android – 片段和活动 – 我在哪里放置我的应用程序逻辑？

package com.PHPpointofSALE.PHPpointofSALE;

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 StoreUrlActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceStatE) {
        super.onCreate(savedInstanceStatE);
        setContentView(R.layout.activity_store_url);

        if (savedInstanceState == null) {
            getSupportFragmentManager().begintransaction()
                    .add(R.id.container,new StoreUrlFragement()).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.store_url,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 StoreUrlFragement extends Fragment {

        public StoreUrlFragement() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceStatE) {
            View rootView = inflater.inflate(R.layout.fragment_store_url,container,falsE);
            return rootView;
        }
    }

}

首先,我建议阅读这个 Fragments.特别注意创建的片段部分,其中包括片段生命周期图.第二次下载并编译这个 Sample App,有效的导航应用程序将帮助您了解不同的片段如何协同工作,甚至实现一个操作栏.

为了回答你的问题或多或少,一个片段可以被认为是一个单独的类.一旦调用该特定片段,就可以从该类中调用函数.

Fragment Case-Switch

这是一些示例代码,向您展示我的意思.

public Fragment getItem(int i){
    switch (i) {
        case 0:
            // The first section of the app is the most interesTing -- it offers
            // a launchpad into the other demonstrations in this example application.
            return new LaunchpadSectionFragment();

        case 1:
            return new BluetoothClass();

        default:
            // The GPS section of the app .
            Fragment fragment = new DummySectionFragment();
            Bundle args = new Bundle();
            args.puTint(DummySectionFragment.ARG_SECTION_numbER,i + 1);
            fragment.setArguments(args);
            return fragment;
        }
}

在这种情况下,我的每个片段都代表一个类,它在一个单独的选项卡中实现,每个选项卡都有一个单独的@L_696_21@.片段的一个主要优点是,您可以在不先让一个活动完成的情况下运行单独的活动.

此外,每个片段都是java.lang.object库的扩展.所以它具有所有这些@L_696_21@.我也会阅读this.最后,为每个片段分别创建单独的xml文件是个好主意,然后在调用片段时可以单独显示它.

一些更多的代码

每个片段将/可能有这个

public void onActivityCreated(Bundle savedInstanceStatE){
        super.onActivityCreated(savedInstanceStatE);
            // Do stuff on creation. This is usually where you add the bulk of your code. Like clickListners

        View rootview = inflater.inflate(R.layout.xml_the_fragment_uses container,falsE);
        rootview.findViewById(R.id.your_id).setOnClickListener(new View.onClickListener() {
        @Override
        public void onClick(View v) {
            //Do something 
        }
    });
}


    public void onStart(){
        super.onStart();
        Toast.makeText(getActivity(),"Fragment started",Toast.LENGTH_SHORT).show();
    }       

    public void onResume(){
        super.onStart();
        Toast.makeText(getActivity(),"Fragment Resumed",Toast.LENGTH_SHORT).show();

    }

    public void onStop(){
        super.onStart();
        Toast.makeText(getActivity(),"Fragment Stoped",Toast.LENGTH_SHORT).show();
        disableBT();
    }

请记住,这些函数来自我前面提到的片段生命周期.

希望这能让你对片段有所了解.还记得阅读this,因为许多@L_696_21@使用v7 app compat库.包括fragment manager.