我正在尝试在 android 设备启动后写入文件。我在这里检查了与此主题相关的所有内容，但没有一个对我有用。我的手机是华为荣耀（H30-U10），已经root了。安卓版本 4.2.2。这是我的代码：
安卓清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="bog.ddrc.technicianmobile"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:name="bog.ddrc.technicianmobile.App"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="bog.ddrc.technicianmobile.activities.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>
<receiver
android:enabled="true"
android:name="bog.ddrc.technicianmobile.StartTMServiceAtBootReceiver"
android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
</manifest>
StartTMServiceAtBootReceiver.java：
public class StartTMServiceAtBootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String data = "text";
File path = Environment.getExternalStorageDirectory();
File file = new File(path, "test.txt");
try {
OutputStream os = new FileOutputStream(file);
os.write(data.getBytes());
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}