手电筒需要哪些权限？答案

【问题标题】：Which permissions are required for Flashlight?手电筒需要哪些权限？
【发布时间】：2016-07-15 13:40:51
【问题描述】：

我使用了<uses-permission android:name="android.permission.FLASHLIGHT" />，但我的应用不断崩溃。我正在制作一个 Torch 应用程序。这是我的清单代码：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.Torch">
    <uses-permission android:name="android.permission.FLASHLIGHT" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name="com.Torch.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

错误日志：

03-28 15:29:23.439 7163-7163/com.Torch E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.Torch, PID: 7163
 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Torch/com.Torch.MainActivity}: java.lang.RuntimeException: Fail to connect to camera service
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2493)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2555)
     at android.app.ActivityThread.access$800(ActivityThread.java:176)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1437)
     at android.os.Handler.dispatchMessage(Handler.java:111)
     at android.os.Looper.loop(Looper.java:194)
     at android.app.ActivityThread.main(ActivityThread.java:5576)
     at java.lang.reflect.Method.invoke(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:372)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:956)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751)
  Caused by: java.lang.RuntimeException: Fail to connect to camera service
     at android.hardware.Camera.<init>(Camera.java:637)
     at android.hardware.Camera.open(Camera.java:496)
     at com.Torch.MainActivity.onCreate(MainActivity.java:33)
     at android.app.Activity.performCreate(Activity.java:6005)
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2446)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2555) 
     at android.app.ActivityThread.access$800(ActivityThread.java:176) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1437) 
     at android.os.Handler.dispatchMessage(Handler.java:111) 
     at android.os.Looper.loop(Looper.java:194) 
     at android.app.ActivityThread.main(ActivityThread.java:5576) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:956) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751)

【问题讨论】：

在此处发布您的错误日志。
添加这个<uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" />
访问闪光灯需要这些权限。
Use camera flashlight in Android的可能重复
@IntelliJAmiya：它有效，但请查看link

标签： android android-permissions

【解决方案1】：

在清单中添加

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.hardware.camera.any" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-feature android:name="android.hardware.camera.flash" />

对于 Android M 设备，请务必请求许可

 if((ContextCompat.checkSelfPermission(getActivity(),Manifest.permission.FLASHLIGHT)  != PackageManager.PERMISSION_GRANTED) || 
                   (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA)  != PackageManager.PERMISSION_GRANTED)){
           requestPermissions(new String[]{Manifest.permission.FLASHLIGHT, Manifest.permission.CAMERA});
 }
 else{

 }



@Override
public void onRequestPermissionsResult(int requestCode, String[]     permissions, int[] grantResults) {

    boolean canUseCamera = false;
    boolean canUseFlash = false;

    switch (requestCode) {
        case PERMISSION_CODE_CAMERA: {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                canUseCamera  = true;
            }
            if (grantResults.length > 1
                    && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                canUseFlash = true;
            }

            if (!canUseCamera || !canUseFlash ) {
                Toast.makeText(getActivity(), "Cannot use this feature without requested permission", Toast.LENGTH_SHORT).show();
            } else {
                // do your actual task
            }
        }
    }
}

【讨论】：

感谢 M 设备权限，但请查看我最近的 cmets
该代码在 Marshmallow 中无法运行，它崩溃了。似乎应用程序的启动迭代了 3 个周期并且没有 logcat。
你不应该在任何监听器中添加代码。尝试将它添加到主要活动或活动 onCreate
是的，我写在onCreate
似乎应用程序的启动迭代了3个周期并且没有logcat，在前面的评论中提到过。当我手动授予权限时它起作用了。

【解决方案2】：

仅添加相机权限...使用 api 22

【讨论】：