使用指定的Action，Category调用系统Activity

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Android提供了大量的标准Action，Category：

例子，查看并获取联系人电话

用户点击按钮值会显示系统的联系人列表，当用户单击联系人之后，程序将会显示该联系人的名字和电话

MainActivity.java

package com.hust.getcontacts;import android.app.Activity;import android.content.CursorLoader;import android.content.Intent;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.provider.ContactsContract;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity {    final int PICK_CONTACT=0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button btn=(Button) findViewById(R.id.button1);                btn.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stub//创建intentIntent intent=new Intent();//设置Intent的Action属性intent.setAction(Intent.ACTION_GET_CONTENT);//设置Intent的Type属性intent.setType("vnd.android.cursor.item/phone");//启动Activity，并希望获取该Activity的结果startActivityForResult(intent,PICK_CONTACT);}                });                   }    //重写该方法，处理返回的联系人数据在参数Intent data中    @Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);switch(requestCode){ case (PICK_CONTACT):  if(resultCode==Activity.RESULT_OK){//Activity.RESULT_OK标准Activity结果 -1  //获取返回的联系人数据  Uri contactdata=data.getData();  CursorLoader cursorloader=new CursorLoader(this, contactdata, null, null, null, null);  //查询联系人信息表  Cursor cursor=cursorloader.loadInBackground();  //如果查询到指定的联系人  if(cursor.moveToFirst()){ //获取联系人的Id  String contactId=cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));  //获取联系人的名字  String name=cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME));      String phoneNumber="此联系人暂未输入电话号码";            //根据联系人查询该联系人的详细信息      Cursor phones=getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID+"="+contactId, null, null);     //      if(phones.moveToFirst()){      //取出电话号码      phoneNumber=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));      }      phones.close();            EditText show=(EditText) findViewById(R.id.editText1);      show.setText(name);      EditText phone=(EditText) findViewById(R.id.editText2);      phone.setText(phoneNumber);        }  cursor.close();  }        break;}}@Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}

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