我已经实现了一个启动画面，在3秒后完成并加载Main活动，但是，它一直崩溃并且说应用程序已停止。
虽然我成功地修改了清单，但是，我确信问题源于清单本身。
对此问题的任何帮助将不胜感激。
在Android上很新，如果缺少任何信息，请道歉。
抱歉凌乱的LogCat！
SplashScreen.java
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class SplashScreen extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash_screen);
Thread myThread = new Thread() {
@Override
public void run() {
try {
sleep (3000);
Intent intent = new Intent (getApplicationContext(),MainActivity.class);
startActivity(intent);
finish();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
myThread.start();
}
}
清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.benf.myapplication">
<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=".SplashScreen"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".MainActivity"/>
</application>
</manifest>
logcat的
01-30 12:31:37.824 4954-4954/? I/zygote: Not late-enabling -Xcheck:jni (already on)
01-30 12:31:38.109 4954-4954/? W/zygote: Unexpected CPU variant for X86 using defaults: x86
01-30 12:31:38.529 4954-4954/com.example.benf.myapplication I/InstantRun: starting instant run server: is main process
01-30 12:31:38.939 4954-4981/com.example.benf.myapplication D/OpenGLRenderer: HWUI GL Pipeline
01-30 12:31:39.040 4954-4981/com.example.bef.myapplication I/zygote: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
01-30 12:31:39.040 4954-4981/com.example.benf.myapplication I/OpenGLRenderer: Initialized EGL, version 1.4
01-30 12:31:39.040 4954-4981/com.example.benf.myapplication D/OpenGLRenderer: Swap behavior 1
01-30 12:31:39.041 4954-4981/com.example.benf.myapplication W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
01-30 12:31:39.041 4954-4981/com.example.benf.myapplication D/OpenGLRenderer: Swap behavior 0
01-30 12:31:39.046 4954-4981/com.example.benf.myapplication D/EGL_emulation: eglCreateContext: 0xb060ea60: maj 2 min 0 rcv 2
01-30 12:31:39.049 4954-4981/com.example.benf.myapplication D/EGL_emulation: eglMakeCurrent: 0xb060ea60: ver 2 0 (tinfo 0xa8849650)
01-30 12:31:39.177 4954-4981/com.example.benf.myapplication D/EGL_emulation: eglMakeCurrent: 0xb060ea60: ver 2 0 (tinfo 0xa8849650)
01-30 12:31:42.189 4954-4954/com.example.benf.myapplication D/AndroidRuntime: Shutting down VM
01-30 12:31:42.192 4954-4954/com.example.benf.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.benf.myapplication, PID: 4954
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.benf.myapplication/com.example.benf.myapplication.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:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
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 android.support.v7.app.AppCompatDelegateImplV9.setSupportActionBar(AppCompatDelegateImplV9.java:201)
at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:129)
at com.example.benf.myapplication.MainActivity.onCreate(MainActivity.java:24)
at android.app.Activity.performCreate(Activity.java:6999)
at android.app.Activity.performCreate(Activity.java:6990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
答案 0 :(得分：2)
您尚未为MainActivity指定任何主题。你在MainActivity中使用工具栏我想你的应用程序主题是android:theme="@style/AppTheme"，它也提供了操作栏。所以这种情况会产生冲突。
在您的活动声明中更改为
<activity android:name=".MainActivity"
android:theme="@style/AppTheme.NoActionBar"/>
答案 1 :(得分：2)
在MainActivity课程中，您尝试添加工具栏，这就产生了问题。因为这个<activity android:name=".MainActivity"/>
应用程序主题将应用于您在Application标记android:theme="@style/AppTheme"
此主题本身也包含ActionBar。
将主题应用于您的MainActivity，就像您为SplashScreen活动所做的那样，
<activity android:name=".MainActivity"
android:theme="@style/AppTheme.NoActionBar"/>
答案 2 :(得分：0)
在清单中为MainActivity指定： -
<activity android:name=".MainActivity"
android:theme="@style/AppTheme.NoActionBar"/>