1.Server服务编写
UserInfoProvider.java
package com.tiger.chapter07_server.provider;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.util.Log;
import com.tiger.chapter07_server.database.UserDBHelper;
public class UserInfoProvider extends ContentProvider {
private UserDBHelper dbHelper;
private static final UriMatcher URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
private static final int USERS = 1;//多行
private static final int USER = 2;//一条
static {
//往Uri 匹配器中添加指定的数据路径
URI_MATCHER.addURI(UserInfoContent.AUTHORITIES, "/user", USERS);
URI_MATCHER.addURI(UserInfoContent.AUTHORITIES, "/user/#", USER);
}
//content://com.tiger.chapter07_server.provider.UserInfoProvider/user
@Override
public Uri insert(Uri uri, ContentValues values) {
Log.d("ning", "UserInfoProvider insert");
if (URI_MATCHER.match(uri)==USERS){
SQLiteDatabase db = dbHelper.getWritableDatabase();
db.insert(UserDBHelper.TABLE_NAME, null, values);
db.close();
}
return uri;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
switch (URI_MATCHER.match(uri)) {
case USERS:
SQLiteDatabase db1 = dbHelper.getWritableDatabase();
count = db1.delete(UserDBHelper.TABLE_NAME, selection, selectionArgs);
db1.close();
break;
case USER:
//删除单行
String id = uri.getLastPathSegment();
SQLiteDatabase db2 = dbHelper.getWritableDatabase();
count = db2.delete(UserDBHelper.TABLE_NAME, "_id=?", new String[]{id});
db2.close();
break;
}
return count;
}
@Override
public String getType(Uri uri) {
// TODO: Implement this to handle requests for the MIME type of the data
// at the given URI.
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public boolean onCreate() {
Log.d("ning", "UserInfoProvider onCreate");
dbHelper = UserDBHelper.getInstance(getContext());
//true代表成功 ，false 代表失败
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
Log.d("ning", "UserInfoProvider insert");
SQLiteDatabase db = dbHelper.getReadableDatabase();
return db.query(UserDBHelper.TABLE_NAME, projection, selection, selectionArgs, null, null, null, null);
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
// TODO: Implement this to handle requests to update one or more rows.
throw new UnsupportedOperationException("Not yet implemented");
}
}UserInfoContent
package com.tiger.chapter07_server.provider;
import android.net.Uri;
public class UserInfoContent {
public static final String AUTHORITIES = "com.tiger.chapter07_server.provider.UserInfoProvider";
//访问内容提供其的URI
public static final Uri CONTENT_URI = Uri.parse("content://"+AUTHORITIES+"/user");
// 下面是该表的各个字段名称
public static final String _ID = "_id";
public static final String USER_NAME = "name";
public static final String USER_AGE = "age";
public static final String USER_HEIGHT = "height";
public static final String USER_WEIGHT = "weight";
public static final String USER_MARRIED = "married";
}
DbHelpler
package com.tiger.chapter07_server.database;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import androidx.annotation.Nullable;
import com.tiger.chapter07_server.entity.User;
import java.util.ArrayList;
import java.util.List;
public class UserDBHelper extends SQLiteOpenHelper {
private static final String DB_NAME = "user.db";
private static final int DB_VERSION = 1;
public static final String TABLE_NAME = "user_info";
private static UserDBHelper mHelper = null;
private UserDBHelper(@Nullable Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
//利用单例模式获取数据库帮助其的唯一实例 没有那么大的并发量 所以不用加锁
public static UserDBHelper getInstance(Context context) {
if (mHelper == null) {
mHelper = new UserDBHelper(context);
}
return mHelper;
}
//创建数据库,执行建表语句
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + " (" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," +
" name VARCHAR NOT NULL," +
" age INTEGER NOT NULL," +
" height LONG NOT NULL," +
" weight FLOAT NOT NULL," +
" married INTEGER NOT NULL);";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
2.Client编写
ContentWriteActivity.java
package com.tiger.chapter07_client;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import com.tiger.chapter07_client.entity.User;
import com.tiger.chapter07_client.utils.ToastUtlis;
public class ContentWriteActivity extends AppCompatActivity implements View.OnClickListener {
private EditText et_name;
private EditText et_age;
private EditText et_height;
private EditText et_weight;
private CheckBox ck_married;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_content_write);
et_name = findViewById(R.id.et_name);
et_age = findViewById(R.id.et_age);
et_height = findViewById(R.id.et_height);
et_weight = findViewById(R.id.et_weight);
ck_married = findViewById(R.id.ck_married);
findViewById(R.id.btn_save).setOnClickListener(this);
findViewById(R.id.btn_delete).setOnClickListener(this);
findViewById(R.id.btn_read).setOnClickListener(this);
}
@SuppressLint("Range")
@Override
public void onClick(View v) {
if (v.getId() == R.id.btn_save) {
//调用getContentResolver 方法获取
ContentValues values = new ContentValues();
values.put(UserInfoContent.USER_NAME, et_name.getText().toString());
values.put(UserInfoContent.USER_AGE, Integer.parseInt(et_age.getText().toString()));
values.put(UserInfoContent.USER_HEIGHT, Integer.parseInt(et_height.getText().toString()));
values.put(UserInfoContent.USER_WEIGHT, Float.parseFloat(et_weight.getText().toString()));
values.put(UserInfoContent.USER_MARRIED, ck_married.isChecked());
//第一个参数调用Uri 第二个参数 是传入的values值
getContentResolver().insert(UserInfoContent.CONTENT_URI, values);
ToastUtlis.show(this, "保存成功");
} else if (v.getId() == R.id.btn_read) {
Cursor cursor = getContentResolver().query(UserInfoContent.CONTENT_URI, null, null, null, null);
if (cursor != null) {
while (cursor.moveToNext()) {
User info = new User();
info.id = cursor.getInt(cursor.getColumnIndex(UserInfoContent._ID));
info.name = cursor.getString(cursor.getColumnIndex(UserInfoContent.USER_NAME));
info.age = cursor.getInt(cursor.getColumnIndex(UserInfoContent.USER_AGE));
info.height = cursor.getInt(cursor.getColumnIndex(UserInfoContent.USER_HEIGHT));
info.weight = cursor.getFloat(cursor.getColumnIndex(UserInfoContent.USER_WEIGHT));
info.married = cursor.getInt(cursor.getColumnIndex(UserInfoContent.USER_MARRIED)) == 1 ? true : false;
Log.d("ning", info.toString());
}
cursor.close();
}
} else if (v.getId() == R.id.btn_delete) {
Uri uri = ContentUris.withAppendedId(UserInfoContent.CONTENT_URI, 2);
// int delete = getContentResolver().delete(uri, null, null);
int delete = getContentResolver().delete(UserInfoContent.CONTENT_URI, null, null);
if (delete > 0) {
ToastUtlis.show(this, "删除成功");
}
}
}
}xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:text="姓名："
android:textColor="@color/black"
android:textSize="17sp" />
<EditText
android:id="@+id/et_name"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:layout_weight="1"
android:background="@drawable/editext_selector"
android:hint="请输入姓名"
android:inputType="text"
android:maxLength="12"
android:text="Jack"
android:textColor="@color/black"
android:textSize="17sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_age"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:text="年龄："
android:textColor="@color/black"
android:textSize="17sp" />
<EditText
android:id="@+id/et_age"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:layout_weight="1"
android:background="@drawable/editext_selector"
android:hint="请输入年龄"
android:inputType="number"
android:maxLength="2"
android:text="18"
android:textColor="@color/black"
android:textSize="17sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_height"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:text="身高："
android:textColor="@color/black"
android:textSize="17sp" />
<EditText
android:id="@+id/et_height"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:layout_weight="1"
android:background="@drawable/editext_selector"
android:hint="请输入身高"
android:inputType="number"
android:maxLength="3"
android:text="180"
android:textColor="@color/black"
android:textSize="17sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_weight"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:text="体重："
android:textColor="@color/black"
android:textSize="17sp" />
<EditText
android:id="@+id/et_weight"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:layout_weight="1"
android:background="@drawable/editext_selector"
android:hint="请输入体重"
android:inputType="numberDecimal"
android:maxLength="5"
android:text="180"
android:textColor="@color/black"
android:textSize="17sp" />
</LinearLayout>
<CheckBox
android:id="@+id/ck_married"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:gravity="center"
android:text="已婚"
android:textColor="@color/black"
android:textSize="17sp" />
<Button
android:id="@+id/btn_save"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="保存"
android:textColor="@color/black"
android:textSize="17sp" />
<Button
android:id="@+id/btn_read"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="读取"
android:textColor="@color/black"
android:textSize="17sp" />
<Button
android:id="@+id/btn_delete"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="删除"
android:textColor="@color/black"
android:textSize="17sp" />
</LinearLayout>
