android - 获取在 xml 中声明的相对布局的大小

Question

这是我的 xml:

 <RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="match_parent"
 android:layout_height="match_parent">

<RelativeLayout 
android:layout_height="fill_parent" 
android:layout_width="fill_parent"
>

    <RelativeLayout 
    android:layout_height="wrap_content" 
    android:layout_width="fill_parent" 
    android:id="@+id/header"
    android:background="@android:color/white"
    >
        <Button 
        android:layout_height="wrap_content" 
        android:layout_width="wrap_content"
        android:id="@+id/btnBack"
        android:text="Back"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="5dp"
        />

        <ImageView 
        android:layout_height="wrap_content" 
        android:layout_width="wrap_content"
        android:src="@drawable/icon"
        android:layout_centerInParent="true"
        />

    </RelativeLayout>

    <RelativeLayout 
        android:layout_below="@+id/@+id/header"
        android:layout_height="fill_parent" 
        android:layout_width="fill_parent" 
        android:id="@+id/view" 
        android:layout_above="@+id/footer"
     >
     </RelativeLayout>

     <RelativeLayout
     android:id="@+id/footer" 
     android:layout_height="wrap_content" 
     android:layout_width="fill_parent"
     android:layout_alignParentBottom="true"    
     android:background="@android:color/white"     
     >
        <Button 
        android:layout_height="wrap_content" 
        android:layout_width="wrap_content"
        android:id="@+id/btn1"   
        android:text="btn1"
        android:layout_alignParentLeft="true"

        />

        <Button 
        android:layout_height="wrap_content" 
        android:layout_width="wrap_content"
        android:id="@+id/btn2"   
        android:text="btn2"
        android:layout_centerHorizontal="true"
        />

        <Button 
        android:layout_height="wrap_content" 
        android:layout_width="wrap_content"
        android:id="@+id/btn3"   
        android:text="btn3"
        android:layout_alignParentRight="true"
        />

     </RelativeLayout>

   </RelativeLayout>
 </RelativeLayout>

相对布局 View 介于两个布局之间。我想在我的代码中获取此相对布局的大小(即高度和宽度)。我通过使用 getWidth 和 getHeight 进行了尝试，但它显示为 0。还有其他办法吗？

Answer 1

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class AndroidResizeView extends Activity {

    TextView textMyTextView;
    Button myButton;

    RelativeLayout rlayout;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.hightk);

        rlayout = (RelativeLayout) findViewById(R.id.rlayout);

        textMyTextView = (TextView) findViewById(R.id.textView1);

        myButton = (Button) findViewById(R.id.button1);

        myButton.setOnClickListener(new Button.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                updateSizeInfo();
            }
        });
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        // TODO Auto-generated method stub
        super.onWindowFocusChanged(hasFocus);
        updateSizeInfo();
    }

    private void updateSizeInfo() {

        textMyTextView.setText(String.valueOf("Width: "
                + rlayout.getWidth() + "height ::" + rlayout.getHeight()));

    }

}