getMeasuredWidth在源码中的解释如下：
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/**
* Like {@link #getMeasuredWidthAndState()}, but only returns the
* raw width component (that is the result is masked by
* {@link #MEASURED_SIZE_MASK}).
*
* @return The raw measured width of this view.
*/
public final int getMeasuredWidth() {
return mMeasuredWidth & MEASURED_SIZE_MASK;
}
/**
* Return the full width measurement information for this view as computed
* by the most recent call to {@link #measure(int, int)}. This result is a bit mask
* as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
* This should be used during measurement and layout calculations only. Use
* {@link #getWidth()} to see how wide a view is after layout.
*
* @return The measured width of this view as a bit mask.
*/
public final int getMeasuredWidthAndState() {
return mMeasuredWidth;
}
大致意思也就是说返回最后一次调用onMeasure所测量得到的宽度。
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getWidth在源码中返回View的宽度 单位是pixels
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/**
* Return the width of the your view.
*
* @return The width of your view, in pixels.
*/
@ViewDebug.ExportedProperty(category = layout)
public final int getWidth() {
return mRight - mLeft;
}
写一个Demo测试一下 代码如下：
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public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
MLinearLayout root = new MLinearLayout(this);
setContentView(root);
}
class MLinearLayout extends LinearLayout
{
public MLinearLayout(Context context)
{
super(context);
setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.MATCH_PARENT));
addView(new MTextView(context));
Log.i(AAA,LinearLayout MLinearLayout Width:+getWidth() + Height:+getHeight());
Log.i(AAA,LinearLayout MLinearLayout MeasuredWidth:+getMeasuredWidth() + MeasuredHeight:+getMeasuredHeight());
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
Log.i(AAA,LinearLayout onMeasure Width:+getWidth() + Height:+getHeight());
Log.i(AAA,LinearLayout onMeasure MeasuredWidth:+getMeasuredWidth() + MeasuredHeight:+getMeasuredHeight());
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// TODO Auto-generated method stub
super.onLayout(changed, l, t, r, b);
Log.i(AAA,LinearLayout onLayout Width:+getWidth() + Height:+getHeight());
Log.i(AAA,LinearLayout onLayout MeasuredWidth:+getMeasuredWidth() + MeasuredHeight:+getMeasuredHeight());
}
}
class MTextView extends TextView
{
public MTextView(Context context) {
super(context);
setLayoutParams(new LayoutParams(200, 300));
setText(测试);
Log.i(AAA, TextView MTextView Width:+getWidth() + Height:+getHeight());
Log.i(AAA, TextView MTextView MeasuredWidth:+getMeasuredWidth() + MeasuredHeight:+getMeasuredHeight());
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
Log.i(AAA, TextView onMeasure Width:+getWidth() + Height:+getHeight());
Log.i(AAA, TextView onMeasure MeasuredWidth:+getMeasuredWidth() + MeasuredHeight:+getMeasuredHeight());
}