AndroidのActivity之退出返回栈

左边按钮是退出，右边是下一页，后面几张是左边箭头是跳到前一张,以前很纯真的用startAcitivty往前跳，跳到第一页的时候退出，后面的Activity还在。

就算launchermode改成singleTask也还是这样,还是要finish()才可以大道Back的效果。

ActivityB.java

package cn.com.bvin.stack;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;

public class ActivityB extends Activity{

private ViewGroup rootContainer;
private Button btNext,btBack;
private TextView tvBomt,tvTop;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
initViews();
}

public void initViews(){
rootContainer = (ViewGroup)findViewById(R.id.root);
rootContainer.setBackgroundResource(R.drawable.shake_bg3);
btNext = (Button)findViewById(R.id.btNext);
btBack = (Button)findViewById(R.id.btBack);
tvTop = (TextView)findViewById(R.id.tvTop);
tvTop.setTextColor(Color.BLACK);
tvTop.setText("Hello world,"+getClass().getName()+"!");
tvBomt = (TextView)findViewById(R.id.tvBottom);
tvBomt.setText("第三页");
tvBomt.setTextColor(Color.BLACK);
rootContainer.setBackgroundResource(R.drawable.shake_bg3);
btNext.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(ActivityB.this,ActivityC.class));
}
});
btBack.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//startActivity(new Intent(ActivityB.this,AcitivtyA.class));
finish();
}
});
}

}