來自相同許可權組的多個執行時許可權

Created: November-22, 2018

在清單中，我們從兩個組中獲得了危險的執行時許可權。

<!-- Required to read and write to shredPref file. -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

<!-- Required to get location of device. -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

在需要許可權的活動中。請注意，在任何需要許可權的活動中檢查許可權非常重要，因為在應用程式處於後臺時可以撤消許可權，然後應用程式將崩潰。

final private int REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS = 124;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.act_layout);
    
    // A simple check of whether runtime permissions need to be managed 
    if (Build.VERSION.SDK_INT >= 23) {
        checkMultiplePermissions();
    }

我們只需要從每個組中請求其中一個的許可權，並且除非使用者撤消該許可權，否則授予該組的所有其他許可權。

private void checkMultiplePermissions() {

    if (Build.VERSION.SDK_INT >= 23) {
        List<String> permissionsNeeded = new ArrayList<String>();
        List<String> permissionsList = new ArrayList<String>();
        
        if (!addPermission(permissionsList, android.Manifest.permission.ACCESS_FINE_LOCATION)) {
            permissionsNeeded.add("GPS");
        }

        if (!addPermission(permissionsList, android.Manifest.permission.READ_EXTERNAL_STORAGE)) {
            permissionsNeeded.add("Read Storage");
        }
        
        if (permissionsList.size() > 0) {
            requestPermissions(permissionsList.toArray(new String[permissionsList.size()]),
                    REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
            return;
        }
    }
}

private boolean addPermission(List<String> permissionsList, String permission) {
    if (Build.VERSION.SDK_INT >= 23)

        if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
            permissionsList.add(permission);

            // Check for Rationale Option
            if (!shouldShowRequestPermissionRationale(permission))
                return false;
        }
    return true;
}

這涉及使用者允許或不允許許可權的結果。在此示例中，如果不允許許可權，則應用程式將被終止。

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS: {
        
            Map<String, Integer> perms = new HashMap<String, Integer>();
            // Initial
            perms.put(android.Manifest.permission.ACCESS_FINE_LOCATION, PackageManager.PERMISSION_GRANTED);
            perms.put(android.Manifest.permission.READ_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
            
            // Fill with results
            for (int i = 0; i < permissions.length; i++)
                perms.put(permissions[i], grantResults[i]);
            if (perms.get(android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                    && perms.get(android.Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
                // All Permissions Granted
                return;
            } else {
                // Permission Denied
                if (Build.VERSION.SDK_INT >= 23) {
                    Toast.makeText(
                            getApplicationContext(),
                            "My App cannot run without Location and Storage " +
                                    "Permissions.\nRelaunch My App or allow permissions" +
                                    " in Applications Settings",
                            Toast.LENGTH_LONG).show();
                    finish();
                }
            }
        }
        break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}