【Android】获取控件的宽和高

有时候我们需要在Activity的时候获取控件的宽和高来做一些操作，下面介绍三种获取宽和高的方式：

1. onWindowFocusChanged

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<code class="hljs java">@Override

    public void onWindowFocusChanged(boolean hasFocus)

    {

        super.onWindowFocusChanged(hasFocus);

        if (hasFocus)

        {

            int width = image.getMeasuredWidth();

            int height = image.getMeasuredHeight();

            Toast.makeText(MainActivity.this, "width = " + width + "---height = " + height, Toast.LENGTH_SHORT).show();

        }

 

    }</code>

2. post方式

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<code class="hljs java"> @Override

    protected void onStart()

    {

        super.onStart();

 

        image.post(new Runnable()

        {

 

            @Override

            public void run()

            {

                int width = image.getMeasuredWidth();

                int height = image.getMeasuredHeight();

                Toast.makeText(MainActivity.this, "onstart--width = " + width + "---height = " + height, Toast.LENGTH_SHORT).show();

            }

        });

    }</code>

3. ViewTreeObserver

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<code class="hljs java"> ViewTreeObserver observer = image.getViewTreeObserver();

        observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener()

        {

 

            @Override

            public void onGlobalLayout()

            {

                image.getViewTreeObserver().removeGlobalOnLayoutListener(this);

                int width = image.getMeasuredWidth();

                int height = image.getMeasuredHeight();

                Toast.makeText(MainActivity.this, "onglobal--width = " + width + "---height = " + height, Toast.LENGTH_SHORT).show();

            }

        });</code>

 

备注：以上image是ImageView控件

ImageView image = (ImageView)findViewById(R.id.image);