经过一番研究后,我想出了这个：
public class UseGps extends Activity
{
Button gps_button;
TextView gps_text;
LocationManager mlocManager;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
gps_button = (Button) findViewById(R.id.GPSButton);
gps_text = (TextView) findViewById(R.id.GPSText);
gps_button.setOnClickListener(new OnClickListener() {
public void onClick(View viewParam) {
gps_text.append("\n\nSearching for current location. Please hold...");
gps_button.setEnabled(false);
mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}
});
}
/* Class My Location Listener */
public class MyLocationListener implements LocationListener
{
@Override
public void onLocationChanged(Location loc)
{
double lon = loc.getLatitude();
double lat = loc.getLongitude();
gps_text.append("\nLongitude: "+lon+" - Latitude: "+lat);
UseGps.this.mlocManager.removeUpdates(this);
gps_button.setEnabled(true);
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
}
这会使用按钮和textview设置活动.在启动位置管理器的按钮上设置监听器.
我已经设置了一个实现LocationListener的类MyLocationListener,然后我重写了onLocationChanged()方法,基本上告诉它它获取的第一个位置附加到textview然后它删除了位置管理器.
感谢那些帮助过的人,我希望这对其他人有用.

展开全部
记得我前几天发过一个类似的代码如下(适用安卓)32313133353236313431303231363533e78988e69d8331333337383836import android.app.Activity;
import android.os.Bundle;
import android.location.*;
import android.content.*;
import android.util.Log;
import android.widget.TextView;
public class GPSLocationListenActivity extends Activity implements LocationListener {
LocationManager locman;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
locman = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
}
@Override
protected void onResume(){
if (locman != null){
locman.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0,this);
}
super.onResume();
}
@Override
protected void onPause(){
if (locman != null){
locman.removeUpdates(this);
}
super.onPause();
}
@Override
public void onLocationChanged(Location location){
TextView textView1 = (TextView)findViewById(R.id.textView1);
textView1.setText("Latitude:Longitude - "
+String.valueOf(location.getLatitude()) +":"+String.valueOf(location.getLongitude()));
TextView textView2 = (TextView)findViewById(R.id.textView2);
textView2.setText(String.valueOf(location.getTime()));
Log.v("----------", "----------");
Log.v("Latitude", String.valueOf(location.getLatitude()));
Log.v("Longitude", String.valueOf(location.getLongitude()));
Log.v("Accuracy", String.valueOf(location.getAccuracy()));
Log.v("Altitude", String.valueOf(location.getAltitude()));
Log.v("Time", String.valueOf(location.getTime()));
Log.v("Speed", String.valueOf(location.getSpeed()));
Log.v("Bearing", String.valueOf(location.getBearing()));
}
@Override
public void onProviderDisabled(String provider){
}
@Override
public void onProviderEnabled(String provider){
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras){
switch(status){
case LocationProvider.AVAILABLE:
Log.v("Status","AVAILABLE");
break;
case LocationProvider.OUT_OF_SERVICE:
Log.v("Status","OUT_OF_SERVICE");
break;
case  LocationProvider.TEMPORARILY_UNAVAILABLE:
Log.v("Status","TEMPORARILY_UNAVAILABLE");
break;
}
}
}
之前的提问链接

我如何才能获取当前真正运行的app程序名？
环境:sdk版本23,android studio3.1 oppoA59s
2.Service代码
//获取现在启动的Activity
final ActivityManager am = (ActivityManager) getApplicationContext().getSystemService(Activity.ACTIVITY_SERVICE);
new Thread(){
public void run() {
while(true){
try {
List< ActivityManager.RunningTaskInfo > runningTaskInfo = am.getRunningTasks(1);
ComponentName componentInfo = runningTaskInfo.get(0).topActivity;
Log.i(TAG, componentInfo.getPackageName());
sleep(200);
} catch (Exception e) {
e.printStackTrace();
}
}
};
}.start();
manifest.xml代码
但是我打开其他app后获取的当前app名好像被android系统隐藏了。都是显示的com.oppo.launcher。

Android开发中需要用到当前 activity实例，如何获取当前正在显示的Activity实例
1.保存当前Activity实例
import android.app.Activity;
import java.lang.ref.WeakReference;

public class MyActivityManager {
    private static MyActivityManager sInstance = new MyActivityManager();
    private WeakReference<Activity> sCurrentActivityWeakRef;
    private MyActivityManager() {
    }

    public static MyActivityManager getInstance() {
        return sInstance;
    }

    public Activity getCurrentActivity() {
        Activity currentActivity = null;
        if (sCurrentActivityWeakRef != null && sCurrentActivityWeakRef.get() != null) {
            currentActivity = sCurrentActivityWeakRef.get();
        }
        return currentActivity;
    }

    public void setCurrentActivity(Activity activity) {
        sCurrentActivityWeakRef = new WeakReference<Activity>(activity);
    }
}


2.监听Activity的生命周期
在Application的onCreate方法中监听Activity的生命周期
private void initLifeCycle() {
        registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
                MyActivityManager.getInstance().setCurrentActivity(activity);
            }

            @Override
            public void onActivityStarted(Activity activity) {
            }

            @Override
            public void onActivityResumed(Activity activity) {
                MyActivityManager.getInstance().setCurrentActivity(activity);
            }

            @Override
            public void onActivityPaused(Activity activity) {
            }

            @Override
            public void onActivityStopped(Activity activity) {
            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
            }

            @Override
            public void onActivityDestroyed(Activity activity) {
            }
        });
    }

3.使用
activity = MyActivityManager.getInstance().getCurrentActivity();

注意：很多人在onResume方法中对当前实例对象进行赋值，原理上是对的，其实有隐患，储存当前activity的单例类，可能在任意一个地方被调用，比如在某个activity的oncreate方法里执行，这时候会发生取错，进而发生很多不知名bug，正确做法，应该是oncreate和onResume方法里都对单例类进行赋值，保证随时取到的都是最新的正确值。