Mega Code Archive
Example of removing yourself from the history stack after forwarding to another activity
<![CDATA[
/*
* 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;
/**
* <p>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.</p>
<p>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.</p>
<h4>Demo</h4>
App/Activity/Receive Result
<h4>Source files</h4>
<table class="LinkTable">
<tr>
<td class="LinkColumn">src/com.example.android.apis/app/Forwarding.java</td>
<td class="DescrColumn">Forwards the user to another activity when its button is pressed</td>
</tr>
<tr>
<td class="LinkColumn">/res/any/layout/forwarding.xml</td>
<td class="DescrColumn">Defines contents of the Forwarding screen</td>
</tr>
</table>
*/
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
<?xml version="1.0" encoding="utf-8"?>
<!-- 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.
-->
<!-- Demonstrates receiving activity results.
See corresponding Java code com.android.sdk.app.ReceiveResult.java. -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:padding="4dip"
android:gravity="center_horizontal"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_weight="0"
android:paddingBottom="4dip"
android:text="forwarding"/>
<Button android:id="@+id/go"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="go">
<requestFocus />
</Button>
</LinearLayout>
//row.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- 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.
-->
<!-- Demonstrates receiving activity results.
See corresponding Java code com.android.sdk.app.ReceiveResult.java. -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:padding="4dip"
android:gravity="center_horizontal"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_weight="0"
android:text="forward_target"/>
</LinearLayout>
]]>