自定义控件,可以伸缩的textview

- 日理万妓 2022-08-03 12:59 151阅读 0赞

项目需求，某些textview如果超过两行，需要隐藏，右边有个图片，点击可以张开查看全部内容，也可以点击收缩。

package zivixgroup.com.skilltemp.widget;
    
    import android.content.Context;
    import android.graphics.drawable.Drawable;
    import android.text.Editable;
    import android.text.TextUtils;
    import android.text.TextWatcher;
    import android.util.AttributeSet;
    import android.view.View;
    import zivixgroup.com.skilltemp.R;
    
    /** * 可以伸展的textview * Created by george.yang on 2015/8/7. */
    public class StretchTextView extends TextView implements View.OnClickListener { 
        private int maxLines = 2;
        private boolean isSpread;//伸展状态
        private OnClickListener listener;
        private int spreadHeight;//展开时的高度
    
    
        public StretchTextView(Context context) {
            super(context);
            init(context);
        }
    
        public StretchTextView(Context context, AttributeSet attrs) {
            super(context, attrs);
            init(context);
        }
    
    
        public StretchTextView(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            init(context);
        }
    
    
        private void init (Context context) {
            setEllipsize(TextUtils.TruncateAt.END);//多余的变成...
            setMaxLines(maxLines);
    
            addTextChangedListener(new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    
                }
    
                @Override
                public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    
                }
    
                @Override
                public void afterTextChanged(Editable editable) {
                    postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            if (getLineCount() >= maxLines) {
                                setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_details_more, 0);
                            } else {
                                setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
                            }
                        }
                    }, 100);
                }
            });
    
            super.setOnClickListener(this);
        }
    
    
        @Override
        public void setOnClickListener(OnClickListener l) {
            listener = l;
        }
    
    
        @Override
        public void onClick(View view) {
            if (getLineCount()<maxLines) {
                return;
            }
    
            isSpread = !isSpread;
            if (isSpread) {
                this.setMaxLines(Integer.MAX_VALUE);
                this.requestLayout();
    
                if (spreadHeight==0) {
                    setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_details_more, 0);
                    postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            spreadHeight = getMeasuredHeight();
                            resetDrawable();
                        }
                    },100);
                } else {
                    resetDrawable();
                }
            } else  {
                this.setMaxLines(maxLines);
                this.requestLayout();
    
                spreadHeight = getMeasuredHeight();
    
                setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_details_more, 0);
            }
    
            if (listener!=null) {
                listener.onClick(view);
            }
        }
    
        private void resetDrawable() {
            Drawable drawable = getResources().getDrawable(R.drawable.ic_shrink_up);
            drawable.setBounds(0, spreadHeight/2-drawable.getIntrinsicHeight()/2, drawable.getIntrinsicWidth(),spreadHeight/2+drawable.getIntrinsicHeight()/2);
            setCompoundDrawables(null, null, drawable, null);
        }
    }

ic\_shrink\_up  
![ic\_shrink\_up][ic_shrink_up]

ic\_details\_more  
![ic\_details\_more][ic_details_more]

[ic_shrink_up]: /images/20220731/7e41a5cc4f6d41459c28ec9fb0d70989.png
[ic_details_more]: /images/20220731/f7dc5cf55a774520b8af44eae2432a98.png