Android权限ACCESS_FINE_LOCATION始终被拒绝 _Android权限

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我尝试检查按钮点击的权限，它总是给我-1
这是我的androidManifest文件：

< ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.natalia.assignment_2"> < uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> < uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> < application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> < activity android:name=".MainActivity"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name="android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < /application> < /manifest>

我也有compileSdkVersion 28，minSdkVersion 22和targetSdkVersion 28。
在我的MainActivity中，我尝试检查权限并始终拒绝，因为它返回-1

public class MainActivity extends AppCompatActivity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button buttonLocate = (Button) findViewById(R.id.buttonLocate); buttonLocate.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { askForPermission("android.permission.ACCESS_FINE_LOCATION"); }); }private void askForPermission(String permission) {if(MainActivity.this != null) { if (PermissionChecker.checkSelfPermission(MainActivity.this, permission) != PackageManager.PERMISSION_GRANTED) {// IT ALWAYS COMES TO THIS IF AND SHOWS -1 Toast.makeText(this, "" + String.valueOf(PermissionChecker.checkSelfPermission(MainActivity.this, permission)), Toast.LENGTH_SHORT).show(); } else { Toast.makeText(this, "" + permission + " is already granted.", Toast.LENGTH_SHORT).show(); } } }

}
我尝试了很多个小时，但没有任何帮助......这里有什么问题？
答案