我正在尝试使用新的Android P FloatingActionButton,这是com.google.android.material.floatingactionbutton.FloatingActionButton
的一部分,我收到了这个警告:
VisibilityAwareImageButton.setVisibility只能从同一个库组中调用(groupId = com.google.android.material)
import com.google.android.material.floatingactionbutton.FloatingActionButton
import android.view.View
class MainActivity : AppCompatActivity() {
lateinit var demoFab: FloatingActionButton
override fun onCreate(savedInstanceState: Bundle?) {
demoFab = findViewById(R.id.demoFab)
demoFab.visibility = View.VISIBLE // the warning is here
}
}
我尝试过搜索,唯一的搜索结果是关于响应UI可见性更改:
https://developer.android.com/training/system-ui/visibility
我试着探索如何在VISIBLE
包中找到com.google.android.material
int值,并且我找到的唯一一个是com.google.android.material.floatingactionbutton.FloatingActionButton.VISIBLE
,但警告仍然存在。
buildscript {
ext.kotlin_version = '1.2.41'
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.2.0-alpha14'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath "com.google.gms:oss-licenses:0.9.2"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
mavenCentral()
maven { url "http://oss.sonatype.org/content/repositories/snapshots/" }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'com.google.gms.oss.licenses.plugin'
android {
compileSdkVersion 'android-P'
defaultConfig {
applicationId "com.codeforsanjose.maps.pacmap"
minSdkVersion 21
targetSdkVersion 'P'
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
splits {
abi {
enable true
reset()
include 'arm64-v8a', 'armeabi', 'armeabi-v7a', 'mips', 'x86', 'x86_64'
universalApk false
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
buildTypes {
release {
minifyEnabled true
shrinkResources true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.0.0-alpha1'
implementation 'androidx.constraintlayout:constraintlayout:1.1.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.0-alpha2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha2'
implementation 'com.mapbox.mapboxsdk:mapbox-android-sdk:5.5.2'
//implementation 'com.mapbox.mapboxsdk:mapbox-android-sdk:6.1.0'
implementation 'com.mapbox.mapboxsdk:mapbox-android-plugin-locationlayer:0.5.0'
implementation 'com.mapbox.mapboxsdk:mapbox-android-navigation:0.13.0'
implementation 'com.mapbox.mapboxsdk:mapbox-android-navigation-ui:0.13.0'
implementation 'com.google.android.gms:play-services-oss-licenses:15.0.1'
implementation 'com.google.code.gson:gson:2.8.2'
implementation 'com.squareup.moshi:moshi:1.5.0'
implementation 'com.squareup.okhttp3:logging-interceptor:3.10.0'
implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
implementation 'com.squareup.retrofit2:converter-moshi:2.4.0'
implementation "com.squareup.retrofit2:adapter-rxjava2:2.3.0"
implementation 'com.squareup.retrofit2:retrofit:2.4.0'
implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
implementation 'io.reactivex.rxjava2:rxkotlin:2.2.0'
}
我应该注意到我正在使用Android Studio 3.2版金丝雀14.这个版本似乎有一些报道的错误,我怀疑这是其中之一。
Android Studio 3.2版金丝雀15仍存在问题,但我找到了使用show()
和hide()
的解决方法
override fun onCreate(savedInstanceState: Bundle?) {
demoFab = findViewById(R.id.demoFab)
demoFab.show() // this works and doesn't have the warning
}
使用方法1
demoFab.show(); // in place of visible
demoFab.hide(); // in place of Invisible suppress the warning/error for me.
和方法2
@SuppressLint("RestrictedApi") // also suppressed the warning
private void setUp() {
....
}
似乎工作正常只是为了将其投射到视图。
(mFloatingActionButton as View).visibility = INVISIBLE
当然,您需要记住可见性可能会影响其他组件,因此您应该同时使用show()
和hide()
以确保其他组件得到更改通知。
使用:
myButton.hide();
myClearButton.hide();
一个典型的例子是:
在用户键入或关注EditText资源时隐藏和显示按钮:
检查用户是否正在键入或具有焦点:
mCommentField.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View view, boolean hasFocus) {
if (hasFocus) {
//user has focused
showBts();
} else {
//focus has stopped perform your desired action
hideButtons();
}
}
});
隐藏和显示按钮方法:
private void hideButtons() {
mCommentButton.hide();
mClearButton.hide();
}
private void showBts() {
mCommentButton. show();
mClearButton.show();
在您的xml中,默认情况下将按钮设置为不可见,以便它们仅在用户具有焦点或正在键入时显示/显示:
android:visibility="invisible"
最佳实践:
android:visibility="Gone"
使用可见性意味着您的视图不占用布局上的任何空间,而“不可见”将占用布局上不必要的空间
在此示例中:我的视图位于ViewHolder中,iam引用带有recylerview的片段中的按钮
这也有效:
findViewById(R.id.fab).setVisibility(View.GONE);
对于Kotlin,我有一个扩展方法
fun viewsVisibility(visibility: Int, vararg views: View) {
for (view in views) { view.visibility = visibility }
}
然后在代码中,您可以执行以下操作
viewsVisibility(View.VISIBLE, demoFab)
viewsVisibility(View.GONE, demoFab)
viewsVisibility(View.INVISIBLE, demoFab, addFab, removeFab)
错误将消失,这为任何可见性状态提供了灵活性,同时还包含要处理的视图列表。有很多次我需要一次处理多个视图,如最后一个示例行所示。
if(data){
fragmentPendingApprovalDetailsBinding.fabPendingList.show();
}else {
fragmentPendingApprovalDetailsBinding.fabPendingList.hide();
}