TextFields 不更新

Question

android 开发新手，一直在尝试按照 android studio 中的 gps 定位应用程序教程进行操作，但由于某种原因，文本字段没有更新。

这是我一直关注的教程：- [Android Studio Tutorial - Build a GPS App]1

................................................ ..................................................... ..................................................... ..................................................... ..................................................... ..................... 这是代码：-

public class MainActivity extends AppCompatActivity {

TextView longi,lat;
Switch share;

// google play service api
FusedLocationProviderClient fusedLocationProviderClient;
// location request service
LocationRequest locationRequest;
private static final int sETINTERVAL=30;
private static final int fASTESTINTERVAL=5;
public static final int rEQUESTCODE=1;

@RequiresApi(api = Build.VERSION_CODES.M)
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    longi = findViewById(R.id.longi);
    lat   = findViewById(R.id.lat);
    share = findViewById(R.id.share);

    locationRequest = LocationRequest.create();

    locationRequest.setInterval(1000 * sETINTERVAL);
    locationRequest.setFastestInterval(1000 * fASTESTINTERVAL);
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    share.setOnClickListener(v -> {
        if(share.isChecked()){
            share.setText("ON");
            updateGPS();
        }
        else{
            share.setText("OFF");
        }
    });
}

@RequiresApi(api = Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode){
        case rEQUESTCODE:
            if(grantResults[0] == PackageManager.PERMISSION_GRANTED){
                updateGPS();
            }
            else{
                Toast.makeText(this, "Requires location permission", Toast.LENGTH_SHORT).show();
                finish();
            }
            break;
        default:
            throw new IllegalStateException("Unexpected value: " + requestCode);
    };
}


@RequiresApi(api = Build.VERSION_CODES.M)
private void updateGPS(){
    fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(MainActivity.this);

    if(ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
        fusedLocationProviderClient.getLastLocation().addOnSuccessListener(this, new OnSuccessListener<Location>() {
            @Override
            public void onSuccess(Location location) {
                updateUI(location);
            }
        });
    }
    else{
        requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION},rEQUESTCODE);
    }
}

private void updateUI(Location location){
    lat.setText(String.valueOf(location.getLatitude()));
    longi.setText(String.valueOf(location.getLongitude()));
}

}

Answer 1

尝试使用此代码：

@RequiresApi(api = Build.VERSION_CODES.M)
            private void updateGPS() {
                fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(MainActivity.this);

                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                    fusedLocationProviderClient.getLastLocation().addOnSuccessListener(this, new OnSuccessListener<Location>() {
                        @Override
                        public void onSuccess(Location location) {
                            updateUI(location);
                        }
                    });
                } else {
                    requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, rEQUESTCODE);
                }
            }

在onCreate代码中写入

fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);

gradle:

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'

dependencies {

    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'



    implementation 'com.google.android.gms:play-services-location:19.0.1'

}

TextFields 不更新

TextFields not updating

java

android

runtime-error

android-studio