你好,我想更改默认活动。但是当我这样做时,应用程序根本不会启动,也没有任何错误。
<activity
android:name="com.example.dimmer.MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.dimmer.DevicesActivity" >
</activity>
这样MainActivity就可以无问题启动。当我按下按钮时,它也会进入Device activity。所以一切都很顺利。
现在我需要将DeviceActivity设置为默认活动页面。
我像这样更改Manifest:
<activity
android:name="com.example.dimmer.DevicesActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.dimmer.MainActivity" >
</activity>
但现在应用程序无法启动。没有错误,控制台中没有任何输出。它似乎什么都没做, 可能是什么问题?
开始写以下错误信息 ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.dimmer/.MainActivity } [2014-05-16 21:17:10 - Dimmer] ActivityManager: java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.dimmer/.MainActivity } from null (pid=13093, uid=2000) requires null
完整的清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.dimmer"
android:versionCode="1"
android:versionName="1.0"
android:hardwareAccelerated="false">
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="14" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.dimmer.DevicesActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.dimmer.MainActivity" >
</activity>
</application>
</manifest>
[2014-05-16 22:13:25 - Dimmer] Android Launch!
[2014-05-16 22:13:25 - Dimmer] adb is running normally.
[2014-05-16 22:13:25 - Dimmer] Performing com.example.dimmer.MainActivity activity launch
[2014-05-16 22:13:26 - Dimmer] Uploading Dimmer.apk onto device 'SH17VT514235'
[2014-05-16 22:13:26 - Dimmer] Installing Dimmer.apk...
[2014-05-16 22:13:29 - Dimmer] Success!
[2014-05-16 22:13:29 - Dimmer] Starting activity com.example.dimmer.MainActivity on device SH17VT514235
[2014-05-16 22:13:29 - Dimmer] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.dimmer/.MainActivity }
[2014-05-16 22:13:29 - Dimmer] ActivityManager: java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.dimmer/.MainActivity } from null (pid=15458, uid=2000) requires null
android:exported
设置为true
并尝试... - Lal