7次作业

 

 

 

 

package com.example.chuangkou;

import android.os.Bundle;



import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    
    //点按钮开启第二个窗口
    public void click(View v){
        Intent intent=new Intent(this,MainActivity2.class); 
        EditText et2=(EditText)findViewById(R.id.et2);
        String s=et2.getText().toString();
        intent.putExtra("et1",s );
        startActivityForResult(intent, 1);
        
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        TextView tv1=(TextView)findViewById(R.id.tv1);
        String z=intent.getStringExtra("您充值了");
        String s=intent.getStringExtra("充值失败");
        if(requestCode==1){
            switch(resultCode){
            case 2:
                 tv1.setText("您充值了"+z); 
            //Toast.makeText(this,intent.getStringExtra(z), 0).show();
                break;
            case 3:
                tv1.setText("充值失败"); 
                 //Toast.makeText(this,intent.getStringExtra(s), 0).show();
                  //Toast.makeText(this,"充值失败", 0).show();
                break;            
            }
        }
    }

    

}

package com.example.chuangkou;

import android.os.Bundle;


import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity2 extends Activity  {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        TextView tv=(TextView)findViewById(R.id.tv2); 
        Intent intent =getIntent();
        tv.setText(intent.getStringExtra("et1")+"的号码充值");
    }


    public void click(View v) {
         EditText x=(EditText)findViewById(R.id.et1);
         String txt1=x.getText().toString();
        switch (v.getId()) {
        //如果点的按钮是button2
        case R.id.button2:        
            Intent intent=new Intent();
            intent.putExtra("您充值了", txt1);
            setResult(2, intent);//结果码是2,结果码标记一下是按哪个按钮回去的
            finish();//关闭当前窗口
            break;
            
        case R.id.button3:            
            intent=new Intent();
            intent.putExtra("充值失败", 0);
            setResult(3, intent);//结果码为3
            finish();//finish点击后当前窗口立即关闭，回到上个窗口的onActivityResult方法
            break;
            
        }

    }


}

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/et2"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="122dp"
        android:text="充值"
        android:onClick="click" />

    <EditText
        android:id="@+id/et2"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginTop="55dp"
        android:background="#ffffff"
        android:ems="10"
        android:paddingLeft="20dp"
         android:hint="手机号码：" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/tv1"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_alignLeft="@+id/et2"
        android:layout_alignRight="@+id/et2"
        android:layout_below="@+id/button1"
        android:layout_marginLeft="33dp"
        android:layout_marginTop="19dp"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="italic" />

</RelativeLayout>

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".SecondActiviy" >

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="66dp"
        android:layout_toLeftOf="@+id/button3"
        android:onClick="click"
        android:text="充值" />
   

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/button2"
        android:layout_alignBottom="@+id/button2"
        android:layout_alignParentRight="true"
        android:layout_marginRight="92dp"
        android:onClick="click"
        android:text="取消充值" />

      <EditText
          android:id="@+id/et1"
          android:layout_width="match_parent"
          android:layout_height="40dp"
          android:layout_alignParentTop="true"
          android:layout_centerHorizontal="true"
          android:layout_marginTop="110dp"
          android:background="#ffffff"
          android:ems="10"
          android:hint="充值金额："
          android:paddingLeft="20dp" >

          <requestFocus />
      </EditText>

      <TextView
          android:id="@+id/tv1"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_alignBottom="@+id/et1"
          android:layout_alignLeft="@+id/et1"
          android:layout_marginBottom="66dp"
          android:gravity="center"
          android:text="您要为："
          android:textSize="20sp"
          android:textStyle="italic" />

      <TextView
          android:id="@+id/tv2"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_alignBottom="@+id/tv1"
          android:layout_alignRight="@+id/et1"
          android:layout_toRightOf="@+id/button2"
        />

</RelativeLayout>

 

来源：https://www.cnblogs.com/DOCEAN/p/11728212.html