在非Activity中请求危险权限

电玩女神 2022-09-30 09:40 161阅读 0赞

## 在非Activity中请求危险权限 ##

我们知道Android6.0之后对于危险权限需要动态申请。我们动态的请求权限，需要在activity调用requestPermissions()方法;然后在处理activity中的回调方法onRequestPermissionsResult()。

那么我们怎么在非Activity动态请求权限，又如何处理activity中的回调方法呢?

我的采取一个比较取巧的方法，通过创建一个BaseActivity类，继承Activity，不需要再manifest中注册。通过一个静态的Map集合，封装BaseActivity对象。在BaseActivity中设置监听回调的接口，将onRequestPermissionsResult()的参数全部给监听回调接口处理。

下面看示例代码：

BaseActivity

public class BaseActivity extends AppCompatActivity { 
    
        public void setRequestPermissionListener(RequestPermissionListener requestPermissionListener) {
            this.requestPermissionListener = requestPermissionListener;
        }
    
        public interface RequestPermissionListener { 
            void onRequestPermissionListener(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults);
        }
    
        private RequestPermissionListener requestPermissionListener;
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            //将BaseActivity设置到Map集合中
            ThreadLocalManager.tl.set(BaseActivity.this);
        }
    
        @Override
        public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            if (requestPermissionListener != null) {
                requestPermissionListener.onRequestPermissionListener(requestCode, permissions, grantResults);
            }
        }
    }

ThreadLocalManager：这个类封装了ThreadLocal，ThreadLocal底层是一个Map

public class ThreadLocalManager {
    
        public static ThreadLocal<Activity> tl = new ThreadLocal<>();
    }

MainActivity继承BaseActivity

public class MainActivity extends BaseActivity { 
    
        private TextView tv1;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            tv1 = (TextView) findViewById(R.id.tv1);
        }
    
        @Override
        protected void onResume() {
            super.onResume();
    
            tv1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                   String message = DeviceUtil.getDeviceId(getApplicationContext());
                   Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();
                }
            });
    
        }
    }

DeviceUtil

public class DeviceUtil { 
    
        private static boolean grant;
    
        @SuppressLint("HardwareIds")
        public static String getDeviceId(final Context context) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                if (ActivityCompat.checkSelfPermission(context, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
                    BaseActivity activity = (BaseActivity) ThreadLocalManager.tl.get();
                    activity.setRequestPermissionListener(new BaseActivity.RequestPermissionListener() {
                        @Override
                        public void onRequestPermissionListener(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
                            grant = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                            if (grant) {
                                Toast.makeText(context, "权限请求成功", Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
                    ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.READ_PHONE_STATE}, 0);
                } else {
                    grant = true;
                }
            } else {
                grant = true;
            }
            if (grant) {
                TelephonyManager manager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
                return manager.getDeviceId();
            }
            return "";
        }
    }

效果图;

![image][]

[image]: http://oe9ggtbcb.bkt.clouddn.com/%E5%9C%B0%E6%96%B9%E5%A4%A7%E5%B9%85%E5%BA%A6%E5%8F%91%E5%A4%A7%E5%B9%85%E5%BA%A6.gif