在扫码功能中使用PermissionsAndroid请求相机权限没有弹出权限弹窗并且报警告："Tried to use permissions API but the host Activity doesn't implement PermissionAwareActivity"，使用代码如下：

let array = new Array(PermissionsAndroid.PERMISSIONS.CAMERA,PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE);
PermissionsAndroid.requestMultiple(array)
    .then(res => {
        console.log("权限返回",res);
        if(res["android.permission.CAMERA"] !== 'granted' || res["android.permission.WRITE_EXTERNAL_STORAGE"] !== 'granted') {
              Alert.alert('提示', '请在手机的"设置-应用-授权管理"设置相机及存储权限');
        }else NativeModules.RNDiyModule.startActivity();
     });

该怎么解决呢？

解决方法：

网上查了资料，找到一个亲测好用的方法，使activity implement PermissionAwareActivity，然后重写以下4个方法：

int checkPermission(String permission, int pid, int uid);
int checkSelfPermission(String permission);
boolean shouldShowRequestPermissionRationale(String permission);
void requestPermissions(String[] permissions, int requestCode, PermissionListener listener);

并且定义 Callback 和 PermissionListener。

代码如下：

public class MainActivity extends AppCompatActivity implements DefaultHardwareBackBtnHandler,PermissionAwareActivity {
    ReactRootView reactRootView;
    ReactInstanceManager mReactInstanceManager;
    private @Nullable Callback mPermissionsCallback;
    private @Nullable PermissionListener mPermissionListener;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);
        reactRootView = (ReactRootView) findViewById(R.id.root);
        mReactInstanceManager = ((ReactApplication) getApplication()).getReactNativeHost().getReactInstanceManager();
        ...
    }

    @Override
    public void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
    }

    @Override
    public Resources getResources() {
        Resources res = super.getResources();
        ...
        return res;
    }

    @Override
    protected void onPause() {
        super.onPause();

        if (mReactInstanceManager != null) {
            mReactInstanceManager.onHostPause(this);
        }
    }

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

        if (mReactInstanceManager != null) {
            mReactInstanceManager.onHostResume(this, this);
        }
        if (mPermissionsCallback != null) {
            mPermissionsCallback.invoke();
            mPermissionsCallback = null;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (mReactInstanceManager != null) {
            mReactInstanceManager.onHostDestroy();
        }
    }


    @Override
    public void invokeDefaultOnBackPressed() {
        super.onBackPressed();
    }

    public void onBackPressed() {
        if (mReactInstanceManager != null) {
            mReactInstanceManager.onBackPressed();
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public int checkPermission(String permission, int pid, int uid) {
        return super.checkPermission(permission, pid, uid);
    }

    @Override
    public int checkSelfPermission(String permission) {
        return super.checkSelfPermission(permission);
    }

    @Override
    public boolean shouldShowRequestPermissionRationale(@android.support.annotation.NonNull String permission) {
        return super.shouldShowRequestPermissionRationale(permission);
    }

    @Override
    @TargetApi(Build.VERSION_CODES.M)
    public void requestPermissions(String[] permissions, int requestCode, PermissionListener listener) {
        mPermissionListener = listener;
        requestPermissions(permissions, requestCode);
    }
    @Override
    public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
        mPermissionsCallback = new Callback() {
            @Override
            public void invoke(Object... args) {
                if (mPermissionListener != null && mPermissionListener.onRequestPermissionsResult(requestCode, permissions, grantResults)) {
                    mPermissionListener = null;
                }
            }
        };
    }
}

这样就可以正常使用了~