Picasso 正在加载 URL 但没有显示图片
Picasso is loading URL but no picture is shown
我遇到了迄今为止最奇怪的问题之一。我正在创建一个应用程序，它通过不同的活动发送有关书籍和作者的信息。我在意图的帮助下发送它们。我的问题在作者部分。我正在发送姓名、年龄和照片。姓名和年龄已成功发送，据我所知，调试器也已成功发送图像。但是，Picasso 拒绝在 ImageView 中加载它。没有显示任何错误，我不知道发生了什么。这是一些代码。
此函数重置我的数据库中的信息：
public void resetAuthor()
{
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_NAME_AUTHORS);
db.execSQL("DELETE FROM SQLITE_SEQUENCE WHERE NAME = '" + TABLE_NAME_AUTHORS + "'");
addBegginingInfoAuthor("J.K.Rowling", 54, "https://www.biographyonline.net/wp-content/uploads/2014/05/jk-rowling4.jpg");
addBegginingInfoAuthor("J.R.R. Tolken", 81, "https://www.biography.com/.image/t_share/MTE5NTU2MzE2Mzg4MzYxNzM5/jrr-tolkien-9508428-1-402.jpg");
addBegginingInfoAuthor("Arthur Conan Doyle", 71, "https://upload.wikimedia.org/wikipedia/commons/b/bd/Arthur_Conan_Doyle_by_Walter_Benington%2C_1914.png");
}
AuthorAdapter class。这是我的回收者视图的适配器，它显示有关作者的详细信息。这也是我开始打算搬到另一个地方的地方 activity:
@Override
public void onBindViewHolder(@NonNull AuthorsViewHolder holder, int position) {
if (!mCursor.moveToPosition(position))
{
return;
}
final int author_id = mCursor.getInt(mCursor.getColumnIndex(DatabaseHelper.AUTHORS_COL_1));
final String name = mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.AUTHORS_COL_2));
final String age = mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.AUTHORS_COL_3));
final String image = mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.AUTHORS_COL_4));
holder.authorIndex.setText(String.valueOf(author_id));
holder.authorName.setText(name);
holder.authorAge.setText(String.valueOf(age));
holder.authorName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), displayBooksFromAuthor.class);
intent.putExtra("Author_id", author_id);
intent.putExtra("Author_name", name);
intent.putExtra("Author_age", age);
intent.putExtra("Author_image", image);
mContext.startActivity(intent);
}
});
}
最后，我的 DisplayAuthorDetails class 从意图接收数据并显示它：
int author_id = intent.getIntExtra("Author_id", 0);
String author_name = intent.getStringExtra("Author_name");
String author_age = intent.getStringExtra("Author_age");
String author_picture = intent.getStringExtra("Author_image");
et_name.setText(author_name);
et_age.setText(author_age);
et_id.setText(String.valueOf(author_id));
Picasso.get().load(author_picture).into(author_image);
我有库依赖和清单文件中的两个权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
implementation 'com.squareup.picasso:picasso:2.71828
这个问题最奇怪的部分是，当我创建一个全新的项目并尝试加载它成功加载的图像时。任何帮助表示赞赏。谢谢你的时间
编辑
数据库助手class:
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "Books and Authors.db";
public static final String TABLE_NAME_AUTHORS = "Authors_table";
public static final String AUTHORS_COL_1 = "Author_ID";
public static final String AUTHORS_COL_2 = "Name";
public static final String AUTHORS_COL_3 = "Age";
public static final String AUTHORS_COL_4 = "Author_picture";
public static final String TABLE_NAME_BOOKS = "Books_table";
public static final String BOOKS_COL_1 = "Book_ID";
public static final String BOOKS_COL_2 = "Author_Foreign";
public static final String BOOKS_COL_3 = "Title";
public static final String BOOKS_COL_4 = "Price";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 2);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table " + TABLE_NAME_BOOKS + " (Book_ID INTEGER PRIMARY KEY AUTOINCREMENT, Title TEXT," + "Author_Foreign INT," + "Price TEXT)");
db.execSQL("create table " + TABLE_NAME_AUTHORS + " (Author_ID INTEGER PRIMARY KEY AUTOINCREMENT, Name TEXT," + "Age INTEGER," + "Author_picture TEXT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME_AUTHORS);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME_BOOKS);
onCreate(db);
}
public boolean insertDataBooks(String title, float price) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(BOOKS_COL_3, title);
contentValues.put(BOOKS_COL_4, price);
long result = db.insert(TABLE_NAME_BOOKS, null, contentValues);
if (result == 1) {
return false;
} else {
return true;
}
}
public boolean insertDataAuthors(String name, int age) {
SQLiteDatabase mydb = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(AUTHORS_COL_2, name);
contentValues.put(AUTHORS_COL_3, age);
long result = mydb.insert(TABLE_NAME_AUTHORS, null, contentValues);
if (result == 1) {
return false;
} else {
return true;
}
}
public boolean addBegginingInfo(int foreign_author_id, String title, double price) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(BOOKS_COL_2, foreign_author_id);
contentValues.put(BOOKS_COL_3, title);
contentValues.put(BOOKS_COL_4, price);
long result = db.insert(TABLE_NAME_BOOKS, null, contentValues);
if (result == 1) {
return false;
} else {
return true;
}
}
public boolean addBegginingInfoAuthor(String name, int age, String image)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(AUTHORS_COL_2, name);
contentValues.put(AUTHORS_COL_3, age);
contentValues.put(AUTHORS_COL_4, image);
long result = db.insert(TABLE_NAME_AUTHORS, null, contentValues);
if (result == 1) {
return false;
} else {
return true;
}
}
public Integer deleteBook(String index) {
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(TABLE_NAME_BOOKS, "Book_ID = ?", new String[]{index});
}
public Integer deleteAuthor(String authorIndex) {
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(TABLE_NAME_AUTHORS, "Author_ID = ?", new String[]{authorIndex});
}
public void resetBookTable() {
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_NAME_BOOKS);
db.execSQL("DELETE FROM SQLITE_SEQUENCE WHERE NAME = '" + TABLE_NAME_BOOKS + "'");
addBegginingInfo(1, "Harry Potter", 9.99);
addBegginingInfo(1, "Fantastic Beasts", 14.99);
addBegginingInfo(2, "Lord of the Rings", 8.99);
addBegginingInfo(2, "The Hobbit", 12.99);
addBegginingInfo(3, "Sherlock Holmes", 6.99);
addBegginingInfo(3, "Valley of Fear", 7.99);
}
public void resetAuthor()
{
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_NAME_AUTHORS);
db.execSQL("DELETE FROM SQLITE_SEQUENCE WHERE NAME = '" + TABLE_NAME_AUTHORS + "'");
addBegginingInfoAuthor("J.K.Rowling", 54, "https://www.biographyonline.net/wp-content/uploads/2014/05/jk-rowling4.jpg");
addBegginingInfoAuthor("J.R.R. Tolken", 81, "https://www.biography.com/.image/t_share/MTE5NTU2MzE2Mzg4MzYxNzM5/jrr-tolkien-9508428-1-402.jpg");
addBegginingInfoAuthor("Arthur Conan Doyle", 71, "https://upload.wikimedia.org/wikipedia/commons/b/bd/Arthur_Conan_Doyle_by_Walter_Benington%2C_1914.png");
}
}
经过几个小时的尝试，我终于发现要解决这个问题，我只需要在模拟器上重新安装应用程序即可。
我遇到了迄今为止最奇怪的问题之一。我正在创建一个应用程序，它通过不同的活动发送有关书籍和作者的信息。我在意图的帮助下发送它们。我的问题在作者部分。我正在发送姓名、年龄和照片。姓名和年龄已成功发送，据我所知，调试器也已成功发送图像。但是，Picasso 拒绝在 ImageView 中加载它。没有显示任何错误，我不知道发生了什么。这是一些代码。
此函数重置我的数据库中的信息：
public void resetAuthor()
{
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_NAME_AUTHORS);
db.execSQL("DELETE FROM SQLITE_SEQUENCE WHERE NAME = '" + TABLE_NAME_AUTHORS + "'");
addBegginingInfoAuthor("J.K.Rowling", 54, "https://www.biographyonline.net/wp-content/uploads/2014/05/jk-rowling4.jpg");
addBegginingInfoAuthor("J.R.R. Tolken", 81, "https://www.biography.com/.image/t_share/MTE5NTU2MzE2Mzg4MzYxNzM5/jrr-tolkien-9508428-1-402.jpg");
addBegginingInfoAuthor("Arthur Conan Doyle", 71, "https://upload.wikimedia.org/wikipedia/commons/b/bd/Arthur_Conan_Doyle_by_Walter_Benington%2C_1914.png");
}
AuthorAdapter class。这是我的回收者视图的适配器，它显示有关作者的详细信息。这也是我开始打算搬到另一个地方的地方 activity:
@Override
public void onBindViewHolder(@NonNull AuthorsViewHolder holder, int position) {
if (!mCursor.moveToPosition(position))
{
return;
}
final int author_id = mCursor.getInt(mCursor.getColumnIndex(DatabaseHelper.AUTHORS_COL_1));
final String name = mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.AUTHORS_COL_2));
final String age = mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.AUTHORS_COL_3));
final String image = mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.AUTHORS_COL_4));
holder.authorIndex.setText(String.valueOf(author_id));
holder.authorName.setText(name);
holder.authorAge.setText(String.valueOf(age));
holder.authorName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), displayBooksFromAuthor.class);
intent.putExtra("Author_id", author_id);
intent.putExtra("Author_name", name);
intent.putExtra("Author_age", age);
intent.putExtra("Author_image", image);
mContext.startActivity(intent);
}
});
}
最后，我的 DisplayAuthorDetails class 从意图接收数据并显示它：
int author_id = intent.getIntExtra("Author_id", 0);
String author_name = intent.getStringExtra("Author_name");
String author_age = intent.getStringExtra("Author_age");
String author_picture = intent.getStringExtra("Author_image");
et_name.setText(author_name);
et_age.setText(author_age);
et_id.setText(String.valueOf(author_id));
Picasso.get().load(author_picture).into(author_image);
我有库依赖和清单文件中的两个权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
implementation 'com.squareup.picasso:picasso:2.71828
这个问题最奇怪的部分是，当我创建一个全新的项目并尝试加载它成功加载的图像时。任何帮助表示赞赏。谢谢你的时间
编辑
数据库助手class:
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "Books and Authors.db";
public static final String TABLE_NAME_AUTHORS = "Authors_table";
public static final String AUTHORS_COL_1 = "Author_ID";
public static final String AUTHORS_COL_2 = "Name";
public static final String AUTHORS_COL_3 = "Age";
public static final String AUTHORS_COL_4 = "Author_picture";
public static final String TABLE_NAME_BOOKS = "Books_table";
public static final String BOOKS_COL_1 = "Book_ID";
public static final String BOOKS_COL_2 = "Author_Foreign";
public static final String BOOKS_COL_3 = "Title";
public static final String BOOKS_COL_4 = "Price";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 2);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table " + TABLE_NAME_BOOKS + " (Book_ID INTEGER PRIMARY KEY AUTOINCREMENT, Title TEXT," + "Author_Foreign INT," + "Price TEXT)");
db.execSQL("create table " + TABLE_NAME_AUTHORS + " (Author_ID INTEGER PRIMARY KEY AUTOINCREMENT, Name TEXT," + "Age INTEGER," + "Author_picture TEXT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME_AUTHORS);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME_BOOKS);
onCreate(db);
}
public boolean insertDataBooks(String title, float price) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(BOOKS_COL_3, title);
contentValues.put(BOOKS_COL_4, price);
long result = db.insert(TABLE_NAME_BOOKS, null, contentValues);
if (result == 1) {
return false;
} else {
return true;
}
}
public boolean insertDataAuthors(String name, int age) {
SQLiteDatabase mydb = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(AUTHORS_COL_2, name);
contentValues.put(AUTHORS_COL_3, age);
long result = mydb.insert(TABLE_NAME_AUTHORS, null, contentValues);
if (result == 1) {
return false;
} else {
return true;
}
}
public boolean addBegginingInfo(int foreign_author_id, String title, double price) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(BOOKS_COL_2, foreign_author_id);
contentValues.put(BOOKS_COL_3, title);
contentValues.put(BOOKS_COL_4, price);
long result = db.insert(TABLE_NAME_BOOKS, null, contentValues);
if (result == 1) {
return false;
} else {
return true;
}
}
public boolean addBegginingInfoAuthor(String name, int age, String image)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(AUTHORS_COL_2, name);
contentValues.put(AUTHORS_COL_3, age);
contentValues.put(AUTHORS_COL_4, image);
long result = db.insert(TABLE_NAME_AUTHORS, null, contentValues);
if (result == 1) {
return false;
} else {
return true;
}
}
public Integer deleteBook(String index) {
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(TABLE_NAME_BOOKS, "Book_ID = ?", new String[]{index});
}
public Integer deleteAuthor(String authorIndex) {
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(TABLE_NAME_AUTHORS, "Author_ID = ?", new String[]{authorIndex});
}
public void resetBookTable() {
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_NAME_BOOKS);
db.execSQL("DELETE FROM SQLITE_SEQUENCE WHERE NAME = '" + TABLE_NAME_BOOKS + "'");
addBegginingInfo(1, "Harry Potter", 9.99);
addBegginingInfo(1, "Fantastic Beasts", 14.99);
addBegginingInfo(2, "Lord of the Rings", 8.99);
addBegginingInfo(2, "The Hobbit", 12.99);
addBegginingInfo(3, "Sherlock Holmes", 6.99);
addBegginingInfo(3, "Valley of Fear", 7.99);
}
public void resetAuthor()
{
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_NAME_AUTHORS);
db.execSQL("DELETE FROM SQLITE_SEQUENCE WHERE NAME = '" + TABLE_NAME_AUTHORS + "'");
addBegginingInfoAuthor("J.K.Rowling", 54, "https://www.biographyonline.net/wp-content/uploads/2014/05/jk-rowling4.jpg");
addBegginingInfoAuthor("J.R.R. Tolken", 81, "https://www.biography.com/.image/t_share/MTE5NTU2MzE2Mzg4MzYxNzM5/jrr-tolkien-9508428-1-402.jpg");
addBegginingInfoAuthor("Arthur Conan Doyle", 71, "https://upload.wikimedia.org/wikipedia/commons/b/bd/Arthur_Conan_Doyle_by_Walter_Benington%2C_1914.png");
}
}
经过几个小时的尝试，我终于发现要解决这个问题，我只需要在模拟器上重新安装应用程序即可。