小编Anu*_*nuj的帖子

我制作了一个应用程序，在其中单击按钮时，我滑动了一个线性布局。滑动线性布局的代码工作正常，但问题是滑动时滞后。此外，我设置的滑动布局的高度看起来并不适用于所有屏幕尺寸（特别是在 Nexus 5 上）。请帮帮我

xml

<?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">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/iv_upload_add"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:src="@drawable/add" />


        <LinearLayout
            android:id="@+id/ll_upload_options"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:background="@drawable/choosefile_bg"
            android:gravity="center"
            android:orientation="vertical">

            <pocketdocs.indiehustlers.com.pocketdocsv2.Utils.TextViewGeneral
                android:id="@+id/tv_upload_gallery"
                style="@style/text_view"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="20dp"
                android:padding="5dp"
                android:text="GALLERY"
                android:textSize="20sp"
                android:visibility="visible" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="1dp"
                android:layout_marginLeft="30dp"
                android:layout_marginRight="30dp"

                android:background="@drawable/line" />

            <pocketdocs.indiehustlers.com.pocketdocsv2.Utils.TextViewGeneral
                android:id="@+id/tv_upload_camera"
                style="@style/text_view"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="bottom"
                android:padding="5dp"
                android:text="CAMERA"
                android:textSize="20sp"
                android:visibility="visible" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="1dp"
                android:layout_marginLeft="30dp"
                android:layout_marginRight="30dp"

                android:background="@drawable/line" />

            <pocketdocs.indiehustlers.com.pocketdocsv2.Utils.TextViewGeneral
                android:id="@+id/tv_upload_file"
                style="@style/text_view"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="bottom"
                android:padding="5dp"
                android:text="FILE"
                android:textSize="20sp"
                android:visibility="visible" />


        </LinearLayout> …

我创建了一个应用程序,我允许用户从图库中选择图像或从相机拍照并上传该图像到Web服务器.这个代码工作正常.现在在其他屏幕上我从Web服务器下载图像并存储在SD卡中.如果从图库中选择图像,图像正在图像视图中显示,但如果从相机捕获图像,即使文件存在于图像视图中,图像也未显示在图像视图中SD卡

用于显示图像和从服务器下载的代码

 private static class DownloadImage extends AsyncTask<String, Void, String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

        }

        @Override
        protected String doInBackground(String... params) {
            String filePath = downloadFile("my web service");
            return filePath;
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);

            if (result.equalsIgnoreCase("")) {
                ivProfilePic.setImageDrawable(context.getResources().getDrawable(R.drawable.user_default));
                progressBar.setVisibility(View.GONE);
            } else {
              profilePicPath = result;
                Bitmap bitmapProfilePic = BitmapFactory.decodeFile(profilePicPath);
                ivProfilePic.setImageBitmap(bitmapProfilePic);



                progressBar.setVisibility(View.GONE);


            }


        }


    }

    public static String downloadFile(String url, String dest_file_path) {
        try {
            File dest_file = new File(dest_file_path);
            URL u = new URL(url); …

我正在使用gridview来显示一些图像.我做了代码,但我仍然没有得到任何图像

定制适配器

public class CustomAdapter extends BaseAdapter {

    private Context context;
    private int[] images;

    public CustomAdapter(Context context, int[] images) {
        this.context = context;
        this.images = images;
    }

    @Override
    public int getCount() {
        return images.length;
    }

    @Override
    public Object getItem(int position) {
        return images[position];
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(R.layout.custom_trips_frag_row, parent, false);
// …

我正在创建一个应用程序,其中我使用了sqlite db.I已成功创建表并将数据插入其中.但是当我尝试删除数据时,查询似乎不起作用.

码

public void deleteSubject(int Id) {
        String query = "DELETE  FROM " + TABLE_NAME + " WHERE " + DataBaseColumns.SUBJECT_ID + "=" + Id;
//        String whereClause = DataBaseColumns.SUBJECT_ID + "=?";
        database = openDb();
        Cursor cursor = null;
        try {
//            result = database.delete(TABLE_NAME, whereClause, new String[Id]);
            cursor = database.rawQuery(query, null);
        } catch (SQLiteException e) {
            Log.e("Error in delete Subjects", e.getMessage());
        }
        database = closeDb();
        cursor.close();


    }