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First set of demo apps for DevBytes videos

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Change-Id: I4ae984cf776604cede32b98db6b1eb3cb6c59c7e
This commit is contained in:
Chet Haase
2013-01-10 16:19:38 -08:00
parent 7ca2ee364e
commit 74497f3336
168 changed files with 4819 additions and 0 deletions
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39
samples/devbytes/ui/RequestDuringLayout/AndroidManifest.xml Normal file
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<!-- Copyright (C) 2013 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.
-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.requestduringlayout"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="16" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.android.requestduringlayout.RequestDuringLayout"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

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samples/devbytes/ui/RequestDuringLayout/res/layout/activity_request_during_layout.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2013 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.
-->
<view xmlns:android="http://schemas.android.com/apk/res/android"
class="com.android.requestduringlayout.RequestDuringLayout$MyLayout"
android:orientation="vertical"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/addView"
android:id="@+id/addView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/removeView"
android:id="@+id/removeView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/forceLayout"
android:id="@+id/forceLayout" />
</LinearLayout>
</view>

21
samples/devbytes/ui/RequestDuringLayout/res/values-large/dimens.xml Normal file
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<!-- Copyright (C) 2013 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.
-->
<resources>
<dimen name="padding_small">8dp</dimen>
<dimen name="padding_medium">16dp</dimen>
<dimen name="padding_large">16dp</dimen>
</resources>

19
samples/devbytes/ui/RequestDuringLayout/res/values-v11/styles.xml Normal file
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<!-- Copyright (C) 2013 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.
-->
<resources>
<style name="AppTheme" parent="android:Theme.Holo.Light" />
</resources>

19
samples/devbytes/ui/RequestDuringLayout/res/values-v14/styles.xml Normal file
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<!-- Copyright (C) 2013 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.
-->
<resources>
<style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar" />
</resources>

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samples/devbytes/ui/RequestDuringLayout/res/values/dimens.xml Normal file
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<!-- Copyright (C) 2013 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.
-->
<resources>
<dimen name="padding_small">8dp</dimen>
<dimen name="padding_medium">8dp</dimen>
<dimen name="padding_large">16dp</dimen>
</resources>

23
samples/devbytes/ui/RequestDuringLayout/res/values/strings.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2013 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.
-->
<resources>
<string name="app_name">RequestDuringLayout</string>
<string name="button">Button</string>
<string name="menu_settings">Settings</string>
<string name="addView">Add</string>
<string name="removeView">Remove</string>
<string name="forceLayout">Layout</string>
</resources>

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samples/devbytes/ui/RequestDuringLayout/res/values/styles.xml Normal file
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<!-- Copyright (C) 2013 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.
-->
<resources>
<style name="AppTheme" parent="android:Theme.Light" />
</resources>

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samples/devbytes/ui/RequestDuringLayout/src/com/example/android/requestduringlayout/RequestDuringLayout.java Normal file
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/*
* Copyright (C) 2013 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.requestduringlayout;
import com.android.requestduringlayout.R;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
/**
* This example shows what horrible things can result from calling requestLayout() during
* a layout pass. DON'T DO THIS.
*
* Watch the associated video for this demo on the DevBytes channel of developer.android.com
* or on YouTube at https://www.youtube.com/watch?v=HbAeTGoKG6k.
*/
public class RequestDuringLayout extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_request_during_layout);
final MyLayout myLayout = (MyLayout) findViewById(R.id.container);
Button addViewButton = (Button) findViewById(R.id.addView);
Button removeViewButton = (Button) findViewById(R.id.removeView);
Button forceLayoutButton = (Button) findViewById(R.id.forceLayout);
addViewButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
myLayout.mAddRequestPending = true;
myLayout.requestLayout();
}
});
removeViewButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
myLayout.mRemoveRequestPending = true;
myLayout.requestLayout();
}
});
forceLayoutButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
myLayout.requestLayout();
}
});
}
/**
* Custom layout to enable the convoluted way of requesting-during-layout that we're
* trying to show here. Yes, it's a hack. But it's a case that many apps hit (in much more
* complicated and less demoable ways), so it's interesting to at least understand the
* artifacts that come from this sequence of events.
*/
static class MyLayout extends LinearLayout {
int numButtons = 0;
boolean mAddRequestPending = false;
boolean mRemoveRequestPending = false;
public MyLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public MyLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyLayout(Context context) {
super(context);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
// Here is the root of the problem: we are adding/removing views during layout. This
// means that this view and its container will be put into an uncertain state that
// can be difficult to discover and recover from.
// Better approach: just add/remove at a time when layout is not running, certainly not
// in the middle of onLayout(), or other layout-associated logic.
if (mRemoveRequestPending) {
removeButton();
mRemoveRequestPending = false;
}
if (mAddRequestPending) {
addButton();
mAddRequestPending = false;
}
}
private void removeButton() {
if (getChildCount() > 1) {
removeViewAt(1);
}
}
private void addButton() {
Button button = new Button(getContext());
button.setLayoutParams(new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
button.setText("Button " + (numButtons++));
addView(button);
}
}
}