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老師，我寫的代碼點(diǎn)進(jìn)去第二種啟動(dòng)方式了，并點(diǎn)了第二界面中的按鈕返回了第一界面，可當(dāng)再點(diǎn)第一界面中的按鈕時(shí)還是可以回到第二界面，，，這是不是說第二界面沒被銷毀，，，如果沒被銷毀該怎么做。。？？ 

我的代碼如下：

1.

package com.example.doemintent;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class FActivity extends Activity implements OnClickListener {

private Button btn1, btn2;

private TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tv = (TextView) findViewById(R.id.textView1);

btn1 = (Button) findViewById(R.id.button1_f);

btn2 = (Button) findViewById(R.id.button2_s);

btn1.setOnClickListener(this);

btn2.setOnClickListener(this);

}

@Override

public void onClick(View v) {

Intent intent = new Intent(FActivity.this, SActivity.class);

startActivityForResult(intent, 1);

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

if (requestCode == 1 && resultCode == 2) {

String content = data.getStringExtra("data");

tv.setText(content);

}

}

}

2.

package com.example.doemintent;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class SActivity extends Activity {

private Button bt;

private String content = "你最近還好嗎？";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.sactivity);

bt = (Button) findViewById(R.id.button1);

bt.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Intent data = new Intent();

data.putExtra("data", content);

setResult(2, data);

finish();

}

});

}

}