第七次作业

<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="com.example.js.MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/tv1"
        android:layout_alignTop="@+id/tv1"
        android:text="手机号码" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tv1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="65dp"
        android:onClick="click"
        android:text="充值" />

    <EditText
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="180dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView2"
        android:layout_marginTop="35dp"
        android:layout_toRightOf="@+id/textView1"
         />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="180dp"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView3"
        android:layout_below="@+id/button1"
        android:layout_marginTop="28dp"
        />

</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="com.example.js.MainActivity" >

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/textView1"
        android:layout_marginLeft="60dp"
        android:layout_toRightOf="@+id/textView1"
        android:text="充钱" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="160dp"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="23dp"
        android:layout_marginTop="66dp"
       />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="46dp"
        android:text="充值金额" />

        <EditText
            android:id="@+id/tv2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/textView3"
            android:layout_below="@+id/textView3"
            android:ems="10" >

            <requestFocus />
        </EditText>

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/tv2"
            android:layout_below="@+id/tv2"
            android:layout_marginTop="51dp"
            android:text="充值" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/button1"
            android:layout_alignRight="@+id/tv2"
            android:layout_marginRight="22dp"
            android:text="取消充值" />

</RelativeLayout>

　　

package com.example.js;


import com.example.js.MainActivity;
import com.example.js.MainActivity2;
import com.example.js.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;


   
public class MainActivity extends Activity {  
    private TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
       
        Button button1 = (Button) findViewById(R.id.button1);
 setContentView(R.layout.activity_main);
 


    }

    public void click(View view) {
        EditText tv1 = (EditText) findViewById(R.id.tv1);
        String s1 = tv1.getText().toString();
        Intent intent=new Intent();
            intent.setClass(this,MainActivity2.class);
            intent.putExtra("num",tv1.getText().toString());        
            startActivity(intent);
            
            
    }
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        // TODO Auto-generated method stub
        if(requestCode==1){
            switch(resultCode){
            case 2:
                  String textView2 = intent.getStringExtra("tv2");
                Toast.makeText(MainActivity.this,"您充值了"+textView2+"钱", 0).show();
                break;
            case 3:
    
                Toast.makeText(MainActivity.this,"充值失败", 0).show();
                break;            
            }
        }
    }



    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    

}

　　

package com.example.js;

import com.example.js.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity2 extends Activity implements View.OnClickListener {    

    private TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Button button1 = (Button) findViewById(R.id.button1);
        Button button2 = (Button) findViewById(R.id.button2);
        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        
       
        TextView textView1 = (TextView) findViewById(R.id.textView1);
        Intent intent =getIntent();
        String text =intent.getStringExtra("num");
        textView1.setText("您要为"+text+"");
    }
    public void onClick(View v) {
        EditText tv1 = (EditText) findViewById(R.id.tv1);
        switch (v.getId()) {

        case R.id.button1:    
            EditText tv2=(EditText)findViewById(R.id.tv2);
            String tv21=tv2.getText().toString();
            
        Intent intent=new Intent();
        intent.setClass(this,MainActivity.class);
            intent.putExtra("tv2",tv2.getText().toString());        
            setResult(2,intent);
            finish();//关闭当前窗口
            break;
        case R.id.button2:            
            intent=new Intent();
            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;
        }
    }
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

　　

 

来源：https://www.cnblogs.com/zhangmingzhu/p/11800485.html