Android于fragment_main.xml文件问题组件收购

package com.dhy.phonedial;

import android.app.Activity;
import android.app.Fragment;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

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

if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}

}

@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);
}

/**
* A placeholder fragment containing a simple view. 一个占位符片段包括一个简单的视图。
*/
/**
* 这个内部类是最新的开发工具所自己主动完毕的,其功能就是对fragment_main.xml文件进行载入并解析,能够获取fragment_main.
* xml中的已注冊组件.
*
* @author Martin
*
*/
public static class PlaceholderFragment extends Fragment {

public PlaceholderFragment() {

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// 获取视图对象依据fragment_main.xml文件
final View rootView = inflater.inflate(R.layout.fragment_main,
container, false);

// 通过视图对象获取组件
Button dialBtn = (Button) rootView.findViewById(R.id.btn_dial);
System.out.println(rootView.findViewById(R.id.btn_dial)
+ "============" + R.id.btn_dial + "==================="
+ dialBtn);

// 为组件加入事件
// 因为我也是新手还没有解决不使用匿名内部类怎样获取组件的问题,
dialBtn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// 相同通过视图对象获取组件
EditText et_number = (EditText) rootView
.findViewById(R.id.edit_number);
String number = et_number.getText().toString();
System.out.println("================" + number);

Intent intent = new Intent();
intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + number));
startActivity(intent);
}

});

return rootView;
}

}

}