所以我试图将我从图库中选择的图像上传到我的图像视图中。但图像从未出现在imageview中？该计划不会崩溃或任何事情。我使用toast消息来查看onActivityResult是否抓取了图像，并且确实如此。但它无法将其加载到图像视图中。
希望你们能提供帮助，下面是我的代码。
public class TakePhotoActivity extends AppCompatActivity implements View.OnClickListener {
private View snapButton;
private ImageButton galleryButton;
private int RESULT_LOAD_IMAGE = 1;
private String user_image_path;
private boolean pickedCamera = false;
private ImageView myImageView;
private ProgressBar myprogressBar;
//GPS
private LocationManager locationManager = null;
private LocationListener locationListener = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_photo);
setupCamera();
}
private void setupCamera()
{
snapButton = (View) findViewById(R.id.cameraActivity_CameraButton);
snapButton.setOnClickListener((View.OnClickListener) this);
snapButton.setOnClickListener(this);
galleryButton = (ImageButton) findViewById(R.id.cameraActivity_GalleryButton);
galleryButton.setOnClickListener(this);
myprogressBar = (ProgressBar) findViewById(R.id.myPB);
myprogressBar.setVisibility(View.INVISIBLE);
myImageView = (ImageView) findViewById(R.id.cameraActivity_ImageView);
}
private void grabImageFromGallery()
{
Intent imageGetter = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(imageGetter, RESULT_LOAD_IMAGE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data)
{
Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};//Array size of 1, and we put in a string
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
user_image_path = cursor.getString(columnIndex);//here we have our image path.
cursor.close();
}
Picasso.with(this).load(user_image_path).fit().centerCrop().into(myImageView);
}
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.cameraActivity_GalleryButton:
grabImageFromGallery();
break;
}
}
}
这是我的xml。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:layout_height="wrap_content"
android:layout_width="match_parent"
layout="@layout/toolbar_layout">
</include>
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/cameraActivity_ImageView"
android:layout_marginLeft="100dp"
android:layout_marginTop="50dp"/>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageButton
android:layout_width="100dp"
android:layout_height="100dp"
android:background="@drawable/circle_fb_2"
android:src="@drawable/icon_camera_red"
android:layout_marginTop="70dp"
android:layout_marginLeft="70dp"
android:id="@+id/cameraActivity_CameraButton"/>
<ImageButton
android:layout_width="100dp"
android:layout_height="100dp"
android:background="@drawable/circle_fb_2"
android:src="@drawable/icon_gallery"
android:layout_marginTop="70dp"
android:layout_marginLeft="150dp"
android:layout_alignLeft="@id/cameraActivity_CameraButton"
android:id="@+id/cameraActivity_GalleryButton"/>
<ProgressBar
android:layout_width="50dp"
android:layout_height="50dp"
android:id="@+id/myPB"
android:layout_below="@id/cameraActivity_CameraButton"
android:layout_marginLeft="170dp"/>
</RelativeLayout>
</LinearLayout>
答案 0 :(得分：2)
加载本地图像时，您有路径应该是这样的“file：///image_path.jpg”。
替换
Picasso.with(this).load(user_image_path).fit().centerCrop().into(myImageView);
带
Picasso.with(this).load("file:///"+user_image_path).fit().centerCrop().into(myImageView);
答案 1 :(得分：1)
尝试这种方式加载图像并在imageview中显示
public class LoadImage extends Activity
{
Activity activity=null;
Context context=null;
Button header_left_btn=null;
Button header_right_btn=null;
TextView header_text=null;
TableLayout image_table=null;
ArrayList<String> image_list=new ArrayList<String>();
ArrayList<Drawable> image_drawable=new ArrayList<Drawable>();
String path="";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.main);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.header);
activity=LoadImage.this;
context=LoadImage.this;
header_left_btn=(Button)findViewById(R.id.header_left_btn);
header_right_btn=(Button)findViewById(R.id.header_right_btn);
header_text=(TextView)findViewById(R.id.header_text);
image_table=(TableLayout)findViewById(R.id.image_table);
header_text.setText("Image Table");
header_left_btn.setText("Select");
header_right_btn.setText("Clear");
registerForContextMenu(header_left_btn);
header_left_btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
openContextMenu(header_left_btn);
}
});
header_right_btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
image_list.clear();
image_drawable.clear();
deletePhotos();
updateImageTable();
}
});
}
public void deletePhotos()
{
String folder=Environment.getExternalStorageDirectory() +"/LoadImg";
File f=new File(folder);
if(f.isDirectory())
{
File[] files=f.listFiles();
Log.v("Load Image", "Total Files To Delete=====>>>>>"+files.length);
for(int i=0;i<files.length;i++)
{
String fpath=folder+File.separator+files[i].getName().toString().trim();
System.out.println("File Full Path======>>>"+fpath);
File nf=new File(fpath);
if(nf.exists())
{
nf.delete();
}
}
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo)
{
super.onCreateContextMenu(menu, v, menuInfo);
menu.setHeaderTitle("Post Image");
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.camer_menu, menu);
}
@Override
public boolean onContextItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.take_photo:
//Toast.makeText(context, "Selected Take Photo", Toast.LENGTH_SHORT).show();
takePhoto();
break;
case R.id.choose_gallery:
//Toast.makeText(context, "Selected Gallery", Toast.LENGTH_SHORT).show();
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, 1);
break;
case R.id.share_cancel:
closeContextMenu();
break;
default:
return super.onContextItemSelected(item);
}
return true;
}
public void takePhoto()
{
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
File folder = new File(Environment.getExternalStorageDirectory() + "/LoadImg");
if(!folder.exists())
{
folder.mkdir();
}
final Calendar c = Calendar.getInstance();
String new_Date= c.get(Calendar.DAY_OF_MONTH)+"-"+((c.get(Calendar.MONTH))+1) +"-"+c.get(Calendar.YEAR) +" " + c.get(Calendar.HOUR) + "-" + c.get(Calendar.MINUTE)+ "-"+ c.get(Calendar.SECOND);
path=String.format(Environment.getExternalStorageDirectory() +"/LoadImg/%s.png","LoadImg("+new_Date+")");
File photo = new File(path);
intent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(photo));
startActivityForResult(intent, 2);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==1)
{
Uri photoUri = data.getData();
if (photoUri != null)
{
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(photoUri, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filePath = cursor.getString(columnIndex);
cursor.close();
Log.v("Load Image", "Gallery File Path=====>>>"+filePath);
image_list.add(filePath);
Log.v("Load Image", "Image List Size=====>>>"+image_list.size());
//updateImageTable();
new GetImages().execute();
}
}
if(requestCode==2)
{
Log.v("Load Image", "Camera File Path=====>>>"+path);
image_list.add(path);
Log.v("Load Image", "Image List Size=====>>>"+image_list.size());
//updateImageTable();
new GetImages().execute();
}
}
public void updateImageTable()
{
image_table.removeAllViews();
if(image_drawable.size() > 0)
{
for(int i=0; i<image_drawable.size(); i++)
{
TableRow tableRow=new TableRow(this);
tableRow.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
tableRow.setGravity(Gravity.CENTER_HORIZONTAL);
tableRow.setPadding(5, 5, 5, 5);
for(int j=0; j<1; j++)
{
ImageView image=new ImageView(this);
image.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
/*Bitmap bitmap = BitmapFactory.decodeFile(image_list.get(i).toString().trim());
bitmap = Bitmap.createScaledBitmap(bitmap,500, 500, true);
Drawable d=loadImagefromurl(bitmap);*/
image.setBackgroundDrawable(image_drawable.get(i));
tableRow.addView(image, 200, 200);
}
image_table.addView(tableRow);
}
}
}
public Drawable loadImagefromurl(Bitmap icon)
{
Drawable d=new BitmapDrawable(icon);
return d;
}
public class GetImages extends AsyncTask<Void, Void, Void>
{
public ProgressDialog progDialog=null;
protected void onPreExecute()
{
progDialog=ProgressDialog.show(context, "", "Loading...",true);
}
@Override
protected Void doInBackground(Void... params)
{
image_drawable.clear();
for(int i=0; i<image_list.size(); i++)
{
Bitmap bitmap = BitmapFactory.decodeFile(image_list.get(i).toString().trim());
bitmap = Bitmap.createScaledBitmap(bitmap,500, 500, true);
Drawable d=loadImagefromurl(bitmap);
image_drawable.add(d);
}
return null;
}
protected void onPostExecute(Void result)
{
if(progDialog.isShowing())
{
progDialog.dismiss();
}
updateImageTable();
}
}
}
请参阅this