英文:
Android : App Crash After Included Toolbar
问题
以下是您提供的内容的翻译：
首次在Android中创建工具栏
styles.xml
<resources>
<!-- 应用程序的基本主题。 -->
<style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
<!-- 在此处自定义您的主题。 -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
</resources>
在将其更改为NoActionBar后，它显示错误android.widget.LinearLayout无法转换为androidx.appcompat.widget.Toolbar，即使将其更改为RelativeLayout也会出现相同的错误。
首先，我创建一个新的XML布局用于工具栏，根元素是Toolbar，在XML布局中，我无法创建<Toolbar>选项，因为它显示错误：
“View需要API级别21（当前最小为16）：android.support.v7.widget...它也显示错误，然后我尝试迁移到AndroidX。
然后，我使用新的XML文件创建了我的工具栏，根元素为RelativeLayout。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
app:titleTextColor="@android:color/white"
android:background="?attr/colorPrimary"
/>
</RelativeLayout>
然后，我将工具栏包含在activity_main.xml中。
<include
android:id="@+id/toolbar"
layout="@layout/toolbar"
/>
然后，我在Activity.java中声明了它。
package com.Karth.check;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import androidx.appcompat.widget.Toolbar;
public class MainActivity extends AppCompatActivity {
Toolbar mToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar=findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
}
}
我运行我的应用程序以检查是否已添加，但我的应用程序崩溃并显示错误。
2020-08-04 17:50:17.973 18038-18038/com.Karth.check E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.Karth.checkslate, PID: 18038
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Karth.check/com.Karth.check.MainActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at androidx.appcompat.app.AppCompatDelegateImpl.setSupportActionBar(AppCompatDelegateImpl.java:421)
at androidx.appcompat.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:150)
at com.Karth.checkslate.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Karth.check">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 30
buildToolsVersion "30.0.1"
defaultConfig {
applicationId "com.Karth.check"
minSdkVersion 16
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation 'androidx.appcompat:app
<details>
<summary>英文:</summary>
First Time Creating Toolbar in Android
styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
</resources>
It Shows me a Error `android.widget.LinearLayout cannot be cast to androidx.appcompat.widget.Toolbar `after i change that into `NoActionBar` even i change that into RelativeLayout then also same Error
First I create a New Xml Layout For Toolbar With RootElement as Toolbar inside the Xml Layout i can't Create a <Toolbar>option Bcoz It Shows the Error
`" View requires API level 21 (current min is 16): <Toolbar> "` for that i try to add `android.support.v7.widget...` it also Shows The Error and i try to Migrate to AndroidX
After that i create my Toolbar with new Xml File as RootElement as RelativeLayout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
app:titleTextColor="@android:color/white"
android:background="?attr/colorPrimary"
/>
</RelativeLayout>
Then i include that Toolbar in activity_main.xml
<include
android:id="@+id/toolbar"
layout="@layout/toolbar"
/>
Then i declare that in Activity.java
package com.Karth.check;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import androidx.appcompat.widget.Toolbar;
public class MainActivity extends AppCompatActivity {
Toolbar mToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar=findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
}
}
i run my app to check whether it was added or not..but my app was crashed and Showing error
2020-08-04 17:50:17.973 18038-18038/com.Karth.check E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.Karth.checkslate, PID: 18038
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Karth.check/com.Karth.check.MainActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at androidx.appcompat.app.AppCompatDelegateImpl.setSupportActionBar(AppCompatDelegateImpl.java:421)
at androidx.appcompat.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:150)
at com.Karth.checkslate.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:193) 
at android.app.ActivityThread.main(ActivityThread.java:6669) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 
Manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Karth.check">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 30
buildToolsVersion "30.0.1"
defaultConfig {
applicationId "com.Karth.check"
minSdkVersion 16
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation 'androidx.appcompat:appcompat:1.0.0'
implementation 'com.google.android.material:material:1.1.0'
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
</details>
# 答案1
**得分**: 3
有2个问题：
> “此 Activity 已经由窗口装饰提供了操作栏”
将您的应用主题更改为：
```xml
<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
“android.widget.LinearLayout 无法转换为 androidx.appcompat.widget.Toolbar”
在您的布局中，将 include 标签更改为：
<include layout="@layout/toolbar" />
英文:
There are 2 issues:
> This Activity already has an action bar supplied by the window decor
Change your app theme to:
<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
> android.widget.LinearLayout cannot be cast to androidx.appcompat.widget.Toolbar
Change in your layout the include tag to:
<include layout="@layout/toolbar" />
答案2
得分: 1
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