I'm a beginner and after searching on the net for a long time I found no satisfactory and permanent solution.
The problem is I can't see my design in Android Studio 3.0.1.
I get a screen like this:
My STYLE.XML code
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
<style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
</resources>
My CONTENT CONTACT.XML code
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="hk.ust.cse.comp107x.chatclient.Contacts"
tools:showIn="@layout/activity_contacts">
<ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/friendListView"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
My XML code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="hk.ust.cse.comp107x.chatclient.ChatClient">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:padding="5pt"
android:id="@+id/linearLayout"
android:background="#ffffff"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_margin="0pt">
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/messageText"
android:layout_gravity="bottom"
android:layout_weight="1"
android:hint="@string/messagehint" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/sendButton"
android:src="@drawable/ic_send_black_36dp"
android:background="@android:drawable/btn_default_small" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_above="@+id/linearLayout"
android:padding="5pt"
android:background="@null">
<android.support.v7.widget.RecyclerView
android:id="@+id/messageList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@null"
android:divider="@null"
android:scrollbars="vertical"
android:stackFromBottom="true"
android:transcriptMode="alwaysScroll" />
</LinearLayout>
</RelativeLayout>
My BUILD.GRADLE code (app)
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "myappID"
minSdkVersion 18
targetSdkVersion 23
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
androidTestCompile 'com.android.support.test:runner:0.4.1'
// Set this dependency to use JUnit 4 rules
androidTestCompile 'com.android.support.test:rules:0.4.1'
// Set this dependency to build and run Espresso tests
androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
// Set this dependency to build and run UI Automator tests
androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.2'
androidTestCompile 'com.android.support:support-annotations:23.4.0'
// Optional -- Hamcrest library
androidTestCompile 'org.hamcrest:hamcrest-library:1.3'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.support:design:23.4.0'
compile 'com.android.support:cardview-v7:23.4.0'
compile 'com.android.support:recyclerview-v7:23.4.0'
}
My activity_contact.xml (maybe this is coordinator layout?)
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="hk.ust.cse.comp107x.chatclient.Contacts">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_contacts" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_input_add" />
</android.support.design.widget.CoordinatorLayout>
I don't think there's a problem with Java code as I took this from a Learning course that I enrolled in Recently.
EDIT: NOW I CAN SEE MY LAYOUT BUT I HAVE A GRADLE PROJECT SYNC FAILED. APPRECIATE ANY HELP
My New Gradle code -
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "hk.ust.cse.comp107x.chatclient"
minSdkVersion 18
targetSdkVersion 23
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
androidTestCompile 'com.android.support.test:runner:0.4.1'
// Set this dependency to use JUnit 4 rules
androidTestCompile 'com.android.support.test:rules:0.4.1'
// Set this dependency to build and run Espresso tests
androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
// Set this dependency to build and run UI Automator tests
androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.2'
androidTestCompile 'com.android.support:support-annotations:23.4.0'
// Optional -- Hamcrest library
androidTestCompile 'org.hamcrest:hamcrest-library:1.3'
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support:design:25.3.1'
compile 'com.android.support:cardview-v7:23.4.0'
compile 'com.android.support:recyclerview-v7:23.4.0'
}
Just try it, Changes on Gradle file.
compileSdkVersion 27
buildToolsVersion "27.0.0"
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:27.0.0'
implementation 'com.android.support:design:27.0.0'
testImplementation 'junit:junit:4.12'
As I can see this post is quite old but I thought would be good if in case someone else get the same issue
Just go to style.xml file (which is under value) and give extension to your theme with 'Base' For exmaple:
change
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.NoActionBar">
You might be getting this error
You need to use a Theme.AppCompat theme (or descendant) with the design library.
I found a work around for this that requires you to explicitly define a theme for Coordinator layout
<android.support.design.widget.CoordinatorLayout
android:theme="@style/AppTheme.NoActionBar"
...
...>
Make sure that the theme you use is child of Theme.AppCompat
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