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Android_finalwork
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将注册、登录界面完善完全，实现注册、登录、忘记密码、修改密码等功能，包括一些动画的实现美化并将代码进行了一些改进，例如一些回退跳转功能

This commit is contained in:
tanc 2024-05-27 18:22:32 +08:00
parent 0856c27e1d
commit 897a20f524
14 changed files with 249 additions and 215 deletions
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1
build.gradle.kts
View File

@ -50,4 +50,5 @@ dependencies {
implementation ("com.squareup.okhttp3:logging-interceptor:4.9.3")
implementation ("com.squareup.retrofit2:retrofit:2.9.0")
implementation ("com.squareup.retrofit2:converter-gson:2.9.0")
implementation("org.greenrobot:eventbus:3.3.1")
}

14
src/main/AndroidManifest.xml
View File

@ -27,7 +27,19 @@
android:name=".LoginMainActivity"
android:exported="false" />
<activity
android:name=".SpActivity"
android:name=".Serch"
android:exported="false" />
<activity
android:name=".ViewAction"
android:exported="false" />
<activity
android:name=".Study"
android:exported="false" />
<activity
android:name=".Study_pinglunm"
android:exported="false" />
<activity
android:name=".ViewStart"
android:exported="false" />
<activity
android:name=".welcome"

66
src/main/java/com/example/liyueling_final/ChangePasswordActivity.java
View File

@ -2,13 +2,79 @@ package com.example.liyueling_final;
import androidx.appcompat.app.AppCompatActivity;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.ValueAnimator;
import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class ChangePasswordActivity extends AppCompatActivity {
EditText phone;
EditText password;
EditText repassword;
TextView textView;
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_change_password);
textView = findViewById(R.id.textView170);
imageView = findViewById(R.id.imageView141);
phone = findViewById(R.id.phone);
password = findViewById(R.id.password1);
repassword = findViewById(R.id.password2);
textView = findViewById(R.id.textView170);
imageView = findViewById(R.id.imageView141);
PropertyValuesHolder propertyValuesHolder = PropertyValuesHolder.ofFloat("translationY",-100,0);
PropertyValuesHolder propertyValuesHolder3 = PropertyValuesHolder.ofFloat("alpha",0,1);
PropertyValuesHolder propertyValuesHolder4 = PropertyValuesHolder.ofFloat("rotation",-15,0);
ValueAnimator animator = ObjectAnimator.ofPropertyValuesHolder(imageView,propertyValuesHolder,propertyValuesHolder4,propertyValuesHolder3);
ValueAnimator animator2 = ObjectAnimator.ofPropertyValuesHolder(textView,propertyValuesHolder,propertyValuesHolder4,propertyValuesHolder3);
animator.setDuration(1000);
animator.start();
animator2.setDuration(1000);
animator2.start();
findViewById(R.id.enter).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String phoneNumber = phone.getText().toString();
String userPassword = password.getText().toString();
String reuserPassword = repassword.getText().toString();
if (phoneNumber.isEmpty() || userPassword.isEmpty() || reuserPassword.isEmpty()) {
Toast.makeText(ChangePasswordActivity.this, "内容不能为空", Toast.LENGTH_SHORT).show();
return;
}
if (!userPassword.equals(reuserPassword)) {
Toast.makeText(ChangePasswordActivity.this, "两次输入密码不同", Toast.LENGTH_SHORT).show();
return;
}
DBTools dbTools = new DBTools(ChangePasswordActivity.this,"test",null,1);//数据库的名字
SQLiteDatabase sqLiteDatabase = dbTools.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("password",userPassword);
sqLiteDatabase.update("user", contentValues,
"phone=?", new String[]{phoneNumber});
Intent intent = new Intent(ChangePasswordActivity.this, LoginMainActivity.class);
startActivity(intent);
finish();
}
});
}
}

28
src/main/java/com/example/liyueling_final/DBTools.java Normal file
View File

@ -0,0 +1,28 @@
package com.example.liyueling_final;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.annotation.Nullable;
public class DBTools extends SQLiteOpenHelper {
public DBTools(@Nullable Context context, @Nullable String name, @Nullable SQLiteDatabase.CursorFactory factory, int version) {
super(context, name, factory, version);
}
@Override
public void onCreate(SQLiteDatabase db) {
//创建数据库和表
db.execSQL("create table user(id integer primary key autoincrement,phone varchar(20),password varchar(20) )");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
//更新数据库表的信息
}
}

65
src/main/java/com/example/liyueling_final/EnrollActivity.java
View File

@ -2,12 +2,19 @@ package com.example.liyueling_final;
import androidx.appcompat.app.AppCompatActivity;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.ValueAnimator;
import android.content.ContentValues;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import retrofit2.Call;
@ -20,11 +27,31 @@ public class EnrollActivity extends AppCompatActivity {
EditText phone;
EditText password;
EditText repassword;
TextView textView;
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_enroll);
textView = findViewById(R.id.textView170);
imageView = findViewById(R.id.imageView141);
phone = findViewById(R.id.phone);
password = findViewById(R.id.password1);
repassword = findViewById(R.id.password2);
PropertyValuesHolder propertyValuesHolder = PropertyValuesHolder.ofFloat("translationY", -100, 0);
PropertyValuesHolder propertyValuesHolder3 = PropertyValuesHolder.ofFloat("alpha", 0, 1);
PropertyValuesHolder propertyValuesHolder4 = PropertyValuesHolder.ofFloat("rotation", -15, 0);
ValueAnimator animator = ObjectAnimator.ofPropertyValuesHolder(imageView, propertyValuesHolder, propertyValuesHolder4, propertyValuesHolder3);
ValueAnimator animator2 = ObjectAnimator.ofPropertyValuesHolder(textView, propertyValuesHolder, propertyValuesHolder4, propertyValuesHolder3);
animator.setDuration(1000);
animator.start();
animator2.setDuration(1000);
animator2.start();
findViewById(R.id.enter).setOnClickListener(new View.OnClickListener() {
@ -43,40 +70,24 @@ public class EnrollActivity extends AppCompatActivity {
Toast.makeText(EnrollActivity.this, "两次输入密码不同", Toast.LENGTH_SHORT).show();
return;
}
userApi api2 = RetrofitUtils.getRetrofit("https://dev.usemock.com/664ac0559e857b0cdafce629/").create(userApi.class);
try {
Call<User> call = api2.Enroll(phoneNumber,userPassword);
call.enqueue(new Callback<User>() {
@Override
public void onResponse(Call<User> call, Response<User> response) {
User user = response.body();
if (user != null && user.password.equals(userPassword)) {
Intent intent = new Intent(EnrollActivity.this, LoginMainActivity.class);
startActivity(intent);
finish();
} else {
// 注册失败
Toast.makeText(EnrollActivity.this, "注册失败", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onFailure(Call<User> call, Throwable t) {
Toast.makeText(EnrollActivity.this, "Network error", Toast.LENGTH_SHORT).show();
}
});
} catch (Exception e) {
Log.e("YourTag", "Error occurred: " + e.getMessage()); // 打印异常信息
}
DBTools dbTools = new DBTools(EnrollActivity.this,"test",null,1);//数据库的名字
SQLiteDatabase sqLiteDatabase = dbTools.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("phone",phoneNumber);
contentValues.put("password",userPassword);
sqLiteDatabase.insert("user",null,contentValues);
Intent intent = new Intent(EnrollActivity.this, LoginMainActivity.class);
startActivity(intent);
finish();
}
});
findViewById(R.id.textView174).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(EnrollActivity.this,LoginMainActivity.class);
Intent intent = new Intent(EnrollActivity.this, LoginMainActivity.class);
startActivity(intent);
finish();
}

20
src/main/java/com/example/liyueling_final/ForgetPasswordActivity.java
View File

@ -2,21 +2,41 @@ package com.example.liyueling_final;
import androidx.appcompat.app.AppCompatActivity;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.ValueAnimator;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class ForgetPasswordActivity extends AppCompatActivity {
EditText yanzhen;
TextView textView;
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_forget_password);
yanzhen = findViewById(R.id.password1);
textView = findViewById(R.id.textView170);
imageView = findViewById(R.id.imageView141);
PropertyValuesHolder propertyValuesHolder = PropertyValuesHolder.ofFloat("translationY",-100,0);
PropertyValuesHolder propertyValuesHolder3 = PropertyValuesHolder.ofFloat("alpha",0,1);
PropertyValuesHolder propertyValuesHolder4 = PropertyValuesHolder.ofFloat("rotation",-15,0);
ValueAnimator animator = ObjectAnimator.ofPropertyValuesHolder(imageView,propertyValuesHolder,propertyValuesHolder4,propertyValuesHolder3);
ValueAnimator animator2 = ObjectAnimator.ofPropertyValuesHolder(textView,propertyValuesHolder,propertyValuesHolder4,propertyValuesHolder3);
animator.setDuration(1000);
animator.start();
animator2.setDuration(1000);
animator2.start();
findViewById(R.id.fasong).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

73
src/main/java/com/example/liyueling_final/LoginMainActivity.java
View File

@ -1,12 +1,19 @@
package com.example.liyueling_final;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.ValueAnimator;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
@ -24,6 +31,11 @@ public class LoginMainActivity extends AppCompatActivity {
private RadioButton radioButton;
EditText phone;
EditText password;
TextView textView;
ImageView imageView;
boolean flag;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
@ -32,12 +44,30 @@ public class LoginMainActivity extends AppCompatActivity {
phone = findViewById(R.id.phone);
password = findViewById(R.id.password1);
textView = findViewById(R.id.textView170);
imageView = findViewById(R.id.imageView141);
PropertyValuesHolder propertyValuesHolder = PropertyValuesHolder.ofFloat("translationY", -100, 0);
PropertyValuesHolder propertyValuesHolder3 = PropertyValuesHolder.ofFloat("alpha", 0, 1);
PropertyValuesHolder propertyValuesHolder4 = PropertyValuesHolder.ofFloat("rotation", -15, 0);
ValueAnimator animator = ObjectAnimator.ofPropertyValuesHolder(imageView, propertyValuesHolder, propertyValuesHolder4, propertyValuesHolder3);
ValueAnimator animator2 = ObjectAnimator.ofPropertyValuesHolder(textView, propertyValuesHolder, propertyValuesHolder4, propertyValuesHolder3);
animator.setDuration(1000);
animator.start();
animator2.setDuration(1000);
animator2.start();
DBTools dbTools = new DBTools(LoginMainActivity.this, "test", null, 1);//数据库的名字
SQLiteDatabase sqLiteDatabase = dbTools.getWritableDatabase();
findViewById(R.id.enter).setOnClickListener(new View.OnClickListener() {
@SuppressLint("Range")
@Override
public void onClick(View v) {
flag = true;
String phoneNumber = phone.getText().toString();
String userPassword = password.getText().toString();
@ -50,40 +80,29 @@ public class LoginMainActivity extends AppCompatActivity {
Toast.makeText(LoginMainActivity.this, "请同意协议", Toast.LENGTH_SHORT).show();
return;
}
userApi api2 = RetrofitUtils.getRetrofit("https://dev.usemock.com/664ac0559e857b0cdafce629/").create(userApi.class);
try {
Call<User> call = api2.Login(phoneNumber);
call.enqueue(new Callback<User>() {
@Override
public void onResponse(Call<User> call, Response<User> response) {
User user = response.body();
if (user != null && user.password.equals(userPassword)) {
Intent intent = new Intent(LoginMainActivity.this, MainActivity.class);
startActivity(intent);
finish();
} else {
// 登录失败
Toast.makeText(LoginMainActivity.this, "Login failed", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onFailure(Call<User> call, Throwable t) {
Toast.makeText(LoginMainActivity.this, "Network error", Toast.LENGTH_SHORT).show();
}
});
} catch (Exception e) {
Log.e("YourTag", "Error occurred: " + e.getMessage()); // 打印异常信息
Cursor cursor = sqLiteDatabase.query("user", new String[]{"id", "phone", "password"},
"phone=?", new String[]{phoneNumber}, null, null, null);
while (cursor.moveToNext()) {
if (cursor != null && cursor.getString(cursor.getColumnIndex("password")).equals(userPassword)) {
Intent intent = new Intent(LoginMainActivity.this, MainActivity.class);
startActivity(intent);
finish();
flag = false;
}
}
if(flag==true){
Toast.makeText(LoginMainActivity.this, "手机号或密码不正确", Toast.LENGTH_SHORT).show();
}
}
});
findViewById(R.id.textView174).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(LoginMainActivity.this,EnrollActivity.class);
Intent intent = new Intent(LoginMainActivity.this, EnrollActivity.class);
startActivity(intent);
finish();
}
@ -91,7 +110,7 @@ public class LoginMainActivity extends AppCompatActivity {
findViewById(R.id.textView175).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(LoginMainActivity.this,ForgetPasswordActivity.class);
Intent intent = new Intent(LoginMainActivity.this, ForgetPasswordActivity.class);
startActivity(intent);
finish();
}

10
src/main/java/com/example/liyueling_final/Serch.java
View File

@ -1,14 +1,24 @@
package com.example.liyueling_final;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class Serch extends AppCompatActivity {
TextView cancel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_serch);
findViewById(R.id.cancel).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
}

47
src/main/java/com/example/liyueling_final/SpActivity.java
View File

@ -1,47 +0,0 @@
package com.example.liyueling_final;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import androidx.appcompat.app.AppCompatActivity;
public class SpActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sp);
findViewById(R.id.button1).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences("user",MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("name","计科一班");
editor.putBoolean("isLogin",true);
editor.commit();
}
});
findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences("user",MODE_PRIVATE);
String name = sharedPreferences.getString("name","");
boolean isLogin = sharedPreferences.getBoolean("isLogin",false);
Log.i("test",name+isLogin);
}
});
findViewById(R.id.button3).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences("user",MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.commit();
}
});
}
}

45
src/main/java/com/example/liyueling_final/Study_mulu.java
View File

@ -7,53 +7,8 @@ import android.view.ViewGroup;
import androidx.fragment.app.Fragment;
/**
* A simple {@link Fragment} subclass.
* Use the {@link Study_mulu#newInstance} factory method to
* create an instance of this fragment.
*/
public class Study_mulu extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public Study_mulu() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment Study_mulu.
*/
// TODO: Rename and change types and number of parameters
public static Study_mulu newInstance(String param1, String param2) {
Study_mulu fragment = new Study_mulu();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {

45
src/main/java/com/example/liyueling_final/welcome.java
View File

@ -1,5 +1,8 @@
package com.example.liyueling_final;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.ValueAnimator;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
@ -14,11 +17,10 @@ import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class welcome extends AppCompatActivity {
private TranslateAnimation ra;
private TranslateAnimation rb;
TextView textView;
ImageView imageView;
ImageView imageView2;
ImageView imageView3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
@ -26,27 +28,32 @@ public class welcome extends AppCompatActivity {
textView = findViewById(R.id.textView169);
imageView = findViewById(R.id.imageView);
rb = new TranslateAnimation(Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0,
Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0.5f);
imageView2 = findViewById(R.id.enter);
imageView3 = findViewById(R.id.imageView143);
PropertyValuesHolder propertyValuesHolder = PropertyValuesHolder.ofFloat("translationY",-100,0);
PropertyValuesHolder propertyValuesHolder3 = PropertyValuesHolder.ofFloat("alpha",0,1);
PropertyValuesHolder propertyValuesHolder4 = PropertyValuesHolder.ofFloat("rotation",-15,0);
ValueAnimator animator = ObjectAnimator.ofPropertyValuesHolder(imageView,propertyValuesHolder,propertyValuesHolder4,propertyValuesHolder3);
ValueAnimator animator2 = ObjectAnimator.ofPropertyValuesHolder(textView,propertyValuesHolder,propertyValuesHolder4,propertyValuesHolder3);
animator.setDuration(1000);
animator.start();
animator2.setDuration(1000);
animator2.start();
ra = new TranslateAnimation(Animation.RELATIVE_TO_SELF,-0.5f,Animation.RELATIVE_TO_SELF,0.5f,
Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0);
ra.setDuration(1000);
ra.setRepeatMode(Animation.REVERSE);
ra.setInterpolator(new AccelerateInterpolator());
ra.setFillAfter(true);
rb.setDuration(1000);
rb.setRepeatMode(Animation.REVERSE);
rb.setInterpolator(new AccelerateInterpolator());
rb.setFillAfter(true);
textView.startAnimation(rb);
imageView.startAnimation(rb);
ObjectAnimator objectAnimator2 = ObjectAnimator.ofFloat(imageView,"translationY",-200,0);
objectAnimator2.setDuration(1000);
objectAnimator2.start();
findViewById(R.id.enter).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
v.startAnimation(ra);
PropertyValuesHolder propertyValuesHolder = PropertyValuesHolder.ofFloat("translationX",-50,50);
PropertyValuesHolder propertyValuesHolder3 = PropertyValuesHolder.ofFloat("alpha",1,0.2f);
ValueAnimator animator = ObjectAnimator.ofPropertyValuesHolder(imageView2,propertyValuesHolder,propertyValuesHolder3);
animator.setDuration(1000);
animator.start();
Intent intent = new Intent(welcome.this, LoginMainActivity.class);
startActivity(intent);

11
src/main/res/layout/activity_enroll.xml
View File

@ -115,17 +115,6 @@
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/password1" />
<RadioButton
android:id="@+id/radioButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:text="登录即同意用户协议"
android:textColor="#515151"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/textView174"
android:layout_width="wrap_content"

2
src/main/res/layout/activity_serch.xml
View File

@ -78,7 +78,7 @@
app:layout_constraintVertical_bias="0.697" />
<TextView
android:id="@+id/textView145"
android:id="@+id/cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="取消"

37
src/main/res/layout/activity_sp.xml
View File

@ -1,37 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SpActivity">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="44dp"
android:text="增加数据"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询数据"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button1" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="删除数据"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button2" />
</androidx.constraintlayout.widget.ConstraintLayout>