabled(true);
mBodyText.setEnabled(true);
break;
}
} private void insertDiary() {
// TODO Auto-generated method stub
ContentValues values = new ContentValues(); String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString(); values.put(DiaryClmn.CREATED,
MyDiaryContentProvider.getFormateCreatedDate());
values.put(DiaryClmn.TITLE, title);
values.put(DiaryClmn.BODY, body); getContentResolver().insert(DiaryClmn.CONTENT_URI, values); } private void updataDiary() {
// TODO Auto-generated method stub
ContentValues values = new ContentValues(); String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString(); values.put(DiaryClmn.CREATED,
MyDiaryContentProvider.getFormateCreatedDate());
values.put(DiaryClmn.TITLE, title);
values.put(DiaryClmn.BODY, body);
getContentResolver().update(mUri, values, null, null); } }
}
DiaryColumn.java
package com.zhang.myDiary; import java.net.URI; import android.net.Uri;
import android.provider.BaseColumns;
import android.text.StaticLayout; public class DiaryColumn
{ public static final String AUTHORITY = "com.zhang.myDiary.Myprovider"; public DiaryColumn()
{
} public static final class DiaryClmn implements BaseColumns
{ private DiaryClmn(){}; public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/diarias"); 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"; }
}
MyDiaryContentProvider.java
package com.zhang.myDiary; import java.util.Calendar;
import java.util.HashMap; import com.zhang.myDiary.DiaryColumn.DiaryClmn; import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;
import android.widget.TextView; public class MyDiaryContentProvider extends ContentProvider
{ private static final String DATABASE_NAME = "Diarydatabase";
private static final int DATABASE_VERSION = 1;
private static final String DIARY_TABLE_NAME = "diary"; private static final int DIARIES = 1;
private static final int DIARY_ID = 2; private MyDiaryBaseHalper myDiaryBaseHalper; private Context context; private static UriMatcher sUriMatcher;
private static HashMap<String,String>mHashMap; static{ sUriMatcher=new UriMatcher(UriMatcher.NO_MATCH);
sUriMatcher.addURI(DiaryColumn.AUTHORITY,"diarias",DIARIES);
sUriMatcher.addURI(DiaryColumn.AUTHORITY, "diarias/#",DIARY_ID); mHashMap=new HashMap<String, String>();
mHashMap.put(DiaryClmn._ID, DiaryClmn._ID);
mHashMap.put(DiaryClmn.TITLE, DiaryClmn.TITLE);
mHashMap.put(DiaryClmn.BODY,DiaryClmn.BODY);
mHashMap.put(DiaryClmn.CREATED, DiaryClmn.CREATED);
} public static class MyDiaryBaseHalper extends SQLiteOpenHelper{ public MyDiaryBaseHalper(Context context, String name, CursorFactory factory, int version)
{
super(context, name, factory, version);
// TODO Auto-generated constructor stub
} @Override
public void onCreate(SQLiteDatabase db)
{
// TODO Auto-generated method stub String sql="CREATE TABLE diary("+DiaryClmn._ID+" INTEGER PRIMARY KEY,"+DiaryClmn.TITLE+" TEXT,"+DiaryClmn.BODY+" TEXT,"+DiaryClmn.CREATED+" TEXT"+");"; db.execSQL(sql);
} @Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS diary");
onCreate(db);
} } @Override
public boolean onCreate()
{
// TODO Auto-generated method stub
myDiaryBaseHalper=new MyDiaryBaseHalper(getContext(), DATABASE_NAME, null,DATABASE_VERSION);
return true;
} @Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
{
// TODO Auto-generated method stub
SQLiteQueryBuilder dp=new SQLiteQueryBuilder(); switch (sUriMatcher.match(uri))
{
case DIARIES : dp.setTables(DIARY_TABLE_NAME);
dp.setProjectionMap(mHashMap);
break; case DIARY_ID:
dp.setTables(DIARY_TABLE_NAME);
dp.setProjectionMap(mHashMap);
dp.appendWhere(DiaryClmn._ID+"="+uri.getPathSegments().get(1));
break;
default:
throw new IllegalArgumentException("错误 的uri:"+uri);
} String olderBY;
if (TextUtils.isEmpty(sortOrder))
{
olderBY=DiaryClmn.DEFAULT_SORT_ORDER;
}else {
olderBY=sortOrder;
} SQLiteDatabase db=myDiaryBaseHalper.getReadableDatabase(); Cursor cursor=dp.query(db, projection, selection, selectionArgs, null,null, olderBY);
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
} @Override
public String getType(Uri uri)
{
// TODO Auto-generated method stub
switch (sUriMatcher.match(uri))
{
case DIARIES: return DiaryClmn.CONTENT_ITEM_TYPE;
case DIARY_ID: return DiaryClmn.CONTENT_ITEM_TYPE; default:
throw new IllegalArgumentException("Unknown URI " + uri);
} } @Override
public Uri insert(Uri uri, ContentValues values)
{
// TODO Auto-generated method stub
SQLiteDatabase db=myDiaryBaseHalper.getWritableDatabase(); long rwId=db.insert(DIARY_TABLE_NAME, DiaryClmn.BODY, values); if (rwId>0)
{
Uri rwIdUri=ContentUris.withAppendedId(DiaryClmn.CONTENT_URI, rwId); getContext().getContentResolver().notifyChange(rwIdUri,null); return rwIdUri;
}
throw new SQLException("Failed to insert row into " + uri);
} @Override
public int delete(Uri uri, String selection, String[] selectionArgs)
{
// TODO Auto-generated method stub
SQLiteDatabase db=myDiaryBaseHalper.getWritableDatabase(); String rwId=uri.getPathSegments().get(1); return db.delete(DIARY_TABLE_NAME, selection+"="+rwId,null);
} @Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs)
{
// TODO Auto-generated method stub SQLiteDatabase db=myDiaryBaseHalper.getWritableDatabase(); String rwId=uri.getPathSegments().get(1);
return db.update(DIARY_TABLE_NAME, values, DiaryClmn._ID+"="+rwId,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;
} }
main.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:layout_gravity="center_vertical"
android:orientation="vertical" > <ListView
android:id="@+id/android:list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:smoothScrollbar="true" /> <TextView
android:id="@+id/android:empty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textStyle="bold"
android:text="您还没有开始写日记呢!点击下边的Menu按钮开始写日记吧:)" /> </LinearLayout>
mydiary_row.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/row"
android:layout_width="fill_parent"
android:layout_height="fill_parent" > <TextView
android:id="@+id/text1"
android:layout_width="wrap_content"
android:layout_height="30px"
android:layout_marginTop="10dip"
android:maxWidth="200dip"
android:text="第一组第一项"
android:textColor="#000000"
android:textSize="22sp" /> <TextView
android:id="@+id/created"
android:layout_width="wrap_content"
android:layout_height="35px"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:layout_marginTop="10dip"
android:text="2012年4月2号"
android:textColor="#000000" /> </RelativeLayout>
mydiaryedit.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" > <LinearLayout
android:layout_width="0dip"
android:layout_height="0dip"
android:focusable="true"
android:focusableInTouchMode="true" /> <LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" > <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="2px"
android:text="@string/title" /> <EditText
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#000000" />
</LinearLayout> <LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" > <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/body" /> <EditText
android:id="@+id/body"
android:layout_width="fill_parent"
android:layout_height="wrap_content" android:singleLine="false"
android:textColor="#000000" /> <RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" > <Button
android:id="@+id/modified"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="click me!编辑"
android:visibility="invisible" >
</Button> <Button
android:id="@+id/confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/modified"
android:text=" 确定 " />
</RelativeLayout>
</LinearLayout> </LinearLayout>
strings.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" > <LinearLayout
android:layout_width="0dip"
android:layout_height="0dip"
android:focusable="true"
android:focusableInTouchMode="true" /> <LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" > <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="2px"
android:text="@string/title" /> <EditText
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#000000" />
</LinearLayout> <LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" > <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/body" /> <EditText
android:id="@+id/body"
android:layout_width="fill_parent"
android:layout_height="wrap_content" android:singleLine="false"
android:textColor="#000000" /> <RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" > <Button
android:id="@+id/modified"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="click me!编辑"
android:visibility="invisible" >
</Button> <Button
android:id="@+id/confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/modified"
android:text=" 确定 " />
</RelativeLayout>
</LinearLayout> </LinearLayout>
清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.zhang.myDiary"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk android:minSdkVersion="7" /> <application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<provider
android:name="MyDiaryContentProvider"
android:authorities="com.zhang.myDiary.Myprovider" /> <activity
android:name=".MyDiaryActivity"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.zhang.myDiary.MyDiaryEdit"
android:label="@string/title_diary"
android:theme="@android:style/Theme.Light" >
<intent-filter>
<action android:name="com.zhang.myDiary.MyDiaryEdit.EDIT_DIARY" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="vnd.android.cursor.item/vnd.google.diary"/>
</intent-filter>
<intent-filter>
<action android:name="com.zhang.myDiary.MyDiaryEdit.action.INSERT_DIARY" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="vnd.android.cursor.dir/vnd.google.diary" />
</intent-filter>
</activity>
</application> </manifest>
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