问题
I have found the following code on how to get display height and width from ImageView: Trying to get the display size of an image in an ImageView . When I try to use it in the layout snippet below, I get following error.
<com.mycompany.widget.SizeAwareImageView
android:id="@+id/account_profile_img"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="@drawable/avatar"
android:clickable="true"
android:gravity="bottom|center_horizontal"
android:onClick="onEditPhotoClicked" />
ERROR:
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.company.myapp/com.company.myapp.RegisterActivity}: android.view.InflateException: Binary XML file line #218: Error inflating class com.company.myapp.widget.SizeAwareImageView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2247)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
at android.app.ActivityThread.access$700(ActivityThread.java:152)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5328)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #218: Error inflating class com.company.myapp.widget.SizeAwareImageView
at android.view.LayoutInflater.createView(LayoutInflater.java:602)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:693)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:760)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:760)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:760)
at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:327)
at android.app.Activity.setContentView(Activity.java:1928)
at com.company.myapp.RegisterActivity.onCreate(RegisterActivity.java:63)
at android.app.Activity.performCreate(Activity.java:5250)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
... 11 more
Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
at java.lang.Class.getConstructorOrMethod(Class.java:460)
at java.lang.Class.getConstructor(Class.java:431)
at android.view.LayoutInflater.createView(LayoutInflater.java:567)
... 25 more
UPDATE
From the graphics Layout I also get the error
java.lang.NullPointerException
Exception details are logged in Window > Show View > Error Log
java.lang.NullPointerException
at com.company.myapp.widget.SizeAwareImageView.onMeasure(SizeAwareImageView.java:66)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15848)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
at android.view.View.measure(View.java:15848)
at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1217)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.widget.ScrollView.onMeasure(ScrollView.java:321)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5008)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15848)
SECOND UPDATE
the errored line in question is the second of
final Drawable d = getDrawable();
final int origW = d.getIntrinsicWidth();
final int origH = d.getIntrinsicHeight();
The complete code is here on stack overflow at Trying to get the display size of an image in an ImageView . It's the response with the most votes.
回答1:
Make sure you have provided the right constructor for the XML. Your custom Views constructor should have the following method signature:
public SizeAwareImageView(Context context, AttributeSet attrs){
// todo
}
I'm guessing it currently looks like this:
public SizeAwareImageView(Context context){
// todo
}
Also I'd double check you meant to set the XML parameter android:background, for ImageView you actually set android:src.
来源：https://stackoverflow.com/questions/18624819/how-to-use-custom-imageview