更改了应用程序的启动活动，现在应用程序将无法启动

Question

我正在开发一个包含5个左右活动的应用，我尝试将我的启动器活动从MapsActivity更改为MainActivity。 我一直有MapsActivity，但今天我添加了MainActivity并简单地交换了MapsActiviy和MainActivity的android：name属性。 突然间我的应用程序无法打开。 如果我试图运行该应用程序，我会看到该图标出现在Nexus 6P和HTC One M7上，但点击图标后，没有任何反应。 我所做的就是更改清单FROM：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MapsActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    ............
    Skips Several Lines
    ............

    <activity
        android:name=".ChatActivity"
        android:screenOrientation="portrait" />
    <activity android:name=".MainActivity"/>
    <activity android:name=".TotalsListViewActivity" />
    <activity android:name=".PlacesListViewActivity" />
</application>

至：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    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>

   ............
    Skips Several Lines
    ............

    <activity
        android:name=".ChatActivity"
        android:screenOrientation="portrait" />
    <activity android:name=".MapsActivity"/>
    <activity android:name=".TotalsListViewActivity" />
    <activity android:name=".PlacesListViewActivity" />
</application>

我阅读了几篇帖子，例如https://stackoverflow.com/a/3632061/4937741，关于如何更改清单可能不足以让Android Studio更改其应用程序的运行配置。 所有帖子似乎都说要转到“运行”>“编辑配置”并确保将新的默认启动器活动设置为运行而不是旧的启动器活动。 在我的情况下，它始终设置为运行默认活动：

我已经尝试将其更改为显式运行MainActivity，但这没有帮助。 我甚至尝试删除MapsActivity，但这没有帮助。 LogCat似乎没有显示任何错误：

   10-19 00:48:04.383 20349-20407/? D/ClClient: Not sending keepalive.  Current connection state=STOPPED

                                             --------- beginning of system
10-19 00:48:05.075 914-3870/? I/ActivityManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.artfara.apps.kipper/.MainActivity (has extras)} from uid 10029 on display 0
10-19 00:48:05.077 513-2908/? D/audio_hw_primary: out_set_parameters: enter: usecase(1: low-latency-playback) kvpairs: routing=2
10-19 00:48:05.091 513-2908/? D/audio_hw_primary: select_devices: out_snd_device(2: speaker) in_snd_device(0: none)
10-19 00:48:05.091 513-2908/? D/msm8974_platform: platform_send_audio_calibration: sending audio calibration for snd_device(2) acdb_id(15)
10-19 00:48:05.092 513-2908/? I/soundtrigger: audio_extn_sound_trigger_update_device_status: device 0x2 of type 0 for Event 1
10-19 00:48:05.105 513-2908/? D/audio_hw_primary: enable_snd_device: snd_device(2: speaker)
10-19 00:48:05.109 513-2908/? D/audio_hw_primary: enable_audio_route: apply and update mixer path: low-latency-playback speaker
10-19 00:48:05.132 1350-1350/? I/GrantPermissionsActivity: No package: null
                                                           android.content.pm.PackageManager$NameNotFoundException
                                                               at android.app.ApplicationPackageManager.getPackageInfo(ApplicationPackageManager.java:137)
                                                               at com.android.packageinstaller.permission.ui.GrantPermissionsActivity.getCallingPackageInfo(GrantPermissionsActivity.java:335)
                                                               at com.android.packageinstaller.permission.ui.GrantPermissionsActivity.onCreate(GrantPermissionsActivity.java:100)
                                                               at android.app.Activity.performCreate(Activity.java:6251)
                                                               at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                               at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                               at android.os.Handler.dispatchMessage(Handler.java:102)
                                                               at android.os.Looper.loop(Looper.java:148)
                                                               at android.app.ActivityThread.main(ActivityThread.java:5422)
                                                               at java.lang.reflect.Method.invoke(Native Method)
                                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
10-19 00:48:05.141 914-3581/? W/InputMethodManagerService: Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@2335ed6 attribute=null, token = android.os.BinderProxy@182e308
10-19 00:48:05.637 513-2908/? D/audio_hw_primary: disable_audio_route: reset and update mixer path: low-latency-playback speaker
10-19 00:48:05.639 513-2908/? D/audio_hw_primary: disable_snd_device: snd_device(2: speaker)
10-19 00:48:05.654 513-2908/? I/soundtrigger: audio_extn_sound_trigger_update_device_status: device 0x2 of type 0 for Event 0
10-19 00:48:05.932 914-3870/? D/WifiService: acquireWifiLockLocked: WifiLock{NlpWifiLock type=2 binder=android.os.BinderProxy@4c604e5}
10-19 00:48:05.986 914-3912/? D/WifiService: releaseWifiLockLocked: WifiLock{NlpWifiLock type=2 binder=android.os.BinderProxy@4c604e5}
10-19 00:48:06.011 3315-3315/? I/wpa_supplicant: wlan0: WPA: Group rekeying completed with f0:b2:e5:bd:99:c0 [GTK=CCMP]
10-19 00:48:06.012 914-3106/? D/IpReachabilityMonitor: probing ip=10.31.112.1%5
10-19 00:48:06.038 19446-19453/? E/DataBuffer: Internal data leak within a DataBuffer object detected!  Be sure to explicitly call release() on all DataBuffer extending objects when you are done with them. (internal object: com.google.android.gms.common.data.DataHolder@7858ede)
10-19 00:48:07.091 914-3121/? D/ConnectivityService: notifyType CAP_CHANGED for NetworkAgentInfo [WIFI () - 168]
10-19 00:48:07.105 914-3121/? D/ConnectivityService: updateNetworkScore for NetworkAgentInfo [WIFI () - 168] to 56
10-19 00:48:08.712 668-701/? I/Finsky: [1983] com.google.android.finsky.c.e.run(2152): Replicating app states via AMAS.
10-19 00:48:08.744 914-3261/? I/sensors: batch
10-19 00:48:08.744 914-3261/? I/sensors: activate
10-19 00:48:08.742 4376-4376/? W/Binder_C: type=1400 audit(0.0:141173): avc: denied { ioctl } for path="socket:[1339276]" dev="sockfs" ino=1339276 ioctlcmd=7704 scontext=u:r:system_server:s0 tcontext=u:r:system_server:s0 tclass=unix_stream_socket permissive=0
10-19 00:48:08.742 4376-4376/? W/Binder_C: type=1400 audit(0.0:141174): avc: denied { ioctl } for path="socket:[1339276]" dev="sockfs" ino=1339276 ioctlcmd=7704 scontext=u:r:system_server:s0 tcontext=u:r:system_server:s0 tclass=unix_stream_socket permissive=0
10-19 00:48:08.753 914-3039/? I/hubconnection: sensorhub said: 'batch 4 flags:0, sampling_rate_Hz:10.00, max_report_latency_us:0'
10-19 00:48:08.753 914-3039/? I/hubconnection: sensorhub said: 'activate 4 enable:1'
10-19 00:48:08.876 668-701/? I/Finsky: [1983] com.google.android.finsky.c.c.a(314): Completed 0 account content syncs with 0 successful.
10-19 00:48:08.878 668-668/? I/Finsky: [1] com.google.android.finsky.services.j.a(148): Installation state replication succeeded.
10-19 00:48:08.896 19619-19625/? W/SQLiteConnectionPool: A SQLiteConnection object for database '/data/user/0/com.google.android.gms/databases/metrics.db' was leaked!  Please fix your application to end transactions in progress properly and to close the database when it is no longer needed.
10-19 00:48:08.897 19619-19625/? W/SQLiteConnectionPool: A SQLiteConnection object for database '/data/user/0/com.google.android.gms/databases/help_responses.db' was leaked!  Please fix your application to end transactions in progress properly and to close the database when it is no longer needed.
10-19 00:48:08.897 19619-19625/? W/SQLiteConnectionPool: A SQLiteConnection object for database '/data/user/0/com.google.android.gms/databases/auto_complete_suggestions.db' was leaked!  Please fix your application to end transactions in progress properly and to close the database when it is no longer needed.
10-19 00:48:09.061 914-3581/? I/sensors: activate
10-19 00:48:09.064 914-3039/? I/hubconnection: sensorhub said: 'activate 4 enable:0'
10-19 00:48:09.426 14682-14682/? I/ServiceManager: Waiting for service AtCmdFwd...
10-19 00:48:10.427 14682-14682/? I/ServiceManager: Waiting for service AtCmdFwd...
10-19 00:48:11.429 14682-14682/? I/ServiceManager: Waiting for service AtCmdFwd...
10-19 00:48:12.430 14682-14682/? I/ServiceManager: Waiting for service AtCmdFwd...
10-19 00:48:13.432 14682-14682/? I/ServiceManager: Waiting for service AtCmdFwd...
10-19 00:48:14.383 20349-20407/? D/ClClient: Not sending keepalive.  Current connection state=STOPPED
10-19 00:48:14.433 14682-14682/? W/Atfwd_Sendcmd: AtCmdFwd service not published, waiting... retryCnt : 3
10-19 00:48:17.418 24712-14857/? D/com.gsamlabs.bbm.lib.NotifyingService: ===:56:3930:28.5:2
10-19 00:48:21.824 914-7312/? D/NetlinkSocketObserver: NeighborEvent{elapsedMs=82913527, 10.31.112.1, [0026980A93C1], RTM_NEWNEIGH, NUD_STALE}
10-19 00:48:24.383 20349-20407/? D/ClClient: Not sending keepalive.  Current connection state=STOPPED

我还会抛出MainActivity.java和activity_main.xml：

MainActivity.java

import android.*;
import android.Manifest;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d("MainActivity","onCreate");
    } 
}

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.artfara.apps.kipper.MainActivity">

    <TextView
        android:text="TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginStart="108dp"
        android:layout_marginTop="117dp"
        android:id="@+id/textView" />
</RelativeLayout>

在此先感谢您的帮助！

Answer 1

也许您需要明确设置默认活动。

<category android:name="android.intent.category.DEFAULT"/>

尝试将其放在MapsActivity intent过滤器中。

<activity android:name=".MapsActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.DEFAULT"/>
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

Answer 2

当找不到给定的包，应用程序或组件名称时抛出此异常，因此请检查：

1）您的包裹名称是否正确。

2）您提到的LAUNCHER ACTIVITY活动确实存在于已定义的包中

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="check_here">