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" />

</manifest>
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