android實現界面滑動，Android 上千張圖片的列表滑動加載-小白筆記-匯編語言學習筆記

android實現界面滑動，Android 上千張圖片的列表滑動加載

2023-11-19 阅读 26 评论 0

摘要：一般項目中圖片加載用的比較多的是ImageLoader 但是需求自己配置一些參數上手有些復雜對于手機圖庫中有上千張圖片需要加載時一個使用性能很好的庫Glide可以解決效果圖如下滑動非常流暢加載速度也很快而且使用也非常簡單個人感覺比手機自帶的圖庫效果更佳 android實現

一般項目中圖片加載用的比較多的是ImageLoader 但是需求自己配置一些參數上手有些復雜

對于手機圖庫中有上千張圖片需要加載時一個使用性能很好的庫Glide可以解決效果圖如下

滑動非常流暢加載速度也很快而且使用也非常簡單個人感覺比手機自帶的圖庫效果更佳

android實現界面滑動？上圖上代碼

Code

public class MainActivity extends Activity {ArrayList<String> fileNames = new ArrayList<String>(); //本地圖片路徑
@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initData();GridView listView = (GridView) findViewById(R.id.gridview);//ImageAdapter imageAdapter = new ImageAdapter(getApplicationContext(),Images.imageUrls);ImageAdapter imageAdapter = new ImageAdapter(getApplicationContext(), fileNames);listView.setAdapter(imageAdapter);}private void initData() {fileNames.clear();Cursor cursor = getContentResolver().query(Media.EXTERNAL_CONTENT_URI, null, null, null, null);while (cursor.moveToNext()) {byte[] data = cursor.getBlob(cursor.getColumnIndex(Media.DATA)); //圖片的保存位置的數據fileNames.add(new String(data, 0, data.length - 1));}}}

activity_main

<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="com.example.imagelist.MainActivity" ><GridViewandroid:id="@+id/gridview"android:layout_width="match_parent"android:layout_height="wrap_content"android:numColumns="3" android:horizontalSpacing="2dp"android:verticalSpacing="2dp"></GridView></RelativeLayout>

Android登錄加載用戶頭像。ImageAdapter

public class ImageAdapter extends BaseAdapter {private Context context;private String[] imageUrls;ArrayList<String> fileNames;private LinearLayout.LayoutParams mImageViewLayoutParams;/** public ImageAdapter(Context context, String[] imageUrls) { super();* this.context = context; this.imageUrls = imageUrls; }*/public ImageAdapter(Context context, ArrayList<String> fileNames) {super();this.context = context;this.fileNames = fileNames;DisplayMetrics dm = context.getResources().getDisplayMetrics();  int wh = dm.widthPixels;int w = (wh - context.getResources().getDimensionPixelSize(R.dimen.test) * 2) / 3;mImageViewLayoutParams = new LinearLayout.LayoutParams(w, w);}@Overridepublic int getCount() {return fileNames.size();}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view;if (convertView == null) {view = LayoutInflater.from(context).inflate(R.layout.item, null);} else {view = convertView;}ImageView image = (ImageView) view.findViewById(R.id.image);image.setLayoutParams(mImageViewLayoutParams);Glide.with(context).load(fileNames.get(position)).centerCrop().placeholder(R.color.test).crossFade().into(image);return view;}
}

item

<?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" ><ImageView android:id="@+id/image"android:layout_width="wrap_content"android:layout_height="wrap_content"android:scaleType="centerCrop"/></LinearLayout>