Question

在Android权限检查中我正在检查 onResume（）中的相机权限，但是当 -

用户允许许可
App正在使用相机
用户不要关闭应用并从通知面板转到设置屏幕
停用该应用的相机权限

当用户回来时，app不会要求相机许可。

Answer 1

经过大量搜索后找到答案 -

如果您在应用运行时更改权限，则无法回拨（设置 - ＆gt;应用 - ＆gt;权限 - ＆gt;关闭权限）

但它会再次调用onCreate方法。因此，您需要检查 onCreate（）

中的权限

Answer 2

为扩展Activity的权限创建抽象类：

public abstract class RuntimePermission extends Activity {
private SparseIntArray mErrorString;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash);
    mErrorString = new SparseIntArray();
}

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

    int permissionCheck = PackageManager.PERMISSION_GRANTED;

    for(int permission: grantResults){
        permissionCheck = permissionCheck + permission;
    }

    if(grantResults.length > 0 && PackageManager.PERMISSION_GRANTED == permissionCheck){
        onPermissionsGranted(requestCode);
    }
    else{
        Snackbar.make(findViewById(android.R.id.content), mErrorString.get(requestCode),
                Snackbar.LENGTH_INDEFINITE).setAction("ENABLE", new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                intent.setData(Uri.parse("package:"+getPackageName()));
                intent.addCategory(Intent.CATEGORY_DEFAULT);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
                startActivity(intent);
            }
        }).show();
    }
}

public abstract void onPermissionsGranted(int requestCode);

public void requestAppPermission(final String[] requestedPermissions, final int stringId, final int requestCode) {
    mErrorString.put(requestCode, stringId);

    int permissionCheck = PackageManager.PERMISSION_GRANTED;
    boolean showRequestPermissions = false;

    for (String permission : requestedPermissions) {
        permissionCheck = permissionCheck + ContextCompat.checkSelfPermission(this, permission);
        showRequestPermissions = showRequestPermissions || ActivityCompat.shouldShowRequestPermissionRationale(this, permission);
    }


    if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
        if (showRequestPermissions) {
            Snackbar.make(findViewById(android.R.id.content), stringId, Snackbar.LENGTH_INDEFINITE).setAction("YES", new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    ActivityCompat.requestPermissions(RuntimePermission.this, requestedPermissions, requestCode);
                }
            }).show();
        } else {
            ActivityCompat.requestPermissions(this, requestedPermissions, requestCode);
        }
    }
    else{
        onPermissionsGranted(requestCode);
    }
}
}

然后由你的类扩展这个抽象类：

public class YourClass extends RuntimePermission {
    private static final int REQUEST_PERMISSION = 10;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.your_class_activity);


    }
    @Override
    protected void onResume() {
        super.onResume();


        requestAppPermission(new String[]
                        {
                                Manifest.permission.CAMERA


                        },
                R.string.approve_permissions, REQUEST_PERMISSION); //R.string.approve_permissions is your text for snackbar
    }
    @Override
    public void onPermissionsGranted(int requestCode) {
        // your logic
    }
}

应用程序打开时如何检查权限更改？

2 个答案: