contentprovider_provider与contentprovider_resolver连接

contentprovider_provider的MainActivity什么也不写

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

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MyContentProvider

import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.support.annotation.Nullable;

/**
 * @author alice
 * @version 1.0
 * @Date 2017/10/18 11:19
 */
public class MyContentProvider extends ContentProvider {
    String path = "content://alice.bw.com.contentprovider_provider/student";
    SQLiteDatabase db;
    @Override
    public boolean onCreate() {
        MySQliteopenHelper openher = new MySQliteopenHelper(getContext());
         db = openher.getReadableDatabase();
        return false;
    }

    @Nullable
    @Override
    public Cursor query(Uri uri, String[] strings, String s, String[] strings1, String s1) {
        Cursor c = db.query("student",strings,s,strings1,null,null,s1);
        return c;
    }

    @Nullable
    @Override
    public String getType(Uri uri) {
        return null;
    }

    @Nullable
    @Override
    public Uri insert(Uri uri, ContentValues contentValues) {
        long insert = db.insert("student", null, contentValues);
        Uri u = ContentUris.withAppendedId(Uri.parse(path),insert);
        return u;
    }

    @Override
    public int delete(Uri uri, String s, String[] strings) {
        return 0;
    }

    @Override
    public int update(Uri uri, ContentValues contentValues, String s, String[] strings) {
        return 0;
    }
}

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MySQliteopenHelper

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/**
 * @author alice
 * @version 1.0
 * @Date 2017/10/18 11:12
 */
public class MySQliteopenHelper extends SQLiteOpenHelper {

    public MySQliteopenHelper(Context context) {
        super(context, "student", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) {
        sqLiteDatabase.execSQL("create  table  student(_id integer primary key autoincrement,name text,age text)");
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

    }
}

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activity_main的布局

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="alice.bw.com.contentprovider_provider.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"/>
</RelativeLayout>

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contentprovider_resolver的MainActivity

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private String path = "content://alice.bw.com.day16customcontentprovider/student";
    private Button query_bt;
    private Button insert_bt;
    private Button delete_bt;
    private ListView listView;
    private ContentResolver mResolver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mResolver = getContentResolver();
        initView();
    }

    private void initView() {
        query_bt = (Button) findViewById(R.id.query_bt);
        insert_bt = (Button) findViewById(R.id.insert_bt);
        delete_bt = (Button) findViewById(R.id.delete_bt);
        listView = (ListView) findViewById(R.id.listView);

        query_bt.setOnClickListener(this);
        insert_bt.setOnClickListener(this);
        delete_bt.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.query_bt:
                queryStudent();
                break;
            case R.id.insert_bt:
                insertStudent();
                break;
            case R.id.delete_bt:

                break;
        }
    }


    private void insertStudent() {
        View dialogView = View.inflate(this, R.layout.dialog_layout, null);
        final EditText name_et = (EditText) dialogView.findViewById(R.id.name_et);
        final EditText age_et = (EditText) dialogView.findViewById(R.id.age_et);

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setIcon(R.mipmap.ic_launcher).setTitle("警告").setMessage("插入一个学生").setView(dialogView)
                .setPositiveButton("确认", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String name = name_et.getText().toString();
                        String age = age_et.getText().toString();

                        ContentValues values = new ContentValues();
                        values.put("name", name);
                        values.put("age", age);
                        mResolver.insert(Uri.parse(path), values);

                    }
                });
        builder.show();

    }



    // 查询
    private void queryStudent() {
        Cursor c = mResolver.query(Uri.parse(path), null, null, null, null);
        ArrayList<Student> list = new ArrayList<Student>();
        if (c != null) {
            while (c.moveToNext()) {
                String name = c.getString(c.getColumnIndex("name"));
                String age = c.getString(c.getColumnIndex("age"));
                Student stu = new Student(name,age);
                list.add(stu);
            }
        }

        listView.setAdapter(new StudentAdapter(this, list));
    }



}

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Student

public class Student {


    private String name;
    private String age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public Student() {
    }

    public Student(String name, String age) {
        this.name = name;
        this.age = age;
    }
}

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StudentAdapter

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * @author alice
 * @version 1.0
 * @Date 2017/10/18 11:50
 */
public class StudentAdapter extends BaseAdapter {
    private Context mContext;
    private ArrayList<Student> mList;
    private LayoutInflater mInflater;

    public StudentAdapter(Context context, ArrayList<Student> list) {
        mContext = context;
        mList = list;
        mInflater = LayoutInflater.from(mContext);

    }

    @Override
    public int getCount() {
        if(mList!=null){
            return mList.size();
        }
        return 0;
    }

    @Override
    public Student getItem(int i) {
        if(mList!=null){
           return mList.get(i);
        }
        return null;
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder vh = null;
        if(view == null){
            vh = new ViewHolder();
            view = mInflater.inflate(R.layout.item_layout,null);
            vh.name_tv = (TextView) view.findViewById(R.id.name_tv);
            vh.age_tv = (TextView) view.findViewById(R.id.age_tv);
            view.setTag(vh);
        }else {
            vh = (ViewHolder) view.getTag();
        }

        Student student = getItem(i);
        vh.name_tv.setText(student.getName());
        vh.age_tv.setText(student.getAge());

        return view;
    }

    class ViewHolder{
        TextView name_tv,age_tv;
    }
}

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StudentAdapter

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * @author alice
 * @version 1.0
 * @Date 2017/10/18 11:50
 */
public class StudentAdapter extends BaseAdapter {
    private Context mContext;
    private ArrayList<Student> mList;
    private LayoutInflater mInflater;

    public StudentAdapter(Context context, ArrayList<Student> list) {
        mContext = context;
        mList = list;
        mInflater = LayoutInflater.from(mContext);

    }

    @Override
    public int getCount() {
        if(mList!=null){
            return mList.size();
        }
        return 0;
    }

    @Override
    public Student getItem(int i) {
        if(mList!=null){
           return mList.get(i);
        }
        return null;
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder vh = null;
        if(view == null){
            vh = new ViewHolder();
            view = mInflater.inflate(R.layout.item_layout,null);
            vh.name_tv = (TextView) view.findViewById(R.id.name_tv);
            vh.age_tv = (TextView) view.findViewById(R.id.age_tv);
            view.setTag(vh);
        }else {
            vh = (ViewHolder) view.getTag();
        }

        Student student = getItem(i);
        vh.name_tv.setText(student.getName());
        vh.age_tv.setText(student.getAge());

        return view;
    }

    class ViewHolder{
        TextView name_tv,age_tv;
    }
}

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activity_main布局

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="alice.bw.com.contentprovider_resolver.MainActivity">

    <Button
        android:id="@+id/query_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="查询" >
    </Button>

    <Button
        android:id="@+id/insert_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/query_bt"
        android:onClick="onClick"
        android:text="插入" >
    </Button>

    <Button
        android:id="@+id/delete_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/insert_bt"
        android:onClick="onClick"
        android:text="删除" >
    </Button>

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/insert_bt" >
    </ListView>
</RelativeLayout>

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dialog_layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/name_et"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入名字" >
    </EditText>

    <EditText
        android:id="@+id/age_et"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入年龄" />

</LinearLayout>

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item_layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/name_tv"
        android:layout_width="wrap_content"
        android:textSize="18sp"
        android:layout_margin="5dp"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <TextView
        android:id="@+id/age_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:text="TextView"
        android:textSize="18sp" />

</LinearLayout>