Question

我是Android开发的新手，并且被ActionBar和＆＃34; Fragments-Stuff＆＃34;混淆了显然是KitKat附带的。只是一个简单的问题：我曾经在我的MainActivity的onCreate（）中实现我的点击监听器，我现在在哪里放置魔法？

package com.example.alertdialig;

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.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;
    }
}

}

Answer 1

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_main, container, false);
    Button myButton = rootView.findViewById(R.id.myButtton);
    myButton.setOnClickListener(new OnClickListener(){
    ...
  });
  return rootView;
}

Answer 2

您可以在片段中的onCreateView中执行此操作。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
     View rootView = inflater.inflate(R.layout.fragment_main, container, false);
     Button aButton = rootView.findViewById(R.id.aButton);
     aButton.setOnClickListener(new View.OnClickListener(){

         @Override
         public void onClick(View v){
         }
     });
     return rootView;
 }

顺便说一句，片段是在Android 3.0中引入的，而不是KitKat; - ）

使用片段时放置代码的位置？

2 个答案: