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我在書上曾看過說一個 .java檔,裡面的 class只有一個能是 public 的,可我在 Android ADT看到
src 底下的 MainActivity.java看到有兩個class 為 public,以下為程式碼,這怎回事?謝謝。
- package com.example.ch4_7_2;
- import android.support.v7.app.ActionBarActivity;
- import android.support.v7.app.ActionBar;
- import android.support.v4.app.Fragment;
- import android.os.Bundle;
- import android.view.LayoutInflater;
- import android.view.Menu;
- import android.view.MenuItem;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.TextView;
- import android.os.Build;
- public class MainActivity extends ActionBarActivity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- if (savedInstanceState == null) {
- getSupportFragmentManager().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.
- */
- public static class PlaceholderFragment extends Fragment {
- public PlaceholderFragment() {
- }
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container,
- Bundle savedInstanceState) {
- View rootView = inflater.inflate(R.layout.fragment_main, container, false);
- return rootView;
- }
- }
- }
複製代碼
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