(001)android_gps设置开启和关闭

package com.alin.test;

import android.app.Activity;
import android.app.PendingIntent;
import android.app.PendingIntent.CanceledException;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class TestAndroidActivity extends Activity
{

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button = (Button) this.findViewById(R.id.btn);
        button.setOnClickListener(new OnClickListener()
        {

            public void onClick(View v)
            {
                f_toggleGpsButton();
                if (f_isGPSEnable())
                {
                    Toast.makeText(TestAndroidActivity.this, "GPS处于开启状态", Toast.LENGTH_LONG).show();
                }
                else
                {
                    Toast.makeText(TestAndroidActivity.this, "GPS处于关闭状态", Toast.LENGTH_LONG).show();
                }
            }
        });
    }
    public void f_toggleGpsButton()
    {
        Intent gpsIntent = new Intent();
        gpsIntent.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider");
        gpsIntent.addCategory("android.intent.category.ALTERNATIVE");
        gpsIntent.setData(Uri.parse("custom:3"));
        try
        {
            PendingIntent.getBroadcast(this, 0, gpsIntent, 0).send();
        }
        catch (CanceledException e)
        {
            e.printStackTrace();
        }
    }
    private boolean f_isGPSEnable()
    {
        String mGpsState = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
        Log.v("GPS", mGpsState);
        if(mGpsState.contains("gps"))
        {
            return true;
        }
        else 
        {
            return false;
        }
    }
}