Intent 调用系统程序

package com.example.demo1;

import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity
{
    private Button btn;
    private Intent intent;

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

        btn = (Button) findViewById(R.id.btn);
        btn.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {

                Uri location = Uri.parse("geo:37.422219,-122.08364?z=14");
                //                Uri webpage=Uri.parse("http://www.baidu.com");
                //                Uri number=Uri.parse("tel:13211111111");
                intent = new Intent(Intent.ACTION_VIEW, location);

                // 确定intent可以被处理
                PackageManager manager = getPackageManager();
                List<ResolveInfo> activities = manager.queryIntentActivities(
                        intent, 0);
                Log.i("info", activities.size() + "");
                for (int i = 0; i < activities.size(); i++)
                {
                    Log.i("info",
                            activities.get(i).activityInfo.applicationInfo
                                    .loadLabel(manager).toString() + "");
                }

                //选择器，强制用户每次使用都做出选择
                String title = "choose";
                // 创建并打开一个选择器
                Intent chooser = Intent.createChooser(intent, title);

                startActivity(chooser);
            }
        });
    }

}