listview计算高度是的奇异问题

在这里介绍的是当listview的item有过多textview时，计算listview高度不准确的问题。因为textview的边距以及行高问题，导致计算高度时不准确。这时候需要重写textview才能解决这个问题。

public class TextViewMeasure extends TextView {    public TextViewMeasure(Context context) {        super(context);    }    public TextViewMeasure(Context context, AttributeSet attrs) {        super(context, attrs);    }    public TextViewMeasure(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        Layout layout = getLayout();        if (layout != null) {            int height = (int) FloatMath.ceil(getMaxLineHeight(this.getText().toString()))                    + getCompoundPaddingTop() + getCompoundPaddingBottom();            int width = getMeasuredWidth();            setMeasuredDimension(width, height);        }    }    private float getMaxLineHeight(String str) {        float height = 0.0f;        float screenW = ((Activity) getContext()).getWindowManager().getDefaultDisplay().getWidth();        float paddingLeft = 0;        float paddingReft = 0;        if (this.getParent() instanceof  RelativeLayout){            paddingLeft = ((RelativeLayout) this.getParent()).getPaddingLeft();            paddingReft = ((RelativeLayout) this.getParent()).getPaddingRight();        }else if (this.getParent() instanceof LinearLayout){            paddingLeft = ((LinearLayout) this.getParent()).getPaddingLeft();            paddingReft = ((LinearLayout) this.getParent()).getPaddingRight();        }        //这里具体this.getPaint()要注意使用，要看你的TextView在什么位置，这个是拿TextView父控件的Padding的，为了更准确的算出换行        int line = (int) Math.ceil((this.getPaint().measureText(str) / (screenW - paddingLeft - paddingReft)));        height = (this.getPaint().getFontMetrics().descent - this.getPaint().getFontMetrics().ascent) * line;        return height;    }}

当listview中的textview都替换为TextViewMeasure时，即可使用下面方法获取listview高度。

public static int getTotalHeightofListView(ListView listView) {        ListAdapter mAdapter = listView.getAdapter();        if (mAdapter == null) {            return 0;        }        int totalHeight = 0;        for (int i = 0; i < mAdapter.getCount(); i++) {            View mView = mAdapter.getView(i, null, listView);            mView.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),                    View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));            totalHeight += mView.getMeasuredHeight();        }        ViewGroup.LayoutParams params = listView.getLayoutParams();        params.height = totalHeight + (listView.getDividerHeight() * (mAdapter.getCount() - 1));        listView.setLayoutParams(params);        listView.requestLayout();        return params.height;    }