动态权限申请封装在BaseActivity中

public class BaseActivity extends AppCompatActivity {

private int mRequestCode = 12;
private String mReason;
private String mPermission;

// 申请权限
protected void requestPermission(String permission, String reason) {
mReason = reason;
mPermission = permission;
// 判断自身是否拥有此权限
if (PackageManager.PERMISSION_DENIED == checkSelfPermission(permission)) {
// 如果没有，就去申请权限
requestPermissions(new String[]{permission}, mRequestCode);
} else {
// 如果有，则返回给子类调用
onPermissionResult(true);
}
}

// 系统activity回调的权限申请结果
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == mRequestCode && grantResults[0] != PackageManager.PERMISSION_DENIED) {
// 权限申请成功
onPermissionResult(true);
} else {
// 权限申请失败，判断是否需要弹窗解释原因
if (shouldShowRequestPermissionRationale(permissions[0])) {
// 如果需要弹窗，则弹窗解释原因
showReasonDialog();
} else {
// 否则，告诉子类权限申请失败
onPermissionResult(false);
}
}
}

// 展示给用户说明权限申请原因
private fun showReasonDialog() {
AlertDialog.Builder(this)
.setMessage(mReason)
.setNegativeButton("取消", {dialog, which ->
dialog.dismiss()
onPermissionResult(false)
}).setPositiveButton("确定", {dialog, which ->
dialog.dismiss()
requestPermissions(arrayOf < String > (mPermission), mRequestCode)
}).create().show()
}

// 需要子类实现的权限申请结果，不写成接口是因为并不是所有的activity都需要申请权限
protected void onPermissionResult(boolean result) {

}
}