创建PeopleProvider.java:
package com.example.ch9;
import com.example.db.DbHelper;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.text.TextUtils;
public class PeopleProvider extends ContentProvider {
private static final int ITEMS = 1;
private static final int ITEM_ID = 2;
public static final String DbName = "Db_People";
public static final String TableName = "tb_people";
DbHelper dbhelper ;
SQLiteDatabase db;
public static final String CONTENT_ITEMS_TYPE = "vnd.android.cursor.items/com.example.ch94.Db_People";
public static final String CONTENT_ITEMID_TYPE = "vnd.android.cursor.itemid/com.example.ch94.Db_People";
public static final Uri CONTENT_URI = Uri.parse("content://com.example.ch94.Db_People/tb_people");
private static final UriMatcher sMatcher;
static{
sMatcher = new UriMatcher(UriMatcher.NO_MATCH);
sMatcher.addURI("com.example.ch94.Db_People", TableName, ITEMS);
sMatcher.addURI("com.example.ch94.Db_People", TableName+"/#", ITEM_ID);
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
db = dbhelper.getWritableDatabase();
int count = 0;
switch(sMatcher.match(uri)){
case ITEMS:
count = db.delete("tb_people", selection, selectionArgs);
break;
case ITEM_ID:
String id = uri.getPathSegments().get(1);
count = db.delete("tb_people", "_ID="+id+(!TextUtils.isEmpty("_ID=?")?"AND("+selection+')':""), selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI"+uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
@Override
public String getType(Uri uri) {
switch(sMatcher.match(uri)){
case ITEMS:
return CONTENT_ITEMS_TYPE;
case ITEM_ID:
return CONTENT_ITEMID_TYPE;
default:
throw new IllegalArgumentException("Unknown URI"+uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
db = dbhelper.getWritableDatabase();
long rowId ;
if(sMatcher.match(uri)!=ITEMS){
throw new IllegalArgumentException("Unknown URI"+uri);
}
rowId = db.insert("tb_people", "_ID", values);
if(rowId>0){
Uri noteUri = ContentUris.withAppendedId(CONTENT_URI, rowId);
getContext().getContentResolver().notifyChange(noteUri, null);
return noteUri;
}
throw new IllegalArgumentException("Unknown URI"+uri);
}
@Override
public boolean onCreate() {
dbhelper = new DbHelper(this.getContext(),"Db_People",null,1);
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
db = dbhelper.getReadableDatabase();
Cursor c;
switch(sMatcher.match(uri)){
case ITEMS:
c = db.query("tb_people", projection, selection, selectionArgs, null, null, null);
break;
case ITEM_ID:
String id = uri.getPathSegments().get(1);
c = db.query("tb_people", projection, "_ID="+id+(!TextUtils.isEmpty(selection)?"AND("+selection+')':""), selectionArgs, null, null, sortOrder);
break;
default:
throw new IllegalArgumentException("Unknown URI"+uri);
}
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
db = dbhelper.getWritableDatabase();
int count = 0;
switch(sMatcher.match(uri)){
case ITEMS:
count = db.update("tb_people", values, selection, selectionArgs);
break;
case ITEM_ID:
String id = uri.getPathSegments().get(1);
count = db.update("tb_people", values, "_ID="+id+(!TextUtils.isEmpty(selection)?"AND("+selection+')':""), selectionArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI"+uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
}
创建主活动类SqlMainActivity.java:
package com.example.ch94;
import com.example.baseexample.R;
import com.example.db.DbHelper;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
public class SqlMainActivity extends Activity {
private ListView list_people;
private ContentResolver contentResolver;
private Uri CONTENT_URI = Uri.parse("content://com.example.ch94.Db_People/tb_people");
// private DbHelper dbhelper;
// private SQLiteDatabase db;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.ch9_sqlmain);
contentResolver = this.getContentResolver();
list_people = (ListView)findViewById(R.id.list_people);
// dbhelper = new DbHelper(this, "Db_People", null, 1);
// db = dbhelper.getReadableDatabase();
Cursor c = contentResolver.query(CONTENT_URI, new String[]{"_id","name","phone","mobile","email"}, null, null, null);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.ch9_peoplelist, c, new String[]{"_id","name","phone","mobile","email"}, new int[]{R.id.id,R.id.name,R.id.phone,R.id.mobile,R.id.email});
this.list_people.setAdapter(adapter);
this.registerForContextMenu(list_people);
}
public boolean onCreateOptionsMenu(Menu menu){
menu.add(Menu.NONE,Menu.FIRST+1,1,"添加").setIcon(android.R.drawable.ic_menu_add);
menu.add(Menu.NONE,Menu.FIRST+1,2,"退出").setIcon(android.R.drawable.ic_menu_delete);
return true;
}
public boolean onOptionsItemSelected(MenuItem item){
switch(item.getItemId()){
case Menu.FIRST+1:
Intent intent = new Intent();
intent.setClass(SqlMainActivity.this, AddPeopleActivity.class);
startActivity(intent);
break;
case Menu.FIRST+2:finish();
break;
}
return super.onOptionsItemSelected(item);
}
public void onCreateContextMenu(ContextMenu menu,View v,ContextMenuInfo menuInfo){
menu.setHeaderIcon(R.drawable.ic_launcher);
menu.add(0,3,0,"修改");
menu.add(0, 4, 0, "删除");
}
public boolean onContextItemSelected(MenuItem item){
AdapterContextMenuInfo menuInfo = (AdapterContextMenuInfo)item.getMenuInfo();
switch(item.getItemId()){
case 3:
String name=((TextView)menuInfo.targetView.findViewById(R.id.name)).getText().toString();
String phone=((TextView)menuInfo.targetView.findViewById(R.id.phone)).getText().toString();
String mobile=((TextView)menuInfo.targetView.findViewById(R.id.mobile)).getText().toString();
String email=((TextView)menuInfo.targetView.findViewById(R.id.email)).getText().toString();
Intent intent = new Intent();
intent.setClass(SqlMainActivity.this, AddPeopleActivity.class);
Bundle bundle = new Bundle();
bundle.putLong("id", menuInfo.id);
bundle.putString("name", name);
bundle.putString("phone", phone);
bundle.putString("mobile", mobile);
bundle.putString("email", email);
intent.putExtras(bundle);
startActivity(intent);
break;
case 4:
contentResolver.delete(CONTENT_URI, "_ID=?", new String[]{menuInfo.id+""});
// dbhelper = new DbHelper(this,"Db_People",null,1);
// db = dbhelper.getWritableDatabase();
// db.delete("tb_people", "_id=?", new String[]{menuInfo.id+""});
break;
}
return true;
}
}
创建添加数据的活动类AddPeopleActivity.java:
package com.example.ch94;
import com.example.baseexample.R;
import com.example.db.DbHelper;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class AddPeopleActivity extends Activity {
private EditText edt_name;
private EditText edt_phone;
private EditText edt_mobile;
private EditText edt_email;
private Button bt_save;
private ContentResolver contentResolver;
private Uri CONTENT_URI = Uri.parse("content://com.example.ch94.Db_People/tb_people");
String name,phone,mobile,email;
// DbHelper dbhelper;
// SQLiteDatabase db;
Bundle bundle;
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.ch9_addpeople);
contentResolver = this.getContentResolver();
edt_name=(EditText)findViewById(R.id.edt_name);
edt_phone=(EditText)findViewById(R.id.edt_phone);
edt_mobile=(EditText)findViewById(R.id.edt_mobile);
edt_email=(EditText)findViewById(R.id.edt_email);
bt_save = (Button)findViewById(R.id.bt_save);
bundle = this.getIntent().getExtras();
if(bundle!=null){
edt_name.setText(bundle.getString("name"));
edt_phone.setText(bundle.getString("phone"));
edt_mobile.setText(bundle.getString("mobile"));
edt_email.setText(bundle.getString("email"));
}
bt_save.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
name = edt_name.getText().toString();
phone = edt_phone.getText().toString();
mobile = edt_mobile.getText().toString();
email = edt_email.getText().toString();
ContentValues value = new ContentValues();
value.put("name", name);
value.put("phone", phone);
value.put("mobile", mobile);
value.put("email", email);
// DbHelper dbhelper = new DbHelper(AddPeopleActivity.this,"Db_People",null,1);
// SQLiteDatabase db = dbhelper.getWritableDatabase();
long status;
if(bundle!=null){
status = contentResolver.update(CONTENT_URI, value, "_ID=?", new String[]{bundle.getLong("id")+""});
}else{
Uri uri2 = contentResolver.insert(CONTENT_URI, value);
if(uri2!=null){
status =1;
}else{
status = -1;
}
// status = db.insert("tb_people", null, value);
}
if(status!=-1){
Toast.makeText(AddPeopleActivity.this, "保存成功", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(AddPeopleActivity.this, "保存失败", Toast.LENGTH_LONG).show();
}
}
});
}
}
最后,在AndroidManifest.xml增加:
<provider android:name="com.example.ch9.PeopleProvider" android:authorities="com.example.ch94.Db_People"/>
转载于:https://my.oschina.net/u/2552902/blog/543941