怎么在Activity中获取指定控件的宽高_kotlin textview如何获取控件高度,宽度-优快云博客

本文链接：https://blog.youkuaiyun.com/cenzr/article/details/51222932

本文介绍了两种在Android Activity中获取指定视图控件宽高的方法，包括直接获取和在视图布局完成后再获取，适用于动态计算布局的需求。

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第一种方法：

TextView<span style="font-family: Arial, Helvetica, sans-serif;">=new TextView(this);</span>
textview.getViewTreeObserver().addOnGlobalLayoutListener(new onGlobalLayoutListener(){
   public void onGlobalLayout(){
      textview.getViewTreeObserver().removeGlobalOnLayoutListener(this);
      textview.getHeight();
      textview.getWidght();
}

})

第二种方法：

textview.post(new Runnable{

   public void run(){

        textview.getHeight();
}

})

下面是全部代码：

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;
import android.widget.TextView;

public class TestLPActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_lp);
        final TextView tv = (TextView) findViewById(R.id.tv);

//        LayoutParams layoutParams = (LayoutParams) tv.getLayoutParams();
//        layoutParams.height = 200;
//        layoutParams.width = 200;
//        tv.setLayoutParams(layoutParams);
//        System.out.println("layoutParams.height:" + layoutParams.height + "layoutParams.width:"
//                + layoutParams.width);
//        tv.measure(0, 0);
//        int measuredHeight = tv.getMeasuredHeight();
//        int measuredWidth = tv.getMeasuredWidth();
//        System.out.println("measuredHeight:" + measuredHeight + "measuredWidth:" + measuredWidth);
//        tv.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
//            @Override
//            public void onGlobalLayout() {
//                // 结论: 如果布局文件里宽高配置 match_parent, wrap_content, LayoutParams就是 -1, -2.
//                // 无论什么时候都是
//                System.out.println(tv.getHeight());
//                System.out.println(tv.getLayoutParams().width+" "+tv.getLayoutParams().height);
//                RelativeLayout.LayoutParams lp = (LayoutParams) tv.getLayoutParams();
//                lp.height = 500;
//                tv.setLayoutParams(lp);
//                System.out.println(tv.getLayoutParams().width+" "+tv.getLayoutParams().height);
//                tv.getViewTreeObserver().removeGlobalOnLayoutListener(this);
//            }
//        });
        tv.post(new Runnable() {
            @Override
            public void run() {
                System.out.println(tv.getHeight());
                System.out.println(tv.getLayoutParams().width+" "+tv.getLayoutParams().height);
                RelativeLayout.LayoutParams lp = (LayoutParams) tv.getLayoutParams();
                lp.height = 500;
                tv.setLayoutParams(lp);
                System.out.println(tv.getLayoutParams().width+" "+tv.getLayoutParams().height);
            }
        });
    }
}