作业八

package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt = (Button) findViewById(R.id.bt1);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                EditText et1 = (EditText) findViewById(R.id.et1);
                String et_1 = et1.getText().toString();
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, Main2Activity.class);
                Bundle bundle = new Bundle();
                bundle.putString("nb", et_1);
                intent.putExtras(bundle);
                startActivityForResult(intent,1);

            }
        });
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        // RESULT_OK，判断另外一个activity已经结束数据输入功能，Standard activity result:
        // operation succeeded. 默认值是-1
        if (resultCode == 2) {
            String je = intent.getStringExtra("money");
            if (je.equals("0")) {
                Toast.makeText(MainActivity.this, "充值失败", Toast.LENGTH_SHORT).show();
            } else {

                Toast.makeText(MainActivity.this, "充值金额" + je, Toast.LENGTH_SHORT).show();
            }
        }
    }
}

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 {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Bundle bundle=getIntent().getExtras();
        String n=bundle.getString("nb");
        TextView tv2=findViewById(R.id.t2);
        tv2.setText(n);

    }

    public void qd(View view) {
        EditText et2=findViewById(R.id.et2);
        String et_2= et2.getText().toString();
        Intent intent=new Intent(Main2Activity.this,MainActivity.class);
        intent.putExtra("money",et_2);
        setResult(2,intent);
        finish();
    }

    public void qx(View view) {
        EditText et2=findViewById(R.id.et2);
        String et_2= et2.getText().toString();
        Intent intent=new Intent(Main2Activity.this,MainActivity.class);
        intent.putExtra("money",et_2);
        setResult(2,intent);
        finish();
    }
}

<?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:id="@+id/line1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true">
        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="请输入手机号码：" />

        <EditText
            android:id="@+id/et1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPersonName"
            android:text="" />
    </LinearLayout>

    <Button
        android:id="@+id/bt1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/line1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="44dp"
        android:text="充值"
        />

</RelativeLayout>

<?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=".czActivity">
    <LinearLayout
        android:id="@+id/l2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="200dp">
        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="你即将为："
            />
        <TextView
            android:id="@+id/t2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0"

            />
        <TextView
            android:id="@+id/t3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="充值">

        </TextView>
    </LinearLayout>
    <LinearLayout
        android:id="@+id/lin3"
        android:layout_below="@+id/l2"
        android:layout_marginTop="30sp"
        android:layout_centerHorizontal="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="充值金额：">

        </TextView>
        <EditText
            android:id="@+id/et2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="0"
            android:hint="请输入充值金额">

        </EditText>
    </LinearLayout>

    <LinearLayout
        android:layout_below="@+id/lin3"
        android:layout_marginTop="40sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_centerHorizontal="true">
        <Button
            android:layout_width="wrap_content"
            android:id="@+id/bt2"
            android:text="确定充值"
            android:layout_height="wrap_content"
            android:onClick="qd">

        </Button>
        <Button
            android:layout_width="wrap_content"
            android:layout_marginLeft="80sp"
            android:id="@+id/bt3"
            android:text="取消充值"
            android:layout_height="wrap_content"
            android:onClick="qx">

        </Button>
    </LinearLayout>

</RelativeLayout>