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Commit f94c9c4

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Nagesh Susarla
committed
Move ConstraintSet example to an activity
1. To make it easier to understand the ConstraintSet and its usage, move it to another activity. 2. Also move the landscape resource to res/xml/layout-land Change-Id: I405f7d2885186b6c249b092b395bbb40cb0ebd5f
1 parent d24c0b6 commit f94c9c4

8 files changed

Lines changed: 164 additions & 113 deletions

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‎app/src/main/AndroidManifest.xml‎

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@@ -1,13 +1,15 @@
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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package="com.example.android.constraintlayoutexamples">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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android:theme="@style/AppTheme"
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tools:ignore="GoogleAppIndexingWarning">
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<activity
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android:name=".MainActivity"
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android:configChanges="orientation|screenSize">
@@ -17,6 +19,7 @@
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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<activity android:name=".ConstraintSetExampleActivity" />
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</application>
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</manifest>

‎app/src/main/java/com/example/android/constraintlayoutexamples/ConstraintSetExampleActivity.java‎

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@@ -0,0 +1,96 @@
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.constraintlayoutexamples;
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import android.os.Bundle;
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import android.support.constraint.ConstraintLayout;
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import android.support.constraint.ConstraintSet;
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import android.support.v7.app.AppCompatActivity;
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import android.transition.TransitionManager;
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import android.view.View;
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/**
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* An example activity that show cases the use of {@link ConstraintSet}.
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* It starts out with a single ConstraintLayout which is then transitioned to
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* a different ConstraintLayout using {@link ConstraintSet#applyTo(ConstraintLayout)}.
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*/
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public class ConstraintSetExampleActivity extends AppCompatActivity {
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private static final String SHOW_BIG_IMAGE = "showBigImage";
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/**
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* Whether to show an enlarged image
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*/
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private boolean mShowBigImage = false;
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/**
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* The ConstraintLayout that any changes are applied to.
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*/
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private ConstraintLayout mRootLayout;
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/**
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* The ConstraintSet to use for the normal initial state
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*/
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private ConstraintSet mConstraintSetNormal = new ConstraintSet();
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/**
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* ConstraintSet to be applied on the normal ConstraintLayout to make the Image bigger.
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*/
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private ConstraintSet mConstraintSetBig = new ConstraintSet();
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.constraintset_example_main);
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mRootLayout = (ConstraintLayout) findViewById(R.id.activity_constraintset_example);
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// Note that this can also be achieved by calling
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// `mConstraintSetNormal.load(this, R.layout.constraintset_example_main);`
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// Since we already have an inflated ConstraintLayout in `mRootLayout`, clone() is
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// faster and considered the best practice.
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mConstraintSetNormal.clone(mRootLayout);
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// Load the constraints from the layout where ImageView is enlarged.
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mConstraintSetBig.load(this, R.layout.constraintset_example_big);
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if (savedInstanceState != null) {
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boolean previous = savedInstanceState.getBoolean(SHOW_BIG_IMAGE);
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if (previous != mShowBigImage) {
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mShowBigImage = previous;
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applyConfig();
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}
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}
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}
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@Override
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public void onSaveInstanceState(Bundle outState) {
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super.onSaveInstanceState(outState);
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outState.putBoolean(SHOW_BIG_IMAGE, mShowBigImage);
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}
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// Method called when the ImageView within R.layout.constraintset_example_main
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// is clicked.
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public void toggleMode(View v) {
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TransitionManager.beginDelayedTransition(mRootLayout);
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mShowBigImage = !mShowBigImage;
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applyConfig();
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}
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private void applyConfig() {
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if (mShowBigImage) {
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mConstraintSetBig.applyTo(mRootLayout);
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} else {
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mConstraintSetNormal.applyTo(mRootLayout);
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}
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}
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}

‎app/src/main/java/com/example/android/constraintlayoutexamples/MainActivity.java‎

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Original file line numberDiff line numberDiff line change
@@ -1,20 +1,28 @@
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.constraintlayoutexamples;
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import android.content.res.Configuration;
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import android.support.constraint.ConstraintLayout;
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import android.support.constraint.ConstraintSet;
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import android.support.v7.app.AppCompatActivity;
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import android.content.Intent;
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import android.os.Bundle;
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import android.transition.TransitionManager;
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import android.support.v7.app.AppCompatActivity;
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import android.view.View;
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public class MainActivity extends AppCompatActivity {
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private boolean mShowingLayout = false;
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ConstraintSet mSetNormal = new ConstraintSet();
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ConstraintSet mSetBig = new ConstraintSet();
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ConstraintSet mSetBigLandscape = new ConstraintSet();
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ConstraintLayout mLayout;
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boolean mBig = false;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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int id = getResources().getIdentifier(tag, "layout", getPackageName());
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setContentView(id);
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mShowingLayout = true;
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if (tag.equals("constraint_example_7")) {
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mLayout = (ConstraintLayout) findViewById(R.id.activity_main);
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mSetNormal.load(this, R.layout.constraint_example_7);
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mSetBig.load(this, R.layout.constraint_example_7a);
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mSetBigLandscape.load(this, R.layout.constraint_example_7b);
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} else {
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mLayout = null;
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}
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}
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@Override
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}
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}
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public void toggleMode(View v) {
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TransitionManager.beginDelayedTransition(mLayout);
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mBig = !mBig;
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int orientation = getResources().getConfiguration().orientation;
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layout7(orientation == Configuration.ORIENTATION_LANDSCAPE);
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}
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private void layout7(boolean landscape) {
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if (mLayout == null) {
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return;
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}
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if (mBig) {
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if (landscape) {
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mSetBigLandscape.applyTo(mLayout);
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} else {
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mSetBig.applyTo(mLayout);
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}
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} else {
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mSetNormal.applyTo(mLayout);
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}
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}
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@Override
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public void onConfigurationChanged(Configuration newConfig) {
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super.onConfigurationChanged(newConfig);
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layout7(getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE);
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public void showConstraintSetExample(View view) {
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startActivity(new Intent(this, ConstraintSetExampleActivity.class));
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}
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}

app/src/main/res/layout/constraint_example_7b.xml renamed to app/src/main/res/layout-land/constraintset_example_big.xml

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<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:id="@+id/activity_main"
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android:id="@+id/activity_constraintset_example"
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android:layout_width="match_parent"
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android:layout_height="match_parent" >
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