Android:ContentProvider的基本方法以及ContentResolver的对Provider的简单增删改查

ContentProvider使我们Android四大组件之一，ContentProvider可以实现在应用程序之间共享数据.

下面是本人自己写的一个简单dome
当然也可以参考详细的博客，点击这里

目录

代码块

首先是ContentProvider的代码：

public class MyPersonProvider   extends ContentProvider {    private SQLiteDatabase database;    @Override    public boolean onCreate() {        database = new DbWrite().openDatabase(getContext());        return false;    }    @Nullable    @Override    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {        return  database.query(false,"myblacklist",new String[]{" bid as _id","bname","bnumber"},selection,selectionArgs,null,null,sortOrder,null);    }    @Nullable    @Override    public String getType(Uri uri) {        return null;    }    @Nullable    @Override    public Uri insert(Uri uri, ContentValues values) {        long id=  database.insert("myblacklist","bname",values);        //通知所有监听这个数据库的观察者，数据发生改变。        getContext().getContentResolver().notifyChange(uri,null);        return ContentUris.withAppendedId(uri,id);    }    @Override    public int delete(Uri uri, String selection, String[] selectionArgs)    {        return database.delete("myblacklist",selection,selectionArgs);    }    @Override    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {        return  database.update("myblacklist",values,selection,selectionArgs);    }}

Provider清单文件:

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.android_22_servicesblacklist">    <uses-permission android:name="android.permission.WRITE_CONTACTS" />    <uses-permission android:name="android.permission.READ_CONTACTS" />    <uses-permission android:name="android.permission.READ_PHONE_STATE" />    <uses-permission android:name="android.permission.READ_PHONE_STATE" />    <uses-permission android:name="android.permission.CALL_PHONE" />    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <receiver android:name=".receiver.CallInterceptReceivec">            <intent-filter>                <action android:name="android.intent.action.PHONE_STATE" />            </intent-filter>        </receiver>        <activity android:name=".InterceptActivity"></activity>        <provider            android:authorities="com.example.android_22_servicesblacklist.BLACKLIST"            android:exported="true"            android:name=".provider.MyPersonProvider">        </provider>    </application></manifest>

下面是内容访问者的代码：

public class MainActivity extends ListActivity {    private ContentResolver resolver;    private EditText name;    private EditText number;    private ListView listView;    private PopupWindow popupWindow;    private View popupView;    private SimpleCursorAdapter simpleCursorAdapter;    private Cursor cursor;    private Uri uri;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //得到布局文件中的listview        listView = getListView();        //得到访问者        resolver = getContentResolver();        //初始化数据        getData();        //listView的长按监听事件        listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {            @Override            public boolean onItemLongClick(AdapterView<?> parent, final View view, int position, long id) {                //弹出窗口进行修改或者删除的操作                popupWindow.showAtLocation(findViewById(R.id.activity_main), Gravity.CENTER, 0, 0);                TextView textView= (TextView) popupView.findViewById(R.id.tv_font_1);//修改                final TextView bid= (TextView) view.findViewById(R.id.tv_item_list_id);//得到当前选中的id                final TextView name= (TextView) view.findViewById(R.id.tv_item_list_name);//名字                final TextView number= (TextView) view.findViewById(R.id.tv_item_list_number);//号码                //修改数据                textView.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        //调用这个自定义的方法，执行不同操作                        caoData(false,new MyblackList(Integer.parseInt(bid.getText().toString()),name.getText().toString(),number.getText().toString()));                        popupWindow.dismiss();//关闭窗口                    }                });                TextView textView2= (TextView) popupView.findViewById(R.id.tv_font_2);//删除                textView2.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        resolver.delete(uri,"bid=?",new String[]{bid.getText().toString()});                        cursor= resolver.query(uri,null,null,null,null);                        simpleCursorAdapter.changeCursor(cursor);                        popupWindow.dismiss();//关闭窗口                    }                });                return false;            }        });    }    public void getData(){        //解析uri字符串拿到uri        uri = Uri.parse("content://com.example.android_22_servicesblacklist.BLACKLIST");        //通过访问者查询数据返回给cursor        cursor = resolver.query(uri,null,null,null,null);        simpleCursorAdapter = new SimpleCursorAdapter(this, R.layout.item_listview, cursor,new String[]{"_id" ,"bname","bnumber"},new int[]{R.id.tv_item_list_id,R.id.tv_item_list_name,R.id.tv_item_list_number});        listView.setAdapter(simpleCursorAdapter);//设置适配器        //得到窗口的一个布局文件        popupView = getLayoutInflater().inflate(R.layout.layout_popupwindow, null);        popupWindow = new PopupWindow(popupView, LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT,true);        popupWindow.setTouchable(true);        popupWindow.setOutsideTouchable(true);        popupWindow.setBackgroundDrawable(new BitmapDrawable(getResources(),(Bitmap)null));        popupWindow.getContentView().setFocusableInTouchMode(true);        popupWindow.getContentView().setFocusable(true);//        popupWindow.setAnimationStyle(R.style.anim_menu_bottombar);//显示的动画效果        popupWindow.getContentView().setOnKeyListener(new View.OnKeyListener() {            @Override            public boolean onKey(View v, int keyCode, KeyEvent event) {                if (keyCode == KeyEvent.KEYCODE_MENU && event.getRepeatCount() == 0                        && event.getAction() == KeyEvent.ACTION_DOWN) {                    if (popupWindow != null && popupWindow.isShowing()) {                        popupWindow.dismiss();                    }                    return true;                }                return false;            }        });    }    public void addData(View view){        caoData(true,null);    }    /**     *     * @param isAdd 是否为添加，否则为修改     * @param myblackList 待修改的对象     */    public void caoData(final boolean isAdd, final MyblackList myblackList){        //添加或修改的窗口        View view1=  getLayoutInflater().inflate(R.layout.layout_resolver,null);        name = (EditText) view1.findViewById(R.id.et_name);        number = (EditText) view1.findViewById(R.id.et_number);        //判断是不是为空 ，为空就是添加操作        if(myblackList!=null){            name.setText(myblackList.getBname());            number.setText(myblackList.getBnumber());        }        AlertDialog.Builder dialog=new AlertDialog.Builder(this);        final AlertDialog dialog1=dialog.create();        dialog1.setTitle("信息");        dialog1.setView(view1);        //显示窗口        dialog1.show();        //得到保存按钮        Button btn_save= (Button) view1.findViewById(R.id.btn_save);        btn_save.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(TextUtils.isEmpty(number.getText().toString())){                    Toast.makeText(MainActivity.this, "不能为空！", Toast.LENGTH_SHORT).show();                }else{                    ContentValues  values=new ContentValues();                    if(isAdd){//为添加窗口                        values.put("bname", name.getText()+"");                        values.put("bnumber", number.getText()+"");                        resolver.insert(uri,values);                    }else{//为修改窗口                        values.put("bname",name.getText()+"");                        values.put("bnumber",number.getText()+"");                        int result=   resolver.update(uri,values,"bid=?",new String[]{myblackList.getBid()+""});                    }                    cursor= resolver.query(uri,null,null,null,null);                    //通知适配器 cursor发生改变                    simpleCursorAdapter.changeCursor(cursor);                    //关闭窗口                    dialog1.dismiss();                }            }        });        //得到修改按钮        Button btn_no= (Button) view1.findViewById(R.id.btn_no);        btn_no.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                dialog1.dismiss();            }        });    }}

layout_resolver.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:id="@+id/et_name"        android:hint="名字"        />    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:id="@+id/et_number"        android:hint="号码"        />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <Button            android:layout_width="0dp"            android:layout_weight="1"            android:id="@+id/btn_save"            android:layout_height="wrap_content"            android:text="保存"            />        <Button            android:layout_width="0dp"            android:layout_weight="1"            android:id="@+id/btn_no"            android:layout_height="wrap_content"            android:text="取消"            />    </LinearLayout></LinearLayout>

layout_popupwindow.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:background="#55cccccc"    android:layout_height="match_parent">    <TextView    android:layout_width="match_parent"    android:gravity="center"    android:layout_height="wrap_content"    android:layout_gravity="center_horizontal"    android:layout_marginTop="15dp"    android:layout_marginBottom="15dp"    android:text="修改信息"        android:id="@+id/tv_font_1"    android:textSize="14sp"    />    <View        android:layout_marginLeft="8dp"        android:layout_marginRight="8dp"        android:layout_width="match_parent"        android:layout_height="0.5dp"        android:background="#cccccc"        >    </View>    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:layout_gravity="center_horizontal"        android:layout_marginTop="15dp"        android:layout_marginBottom="15dp"        android:text="删除信息"        android:id="@+id/tv_font_2"        android:textSize="16sp"        />    <View        android:layout_marginLeft="8dp"        android:layout_marginRight="8dp"        android:layout_width="match_parent"        android:layout_height="0.5dp"        android:background="#cccccc"        >    </View></LinearLayout>

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ContentResolver的界面，增加， listview展示，及popupwindow修改或删除

效果图如下：

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源码下载地址：http://download.csdn.net/detail/james_lang/9748487