我的申请表中有SqliteDatabase。在此数据库中，我保存 Sting 和 Blob（用于保存图像）。此图像使用 byte [] 保存在应用程序中。我借助以下代码将此图像转换为位图：
byte[] Recycler_imageByte;
Bitmap Recycler_theImage;
holder.Recycler_imageByte = data.get(position).getKey_image();
ByteArrayInputStream imageStream = new ByteArrayInputStream(holder.Recycler_imageByte);
holder.Recycler_theImage = BitmapFactory.decodeStream(imageStream);
我想在Glide libary中显示此图像，我编写了以下代码：
Glide.with(context).load(holder.Recycler_theImage).asBitmap().into(holder.Recycler_adapter_image);
但是，当我运行应用程序时，会显示以下错误：
03-15 10:23:14.311 22440-22440/com.tellfa.dastanak E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.tellfa.dastanak, PID: 22440
java.lang.IllegalArgumentException: Unknown type class android.graphics.Bitmap. You must provide a Model of a type for which there is a registered ModelLoader, if you are using a custom model, you must first call Glide#register with a ModelLoaderFactory for your custom model class
at com.bumptech.glide.RequestManager.loadGeneric(RequestManager.java:629)
at com.bumptech.glide.RequestManager.load(RequestManager.java:598)
at com.tellfa.dastanak.Adapters.fragment_RecyclerAdapter.onBindViewHolder(fragment_RecyclerAdapter.java:54)
at com.tellfa.dastanak.Adapters.fragment_RecyclerAdapter.onBindViewHolder(fragment_RecyclerAdapter.java:27)
at jp.wasabeef.recyclerview.adapters.AnimationAdapter.onBindViewHolder(AnimationAdapter.java:55)
at jp.wasabeef.recyclerview.adapters.AnimationAdapter.onBindViewHolder(AnimationAdapter.java:55)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5217)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5250)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4487)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4363)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1961)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1370)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1333)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:562)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2900)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:584)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1627)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1037)
at android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:747)
at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1156)
at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:760)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1043)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
at android.view.View.layout(View.java:15654)
at android.view.ViewGroup.layout(ViewGroup.java:4969)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1705)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1559)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1468)
at android.view.View.layout(Vi
如何修复它并在Glide库中显示位图？谢谢大家。
答案 0 :(得分：3)
使用以下方法将图像转换为字节数组并以BLOB
的形式存储到数据库中public String bitmapToString(Bitmap bmp) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, os);
byte[] bytes = os.toByteArray();
return Base64.encodeToString(bytes, Base64.DEFAULT);
}
当您想使用Glide使用以下
进入图像视图时public void stringToBitmap(String str) {
byte[] bytesImage = Base64.decode(str, Base64.DEFAULT);
//Bitmap bitmap = BitmapFactory.decodeByteArray(bytesImage, 0, bytesImage.length);
//ivImage.setImageBitmap(bitmap);
// using glide
Glide.with(this).load(bytesImage).asBitmap().into(ivImage);
}
从数据库中存储和检索图像的简单示例
<强> activity_main.xml中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/btnInsert"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="Insert into DB" />
<Button
android:id="@+id/btnView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="View from DB" />
<ImageView
android:id="@+id/ivImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true" />
</LinearLayout>
<强> MainActivity.java
public class MainActivity extends AppCompatActivity {
private DatabaseHelper databaseHelper;
private SQLiteDatabase db;
private Button btnInsert, btnView;
private ImageView ivImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
databaseHelper = new DatabaseHelper(this);
db = databaseHelper.getWritableDatabase();
ivImage = (ImageView) findViewById(R.id.ivImage);
btnInsert = (Button) findViewById(R.id.btnInsert);
btnView = (Button) findViewById(R.id.btnView);
btnInsert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
insertImage();
}
});
btnView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
viewFromDb();
}
});
}
private void insertImage() {
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
ContentValues values = new ContentValues();
values.put("image", bitmapToString(bmp));
db.insert("table_image", null, values);
Toast.makeText(this, "Insert Successful",Toast.LENGTH_SHORT).show();
}
private void viewFromDb() {
String sql = "select * from table_image";
ArrayList<String> images = new ArrayList<>();
Cursor cursor = db.rawQuery(sql, null);
if (cursor != null) {
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
String img = cursor.getString(cursor.getColumnIndex("image"));
images.add(img);
cursor.moveToNext();
}
}
cursor.close();
if (images.size() > 0) {
// get last image
stringToBitmap(images.get(images.size()-1));
}
}
public String bitmapToString(Bitmap bmp) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, os);
byte[] bytes = os.toByteArray();
//return Base64.encodeToString(bytes, Base64.DEFAULT);
return Base64.encodeToString(bytes, Base64.DEFAULT);
}
public void stringToBitmap(String str) {
byte[] bytesImage = Base64.decode(str, Base64.DEFAULT);
Bitmap bitmap = BitmapFactory.decodeByteArray(bytesImage, 0, bytesImage.length);
ivImage.setImageBitmap(bitmap);
//Glide.with(this).load(bytesImage).asBitmap().into(ivImage);
}
}
<强> DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper {
private static final String TAG = "DatabaseHelper";
public static String DB_PATH;
public static String DB_NAME = "mdb";
private static SQLiteDatabase myDataBase;
private static DatabaseHelper helperInstance;
private final Context myContext;
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
DB_PATH = "/data/data/" + myContext.getPackageName() + "/databases/";
}
@Override
public void onCreate(SQLiteDatabase db) {
Log.e(TAG, "On Create");
String sql = "CREATE TABLE IF NOT EXISTS table_image (_id INTEGER PRIMARY KEY AUTOINCREMENT, image BLOB)";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
我希望它对你有用。