findViewById的问题

[u012914916]

请问，这个，直接用findViewById正常显示列表，用p1.findViewById就不显示了，都不是null值，为什么呢？？哪位大兄弟给我说一说啊，谢谢。
res/layout/里有p1.xml。

public class MainActivity extends ActionBarActivity {
private View mPopMenuView;
private PopupWindow mPopWindow;

private LinearLayout p1;
private LinearLayout p2;
private LinearLayout p3;
private ListView p1List; //屏1的列表

@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	//setContentView(R.layout.activity_main);
	setContentView(R.layout.p1);
	//getSupportActionBar().setDisplayHomeAsUpEnabled(true); //显示导航的返回按钮

	//屏1的列表
	try {
		p1 = (LinearLayout) LayoutInflater.from(MainActivity.this).inflate(R.layout.p1, null);
		if(p1 == null){
			Log.e("自定义错误","p1为null");
		}else{
			Log.e("自定义错误","p1不为null");
		}
		p1List = (ListView) p1.findViewById(R.id.p1_list);
		if(p1List == null){
			Log.e("自定义错误","p1List为null");
		}else{
			Log.e("自定义错误","p1List不为null");
		}

		BaseAdapter adapter = new BaseAdapter() {
			Integer image[] = new Integer[]{R.drawable.dingding, R.drawable.dixi, R.drawable.lala, R.drawable.bo};
			String username[] = new String[]{"张三", "李四", "王五", "赵六"};
			String message[] = new String[]{"湖南 男 13", "北京 男 14", "广东 男 15", "厦门 男 16"};

			@Override
			public View getView(int position, View convertView, ViewGroup parent) {
				LinearLayout p1ListLayout = null; //屏1列表项布局xml
				if (convertView == null) {
					p1ListLayout = (LinearLayout) LayoutInflater.from(MainActivity.this).inflate(R.layout.p1_list, null);
				} else {
					p1ListLayout = (LinearLayout) convertView;
				}

				ImageView img = (ImageView) p1ListLayout.findViewById(R.id.header_img);
				TextView text1 = (TextView) p1ListLayout.findViewById(R.id.username);
				TextView text2 = (TextView) p1ListLayout.findViewById(R.id.message);
				if(text1 == null){
					Log.e("自定义错误","text2为null");
				}else{
					Log.e("自定义错误","text2不为null");
				}

				img.setImageResource(image[position]);
				text1.setText(username[position]);
				text2.setText(message[position]);

				return p1ListLayout;
			}

			@Override
			public int getCount() {
				return username.length;
			}

			@Override
			public String getItem(int position) {
				return username[position];
			}

			@Override
			public long getItemId(int position) {
				return position;
			}
		};
		p1List.setAdapter(adapter);
	}catch (Exception e){
		Log.e("p1List",Log.getStackTraceString(e));
	}
}

[u012914916]

25行那里。 正常：p1List = (ListView) findViewById(R.id.p1_list); 不显示：p1 = (LinearLayout) LayoutInflater.from(MainActivity.this).inflate(R.layout.p1, null); p1List = (ListView) p1.findViewById(R.id.p1_list);

[林深]

p1 = (LinearLayout) LayoutInflater.from(MainActivity.this).inflate(R.layout.p1, null); 这步操作是新建了一个由R.layout.p1这个layout表现的view，注意是新建，并不是使用当前activity所在的contentview，，所以嘛，你从p1里面取到的p1List不是当前界面上的p1List。。。这完全是两个对象。。。