自定義在兩種屏幕尺寸中使用spinner

 

 spinner就是能夠點擊的TextView,徹底能夠使用TextView,使用適當的背景,作出下拉框,其實更方便,若是使用spinner這個組件,能夠分別定義,寫了個Demo,spinner很差看,能夠換背景圖片,代碼以下: android

  1.首先AndroidManifest.xml app

  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testspinnertext"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" /> ide

   <supports-screens 
        android:largeScreens="true"
        android:normalScreens="true"
        android:anyDensity="true"/> 佈局


    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />


                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest> 字體

2.res目錄下,創建分別創建layout(原來就已經存在的)和layout-large,這個兩個文件夾下的文件實際上是同樣的,只是要改的佈局和尺寸等 this

1).layout中的文件 spa

   activity_main.xml中: orm

<LinearLayout 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" >


    <Spinner 
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:prompt="@string/hello_world"/>
</LinearLayout> xml

   spinner_style.xml中 圖片

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textColor="#0000FF"
    android:padding="10dip"
    android:id="@+id/cit_spinner_item"
    android:textSize="15dp">
    
</TextView>


2).layout-large.xml中的文件

     activity_main.xml中

<LinearLayout 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" >


    <Spinner 
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:prompt="@string/hello_world"/>


</LinearLayout>


     spinner_style.xml中

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textColor="#0000FF"
    android:padding="10dip"
    android:id="@+id/cit_spinner_item"
    android:textSize="25dp">
    


</TextView>

3.src目錄下,要創建2個不一樣的適配器,具體代碼以下:

   1)MJSimpleSpinnerAdapter類中

    package com.example.testspinnertext;

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;


public class MJSimpleSpinnerAdapter extends ArrayAdapter<String>{


Context context;
String[] items = new String[]{};
public MJSimpleSpinnerAdapter(Context context, int textViewResourceId,
String[] objects) {
super(context, textViewResourceId, objects);
// TODO Auto-generated constructor stub
this.context = context;
this.items = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView == null){
LayoutInflater inflater = LayoutInflater.from(context);
convertView = inflater.inflate(android.R.layout.simple_spinner_item, parent,false);
}
TextView text = (TextView)convertView.findViewById(android.R.id.text1);
text.setText(items[position]);
text.setTextColor(Color.BLUE);
   text.setTextSize(10);
return convertView;
}
}

複製到這裏的面板後,格式好難看。

   2).MJLargeSpinnerAdapter類中

package com.example.testspinnertext;


import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;


public class MJLargeSpinnerAdapter extends ArrayAdapter<String>{
/**
* @param args
*/
Context context;
String[] items = new String[]{};


public MJLargeSpinnerAdapter(Context context, int textViewResourceId,
String[] objects) {
super(context, textViewResourceId, objects);
// TODO Auto-generated constructor stub
this.context = context;
this.items = objects;
}


public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView == null){
LayoutInflater inflater = LayoutInflater.from(context);
convertView = inflater.inflate(android.R.layout.simple_spinner_item, parent,false);
}
TextView text = (TextView)convertView.findViewById(android.R.id.text1);
text.setText(items[position]);
text.setTextColor(Color.RED);
   text.setTextSize(25);
return convertView;
}
}


3).MainActivity類中

package com.example.testspinnertext;


import android.os.Bundle;
import android.app.Activity;
import android.util.DisplayMetrics;
import android.util.Log;
import android.widget.Spinner;




public class MainActivity extends Activity {


String[] str = {"選項一","選項二","選項三","選項四"};
Spinner spinner;
private int width = 0;
private int height = 0;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        spinner = (Spinner)findViewById(R.id.spinner);
        
        //根據屏幕的寬和高來決定spinner中顯示的字體的樣式等(不是spinner的下拉框中的字體)
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        
        width = dm.widthPixels;
        height = dm.heightPixels;
        Log.i("寬高", width+","+height);
//        MJSimpleSpinnerAdapter adapter = new MJSimpleSpinnerAdapter(MainActivity.this, 
//         android.R.layout.simple_spinner_item, str);
//        spinner.setAdapter(adapter);
        if(width<=500&&height<=800){
        MJSimpleSpinnerAdapter adapter = new MJSimpleSpinnerAdapter(MainActivity.this, 
            android.R.layout.simple_spinner_item, str);
        adapter.setDropDownViewResource(R.layout.spinner_style);
            spinner.setAdapter(adapter);
        }else {
        MJLargeSpinnerAdapter adapter = new MJLargeSpinnerAdapter(MainActivity.this,
        android.R.layout.simple_spinner_item, str);
        adapter.setDropDownViewResource(R.layout.spinner_style);
        spinner.setAdapter(adapter);
        }
            
    }
      
}

  到這裏,這個Demo就完成了,程序很小,只是個小例子,能夠擴展使用,
相關文章
相關標籤/搜索