关于Android百度定位API定位城市问题

我百度定位城市一直定位不了，参考了源代码，看了网上不少例子，就是返回不了城市，我也不知为什么，求各位大神帮我看看、

Manifest.xml
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
             android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
                     android:name="com.baidu.location.f"
            android:enabled="true"
            android:process=":remote" >
            
                
                
            
        
        
                     android:name="com.baidu.lbsapi.API_KEY"
            android:value="N8j8HzuRI7XVBsjl6VDoIQYG" />
                     android:name=".MainActivity"
            android:label="@string/app_name" >
            
                

                
            
        
    
Activity.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.baidu.location.BDLocation;
import com.baidu.location.BDLocationListener;
import com.baidu.location.LocationClient;
import com.baidu.location.LocationClientOption;

public class MainActivity extends AppCompatActivity {

    public Button button;
    public TextView text;
    private String tempcoor="gcj02";
    public LocationClient mLocationClient;
    public MyLocationListener mMyLocationListener;

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

        button = (Button)findViewById(R.id.button);
        text = (TextView)findViewById(R.id.text);
        
        mLocationClient = new LocationClient(this.getApplicationContext());
        mMyLocationListener = new MyLocationListener();
        mLocationClient.registerLocationListener(mMyLocationListener);
        initLocation();
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                mLocationClient.start();//定位SDK start之后会默认发起一次定位请求，开发者无须判断isstart并主动调用request

            }
        });
    }
    public class MyLocationListener implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            //Receive Location
            text.setText(location.getCity());
            Toast.makeText(MainActivity.this, "城市:" + text.getText(), 0).show();
            mLocationClient.stop();
        }
    }
    private void initLocation(){
        LocationClientOption option = new LocationClientOption();
        option.setOpenGps(true);
        option.setScanSpan(2000);
        option.setAddrType("all");
        option.setCoorType("gcj02");
        mLocationClient.setLocOption(option);
    }

}


本人很菜，问题请说详细点，刚接触不久