android开发第六天ContentProvider数据共享

provider

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;

    }



}

mainfest.xml

<?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>

activity

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;

    }



}

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