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मुझे stackoverflow पर कस्टम लाइनरलायआउट का यह उदाहरण मिला, लेकिन जब मैं इसे चलाने का प्रयास करता हूं तो यह त्रुटियों को फेंकता है, क्या कोई इसे ढूंढ सकता है?एक्सएमएल को पार्स करने में त्रुटि: कस्टम लाइनरलाइट पर अनबाउंड उपसर्ग
कस्टम LinearLayout:
package com.example.androidapp.widgets;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.LinearLayout;
public class ExpandablePanel extends LinearLayout {
private final int mHandleId;
private final int mContentId;
private View mHandle;
private View mContent;
private boolean mExpanded = true;
private int mCollapsedHeight = 0;
private int mContentHeight = 0;
public ExpandablePanel(Context context) {
this(context, null);
}
public ExpandablePanel(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.ExpandablePanel, 0, 0);
// How high the content should be in "collapsed" state
mCollapsedHeight = (int) a.getDimension(
R.styleable.ExpandablePanel_collapsedHeight, 0.0f);
int handleId = a.getResourceId(R.styleable.ExpandablePanel_handle, 0);
if (handleId == 0) {
throw new IllegalArgumentException(
"The handle attribute is required and must refer "
+ "to a valid child.");
}
int contentId = a.getResourceId(R.styleable.ExpandablePanel_content, 0);
if (contentId == 0) {
throw new IllegalArgumentException(
"The content attribute is required and must refer "
+ "to a valid child.");
}
mHandleId = handleId;
mContentId = contentId;
a.recycle();
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mHandle = findViewById(mHandleId);
if (mHandle == null) {
throw new IllegalArgumentException(
"The handle attribute is must refer to an"
+ " existing child.");
}
mContent = findViewById(mContentId);
if (mContent == null) {
throw new IllegalArgumentException(
"The content attribute is must refer to an"
+ " existing child.");
}
mHandle.setOnClickListener(new PanelToggler());
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mContentHeight == 0) {
// First, measure how high content wants to be
mContent.measure(widthMeasureSpec, MeasureSpec.UNSPECIFIED);
mContentHeight = mContent.getMeasuredHeight();
}
// Then let the usual thing happen
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
private class PanelToggler implements OnClickListener {
@Override
public void onClick(View v) {
Animation a;
if (mExpanded) {
a = new ExpandAnimation(mContentHeight, mCollapsedHeight);
} else {
a = new ExpandAnimation(mCollapsedHeight, mContentHeight);
}
a.setDuration(500);
mContent.startAnimation(a);
mExpanded = !mExpanded;
}
}
private class ExpandAnimation extends Animation {
private final int mStartHeight;
private final int mDeltaHeight;
public ExpandAnimation(int startHeight, int endHeight) {
mStartHeight = startHeight;
mDeltaHeight = endHeight - startHeight;
}
@Override
protected void applyTransformation(float interpolatedTime,
Transformation t) {
android.view.ViewGroup.LayoutParams lp = mContent.getLayoutParams();
lp.height = (int) (mStartHeight + mDeltaHeight * interpolatedTime);
mContent.setLayoutParams(lp);
}
@Override
public boolean willChangeBounds() {
// TODO Auto-generated method stub
return true;
}
}
}
रेस> मान> attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="ExpandablePanel">
<attr name="handle" format="reference" />
<attr name="content" format="reference" />
<attr name="collapsedHeight" format="dimension" />
</declare-styleable>
</resources>
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:cl="http://schemas.android.com/apk/lib/com.example.androidapp.widgets"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<com.example.androidapp.widgets.ExpandablePanel
android:orientation="vertical"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
cl:handle="@+id/expand"
cl:content="@+id/value"
cl:collapsedHeight="50dip">
<TextView
android:id="@id/value"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:maxHeight="50dip"
/>
<Button
android:id="@id/expand"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="More" />
</com.example.androidapp.widgets.ExpandablePanel>
</LinearLayout>
गतिविधि वर्ग:
package com.example.androidapp.widgets;
import android.app.Activity;
import android.os.Bundle;
public class GoodPanelsActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
LogCat त्रुटि:
FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.androidapp.widgets/com.example.androidapp.widgets.GoodPanelsActivity}: android.view.InflateException: Binary XML file line #9: Error inflating class com.example.androidapp.widgets.ExpandablePanel
संपादित करें: LogCat से
java.lang.reflect.InvocationTargetException at java.lang.reflect.Constructor.constructNative(Native Method) at java.lang.reflect.Constructor.newInstance(Constructor.java:415) at android.view.LayoutInflater.createView(LayoutInflater.java:505) Caused by: java.lang.IllegalArgumentException: The handle attribute is required and must refer to a valid child. at com.example.androidapp.widgets.ExpandablePanel.(ExpandablePanel.java:39)
स्वीकार करें कि आप इसे उत्तर देते हैं, भले ही आपने इसे पोस्ट किया हो, –
धन्यवाद, मुझे इसे स्वीकार करने की अनुमति नहीं देने के बाद, 20 घंटे बाद इसे स्वीकार कर लिया जाएगा –