(ix) Android access system

One, WebView request permission Instance

1.WebView the XML layout file that gets access to the Web page and the programs in Mainactivity are as follows

<webview
    Android:layout_width= "Match_parent"
    android:layout_height= "Wrap_content"
    Android:id= "@+id/wv" ></WebView>

webview= (WebView) Findviewbyid (R.ID.WV);
Webview.loadurl (http://www.jikexueyuan.com);

2. If you want to gain access, you also need to define uses-permission access to the Internet in the Androidmanifest.xml file

<uses-permission android:name= "Android.permission.INTERNET"/>

Second, add permission check for code

1. Customize a Hello class, which defines a SayHello static method, if you want to access the global information, you need to pass a context parameter, check the permission to invoke the context of the checkcallingorselfpermission method to determine whether the permission_granted or permission_denied in the Packagemanager is invoked through the permission

public class Hello {
    private static final String say_hello= "Com.example.shiyanshi.checkpermissionincode.permission.SYA_HELLO";
    public static void SayHello (

Context

Context) {
        int Permission=context.

Checkcallingorselfpermission

(Say_hello);
        

packagemanager.permission_granted

) {//and also

Packagemanager.permission_denied

            throw new SecurityException ("Unable to gain access to Com.example.shiyanshi.checkpermissionincode.permission.SYA_HELLO");
        }
        System.out.println ("has been granted permission");
    }
}

2. Define permission permissions in Androidmanifest.xml, and use Uses-permission to allow access to permissions, otherwise it will not be passed in the permission check code above

<permission android:name= "Com.example.shiyanshi.checkpermissionincode.permission.SYA_HELLO"/>
<uses-permission android:name= "Com.example.shiyanshi.checkpermissionincode.permission.SYA_HELLO"/>

3. Call this method directly in Mainactivity Hello.sayhello (this).

Iii. adding permission checks for basic components

Androidmanifest.xml files in 1.app module

An application in the app first defines a permission, and then in other programs the activity to be invoked describes the permissions of the application, and finally the activity that declares the permission is called in Anotherapp to declare uses-permission.

<?xml version= "1.0" encoding= "Utf-8"?>
<manifest xmlns:android= "Http://schemas.android.com/apk/res/android"
    Package= "Com.example.shiyanshi.staranotheratythroughpermissionctrl" >
   

<permission android:name= "Com.example.shiyanshi.staranotheratythroughpermissionctrl.permission.Aty2"/>

    <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>
        <activity
            Android:name= ". Main2activity "
            

android:permission= "Com.example.shiyanshi.staranotheratythroughpermissionctrl.permission.Aty2" >

            <intent-filter>
                

<action android:name= "Com.example.shiyanshi.staranotheratythroughpermissionctrl.intent.action.Main2Activity" />
<category android:name= "Android.intent.category.DEFAULT"/> <!--implicit intent invoke using-

            </intent-filter>
        </activity>
    </application>

</manifest>

Androidmanifest.xml in 2.anotherapp

<?xml version= "1.0" encoding= "Utf-8"?>
<manifest xmlns:android= "Http://schemas.android.com/apk/res/android"
    Package= "Com.example.shiyanshi.anotherapp" >

    

<uses-permission android:name= "Com.example.shiyanshi.staranotheratythroughpermissionctrl.permission.Aty2"/ >

    <application
        Android:allowbackup= "true"
        android:icon= "@mipmap/ic_launcher"
        Android:label= "@string/app_name"
        Android:supportsrtl= "true"
        Android:theme= "@style/apptheme" >
        <act    ivity android:name= ". Mainactivity ">
    <intent-filter>
        <action android:name= "Android.intent.action.MAIN"/>
        <category android:name= "Android.intent.category.LAUNCHER"/>
    </intent-filter>
</activity>
    </application>

</manifest>

Calls in 3.anotherapp

StartActivity (New Intent ("Com.example.shiyanshi.staranotheratythroughpermissionctrl.intent.action.Main2Activity "));

(ix) Android rights system