尝试在android中使用自定义imageview(topcrop),但该应用程序停止了 [英] Trying to use custom imageview (topcrop) in android, but the the app stops
问题描述
我发现了以下帖子如何将imageview比例类型设置为topCrop >
基于此,我使用了 https://gist.github.com/arriolac/3843346 扩展了ImageView
以下是我的布局xml文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<com.simha.quotes.TopCropImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView23"
android:src="@drawable/background" />
<TextView
android:layout_width="wrap_content"
android:layout_height="100dp"
android:text="New Text"
android:id="@+id/textView23"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="33dp"
android:layout_marginLeft="30dp"
android:layout_marginStart="50dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textColor="#ffffff"
android:textSize="14sp"
android:textStyle="bold"
android:shadowColor="#000000"
android:shadowDx="4"
android:shadowDy="4"
android:shadowRadius="4" />
</RelativeLayout>
gradle编译没有任何错误.但是,当我使用该应用程序时,以及当我谈到使用上述布局时.它不再说不幸的是该应用程序停止了"之类的话.
是否有任何遗漏或错误方法.
我找到了解决方案:How set imageview scaletype to topCrop
Based on that i used the class TopCropImageView from https://gist.github.com/arriolac/3843346 which extends ImageView
The following is my layout xml file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<com.simha.quotes.TopCropImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView23"
android:src="@drawable/background" />
<TextView
android:layout_width="wrap_content"
android:layout_height="100dp"
android:text="New Text"
android:id="@+id/textView23"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="33dp"
android:layout_marginLeft="30dp"
android:layout_marginStart="50dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textColor="#ffffff"
android:textSize="14sp"
android:textStyle="bold"
android:shadowColor="#000000"
android:shadowDx="4"
android:shadowDy="4"
android:shadowRadius="4" />
</RelativeLayout>
The gradle compiles without any errors. But when i use the app, and when i come to the point of using the above layout. it stops saying something like "the app as to stop unfortunately."
Is there anything which is missing or has a wrong approach.
i found the solution: .java not using the 2- or 3-argument View constructors; XML attributes will not work added these to the code of TopCropImageView then it worked.
public TopCropImageView(Context context, AttributeSet attrs) {
super(context, attrs);
setScaleType(ScaleType.MATRIX);
}
public TopCropImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setScaleType(ScaleType.MATRIX);
}
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