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();
            }
        });
    }

}