得到View的真實高度

// 標題

RelativeLayout view = (RelativeLayout) getLayoutInflater().inflate(

R.layout.webviewheader, null);

Button back = (Button) view.findViewById(R.id.btn_back);

back.setOnClickListener(new OnClickListener() {

 

@Override

public void onClick(View v) {

onBackPressed();

}

});

view.setLayoutParams(new LayoutParams(

RelativeLayout.LayoutParams.MATCH_PARENT,

RelativeLayout.LayoutParams.WRAP_CONTENT));

int w = RelativeLayout.MeasureSpec.makeMeasureSpec(0,

MeasureSpec.UNSPECIFIED);

int h = RelativeLayout.MeasureSpec.makeMeasureSpec(0,

MeasureSpec.UNSPECIFIED);

view.measure(w, h);

int x = view.getMeasuredHeight();

layout.addView(view);

若是不先設置

view.setLayoutParams(new LayoutParams(

RelativeLayout.LayoutParams.MATCH_PARENT,

RelativeLayout.LayoutParams.WRAP_CONTENT));

這句代碼調用view.measure(w, h);回報空指針