第九次作业

package com.example.myapplication;

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

class MyHelper extends SQLiteOpenHelper {
    public MyHelper(Context context) {
        super(context, "itcast.db", null, 1);
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE information(_id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR(20),  phone VARCHAR(20))");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub

    }
}

 

package com.example.myapplication;
import android.text.TextUtils;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity ;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    MyHelper myHelper;
    private EditText mEtName;
    private EditText mEtPriter;
    private EditText mEtPhone;
    private TextView mTvShow;
    private Button mBtnAdd;
    private Button mBtnQuery;
    private Button mBtnUpdate;
    private Button mBtnDelete;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myHelper = new MyHelper(this);
        init();
    }
    private void init() {
        mEtName = (EditText) findViewById(R.id.et_name);
        mEtPhone = (EditText) findViewById(R.id.et_phone);
        mEtPriter=(EditText) findViewById(R.id.et_priter);
        mTvShow = (TextView) findViewById(R.id.tv_show);
        mBtnAdd = (Button) findViewById(R.id.btn_add);
        mBtnQuery = (Button) findViewById(R.id.btn_query);
        mBtnUpdate = (Button) findViewById(R.id.btn_update);
        mBtnDelete = (Button) findViewById(R.id.btn_delete);
        mBtnAdd.setOnClickListener(this);
        mBtnQuery.setOnClickListener(this);
        mBtnUpdate.setOnClickListener(this);
        mBtnDelete.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        String name, phone;
        SQLiteDatabase db;
        ContentValues values;
        String s1=mEtPriter.getText().toString();
        switch (v.getId()) {
            case R.id.btn_add: //添加数据
                name = mEtName.getText().toString();
                phone = mEtPhone.getText().toString();
                db = myHelper.getWritableDatabase();//获取可读写SQLiteDatabse对象
                if (TextUtils.isEmpty(name)) {
                    Toast.makeText(this, "点击错误", Toast.LENGTH_SHORT).show();
                }else {
                    values = new ContentValues();        //创建ContentValues对象
                    values.put("name", name);             //将数据添加到ContentValues对象
                    values.put("phone", phone);
                    db.insert("information", null, values);
                    Toast.makeText(this, "信息已添加", Toast.LENGTH_SHORT).show();
                }

                db.close();
                break;
            case R.id.btn_query: //查询数据
                db = myHelper.getReadableDatabase();
                Cursor cursor = db.query("information", null, "name=?", new String[] {s1}, null,
                        null, null);
                if (cursor.getCount() == 0) {
                    mTvShow.setText("");
                    Toast.makeText(this, "请在框内输入姓名", Toast.LENGTH_SHORT).show();
                } else {
                    cursor.moveToFirst();
                    mTvShow.setText("Name :  " + cursor.getString(1) +
                            "  ；Tel :  " + cursor.getString(2));
                }
                while (cursor.moveToNext()) {
                    mTvShow.append("\n" + "Name :  " + cursor.getString(1) +
                            "  ；Tel :  " + cursor.getString(2));
                }
                cursor.close();
                db.close();
                break;
            case R.id.btn_update: //修改数据
                db = myHelper.getWritableDatabase();
                values = new ContentValues();       // 要修改的数据
                values.put("phone", phone = mEtPhone.getText().toString());
                db.update("information", values, "name=?",
                        new String[]{mEtName.getText().toString()}); // 更新并得到行数
                Toast.makeText(this, "信息已修改", Toast.LENGTH_SHORT).show();
                db.close();
                break;
            case R.id.btn_delete: //删除数据
                db = myHelper.getWritableDatabase();
                db.delete("information", "name=?", new String[] {s1});
                Toast.makeText(this, "信息已删除", Toast.LENGTH_SHORT).show();
                mTvShow.setText("");
                db.close();
                break;
        }
    }
}

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:padding="16dp"
              android:orientation="vertical">
    <LinearLayout
            android:layout_marginTop="130dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="姓  名 ："
                android:textSize="18sp" />
        <EditText
                android:id="@+id/et_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="请输入姓名"
                android:textSize="16sp" />
    </LinearLayout>
    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp">
        <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="电  话 ："
                android:textSize="18sp" />
        <EditText
                android:id="@+id/et_phone"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="请输入手机号码"
                android:textSize="16sp" />
    </LinearLayout>
    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        <Button
                android:id="@+id/btn_add"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginRight="2dp"
                android:layout_weight="1"
                android:background="#B9B9FF"
                android:text="添加"
                android:textSize="18sp" />
        <Button
                android:id="@+id/btn_query"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginRight="2dp"
                android:layout_weight="1"
                android:background="#DCB5FF"
                android:text="查询"
                android:textSize="18sp" />
        <Button
                android:id="@+id/btn_update"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginRight="2dp"
                android:layout_weight="1"
                android:background="#E6CAFF"
                android:text="修改"
                android:textSize="18sp" />
        <Button
                android:id="@+id/btn_delete"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="#ACD6FF"
                android:text="删除"
                android:textSize="18sp" />
    </LinearLayout>
    <TextView
            android:id="@+id/tv_show"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="25dp"
            android:textSize="20sp" />
    <EditText
            android:id="@+id/et_priter"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入需操作的姓名"
            android:textSize="16sp" />


</LinearLayout>