android - 位置管理器 : java. lang.NoSuchMethodError

Question

我是这个社区的新人，但我已经习惯了从你那里学到很多东西!实际上我开始在 Android Studio 上编程，但现在我卡在了某个地方。我相信这很简单，您很快就会发现。

在 Emulator Nexus 5 API 23(已安装在 Android Studio 中的那个)中，它正在运行，但在我的移动 Android 5.1.1 API 22 上它无法启动。

错误:09-20 19:15:11.526 17776-17776/com.example.stefano.aiutomamma01 E/AndroidRuntime:致命异常:main
进程:com.example.stefano.aiutomamma01，PID:17776
java.lang.NoSuchMethodError: 没有虚拟方法 checkSelfPermission(Ljava/lang/String;)I in class Lcom/example/stefano/aiutomamma01/MainActivity;或其父类(super class)('com.example.stefano.aiutomamma01.MainActivity' 的声明出现在/data/app/com.example.stefano.aiutomamma01-2/base.apk 中)
在 com.example.stefano.aiutomamma01.MainActivity.onCreate(MainActivity.java:28)
在 android.app.Activity.performCreate(Activity.java:5990)
在 android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
在 android.app.ActivityThread.access$800(ActivityThread.java:156)
在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
在 android.os.Handler.dispatchMessage(Handler.java:102)
在 android.os.Looper.loop(Looper.java:211)
在 android.app.ActivityThread.main(ActivityThread.java:5373)
在 java.lang.reflect.Method.invoke( native 方法)
在 java.lang.reflect.Method.invoke(Method.java:372)
在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)


Java代码:

package com.example.stefano.aiutomamma01;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements LocationListener {

    //GPS
    private LocationManager locationManager;

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

        //GPS
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        //CATCHED
        if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    public void requestPermissions(@NonNull String[] permissions, int requestCode)
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for Activity#requestPermissions for more details.
            return;
        }
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    //GPS
    @Override
    public void onLocationChanged(Location location) {

        String str = "Latitude: " + location.getLatitude() + "Longitude: " + location.getLongitude();

        Toast.makeText(getBaseContext(), str, Toast.LENGTH_LONG).show();

    }

    //GPS
    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    //GPS
    @Override
    public void onProviderEnabled(String provider) {

    }

    //GPS
    @Override
    public void onProviderDisabled(String provider) {

    }

}

抱歉发错帖子。顺便说一句:我无法在网上找到解决方案...

问候

Answer 1

运行时权限在 API 23 中引入，与用于处理权限的方法相同。使用 ActivityCompat类方法以向后兼容的方式处理这个问题。

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
    && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    ...
}

等等。