安卓开发之QQ图片的选择效果
来源：爱站网时间：2020-08-20编辑：网友分享
微信朋友圈或QQ空间中点击图片后会放大图片展示到我们跟前，再点击返回原来的图片，并有放大缩小的按键，下面爱站技术频道小编就为大家带来了安卓开发之QQ图片的选择效果，希望对你有帮助。
微信朋友圈或QQ空间中点击图片后会放大图片展示到我们跟前，再点击返回原来的图片，并有放大缩小的按键，下面爱站技术频道小编就为大家带来了安卓开发之QQ图片的选择效果，希望对你有帮助。
效果展示
布局文件
布局是很简单的，一个GridView，直接上布局：
layout/activity_add_photo.xml
layout/activity_add_photo_gv_items.xml 使用了自定义的view使得布局为正方形
代码实现
SquareRelativeLayout.java：
package com.shenhua.tabhostdemo.selectimg;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;
/**
* 自定义方形布局
* Created by Shenhua on 4/25/2016.
*/
public class SquareRelativeLayout extends RelativeLayout {
public SquareRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public SquareRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SquareRelativeLayout(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec));
int childWidthSize = getMeasuredWidth();
widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);
heightMeasureSpec = widthMeasureSpec;
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
UploadPhotoActivity.java： 主Activity
package com.shenhua.tabhostdemo.selectimg;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.shenhua.tabhostdemo.R;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;
/**
* Created by shenhua on 4/25/2016.
*/
public class UploadPhotoActivity extends AppCompatActivity {
private static final int IMG_COUNT = 8;
private static final String IMG_ADD_TAG = "a";
private GridView gridView;
private GVAdapter adapter;
private TextView textView;
private ImageView img;
private List list;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_photo);
gridView = (GridView) findViewById(R.id.gridview);
textView = (TextView) findViewById(R.id.send);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("发送：" + Integer.toString(list.size() - 1));
upLoad();
}
});
initData();
}
private void upLoad() {
Bitmap bitmap;
Bitmap bmpCompressed;
for (int i = 0; i ();
list.add(IMG_ADD_TAG);
}
adapter = new GVAdapter();
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView> parent, View view, int position, long id) {
if (list.get(position).equals(IMG_ADD_TAG)) {
if (list.size() ();
}
if (adapter == null) {
adapter = new GVAdapter();
}
adapter.notifyDataSetChanged();
}
private class GVAdapter extends BaseAdapter {
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(getApplication()).inflate(R.layout.activity_add_photo_gv_items, parent, false);
holder = new ViewHolder();
holder.imageView = (ImageView) convertView.findViewById(R.id.main_gridView_item_photo);
holder.checkBox = (CheckBox) convertView.findViewById(R.id.main_gridView_item_cb);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
String s = list.get(position);
if (!s.equals(IMG_ADD_TAG)) {
holder.checkBox.setVisibility(View.VISIBLE);
holder.imageView.setImageBitmap(ImageTool.createImageThumbnail(s));
} else {
holder.checkBox.setVisibility(View.GONE);
holder.imageView.setImageResource(R.mipmap.ic_photo_upload);
}
holder.checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
list.remove(position);
refreshAdapter();
}
});
return convertView;
}
private class ViewHolder {
ImageView imageView;
CheckBox checkBox;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (data == null) {
System.out.println("data null");
return;
}
if (requestCode == 0) {
final Uri uri = data.getData();
String path = ImageTool.getImageAbsolutePath(this, uri);
System.out.println(path);
if (list.size() == IMG_COUNT) {
removeItem();
refreshAdapter();
return;
}
removeItem();
list.add(path);
list.add(IMG_ADD_TAG);
refreshAdapter();
}
}
private void removeItem() {
if (list.size() != IMG_COUNT) {
if (list.size() != 0) {
list.remove(list.size() - 1);
}
}
}
}
ImageTool.java： 图片工具类
package com.shenhua.tabhostdemo.selectimg;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
/**
* Created by shenhua on 4/26/2016.
*/
public class ImageTool {
/**
* 获取图片的绝对路径，需要添加用户权限
*/
@TargetApi(19)
public static String getImageAbsolutePath(Activity context, Uri imageUri) {
if (context == null || imageUri == null)
return null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) {
if (isExternalStorageDocument(imageUri)) {
String docId = DocumentsContract.getDocumentId(imageUri);
String[] split = docId.split(":");
String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
} else if (isDownloadsDocument(imageUri)) {
String id = DocumentsContract.getDocumentId(imageUri);
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
} else if (isMediaDocument(imageUri)) {
String docId = DocumentsContract.getDocumentId(imageUri);
String[] split = docId.split(":");
String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = null;//不获取视频
} else if ("audio".equals(type)) {
contentUri = null;//不获取音频
}
String selection = MediaStore.Images.Media._ID + "=?";
String[] selectionArgs = new String[]{split[1]};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
} // MediaStore (and general)
else if ("content".equalsIgnoreCase(imageUri.getScheme())) {
if (isGooglePhotosUri(imageUri))
return imageUri.getLastPathSegment();
return getDataColumn(context, imageUri, null, null);
}
// File
else if ("file".equalsIgnoreCase(imageUri.getScheme())) {
return imageUri.getPath();
}
return null;
}
public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
String column = MediaStore.Images.Media.DATA;
String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
/**
* 创建图片缩略图
*
* @param filePath
* @return
*/
public static Bitmap createImageThumbnail(String filePath) {
Bitmap bitmap = null;
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, opts);
opts.inSampleSize = computeSampleSize(opts, -1, 128 * 128);
opts.inJustDecodeBounds = false;
try {
bitmap = BitmapFactory.decodeFile(filePath, opts);
} catch (Exception e) {
// TODO: handle exception
}
return bitmap;
}
public static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {
int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels);
int roundedSize;
if (initialSize
因为 Android4.4以上版本获得的图片URI是com.xxxxx的，因此需要在工具类里做判断，否则得不到图片的绝对地址。
工具类参考了别人的一篇博客，忘了留博客地址了，请原博主谅解。
最后需要加上一个权限：
读完爱站技术频道介绍的安卓开发之QQ图片的选择效果，相信肯定对你有帮助，最后提醒小伙伴，学习不能一蹴而就，一定要坚持不懈哦。
