将所选图像从库中上传到gridview
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这个应用程序包括打开照片库并选择我需要的照片库，然后将它们上传到应用程序的gridview，问题是当我选择画廊的图像时，他们不会在gridview中上传图像，我认为错误可能是在提取图像的路径并在适配器中实例化时，请告诉我问题所在。我在这里留下代码。
public class MainActivity extends AppCompatActivity {
final int COD_SELECCIONA=1;
String[]paths = new String[]{};
ArrayList<String> imagesEncodedList;
GridView imagenesGrid;
Button btnFoto;
ArrayList<String> array;
FileInputStream in;
File file = null;
private GridView gridView;
private GridViewAdapter gridAdapter;
public MainActivity() {
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imagesEncodedList =new ArrayList<>();
gridView = (GridView) findViewById(R.id.imagenesGrid);
btnFoto= (Button) findViewById(R.id.btnFoto);
}
private void grid() {
gridAdapter = new GridViewAdapter(this,paths);
gridView.setAdapter(gridAdapter);
}
public void cargarImagen() {
final CharSequence[] opciones={"Cargar Imagen","Cancelar"};
final AlertDialog.Builder alertOpciones=new AlertDialog.Builder(MainActivity.this);
alertOpciones.setTitle("Seleccione una Opción");
alertOpciones.setItems(opciones, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
if (opciones[i].equals("Cargar Imagen")){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
String[] extraMimeTypes = {"image/*", "video/*"};
intent.putExtra(Intent.EXTRA_MIME_TYPES, extraMimeTypes);
intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
startActivityForResult(Intent.createChooser(intent,"Select Picture"), COD_SELECCIONA);
}else{
dialogInterface.dismiss(); } }
});
alertOpciones.show();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
try {
if (requestCode == COD_SELECCIONA && resultCode == RESULT_OK
&& null != data) {
ClipData clipData = data.getClipData();
if(clipData != null){
for(int i=0; i<clipData.getItemCount(); i++){
ClipData.Item item = clipData.getItemAt(i);
Uri uri = item.getUri();
paths = new String[]{getRealPathFromURI(uri)};
}
}
} else {
Toast.makeText(this, "You haven't picked Image",
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG)
.show();
}
super.onActivityResult(requestCode, resultCode, data);
grid();
}
public String getRealPathFromURI(Uri contentUri) {
String[] proj = {MediaStore.Images.Media.DATA};
CursorLoader cursorLoader = new CursorLoader(
this,
contentUri, proj, null, null, null);
Cursor cursor = cursorLoader.loadInBackground();
int column_index =
cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
public void onClick(View view) {
switch (view.getId()) {
case R.id.btnFoto:
cargarImagen();
break;
} }}
<<<<<<<<<适配器>>>>>>>>
public class GridViewAdapter extends BaseAdapter {
private Activity activity;
private String[] filepath;
private static LayoutInflater inflater = null;
public GridViewAdapter(Activity a, String[] fpath) {
activity = a;
filepath = fpath;
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return filepath.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.grid_item, null);
ImageView image = (ImageView) vi.findViewById(R.id.imagen);
Bitmap bmp = BitmapFactory.decodeFile(filepath[position]);
image.setImageBitmap(bmp);
return vi;
}}
<<<<<<<<<活动主页>>>>>>>>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical">
<Button
android:id="@+id/btnFoto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:onClick="onClick"
android:text="Button" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:id="@+id/toolbar"
android:background="?attr/colorPrimary"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />
<GridView
android:id="@+id/imagenesGrid"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="100dp"
android:gravity="center"
android:horizontalSpacing="5dp"
android:numColumns="auto_fit"
android:verticalSpacing="5dp" />
</LinearLayout>
<<<<<<<<<活动项目适配器>>>>>>>>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="@+id/imagen"
android:layout_width="100dp"
android:layout_height="130dp"
android:scaleType="centerCrop"
card_view:srcCompat="@android:drawable/ic_menu_camera" />
</LinearLayout>
</android.support.v7.widget.CardView>
<<<<<<<<< Manifest >>>>>>>>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.darkenemig.galeriagridview">
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="cunoraz.ACTION_PICK" />
<action android:name="cunoraz.ACTION_MULTIPLE_PICK" />
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
答案
有时图像大小会导致运行时出错，请尝试缩小图像大小，
bitmap= scaleDown(bitmap,700,true);
agentamage.setImageBitmap(bitmap);
public static Bitmap scaleDown(Bitmap realImage, float maxImageSize,
boolean filter) {
float ratio = Math.min(
(float) maxImageSize / realImage.getWidth(),
(float) maxImageSize / realImage.getHeight());
int width = Math.round((float) ratio * realImage.getWidth());
int height = Math.round((float) ratio * realImage.getHeight());
Bitmap newBitmap = Bitmap.createScaledBitmap(realImage, width,
height, filter);
if (ratio>=1)
{
return realImage;
}
else {
return newBitmap;
}
}
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