/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.android.apis.app; // Need the following import to get access to the app resources, since this // class is in a sub-package. import com.example.android.apis.R; 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; /** *

Example of removing yourself from the history stack after forwarding to * another activity. This can be useful, for example, to implement a confirmation dialog before the user goes on to another activity -- once the user has confirmed this operation, they should not see the dialog again if they go back from it.

Note that another way to implement a confirmation dialog would be as an activity that returns a result to its caller. Either approach can be useful depending on how it makes sense to structure the application.

Demo

App/Activity/Receive Result

Source files

src/com.example.android.apis/app/Forwarding.java Forwards the user to another activity when its button is pressed
/res/any/layout/forwarding.xml Defines contents of the Forwarding screen
*/ public class Forwarding extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.forwarding); // Watch for button clicks. Button goButton = (Button)findViewById(R.id.go); goButton.setOnClickListener(mGoListener); } private OnClickListener mGoListener = new OnClickListener() { public void onClick(View v) { // Here we start the next activity, and then call finish() // so that our own will stop running and be removed from the // history stack. Intent intent = new Intent(); intent.setClass(Forwarding.this, ForwardTarget.class); startActivity(intent); finish(); } }; }