支援富文本插入圖檔，文本的自定義Ｖiew

在比較潮流的Ａpp中，我們經常看到富文本的身影，能支援圖文混排，其實圖文混排不是那麼難，這段時間由于項目的需要，我自己實作了圖文混排，即能支援插入圖排，又可以編輯文本。其實原理很簡單，把ＩmageView跟ＥditText動态加入一個layout容器裡面，然後根據最近的焦點來添加view，具體請看我的view，裡面已經注釋很清楚了。

public class RichTextView extends ScrollView {
    private static final int EDIT_PADDING = ; // edittext正常padding是10dp

    private int viewTagIndex = ; // 新生的view都會打一個tag，對每個view來說，這個tag是唯一的。
    private LinearLayout allLayout; // 這個是所有子view的容器，scrollView内部的唯一一個ViewGroup
    private LayoutInflater inflater;
    private int editNormalPadding = ; //

    public RichTextView(Context context) {
        this(context, null);
    }

    public RichTextView(Context context, AttributeSet attrs) {
        this(context, attrs, );
    }

    public RichTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        inflater = LayoutInflater.from(context);

        // 1. 初始化allLayout
        allLayout = new LinearLayout(context);
        allLayout.setOrientation(LinearLayout.VERTICAL);
        //allLayout.setBackgroundColor(Color.WHITE);//去掉背景
        LayoutParams layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT,
                LayoutParams.WRAP_CONTENT);
        allLayout.setPadding(,,,);//設定間距，防止生成圖檔時文字太靠邊
        addView(allLayout, layoutParams);

        LinearLayout.LayoutParams firstEditParam = new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
        //editNormalPadding = dip2px(EDIT_PADDING);
        TextView firstText = createTextView("沒有内容", dip2px(context, EDIT_PADDING));
        allLayout.addView(firstText, firstEditParam);
    }

    public int dip2px(Context context, float dipValue) {
        float m = context.getResources().getDisplayMetrics().density;
        return (int) (dipValue * m + f);
    }

    /**
     * 清除所有的view
     */
    public void clearAllLayout(){
        allLayout.removeAllViews();
    }

    /**
     * 獲得最後一個子view的位置
     * @return
     */
    public int getLastIndex(){
        int lastEditIndex = allLayout.getChildCount();
        return lastEditIndex;
    }

    /**
     * 生成文本輸入框
     */
    public TextView createTextView(String hint, int paddingTop) {
        TextView textView = (TextView) inflater.inflate(R.layout.rich_textview, null);
        textView.setTag(viewTagIndex++);
        textView.setPadding(editNormalPadding, paddingTop, editNormalPadding, paddingTop);
        textView.setHint(hint);
        return textView;
    }

    /**
     * 生成圖檔View
     */
    private RelativeLayout createImageLayout() {
        RelativeLayout layout = (RelativeLayout) inflater.inflate(
                R.layout.edit_imageview, null);
        layout.setTag(viewTagIndex++);
        View closeView = layout.findViewById(R.id.image_close);
        closeView.setVisibility(GONE);
        return layout;
    }

    /**
     * 在特定位置插入EditText
     *
     * @param index
     *            位置
     * @param editStr
     *            EditText顯示的文字
     */
    public void addTextViewAtIndex(final int index, CharSequence editStr) {
        TextView textView = createTextView("", EDIT_PADDING);
        textView.setText(editStr);

        allLayout.addView(textView, index);
    }

    /**
     * 在特定位置添加ImageView
     */
    public void addImageViewAtIndex(final int index, String imagePath) {
        Bitmap bmp = BitmapFactory.decodeFile(imagePath);

        final RelativeLayout imageLayout = createImageLayout();
        DataImageView imageView = (DataImageView) imageLayout.findViewById(R.id.edit_imageView);
        Glide.with(getContext()).load(imagePath).crossFade().centerCrop().into(imageView);
        //imageView.setImageBitmap(bmp);//這裡改用Glide加載圖檔
        //imageView.setBitmap(bmp);//這句去掉，保留下面的圖檔位址即可，優化圖檔占用
        imageView.setAbsolutePath(imagePath);

        // 調整imageView的高度
        int imageHeight = allLayout.getWidth() * bmp.getHeight() / bmp.getWidth();
        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, imageHeight);
        lp.bottomMargin = ;
        imageView.setLayoutParams(lp);

        allLayout.addView(imageLayout, index);
    }

    /**
     * 根據view的寬度，動态縮放bitmap尺寸
     *
     * @param width
     *            view的寬度
     */
    public Bitmap getScaledBitmap(String filePath, int width) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, options);
        int sampleSize = options.outWidth > width ? options.outWidth / width
                +  : ;
        options.inJustDecodeBounds = false;
        options.inSampleSize = sampleSize;
        return BitmapFactory.decodeFile(filePath, options);
    }

}