第七次作业

所需截图：

所需代码：

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

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

public class MainActivity extends AppCompatActivity {
    private EditText et_number;
    private TextView tv_show;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_number = findViewById(R.id.et_number);
        tv_show = findViewById(R.id.tv_show);

    }

    public void one(View view) {
        Intent intent = new Intent();
        intent.setClass(this, Main2Activity.class);
        intent.putExtra("number", et_number.getText().toString().trim());
        startActivityForResult(intent, 1);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 1 && resultCode == 2) {
            String show = data.getStringExtra("data");
            tv_show.setTextColor(Color.RED);
            tv_show.setText("充值成功充值了"+show+"元");
        }
        if (requestCode == 1 && resultCode == 3) {
            tv_show.setTextColor(Color.RED);
            tv_show.setText("充值失败");

        }
    }
}

package com.example.myapplication;

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

import androidx.appcompat.app.AppCompatActivity;

public class Main2Activity extends AppCompatActivity {
    private TextView tv_number;
    private EditText et_money;

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

    public void two1(View view) {
        Intent intent = new Intent();
        intent.putExtra("data", et_money.getText().toString().trim());
        setResult(2, intent);
        finish();
    }

    public void two2(View view) {
        Intent intent = new Intent();
        setResult(3, intent);
        finish();
    }
}

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="60dp"
        android:layout_marginRight="20dp"
        android:gravity="center">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="手机号码："
            android:textColor="@android:color/black"
            android:textSize="30sp" />

        <EditText
            android:id="@+id/et_number"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_gravity="center" />
    </LinearLayout>

    <Button
        android:layout_width="150dp"
        android:layout_height="60dp"
        android:layout_centerInParent="true"
        android:onClick="one"
        android:text="充值"
        android:textSize="35sp" />

    <TextView
        android:id="@+id/tv_show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="15dp"
        android:layout_marginBottom="200dp"
        android:textColor="@android:color/black"
        android:textSize="28dp" />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
tools:context=".Main2Activity">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="30dp"
    android:layout_marginTop="50dp"
    android:layout_marginRight="30dp"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="您的号码是:"
        android:textSize="35sp" />

    <TextView
        android:id="@+id/tv_number"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="100dp"
        android:textSize="35sp" />
</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="40dp"
    android:layout_marginTop="50dp"
    android:layout_marginRight="40dp"
    android:orientation="horizontal">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="充值金额:"
        android:textSize="35sp" />

    <EditText
        android:id="@+id/et_money"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        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="two1"
        android:text="充值"
        android:textSize="32sp" />

    <Button
        android:layout_width="180dp"
        android:layout_height="60dp"
        android:layout_marginLeft="35dp"
        android:onClick="two2"
        android:text="取消充值"
        android:textSize="32sp" />
</LinearLayout>


</LinearLayout>