第七次作业

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_marginRight="20dp"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="60dp"
        android:gravity="center">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="手机号码"
            android:textColor="#000000"
            android:textSize="20sp"/>
        <EditText
            android:id="@+id/nb"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_gravity="center"
            android:background="#ffffff"/>
    </LinearLayout>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:background="#E9D2D2"
        android:onClick="money"
        android:text="充值"
        android:textSize="30sp" />
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="200dp"
        android:layout_marginLeft="15dp"
        android:textColor="#000000"
        android:textSize="25dp"/>


</RelativeLayout>

package com.example.myapplication;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.SpannedString;
import android.text.style.ForegroundColorSpan;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    EditText numb;
    TextView tv1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        numb = findViewById(R.id.nb);
        tv1 = findViewById(R.id.tv);
    }
    public void money(View view){
        Intent intent=new Intent();
        intent.setClass(this,Main2Activity.class);
        intent.putExtra("number",numb.getText().toString().trim());
        startActivityForResult(intent,1);
    }
    protected void onActivityResult(int requestCode,int resultCode,@Nullable Intent data){
        super.onActivityResult(requestCode,resultCode,data);
        if(requestCode==1&&resultCode==2){
            String t=data.getStringExtra("data");
            String num=numb.getText().toString().trim();
            SpannableStringBuilder builder=new SpannableStringBuilder("您为号码"+num+"充值了"+t+"元");
            tv1.setText(builder);
        }
        if(requestCode==1&&resultCode==3){
            tv1.setTextColor(Color.RED);
            tv1.setText("充值失败");
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Main2Activity">

    <LinearLayout
        android:id="@+id/ll"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="您的号码是："
            android:textSize="30sp" />

        <TextView
            android:id="@+id/NUM"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="100dp"
            android:textSize="30sp"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="30dp"
        android:layout_marginTop="100dp"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="40sp"
            android:text="充值金额:"
            android:textSize="30sp" />

        <EditText
            android:id="@+id/MONEY"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginRight="80dp"

            android:textSize="30sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="200dp"
        android:orientation="horizontal">
        <Button
            android:layout_width="120dp"
            android:layout_height="60dp"
            android:layout_marginLeft="35dp"
            android:onClick="cc"
            android:text="充值"
            android:textSize="32sp" />

        <Button
            android:layout_width="180dp"
            android:layout_height="60dp"
            android:layout_marginLeft="35dp"
            android:onClick="qc"
            android:text="取消充值"
            android:textSize="32sp" />

    </LinearLayout>

</RelativeLayout>

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class Main2Activity extends AppCompatActivity {
    TextView num;
    EditText money;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        num = findViewById(R.id.NUM);
        money = findViewById(R.id.MONEY);
        Intent intent = getIntent();
        num.setText(intent.getStringExtra("number"));
    }

    public void cc(View view) {
        Intent intent = new Intent();
        intent.putExtra("data", money.getText().toString().trim());
        setResult(2,intent);
        finish();
    }
    public void qc(View view){
        Intent intent=new Intent();
        setResult(3,intent);
        finish();
    }
}