获取textview行数

代码

import android.content.Context;

import android.graphics.Canvas;

import android.text.Layout;

import android.text.Layout.Alignment;

import android.text.StaticLayout;

import android.text.TextUtils;

import android.util.AttributeSet;

import android.widget.TextView;

/**

 * @author jasonkent27

 *

 * TextView第二行文字超过一半则自动略去,并添加省略号

 */

public class CustomWidgetTextView extends TextView {

    private float mLineSpacingMultiplier = 1.0f;

    private float mLineAdditionalVerticalPadding = 0.0f;

    /**

     * setText时需要置为true

     */

    private boolean mNeedResetText = true ;

    public CustomWidgetTextView(Context context) {

        this(context, null);

    }

    public CustomWidgetTextView(Context context, AttributeSet attrs) {

        this(context, attrs, 0);

    }

    public CustomWidgetTextView(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

    }

    @Override

    protected final void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {

        mNeedResetText = true ;

    }

    @Override

    protected void onDraw(Canvas canvas) {

        if (mNeedResetText) {

            resetText();

            mNeedResetText = false ;

        }

        super.onDraw(canvas);

    }

    /**

     * 重TextView内部文字渲染逻辑

     */

    private void resetText() {

        if (!TextUtils.isEmpty(getText())) {

            String origText = getText().toString();

            String firstLineText ;

            String secondLineText ;

            String resultText = origText ;

            Layout layout = createRenderLayout(origText, getWidth() - getPaddingLeft() - getPaddingRight());

            if (layout.getLineCount() > 1) {

                //取出第一,二行文字

                firstLineText = origText.substring(0, layout.getLineEnd(0));

                secondLineText = origText.substring(layout.getLineEnd(0)+1, layout.getLineEnd(1));

                Layout layout2 = createRenderLayout(secondLineText, (getWidth() - getPaddingLeft() - getPaddingRight()) / 2);

                //第二行文字长度过半,则截断并且添加省略符

                if (layout2.getLineCount() > 1) {

                    secondLineText = secondLineText.substring(0, layout2.getLineEnd(0)) + "...";

                }

                resultText = firstLineText + secondLineText ;

            }

            setText(resultText);

        }

    }

    /**

     * @param workingText

     * @param width

     * @return StaticLayout @See https://developer.android.com/reference/android/text/StaticLayout.html

     */

    private Layout createRenderLayout(CharSequence workingText, int width) {

        return new StaticLayout(

                workingText,

                getPaint(),

                width,

                Alignment.ALIGN_NORMAL,

                mLineSpacingMultiplier,

                mLineAdditionalVerticalPadding,

                false );

    }

}