Android 闪屏崩溃（简单/菜鸟问题）

Question

我刚刚在我的应用程序中添加了一个启动画面（之前运行良好），我想知道这里是否有人足够聪明，可以发现我遇到的问题的根源。应用程序启动，启动屏幕显示，然后当它加载主布局（AppActivity.java / main.xml）时，应用程序强制关闭。 : (

package com.mkyong.android;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;

public class SplashScreen extends Activity {

private static final int SPLASH_TIME = 3 * 1000;// 3 seconds

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splashscreen);

    new Handler().postDelayed(new Runnable() {

        @Override
        public void run() {

            Intent intent = new Intent(SplashScreen.this,
                    AppActivity.class);
            startActivity(intent);

            SplashScreen.this.finish();

            overridePendingTransition(R.anim.appear, R.anim.disappear);

        }
    }, SPLASH_TIME);

    new Handler().postDelayed(new Runnable() {
          @Override
          public void run() {
                 } 
            }, SPLASH_TIME);

}


@Override
public void onBackPressed() {
    this.finish();
    super.onBackPressed();
}
}

LogCat：

03-02 13:32:41.936: E/Trace(2065): error opening trace file: No such file or directory (2)
03-02 13:32:42.116: D/dalvikvm(2065): GC_FOR_ALLOC freed 61K, 8% free 2404K/2608K, paused 51ms, total 54ms
03-02 13:32:42.166: I/dalvikvm-heap(2065): Grow heap (frag case) to 6.000MB for 3686416-byte allocation
03-02 13:32:42.316: D/dalvikvm(2065): GC_FOR_ALLOC freed <1K, 4% free 6003K/6212K, paused 144ms, total 144ms
03-02 13:32:42.477: D/dalvikvm(2065): GC_CONCURRENT freed <1K, 4% free 6003K/6212K, paused 8ms+6ms, total 167ms
03-02 13:32:43.216: I/Choreographer(2065): Skipped 30 frames!  The application may be doing too much work on its main thread.
03-02 13:32:43.246: D/gralloc_goldfish(2065): Emulator without GPU emulation detected.
03-02 13:32:46.046: D/AndroidRuntime(2065): Shutting down VM
03-02 13:32:46.046: W/dalvikvm(2065): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
03-02 13:32:46.086: E/AndroidRuntime(2065): FATAL EXCEPTION: main
03-02 13:32:46.086: E/AndroidRuntime(2065): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.mkyong.android/com.mkyong.android.AppActivity}; have you declared this activity in your AndroidManifest.xml?
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1618)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.app.Activity.startActivityForResult(Activity.java:3370)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.app.Activity.startActivityForResult(Activity.java:3331)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.app.Activity.startActivity(Activity.java:3566)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.app.Activity.startActivity(Activity.java:3534)
03-02 13:32:46.086: E/AndroidRuntime(2065): at com.mkyong.android.SplashScreen$1.run(SplashScreen.java:24)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.os.Handler.handleCallback(Handler.java:725)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.os.Handler.dispatchMessage(Handler.java:92)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.os.Looper.loop(Looper.java:137)
03-02 13:32:46.086: E/AndroidRuntime(2065): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-02 13:32:46.086: E/AndroidRuntime(2065): at java.lang.reflect.Method.invokeNative(Native Method)
03-02 13:32:46.086: E/AndroidRuntime(2065): at java.lang.reflect.Method.invoke(Method.java:511)
03-02 13:32:46.086: E/AndroidRuntime(2065): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-02 13:32:46.086: E/AndroidRuntime(2065): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-02 13:32:46.086: E/AndroidRuntime(2065): at dalvik.system.NativeStart.main(Native Method)
03-02 13:32:50.336: I/Process(2065): Sending signal. PID: 2065 SIG: 9

清单：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mkyong.android"
    android:versionCode="1"
    android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />

<application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".SplashScreen"
            android:theme="@android:style/Theme.Black.NoTitleBar" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
     <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity android:name=".main2"></activity>
        <activity android:name=".home"></activity>
        <activity android:name=".App2Activity"></activity>
        <activity
            android:label="@string/app_name"
            android:name=".AppActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>      
</application>
</manifest>

Answer 1

 Unable to find explicit activity class {com.mkyong.android/com.mkyong.android.AppActivity}; have you declared this activity in your AndroidManifest.xml?

是吗？

将您的清单更改为：

    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mkyong.android"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".SplashScreen"
            android:theme="@android:style/Theme.Black.NoTitleBar" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".main2" >
        </activity>
        <activity android:name=".home" >
        </activity>
        <activity android:name=".App2Activity" >
        </activity>
        <activity
            android:name=".AppActivity"
            android:label="@string/app_name" >

            <!-- <intent-filter> -->
            <!-- <action android:name="android.intent.action.MAIN" /> -->


            <!-- <category android:name="android.intent.category.LAUNCHER" /> -->
            <!-- </intent-filter> -->
        </activity>
    </application>

</manifest>

您真的需要 2 个启动器吗？我评论了一个。 （还要感谢@Raghav，没有注意到 2 个<application> 标签）

Answer 2

从文本本身来看，这个例外太明显了..

 have you declared this activity in your AndroidManifest.xml?

请在您的 Manifest 文件中声明 AppActivity。 并且只使用一个 Application 标签。

One android application holds only one Application tag

Answer 3

就像 Raghav Sood 评论和 Karan_Rana 回答一样。
Android 无法打开 Appactivity.class，因为 Android 不知道它存在。
所以你需要在 Manifest 中声明它。所以Android知道它的存在以及它存在的位置。

 <activity android:name="com.mkyong.android/com.mkyong.android.AppActivity"></activity>

如果您将其添加到应用程序标记中的清单中，它应该可以工作。或者你会因为另一个问题而得到另一个错误;)