Android解决获取控件Width和Height为0的问题

Android在onCreate方法中调用View的getWidth和getHeight时返回的结果是0，因为此时控件还没有Draw出来，所以长和宽都是0。

如果想得到Width和Height，可以对View进行监听：

首先需要重写View的onSizeChange方法，加入监听回调函数：

public class MyTextView extends TextView {

public MyTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}

public MyTextView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}

public MyTextView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}

SizeChangeListener l;

public void setSizeChangeListener(SizeChangeListener orlExt) {
l = orlExt;
}

@Override
public void onSizeChanged(int w, int h, int oldw,  int oldh) {
// TODO Auto-generated method stub
l.sizeChanged(w, h, oldw, oldh);
super.onSizeChanged(w, h, oldw, oldh);
}

public interface SizeChangeListener {
public void sizeChanged(int w, int h, int oldw,  int oldh);
}
}

public class MyTextView extends TextView {

	public MyTextView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		// TODO Auto-generated constructor stub
	}

	public MyTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
	}

	public MyTextView(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
	}

	SizeChangeListener l;

	public void setSizeChangeListener(SizeChangeListener orlExt) {
		l = orlExt;
	}

	@Override
	public void onSizeChanged(int w, int h, int oldw, int oldh) {
		// TODO Auto-generated method stub
		l.sizeChanged(w, h, oldw, oldh);
		super.onSizeChanged(w, h, oldw, oldh);
	}

	public interface SizeChangeListener {
		public void sizeChanged(int w, int h, int oldw, int oldh);
	}
}

然后在Activity中对View设置监听器：

tv_front = new MyTextView(this);
tv_front.setBackgroundResource(R.drawable.slidebar);
tv_front.setTextColor(Color.BLACK);
tv_front.setText("要闻");
tv_front.setGravity(Gravity.CENTER);
tv_front.setTextSize(16);
//监听textview尺寸改变
tv_front.setSizeChangeListener(new SizeChangeListener() {

@Override
public void sizeChanged(int w, int h, int oldw,  int oldh) {
// TODO Auto-generated method stub
// 这里能获取真实的高和宽
}
});

		tv_front = new MyTextView(this);
		tv_front.setBackgroundResource(R.drawable.slidebar);
		tv_front.setTextColor(Color.BLACK);
		tv_front.setText("要闻");
		tv_front.setGravity(Gravity.CENTER);
		tv_front.setTextSize(16);
		//监听textview尺寸改变
		tv_front.setSizeChangeListener(new SizeChangeListener() {
			
			@Override
			public void sizeChanged(int w, int h, int oldw, int oldh) {
				// TODO Auto-generated method stub
	                       // 这里能获取真实的高和宽
			}
		});

转载于:https://www.cnblogs.com/shhaoran/archive/2013/02/07/2924504.html