android开发第六天ContentProvider数据共享

public class provider extends ContentProvider {
public final String TAG="provider";
/**
* 这个要和manifest.xml中的一致
*/
public static final String AUTHORITY = "com.nanguabing.contentprovider.myprovider";
private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
static {
try {
matcher.addURI(AUTHORITY, "insert", 1);
matcher.addURI(AUTHORITY, "delete/#", 2);
matcher.addURI(AUTHORITY, "update/#", 3);
matcher.addURI(AUTHORITY, "query/#", 4);
} catch (Exception e) {
e.printStackTrace();
}
}
CRUD mCRUD;

@Override
public boolean onCreate() {
mCRUD = new CRUD(this.getContext());
return false;
}

/**
* 查询操作
*/
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
int code = matcher.match(uri);
if (code == 4) {
return mCRUD.findAll();
}
return null;
}

@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
return null;
}

/**
* 插入操作
*/
public Uri insert(Uri uri, ContentValues values) {
// uri=content://com.nanguabing.contentprovider.myprovider/insert
int code = matcher.match(uri);
long id = -1;
if (code == 1) {
mCRUD.insert(values.getAsString("name"),values.getAsInteger("age"));
id=1;
} else {
Log.i(TAG, "this uri is invalid for insert!");
}
return ContentUris.withAppendedId(uri, id);
}

/**
* 删除操作
*/
public int delete(Uri uri, String selection, String[] selectionArgs) {
//delete:uri=content://cn.itcast.provider.customerprovider/delete/10
int code = matcher.match(uri);
if(code == 2){
mCRUD.delete((int) ContentUris.parseId(uri));
}
else{
Log.i(TAG, "this uri is invalid for delete!");
}
return 0;
}

/**
* 修改操作
*/
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
//update:uri=content://cn.itcast.provider.customerprovider/update/10
int code = matcher.match(uri);
if(code == 3){
mCRUD.update(values.getAsString("name"),values.getAsInteger("age"),values.getAsInteger("id"));
}
else{
Log.i(TAG, "this uri is invalid for update!");
}
return 0;
}

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nanguabing.contentprovider"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="8" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.nanguabing.contentprovider.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="com.nanguabing.contentprovider.provider"
android:authorities="com.nanguabing.contentprovider.myprovider"/>
</application>

</manifest>

public class MainActivity extends Activity {
String uri = "";
TextView mTV;
EditText mID, mName, mAge;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTV = (TextView) findViewById(R.id.textView1);
mID = (EditText) findViewById(R.id.editText1);
mName = (EditText) findViewById(R.id.editText2);
mAge = (EditText) findViewById(R.id.editText3);
}

public void onClick(View v) {
ContentResolver cr = this.getContentResolver();
ContentValues values = new ContentValues();
switch (v.getId()) {
case R.id.button1:
uri = "content://com.nanguabing.contentprovider.myprovider/insert";
values.put("name", mName.getText().toString());
values.put("age", Integer.parseInt(mAge.getText().toString()));
cr.insert(Uri.parse(uri), values);
break;
case R.id.button2:
uri = "content://com.nanguabing.contentprovider.myprovider/delete/"
+ mID.getText().toString();
cr.delete(Uri.parse(uri), null, null);
break;
case R.id.button3:
uri = "content://com.nanguabing.contentprovider.myprovider/update/"
+ mID.getText().toString();
values.put("id", Integer.parseInt(mID.getText().toString()));
values.put("name", mName.getText().toString());
values.put("age", Integer.parseInt(mAge.getText().toString()));
cr.update(Uri.parse(uri), values, null, null);
break;
case R.id.button4:
uri = "content://com.nanguabing.contentprovider.myprovider/query/1";
Cursor cur = cr.query(Uri.parse(uri), null, null, null, null);
String txt = "";
while (cur.moveToNext()) {
txt += cur.getInt(cur.getColumnIndex("id"))
+ cur.getString(cur.getColumnIndex("name"))
+ cur.getInt(cur.getColumnIndex("age"))+"\n";
}
mTV.setText(txt);
// 关闭游标
cur.close();
break;
default:
break;
}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}