Android 使用Gallery组件实现图片播放预览

Posted 2020-10-01 星辰

Gallery(画廊)扩展了LayoutParams，以此提供可以容纳当前的转换信息和先前的位置转换信息的场所。

Activity

package com.app.test01;





import com.app.adapter.ImageAdapter;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Gallery;
import android.widget.ImageView;

public class GalleryTest extends Activity{
    Gallery gallery;
    ImageView imagedemo;
    ImageAdapter iAdapter = new ImageAdapter(this);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gallery);
        
        gallery = (Gallery) findViewById(R.id.gallery1);
        imagedemo = (ImageView) findViewById(R.id.imagedemo);
        
        gallery.setAdapter(iAdapter);
        gallery.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO Auto-generated method stub
                Integer[] iViews = iAdapter.getmImageIds();
                imagedemo.setImageDrawable(getResources().getDrawable(iViews[position]));
            }
        });
    }
}

BaseAdapter适配器

package com.app.adapter;

import com.app.test01.R;

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


public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    public ImageAdapter(Context c) {
        mContext = c;
    }

    public int getCount() {
        return mImageIds.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView i = new ImageView(mContext);
        i.setImageResource(mImageIds[position]);
        i.setLayoutParams(new Gallery.LayoutParams(150,75));
        return i;
    }

    public Integer[] getmImageIds() {
        return mImageIds;
    }

    public void setmImageIds(Integer[] mImageIds) {
        this.mImageIds = mImageIds;
    }

    private Integer[] mImageIds = {
            R.drawable.image01,
            R.drawable.image02,
            R.drawable.image03,
            R.drawable.image04,
            R.drawable.image05,
            R.drawable.image06,
            R.drawable.image07,
            R.drawable.image08,
            R.drawable.image09,
            R.drawable.image01,
            R.drawable.image02,
            R.drawable.image03,
            R.drawable.image04,
            R.drawable.image05,
            R.drawable.image06,
            R.drawable.image07,
            R.drawable.image08,
            R.drawable.image09,
    };
}

XML布局文件

<?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="match_parent"
    android:orientation="vertical" >

    <Gallery
        android:id="@+id/gallery1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center">
        
        <ImageView
            android:id="@+id/imagedemo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/image01" />
    </RelativeLayout>

</LinearLayout>