android GoogleMap定位（四）

根据输入的名称查询
 
注：地点输入错误的时候会导致程序崩溃，暂没做处理。(可进行提示的)
 
主界面：
Java代码 
package com.hc; 
 
import java.util.List; 
 
import com.google.android.maps.GeoPoint; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapController; 
import com.google.android.maps.MapView; 
import com.google.android.maps.Overlay; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.RadioGroup; 
import android.widget.RadioGroup.OnCheckedChangeListener; 
import android.widget.Toast; 
 
public class AddressActivity extends MapActivity { 
    /** Called when the activity is first created. */ 
    Button locBn; 
    MapView mv; 
    EditText address_value; 
    MapController controller; 
    Bitmap posBitmap; 
 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.address); 
        posBitmap = BitmapFactory.decodeResource(getResources(), 
                R.drawable.icon); 
        mv = (MapView) findViewById(R.id.mv); 
        address_value = (EditText) findViewById(R.id.address_value); 
        // 显示放大缩小控制按钮 
        mv.setBuiltInZoomControls(true); 
        controller = mv.getController(); 
        locBn = (Button) findViewById(R.id.location); 
        locBn.setOnClickListener(new OnClickListener() { 
 
            @Override 
            public void onClick(View v) { 
 
                String address = address_value.getEditableText().toString().trim(); 
                if (address.equals("")) {