我目前正在设计一款Android应用程序，该应用程序在某个时刻需要用户从相机或手机的图库中选择图片。之后，我需要在活动的图像视图中显示所述图片。
我认为获取图片的代码部分没问题，因为我可以从两个选项中有效地选择照片。但在此之后，除了没有显示图片外，图像视图的src徽标消失了。我不明白我做错了什么或者这里有什么东西丢失了，因为这是一个非致命的错误，应用程序继续执行。
所以这是我的活动的XML布局：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.LinearLayoutCompat
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"
style="@style/Widget.Design.CoordinatorLayout"
android:orientation="vertical"
tools:context="pt.unl.fct.di.www.myapplication.ReportActivity">
<ScrollView
android:id="@+id/report_form"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/submit_report_form"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1">
<TextView
android:id="@+id/type_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="30dp"
android:text="@string/select_report_type"
android:visibility="visible" />
<Spinner
android:id="@+id/report_type_spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="3"
android:layout_marginBottom="30dp"/>
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/description"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:hint="Description"
android:inputType="textMultiLine"
android:selectAllOnFocus="false"
android:layout_marginBottom="30dp"/>
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="3">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Location"
android:layout_marginBottom="30dp"/>
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Map"
android:layout_marginBottom="30dp"/>
</android.support.design.widget.TextInputLayout>
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="200dp"
android:src="@android:drawable/ic_menu_camera"
android:adjustViewBounds="true"
/>
<Button
android:id="@+id/camera_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Add Picture" />
<Button
android:id="@+id/submit_report_button"
style="?android:textAppearanceSmall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="@string/action_submit_report"
android:textStyle="bold"
android:layout_weight="0.68" />
</LinearLayout>
</ScrollView>
活动的java（重要的东西）：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_report);
Spinner spinner = (Spinner) findViewById(R.id.report_type_spinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.report_types, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
mReportType = spinner.getItemAtPosition(0).toString();
spinner.setOnItemSelectedListener(this);
mDescription = (EditText)findViewById(R.id.description);
mImageLocationView =(ImageView) findViewById(R.id.imageView);
Button cameraButton = (Button)findViewById(R.id.camera_button);
cameraButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setTitle(R.string.choose_photo_from)
.setItems(R.array.picture_types, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// The 'which' argument contains the index position
// of the selected item
switch(which){
case 0: //fotografia
Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(takePicture, 0);
onPause();
//zero can be replaced with any action code
break;
case 1:
//galeria
Intent pickPhoto = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(pickPhoto , 1);
//one can be replaced with any action code
break;
}
}
});
builder.create().show();
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
BitmapFactory.Options o = new BitmapFactory.Options();
mImageLocationView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
switch(requestCode) {
case 0:
if(resultCode == RESULT_OK){
Bitmap photo = (Bitmap) imageReturnedIntent.getExtras().get("data");
mImageLocationView.setImageBitmap(photo);
}
break;
case 1:
if(resultCode == RESULT_OK){
Bitmap photo = (Bitmap) imageReturnedIntent.getExtras().get("data");
mImageLocationView.setImageBitmap(photo);
}
break;
}
}
我必须说，这是我的第一个Android项目，所以我对这么多的信息和APIS感到不知所措，并且做了大量的实验。
答案 0 :(得分：0)
只需在`
中添加以下代码即可if(resultCode == RESULT_OK){
// the new code
Uri imageUri = data.getData();
String[] filePath = { MediaStore.Images.Media.DATA };
Cursor cursor = getActivity().getContentResolver().query(imageUri, filePath, null, null, null);
cursor.moveToFirst();
String path = cursor.getString(cursor.getColumnIndex(filePath[0]));
cursor.close();
//refresh Image view
updateImageView(path);
}
// the update image method
public void updateImageView(String completePath) {
Picasso picasoo = Picasso.with(getActivity());
String path = "file://" + completePath;
Long tsLong = System.currentTimeMillis();
String ts = tsLong.toString();
picasoo.load(path+"?time="+ts).fit().centerCrop().networkPolicy(OFFLINE).into(imgUserProfile);
}` Picasso是一个图像管理库，可以通过延迟加载图像来简化您的生活。