android活动的跳转到另一个活动

第一个活动类

package com.example.myproject2;

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

public class MainActivity extends Activity {

 
 public final  static String Extra_Message="appName";
 private Button btn;
 private EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText=(EditText)findViewById(R.id.entry);
        btn=(Button)findViewById(R.id.ok);
        btn.setOnClickListener(new SendMessage());
       
    }

   
    private final class SendMessage implements View.OnClickListener
    {

  @Override
  public void onClick(View arg0) {
   String message=editText.getText().toString();
   Intent intent=new Intent();
   intent.putExtra(Extra_Message,message);
   intent.setClass(MainActivity.this, DisplayActivy.class);
   startActivity(intent);
   MainActivity.this.finish();表示当前活动结束
   
  }
     
    }
   
    @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;
    }
   
}
---第二个活动类

package com.example.myproject2;

import java.util.RandomAccess;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class DisplayActivy extends Activity {

 
 private RadioGroup radiogroup;
 private RadioButton rbtn1;
 private RadioButton rbtn2;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  
 
  
  super.onCreate(savedInstanceState);
  setContentView(R.layout.display_main);
  
  radiogroup=(RadioGroup)findViewById(R.id.radiogroup);
  rbtn1=(RadioButton)findViewById(R.id.radio1);
  rbtn2=(RadioButton)findViewById(R.id.radio2);
  String message=getIntent().getStringExtra(MainActivity.Extra_Message);
  
  TextView textview=new TextView(this);
  textview.setTextSize(25);
  textview.setText(message+"has receive!");
  
  radiogroup.setOnCheckedChangeListener(new InfoCheck());
  
 }

 
 private final class InfoCheck implements RadioGroup.OnCheckedChangeListener
 {

  @Override
  public void onCheckedChanged(RadioGroup group, int checkid) {
   
   if(checkid==rbtn1.getId())
   {
    DispalyTost(rbtn1.getText().toString()+" you choise");
   }
   else
   {
    DispalyTost(rbtn2.getText().toString()+" you choise");
   }
  }

 
   
   
   
   
   
   
  }
 
 
 public void DispalyTost(String str)
 {
  Toast toast=Toast.makeText(this, str, Toast.LENGTH_LONG);
  toast.setGravity(Gravity.TOP, 2, 220);
  toast.show();
  
 }
 
 
}
--对于配置文件，清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myproject2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.myproject2.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       
        <activity android:name="com.example.myproject2.DisplayActivy"></activity>
    </application>

</manifest>
---------------