效果图

这里主要用到了AsyncQueryHandler对象来查询手机图片资源,它内部是继承了Handler对象的.通过startQuery方法可以执行异步的查询.而如何使用ContentResolver的query方法的话,查询是在UI线程执行的,这样效果不太好,手机图片多的话,容易造成UI阻塞,通常如果采用这种方式的话,都会另起一个子线程来执行的,查询完毕在通过Handler发送消息来刷新UI,这种做法的话用起来感觉有点麻烦,因此采用AsyncQueryHandler将是一个不错的选择.

AsyncQueryHandler的使用介绍

构造方法
需要传入ContentResolver
public AsyncQueryHandler(ContentResolver cr)
四个回调方法,回调方法是运行在UI线程的,可以放心的操作UI

个人感觉方法的注释也已经说的很清楚了,其实就是增、删、查、改的异步操作完成后会执行的回调.

/**3. Called when an asynchronous query is completed.4.  5. @param token the token to identify the query, passed in from5.            {@link #startQuery}.6. @param cookie the cookie object passed in from {@link #startQuery}.7. @param cursor The cursor holding the results from the query.*/
protected void onQueryComplete(int token, Object cookie, Cursor cursor) {// Empty
}
/**8. Called when an asynchronous insert is completed.9.  11. @param token the token to identify the query, passed in from10.        {@link #startInsert}.11. @param cookie the cookie object that's passed in from12.        {@link #startInsert}.13. @param uri the uri returned from the insert operation.*/
protected void onInsertComplete(int token, Object cookie, Uri uri) {// Empty
}
/**14. Called when an asynchronous update is completed.15.  18. @param token the token to identify the query, passed in from16.        {@link #startUpdate}.17. @param cookie the cookie object that's passed in from18.        {@link #startUpdate}.19. @param result the result returned from the update operation*/
protected void onUpdateComplete(int token, Object cookie, int result) {// Empty
}
/**20. Called when an asynchronous delete is completed.21.  25. @param token the token to identify the query, passed in from22.        {@link #startDelete}.23. @param cookie the cookie object that's passed in from24.        {@link #startDelete}.25. @param result the result returned from the delete operation*/
protected void onDeleteComplete(int token, Object cookie, int result) {// Empty
}

相对应的也有四个异步执行的增、删、查、改的方法.

//增加
public final void startInsert(int token, Object cookie, Uri uri, ContentValues initialValues)//查询        public void startQuery(int token, Object cookie, Uri uri,String[] projection, String selection, String[] selectionArgs,String orderBy) {//更新
public final void startUpdate(int token, Object cookie, Uri uri,ContentValues values, String selection, String[] selectionArgs)//删除
public final void startDelete(int token, Object cookie, Uri uri,String selection, String[] selectionArgs) {

这里主要解释下token和cookie这2个参数的含义,这2个分别代表Message里面的what和obj属性,由此可见AsyncQueryHandler内部确实是通过Handler和Message来工作的.以下这段源码就很直观的体现了这点.

protected class WorkerHandler extends Handler {public WorkerHandler(Looper looper) {super(looper);}@Overridepublic void handleMessage(Message msg) {final ContentResolver resolver = mResolver.get();if (resolver == null) return;WorkerArgs args = (WorkerArgs) msg.obj;int token = msg.what;int event = msg.arg1;switch (event) {case EVENT_ARG_QUERY:Cursor cursor;try {cursor = resolver.query(args.uri, args.projection,args.selection, args.selectionArgs,args.orderBy);// Calling getCount() causes the cursor window to be filled,// which will make the first access on the main thread a lot faster.if (cursor != null) {cursor.getCount();}} catch (Exception e) {Log.w(TAG, "Exception thrown during handling EVENT_ARG_QUERY", e);cursor = null;}args.result = cursor;break;case EVENT_ARG_INSERT:args.result = resolver.insert(args.uri, args.values);break;case EVENT_ARG_UPDATE:args.result = resolver.update(args.uri, args.values, args.selection,args.selectionArgs);break;case EVENT_ARG_DELETE:args.result = resolver.delete(args.uri, args.selection, args.selectionArgs);break;}// passing the original token value back to the caller// on top of the event values in arg1.Message reply = args.handler.obtainMessage(token);reply.obj = args;reply.arg1 = msg.arg1;if (localLOGV) {Log.d(TAG, "WorkerHandler.handleMsg: msg.arg1=" + msg.arg1+ ", reply.what=" + reply.what);}reply.sendToTarget();}
}

好了,介绍完AsyncQueryHandler,直接上demo吧.文章最下边有下载地址.

MainActivity

用于展示相册列表

/*** 展示相册*/
public class MainActivity extends AppCompatActivity {private ListView mListView;private List<AlbumBean> mAlbumBeanList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);getWindow().setBackgroundDrawable(new ColorDrawable(Color.WHITE));mListView = new ListView(this);mListView.setCacheColorHint(Color.TRANSPARENT);mListView.setSelector(new ColorDrawable());setContentView(mListView);queryAlbum();initListener();}/*** 查询相片*/private void queryAlbum() {AsyncQueryHandler queryHandler = new AsyncQueryHandler(getContentResolver()) {@Overrideprotected void onQueryComplete(int token, Object cookie, Cursor cursor) {//查询结束时回调,这里回调的时候是UI线程mAlbumBeanList = AlbumBean.parserList(cursor);AlbumAdapter adapter = new AlbumAdapter(MainActivity.this, mAlbumBeanList);mListView.setAdapter(adapter);}};int token = 0; //相当于message的whatObject cookie = null;//相当于message的objUri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;//查询的uriString[] projection = new String[]{ //查询的列MediaStore.Images.Media._ID, //如果要使用CursorAdapter,那么就必须查询此字段MediaStore.Images.Media.DATA //相片的路径};String selection = MediaStore.Images.Media.MIME_TYPE + "=? or " + MediaStore.Images.Media.MIME_TYPE + "=?";//查询的条件String[] selectionArgs = new String[]{ //查询条件?号后面的参数"image/jpeg", "image/png"};String orderBy = MediaStore.Images.Media.DATE_MODIFIED + " DESC";//根据修改日期降序排序// 这个方法会运行在子线程queryHandler.startQuery(token, cookie, uri, projection, selection, selectionArgs, orderBy);}/*** 初始化监听*/private void initListener() {mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {AlbumBean albumBean = mAlbumBeanList.get(position);Intent intent = new Intent(MainActivity.this, PhotoListActivity.class);Bundle bundle = new Bundle();if (position == 0) {//当前点击的是所有相册bundle.putStringArrayList("photoList", (ArrayList<String>) albumBean.allPhotoList);} else {//点击的是其他相册bundle.putStringArrayList("photoList", (ArrayList<String>) albumBean.albumPhotoList);}intent.putExtras(bundle);startActivity(intent);}});}
}

PhotoListActivity

用于展示具体的某个相册

/**具体的某个相册* Created by mChenys on 2016/1/24.*/
public class PhotoListActivity extends Activity {private GridView mGridView;private List<String> mPhotoList;private BitmapUtils mBitmapUtils;private int mWidth, mHeight;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);initData();initView();showPhotoList();initListener();}private void initListener() {mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {Intent intent = new Intent(PhotoListActivity.this, PhotoViewActivity.class);intent.putExtra("photo", mPhotoList.get(position));startActivity(intent);}});}private void initData() {Intent intent = getIntent();if (null != intent) {Bundle bundle = intent.getExtras();if (null != bundle) {mPhotoList = bundle.getStringArrayList("photoList");System.out.println("mPhotoList:" + mPhotoList);}}mBitmapUtils = new BitmapUtils(this);mBitmapUtils.configDefaultLoadingImage(R.drawable.app_default);mWidth = (int) ((SizeUtils.getStreenWidth(this) - 2 * SizeUtils.px2dp(this, 1)) / 3.0f);mHeight = mWidth;System.out.println("mWidth:" + mWidth + " mHeight:" + mHeight + " SizeUtils.getStreenWidth(this):" +SizeUtils.getStreenWidth(this));}private void initView() {mGridView = new GridView(this);mGridView.setNumColumns(3);mGridView.setVerticalSpacing(SizeUtils.px2dp(this, 1));mGridView.setHorizontalSpacing(SizeUtils.px2dp(this, 1));mGridView.setCacheColorHint(Color.TRANSPARENT);mGridView.setBackgroundColor(Color.parseColor("#262424"));mGridView.setSelector(new ColorDrawable());setContentView(mGridView);}private void showPhotoList() {mGridView.setAdapter(new BaseAdapter() {@Overridepublic int getCount() {return mPhotoList == null ? 0 : mPhotoList.size();}@Overridepublic String getItem(int position) {return mPhotoList == null ? "" : mPhotoList.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {if (null == convertView) {ImageView imageView = new ImageView(PhotoListActivity.this);imageView.setLayoutParams(new AbsListView.LayoutParams(mWidth, mHeight));imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);convertView = imageView;}ImageView imageView = (ImageView) convertView;mBitmapUtils.display(imageView, getItem(position));return convertView;}});}
}

PhotoViewActivity

用于展示具体的某张图片

/*** 用于展示具体的某张图片* Created by mChenys on 2016/1/24.*/
public class PhotoViewActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);getWindow().setBackgroundDrawable(new ColorDrawable(Color.BLACK));String photoPath = getIntent().getStringExtra("photo");RelativeLayout rootView = new RelativeLayout(this);//创建TextView显示照片的路径TextView textView = new TextView(this);RelativeLayout.LayoutParams tvLp = new RelativeLayout.LayoutParams(-1, -2);tvLp.addRule(RelativeLayout.ALIGN_PARENT_TOP);textView.setLayoutParams(tvLp);textView.setText(photoPath);textView.setTextColor(Color.WHITE);//创建支持缩放的ImageViewRelativeLayout.LayoutParams ivLp = new RelativeLayout.LayoutParams(-1, -1);ZoomImageView zoomImageView = new ZoomImageView(this);zoomImageView.setLayoutParams(ivLp);zoomImageView.setImageBitmap(BitmapFactory.decodeFile(photoPath));//添加ImageViewrootView.addView(zoomImageView);//添加TextViewrootView.addView(textView);setContentView(rootView);}
}

源码下载

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效果图