/*
* 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 app.test;
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 Test extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 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(Test.this, ForwardTarget.class);
startActivity(intent);
finish();
}
};
}
/**
* Example of removing yourself from the history stack after forwarding to
* another activity.
*/
class ForwardTarget extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.row);
}
}
//main.xml
android:gravity="center_horizontal"
android:layout_width="match_parent" android:layout_height="match_parent">
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_weight="0"
android:paddingBottom="4dip"
android:text="forwarding"/>
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="go">
//row.xml
android:gravity="center_horizontal"
android:layout_width="match_parent" android:layout_height="match_parent">
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_weight="0"
android:text="forward_target"/>