[英]Android : App Crash After Included Toolbar
第一次在 Android 中創建工具欄
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>
它向我顯示了一個錯誤android.widget.LinearLayout cannot be cast to androidx.appcompat.widget.Toolbar
轉換為NoActionBar
即使我將其更改為 RelativeLayout 然后也是相同的錯誤
首先,我為工具欄創建一個新的 Xml 布局,其中 RootElement 作為 Xml 布局內的工具欄,我無法創建選項 Bcoz 它顯示錯誤
" View requires API level 21 (current min is 16): <Toolbar> "
為此我嘗試添加android.support.v7.widget...
它還顯示錯誤,我嘗試遷移到 AndroidX
之后,我使用新的 Xml 文件作為 RootElement 作為 RelativeLayout 創建我的工具欄
<?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>
然后我將該工具欄包含在 activity_main.xml
<include
android:id="@+id/toolbar"
layout="@layout/toolbar"
/>
然后我在 Activity.java 中聲明
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);
}
}
我運行我的應用程序以檢查它是否已添加..但我的應用程序崩潰並顯示錯誤
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)
清單.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'
}
有2個問題:
This Activity already has an action bar supplied by the window decor
將您的應用主題更改為:
<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
android.widget.LinearLayout cannot be cast to androidx.appcompat.widget.Toolbar
在您的布局中將include
標簽更改為:
<include layout="@layout/toolbar" />
<style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
在您的樣式名稱中包含請求 ActionBar 的“DarkActionBar”。 因此,您有 2 個解決方案,使用另一個沒有 ActionBar 的主題,例如“Theme.MaterialComponents.Light.NoActionBar”,或者將其覆蓋為不請求 actionBar
第 1 步:Go 到您的 <Styles.xml> 添加
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
第 2 步:將Change <style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
為<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar" >
第 3 步:Go 到您的活動。xml 並刪除您的布局 id
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