封装actionbar

来源：互联网发布：数据库电子书下载编辑：程序博客网时间：2024/06/08 16:00

在新建一个工程的时候，常常需要统一样式的actionbar,如果每个activity都要去重新的化显得非常麻烦，下面提供了便捷的封装方法，只要让activity继承baseactivity,在重写 initialActionBar(int leftId,String title,int rightId)方法，就可以直接操作actionbar上的控件，如imageview_left直接设置监听，不需要初始化，（在父类中已经实现，省去了麻烦）；

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="60dp"    android:background="#303E3E"    android:orientation="horizontal" >    <ImageView        android:id="@+id/imageView_left"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_vertical"        android:src="@drawable/ic_launcher" />    <TextView        android:id="@+id/textView_title"        android:layout_width="0dp"        android:layout_height="match_parent"        android:layout_weight="1"        android:gravity="center"        android:text="TextView"        android:textColor="#DEE1E1"        android:textSize="20sp" />    <ImageView        android:id="@+id/imageView_right"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/ic_launcher"        android:layout_gravity="center_vertical"         /></LinearLayout>

import android.os.Bundle;import android.app.Activity;import android.text.TextUtils;import android.view.Menu;import android.view.View;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;public class BaseActivity extends Activity {    protected ImageView imageview_left;    protected ImageView imageview_right;    protected TextView textview_title=null;    protected LinearLayout actionbar=null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }    public void initialActionBar(int leftId,String title,int rightId){        if(actionbar==null){//子类中必须实现actionbar，否则不能初始化以下            return;        }        imageview_left=(ImageView) findViewById(R.id.imageView_left);        imageview_right=(ImageView) findViewById(R.id.imageView_right);        textview_title=(TextView) findViewById(R.id.textView_title);        if(leftId==-1){            imageview_left.setVisibility(View.INVISIBLE);        }else{            imageview_left.setVisibility(View.VISIBLE);            imageview_left.setImageResource(leftId);        }        if(TextUtils.isEmpty(title)){            textview_title.setVisibility(View.INVISIBLE);        }else{            textview_title.setVisibility(View.VISIBLE);            textview_title.setText(title);        }        if(rightId==-1){            imageview_right.setVisibility(View.INVISIBLE);        }else{            imageview_right.setVisibility(View.VISIBLE);            imageview_right.setImageResource(rightId);        }    }}

例子：

public class MainActivity extends BaseActivity implements LoadMusicsListener{    HttpMusicManager manager=null;    ProgressDialog dialog=null;//定义一个进度条对话框    ListView listView_musics;    MusicAdapter adapter=null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initialUI();    }    private void initialUI() {        dialog=ProgressDialog.show(this, "数据加载", "音乐数据加载中,请耐心等待......");        listView_musics=(ListView) findViewById(R.id.listview_musics);        //初始化标题控件        actionbar=(LinearLayout) findViewById(R.id.actionbar_main);        initialActionBar(-1, "音乐列表", -1);        //实例化一个数据适配器        adapter=new MusicAdapter(this);        //设置适配器        listView_musics.setAdapter(adapter);    }}

xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <include        android:id="@+id/actionbar_main"        android:layout_width="match_parent"        android:layout_height="wrap_content"        layout="@layout/include_actionbar" />    <ListView        android:id="@+id/listview_musics"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_below="@id/actionbar_main"        android:background="@color/silver"        android:cacheColorHint="#00000000"        android:dividerHeight="2dp"        android:listSelector="#00000000" >    </ListView></RelativeLayout>

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