Gallery和ImageSwitcher

Gallery

1. 設定資料來源，Gallery 佈局；
2. 例項化 gallery；
3. 自定義 ImageAdapter 圖片介面卡，並完成介面卡的成員方法；
4. 例項化 ImageAdapter 圖片介面卡；
5. gallery載入介面卡。

MainActivity.java

package com.example.administrator.stu_garry_imageswitcher;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget
 
.Gallery;

public class MainActivity extends AppCompatActivity {

    private int [] res = {R.drawable.item1,R.drawable.item2,R.drawable.item3,
            R.drawable.item4,R.drawable.item5,R.drawable.item6,R.drawable.item7,
            R.drawable.item8,R.drawable.item9,R.drawable.item10,R.drawable.item
 
11,
            R.drawable.item12};                                                       //設定資料來源
    private ImageAdapater adapater;
    private Gallery gallery;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout
 
.activity_main);

        gallery = (Gallery) findViewById(R.id.gallery);           //例項化gallery
        adapater = new ImageAdapater(res,this);

        gallery.setAdapter(adapater);                //載入介面卡
    }
}

Imagedapter.java

package com.example.administrator.stu_garry_imageswitcher;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class ImageAdapater extends BaseAdapter{

    private int []res;
    private Context context;

    ImageAdapater(int[] res, Context context){      //通過建構函式傳遞對應的資料
        this.res = res;
        this.context = context;
    }
    //返回資料來源檔案中的內容數目
    @Override
    public int getCount() {  //控制可同一方向滑動的最大值
        return res.length;  //返回資料來源陣列的大小
        //return Integer.MAX_VALUE;  //設定資料來源大小為整形最大值
    }
    //獲取圖片內容
    @Override
    public Object getItem(int position) {
        return res[position];  //返回當前圖片內容
    }
    //獲取圖片ID
    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView = new ImageView(context);
        imageView.setBackgroundResource(res[position%res.length]);     //設定縮圖片
        imageView.setLayoutParams(new Gallery.LayoutParams(400,300));  //設定縮圖的寬、高
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);     //設定縮放模式
        return imageView;
    }
}

ImagerSwitcher

MainActivity.java

...implements AdapterView.OnItemSelectedListener,ViewSwitcher.ViewFactory{  //ImageSwitch 使用ViewFactory 顯示圖片
    ...
    private ImageSwitcher imageSwitcher;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        gallery = (Gallery) findViewById(R.id.gallery);
        adapater = new ImageAdapater(res,this);
        imageSwitcher = (ImageSwitcher) findViewById(R.id.switcher);

        gallery.setAdapter(adapater);
        gallery.setOnItemSelectedListener(this);

        imageSwitcher.setFactory(this);
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        imageSwitcher.setBackgroundResource(res[position]);
        //設定進入動畫效果--淡入
        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in)); 
         //設定進入動畫效果--淡出
        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }

    @Override
    public View makeView() { //設定 ViewFactory
        ImageView imageView = new ImageView(this);
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
        return imageView;
    }
}