getHeight는 모든 Android UI 개체에 대해 0을 반환합니다.

getHeight는 모든 Android UI 개체에 대해 0을 반환합니다.

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저는 UI를 만들고 있는데 모두 XML에 정적으로 정의되어 있습니다. 이 모든 것들은 사방에 가중치를 가지고 있고,보기에는 좋게 보이지만 실제로 모든 것이 올바른 높이를 가지고 있는지보고 싶었습니다. 문제는 형식 레이아웃에 대해 .getHeight ()를 호출하는 위치에 관계없이 0을 얻었습니다. onCreate () 및 onStart () 모두에서 시도했습니다. 같은 것. 모든 UI 개체에도 발생합니다. 어떤 생각?

package com.app.conekta;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;

public class Conekta extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

    }

    @Override
    public void onStart() {

        super.onStart();


    }

    @Override
    public void onResume() {
        super.onResume();

        FrameLayout fl1 = (FrameLayout) findViewById(R.id.headerFrameLayout);
        FrameLayout fl2 = (FrameLayout) findViewById(R.id.footerFrameLayout);
        Button b=(Button) findViewById(R.id.searchButton);

        Log.d("CONEKTA", String.valueOf(b.getHeight()));

    }
}

XML :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >



    <FrameLayout
        android:id="@+id/headerFrameLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.05"
        android:background="#597eAA" >

        <ImageView
            android:id="@+id/logoImage"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="#7ba1d1"
            android:src="@drawable/logo_conekta" />
    </FrameLayout>

    <LinearLayout
        android:id="@+id/bodyLinearLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.7"
        android:background="#f3f3f3"
        android:orientation="horizontal" >

        <FrameLayout
            android:id="@+id/leftBlankFrameLayout"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.15"
            android:background="#f3f3f3" >
        </FrameLayout>

        <LinearLayout
            android:id="@+id/centerVerticalLayout"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.7"
            android:orientation="vertical" >

            <FrameLayout
                android:id="@+id/topCenterFrameLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.35" >
            </FrameLayout>

            <TextView
                android:id="@+id/venueLabel"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.025"
                android:text="What are you looking for?"
                android:textAppearance="?android:attr/textAppearanceMedium"
                android:textColor="#000000" />

            <EditText
                android:id="@+id/venueTextField"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.025" >

                <requestFocus />
            </EditText>

            <FrameLayout
                android:id="@+id/middleCenterFrameLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.05" >
            </FrameLayout>

            <TextView
                android:id="@+id/locationLabel"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.025"
                android:text="Where?"
                android:textAppearance="?android:attr/textAppearanceMedium"
                android:textColor="#000000" />

            <AutoCompleteTextView
                android:id="@+id/locationTextField"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.025"
                android:text="" />

            <LinearLayout
                android:id="@+id/buttonLinearLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.05"
                android:background="#f3f3f3"
                android:orientation="horizontal" >

                <FrameLayout
                    android:id="@+id/leftButtonLinearLayout"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="0.1" >
                </FrameLayout>

                <Button
                    android:id="@+id/searchButton"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="0.8"
                    android:background="#6fa8dc"
                    android:text="Search" />

                <FrameLayout
                    android:id="@+id/rightButtonLinearLayout"
                    android:layout_width="wrap_content"
                    android:layout_height="fill_parent"
                    android:layout_weight="0.1" >
                </FrameLayout>
            </LinearLayout>

            <FrameLayout
                android:id="@+id/bottomCenterFrameLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0.35" >
            </FrameLayout>
        </LinearLayout>

        <FrameLayout
            android:id="@+id/rightBlankFrameLayout"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="0.15"
            android:background="#f3f3f3" >
        </FrameLayout>
    </LinearLayout>

    <FrameLayout
        android:id="@+id/footerFrameLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.15"
        android:background="#7ba1d1" >
    </FrameLayout>

</LinearLayout>

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요컨대, 뷰는 아직 onCreate (), onStart () 또는 onResume ()에서 빌드되지 않았습니다. 기술적으로 존재하지 않기 때문에 (ViewGroup에 관한 한) 차원은 0입니다.

오랫동안 여기로 이동하여 처리 방법에 대한 더 나은 설명을 얻을 수 있습니다.

뷰의 차원을 검색하는 방법은 무엇입니까?

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It's 0 because in both onCreate and onStart, the view hasn't actually been drawn yet. You can get around this by listening for when the view is actually drawn:

final TextView tv = (TextView)findViewById(R.id.venueLabel);
final ViewTreeObserver observer= tv.getViewTreeObserver();
       observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
              tv.getHeight()
              observer.removeGlobalOnLayoutListener(this);
            }
        });

The call to remove the listener is there to prevent repeated invocations of your custom handler on layout changes... if you want to get those, you can omit it.

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Use this function to get Height or Width of View

private int getHeightOfView(View contentview) {
    contentview.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
    //contentview.getMeasuredWidth();
    return contentview.getMeasuredHeight();
}

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I am answering this again to make sure people like me will understand how it works completely before implementing.

Q. Why do I get my view's height as 0?
A. Because the view's height that you are trying to get is not yet built in onCreate(), onStart(), or onResume().

Q. Now where and how am I supposed to get the view's height?
A. You can still get the view's params wherever you want it like, onCreate(), onStart(), or onResume(). Like below:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

       TextView tv = (TextView)findViewById(R.id.textview1);

       ViewTreeObserver viewTreeObserver = tv.getViewTreeObserver();
       if (viewTreeObserver.isAlive()) {
        viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                viewHeight = tv.getHeight();

            }
        });
      }
   }

However this time you will wait until you get the view's height before removing observer.

tv.getViewTreeObserver().removeOnGlobalLayoutListener(this);

Q. So what should I check before removing this listener?
**A.**Just put a if condition before removing treeObserver like,

 if (viewHeight != 0)                     
 tv.getViewTreeObserver().removeOnGlobalLayoutListener(this);

Final code:

ViewTreeObserver viewTreeObserver = tv.getViewTreeObserver();
        if (viewTreeObserver.isAlive()) {
            viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                @Override
                public void onGlobalLayout() {
                    int viewHeight = tv.getHeight();
                    if (viewHeight != 0)
                        tv.getViewTreeObserver().removeOnGlobalLayoutListener(this);

                }
            });
        }

Hope this explains why the getHeight returns 0 and how to get it properly. Thanks.

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By getting your button in a View you can easily fetch its height etc. You can define an onClickListener like so:

Button b=(Button) findViewById(R.id.searchButton);
b.setOnClickListener(ButtonClick);
android.view.View.OnClickListener ButtonClick= new android.view.View.OnClickListener() {
    public void onClick(View v) { 
 v.getHeight();
}};

Hope this helps.

참고URL : https://stackoverflow.com/questions/8170915/getheight-returns-0-for-all-android-ui-objects