现在的位置: 首页 > 移动开发 > Android > 正文

Android文本排版实现

2016年05月22日 Android ⁄ 共 18238字 ⁄ 字号 暂无评论

        在项目中有一个小功能需要实现,就是对多行文本进行排版布局,每一行的内容又分为两部分,左边为标题,右边为描述,左边内容长度不确定,右边的内容需要对齐,如有换行也需要对齐右边的文本。

效果图

       效果图如下图所示:

这里写图片描述

       可以看到内容分成了两部分,左边的颜色与右边不一致,右边的描述文案统一对齐。

实现方案

       以上功能,由于输入内容输入行数不确定,并且左边的文案长度也不确定,因此不能直接在布局中实现,基于此这里主要实现了以下6种方式

方案1

       采用自定义控件的方式,继承TextView,重新onDraw函数,实现如下:


/**
 * 计算出左边最长的显示字符串maxLeftWidth,之后draw每一行字符,右边的描述从maxLeftWidth开始draw
 * 当一行显示不完全时,折行并且空出maxLeftWidth的空格长度
 */
public class TypographyView1 extends TextView {

    private Paint leftPaint = new Paint();
    private Paint rightPaint = new Paint();
    private int fullWidth;
    private float textSize;
    private JSONArray array;
    private int middlePadding = 0;
    float maxLeftWidth = 0;
    int itemSize = 0;

    public TypographyView1(Context context) {
        super(context);
        init();
    }

    public TypographyView1(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public TypographyView1(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        textSize = getResources().getDimensionPixelSize(R.dimen.text_size_13);
        leftPaint.setAntiAlias(true);
        leftPaint.setTextSize(textSize);
        leftPaint.setColor(getResources().getColor(R.color.color_black_999999));
        rightPaint.setAntiAlias(true);
        rightPaint.setTextSize(textSize);
        rightPaint.setColor(getResources().getColor(R.color.color_black));
        middlePadding = getResources().getDimensionPixelSize(R.dimen.padding_value);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        fullWidth = getWidth();// 整个textView的宽度
    }

    public void setText(JSONArray array) {
        this.array = array;
        if (array != null) {
            try {
                int size = itemSize = array.length();
                for (int i = 0; i < size; ++i) {
                    JSONArray o = (JSONArray) array.get(i);
                    String key = o.getString(0);
                    String value = o.getString(1);
                    if (TextUtils.isEmpty(key) || TextUtils.isEmpty(value)) {
                        itemSize--;
                        continue;
                    }
                    float curWidth = leftPaint.measureText(key);
                    if (curWidth > maxLeftWidth) {
                        maxLeftWidth = curWidth;
                    }
                }
                maxLeftWidth = maxLeftWidth + middlePadding;
                invalidate();
            } catch (Exception e) {

            }
        }
    }

    boolean setHeight = false;

    @Override
    protected void onDraw(Canvas canvas) {
        if (array == null) {
            return;
        }
        int lineCount = 0;
        try {
            JSONArray item;
            float offsetY;
            for (int i = 0; i < itemSize; ++i) {
                item = (JSONArray) array.get(i);
                offsetY = (lineCount + 1) * textSize;
                canvas.drawText(item.getString(0), 0, offsetY, leftPaint);

                String value = item.getString(1);
                float valueWidth = rightPaint.measureText(value);
                if (valueWidth > fullWidth - maxLeftWidth) {// 一行显示不完
                    char[] textCharArray = value.toCharArray();
                    float charWidth;
                    float drawWidth = maxLeftWidth;
                    for (int j = 0; j < textCharArray.length; j++) {
                        charWidth = rightPaint.measureText(textCharArray, j, 1);
                        if (fullWidth - drawWidth < charWidth) {
                            lineCount++;
                            drawWidth = maxLeftWidth;
                            offsetY += textSize;
                        }
                        canvas.drawText(textCharArray, j, 1, drawWidth, offsetY, rightPaint);
                        drawWidth += charWidth;
                    }
                } else {
                    canvas.drawText(value, maxLeftWidth, offsetY, rightPaint);
                }
                lineCount += 2;
            }
            if (!setHeight) {
                setHeight((lineCount + 1) * (int) textSize);
                setHeight = true;
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

       添加了setText(JSONArray array)作为数据输入,并且在这里面测量了左边title的最大宽度,之后调用invalidate触发重绘,在onSizeChanged获取整个控件的宽度,重绘会调用onDraw函数,这里不需要调用super函数,TextView的onDraw函数做了非常多的操作,解析传入的数据,分别一行一行调用canvas来进行drawText操作,当绘制描述时,先计算宽度,如果超过剩余控件说明需要换行,最后调用setHeight设置高度,这个加一个判断条件,因为会触发requestLayout()进行重新布局和invalidate()进行重绘,如果不加判断会一直重绘。

方案2

       方式2与方式1差不多,不同为所有计算都在onDraw函数中:

/**
 * 该方式与方式1很类似,只是所有的计算都放在了onDraw方法中。
 */
public class TypographyView2 extends TextView {

    private Paint paint1 = new Paint();
    private Paint paint2 = new Paint();
    private int middlePadding = 0;
    int width;
    private float textSize;
    private JSONArray array;

    public TypographyView2(Context context) {
        super(context);
        init();
    }

    public TypographyView2(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public TypographyView2(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        textSize = getResources().getDimensionPixelSize(R.dimen.text_size_13);
        paint1.setAntiAlias(true);
        paint1.setTextSize(textSize);
        paint1.setColor(getResources().getColor(R.color.color_black_999999));
        paint2.setAntiAlias(true);
        paint2.setTextSize(textSize);
        paint2.setColor(getResources().getColor(R.color.color_black));
        middlePadding = getResources().getDimensionPixelSize(R.dimen.padding_value);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        width = getWidth();// 整个textView的宽度
    }

    public void setText(JSONArray array) {
        this.array = array;
        if (array != null) {
            invalidate();
        }
    }

    boolean setHeight = false;

    @Override
    protected void onDraw(Canvas canvas) {
        // super.onDraw(canvas);
        int lineCount = 0;
        int size = array.length();
        float maxLeftWidth = 0;
        float drawWidth = 0;
        try {
            for (int i = 0; i < size; ++i) {
                JSONArray o = (JSONArray) array.get(i);
                String key = o.getString(0);
                float v = paint1.measureText(key);
                if (v > maxLeftWidth) {
                    maxLeftWidth = v;
                }
            }
            maxLeftWidth = maxLeftWidth + middlePadding;
            for (int i = 0; i < size; ++i) {
                JSONArray o = (JSONArray) array.get(i);
                String key = o.getString(0);
                canvas.drawText(key, 0, (lineCount + 1) * textSize, paint1);
                String value = o.getString(1);
                char[] textCharArray = value.toCharArray();
                float charWidth;
                drawWidth = maxLeftWidth;
                for (int j = 0; j < textCharArray.length; j++) {
                    charWidth = paint1.measureText(textCharArray, j, 1);
                    if (width - drawWidth < charWidth) {
                        lineCount++;
                        drawWidth = maxLeftWidth;
                    }
                    canvas.drawText(textCharArray, j, 1, drawWidth, (lineCount + 1) * textSize, paint2);
                    drawWidth += charWidth;
                }
                lineCount += 2;
            }
            if (!setHeight) {
                setHeight((lineCount + 1) * (int) textSize + 5);
                setHeight = true;
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

       该方案的实现是不太好的,方案1也是在此基础上进行调整的,在这里放出来只是为了说明,所有的计算不要全部放在onDraw里面,因为该方法可能会反复调用多次,这样就降低了性能。

方案3

       将数据源拼接成SpannableString,重写onDraw函数,根据内容draw每一个字符:

/**
 * 该方法,是需要显示的内容先拼接成SpannableString,在onDraw方法中获取所有的char字符,一个一个比较
 * 当为分号是,表示为key与value的分隔符。
 */
public class TypographyView3 extends TextView {

    private Paint leftPaint = new Paint();
    private Paint rightPaint = new Paint();
    int width;
    private String text;
    private float textSize;
    float maxLeftWidth = 0;
    private int middlePadding = 0;

    public TypographyView3(Context context) {
        super(context);
        init();
    }

    public TypographyView3(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public TypographyView3(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        textSize = getResources().getDimensionPixelSize(R.dimen.text_size_13);
        textSize = getResources().getDimensionPixelSize(R.dimen.text_size_13);
        leftPaint.setAntiAlias(true);
        leftPaint.setTextSize(textSize);
        leftPaint.setColor(getResources().getColor(R.color.color_black_999999));
        rightPaint.setAntiAlias(true);
        rightPaint.setTextSize(textSize);
        rightPaint.setColor(getResources().getColor(R.color.color_black));
        middlePadding = getResources().getDimensionPixelSize(R.dimen.padding_value);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        width = getWidth();// 整个textView的宽度
    }

    public void setText(JSONArray data) {
        if (data == null) {
            return;
        }
        try {
            int size = data.length();
            for (int i = 0; i < size; ++i) {
                JSONArray o = (JSONArray) data.get(i);
                String key = o.getString(0);
                float v = leftPaint.measureText(key);
                if (v > maxLeftWidth) {
                    maxLeftWidth = v;
                }
            }
            maxLeftWidth += middlePadding;
            SpannableStringBuilder ssb = new SpannableStringBuilder();
            for (int i = 0; i < size; ++i) {
                addItem((JSONArray) data.get(i), ssb, i != 0);
            }
            setText(ssb, BufferType.SPANNABLE);
        } catch (Exception e) {

        }
    }

    private void addItem(JSONArray item, SpannableStringBuilder ssb, boolean breakLine) {
        try {
            if (item == null || item.length() == 0) {
                return;
            }
            String key = item.getString(0);
            String value = (item.length() >= 2) ? item.getString(1) : "";
            if (TextUtils.isEmpty(key) && TextUtils.isEmpty(value)) {
                return;
            }
            if (breakLine) {// 换行
                ssb.append("\r\n");
                ssb.append("\r\n");
            }
            SpannableString span = new SpannableString(key);
            //            span.setSpan(new ForegroundColorSpan(getResources().getColor(R.color.colorAccent)), 0, key
            // .length(),
            //                    Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
            ssb.append(span);
            ssb.append(value);

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // super.onDraw(canvas);
        int lineCount = 0;
        text = this.getText().toString();
        if (text == null)
            return;
        char[] textCharArray = text.toCharArray();
        // 已绘的宽度
        float drawWidth = 0;
        float charWidth;
        Paint paint = leftPaint;
        for (int i = 0; i < textCharArray.length; i++) {
            charWidth = leftPaint.measureText(textCharArray, i, 1);

            if (textCharArray[i] == '\n') {
                lineCount++;
                drawWidth = 0;
                paint = leftPaint;
                continue;
            }
            if (width - drawWidth < charWidth) {
                lineCount++;
                drawWidth = maxLeftWidth;
            }
            if (i > 1 && textCharArray[i - 1] == ':') {
                drawWidth = maxLeftWidth;
                paint = rightPaint;
            }
            canvas.drawText(textCharArray, i, 1, drawWidth, (lineCount + 1) * textSize, paint);
            drawWidth += charWidth;
        }
        //may be need set height
        //setHeight((lineCount + 1) * (int) textSize + 5);
    }
}

       这里先计算左边title的最大宽度,同时将所有的数据拼接成一个SpannableStringBuilder,调用setText函数会触发重绘,在onDraw函数中进行处理,由于未重新super函数,因此SpannableString的setSpan函数失效,该方案主要根据分隔符来进行分割,因此分隔符需要唯一。

方案4

       采用GridLayout方式实现,但是原始控件有展示问题,因此对此进行了修改:

public class Typography4Activity extends BaseActivity {

    public static void start(Context context) {
        Intent intent = new Intent();
        intent.setClass(context, Typography4Activity.class);
        context.startActivity(intent);
    }

    private LinearLayout root;
    private Paint leftPaint = new Paint();
    private float textSize;
    private float maxLeftWidth;
    private int middlePadding = 0;
    private float maxRightWidth;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        root = (LinearLayout) LayoutInflater.from(this).inflate(R.layout.activity_typography4, null);
        setContentView(root);
        initPaint();
        findViews();
        loadData();
    }

    private void initPaint() {
        textSize = getResources().getDimensionPixelSize(R.dimen.text_size_13);
        leftPaint.setAntiAlias(true);
        leftPaint.setTextSize(textSize);
        leftPaint.setColor(getResources().getColor(R.color.color_black_999999));
        middlePadding = getResources().getDimensionPixelSize(R.dimen.padding_value);
    }

    private void findViews() {

    }

    private void loadData() {
        addGridLayout(DataSource.getArray());
        TextView view = new TextView(this);
        view.setText("修改后的实现");
        view.setGravity(Gravity.CENTER);
        view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 160));
        root.addView(view);
        addModifyGridLayout(DataSource.getArray());
    }

    private void addGridLayout(JSONArray data) {
        try {
            GridLayout layout = createGridLayout();
            int size = data.length();
            for (int i = 0; i < size; ++i) {
                JSONArray item = (JSONArray) data.get(i);
                String key = item.getString(0);
                String value = (item.length() >= 2) ? item.getString(1) : "";
                GridLayout.Spec row = GridLayout.spec(i);
                GridLayout.Spec col1 = GridLayout.spec(0);
                GridLayout.Spec col2 = GridLayout.spec(1);
                GridLayout.LayoutParams params = new GridLayout.LayoutParams(row, col1);

                TextView title = getLeftTextView(key);
                layout.addView(title, params);

                params = new GridLayout.LayoutParams(row, col2);
                TextView desc = getRightTextView(value);
                layout.addView(desc, params);
            }
            root.addView(layout);
        } catch (Exception e) {

        }
    }

    @NonNull
    private TextView getRightTextView(String value) {
        TextView desc = new TextView(this);
        desc.setTextSize(13);
        desc.setTextColor(getResources().getColor(R.color.black));
        desc.setText(value);
        return desc;
    }

    @NonNull
    private TextView getLeftTextView(String key) {
        TextView title = new TextView(this);
        title.setText(key);
        title.setPadding(0, middlePadding, middlePadding, 0);
        title.setTextColor(getResources().getColor(R.color.color_black_999999));
        title.setTextSize(13);
        return title;
    }

    private void addModifyGridLayout(JSONArray data) {
        try {
            calculateLeftMaxWidth(data);
            GridLayout layout = createGridLayout();
            int size = data.length();
            for (int i = 0; i < size; ++i) {
                JSONArray item = (JSONArray) data.get(i);
                GridLayout.Spec row = GridLayout.spec(i);

                String key = item.getString(0);
                GridLayout.Spec col1 = GridLayout.spec(0);
                GridLayout.LayoutParams params = new GridLayout.LayoutParams(row, col1);

                TextView title = getLeftTextView(key);
                layout.addView(title, params);

                String value = (item.length() >= 2) ? item.getString(1) : "";
                GridLayout.Spec col2 = GridLayout.spec(1);
                params = new GridLayout.LayoutParams(row, col2);

                TextView desc = getRightTextView(value);
                params.width = (int) maxRightWidth;
                params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
                layout.addView(desc, params);
            }
            root.addView(layout);
        } catch (Exception e) {

        }
    }

    private void calculateLeftMaxWidth(JSONArray data) {
        try {
            DisplayUtil.init(this);// 这个可以在应用程序起来的时候init
            int size = data.length();
            for (int i = 0; i < size; ++i) {
                JSONArray o = (JSONArray) data.get(i);
                String key = o.getString(0);
                String value = o.getString(1);
                if (TextUtils.isEmpty(key) || TextUtils.isEmpty(value)) {
                    continue;
                }
                float curWidth = leftPaint.measureText(key);
                if (curWidth > maxLeftWidth) {
                    maxLeftWidth = curWidth;
                }
            }
            maxLeftWidth = maxLeftWidth + middlePadding;
            maxRightWidth = DisplayUtil.screenWidth - DisplayUtil.dp2px(this, 32 + 10) - maxLeftWidth;
        } catch (Exception e) {

        }
    }

    private GridLayout createGridLayout() {
        GridLayout layout = new GridLayout(this);
        layout.setColumnCount(2);
        //layout.setRowCount(5);
        layout.setOrientation(GridLayout.HORIZONTAL);
        return layout;
    }
}

       如果直接创建一个GridLayout,里面添加每一项,如果描述过长都导致显示不全,这个是系统的一个bug,计算的宽度有问题,因此需要对此方案进行更改。
       更改方式为先计算左边占用的最大宽度,在添加右边的项时,设置布局参数控制最大的长度。

方案5

       采用每一行一个布局,手动一行一行进行添加:

public class Typography5Activity extends BaseActivity {

    public static void start(Context context) {
        Intent intent = new Intent();
        intent.setClass(context, Typography5Activity.class);
        context.startActivity(intent);
    }


    private LinearLayout root;
    private Paint leftPaint = new Paint();
    private float textSize;
    private float maxLeftWidth;
    private int middlePadding = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        root = (LinearLayout) LayoutInflater.from(this).inflate(R.layout.activity_typography5, null);
        setContentView(root);
        initPaint();
        loadData();
    }

    private void initPaint() {
        textSize = getResources().getDimensionPixelSize(R.dimen.text_size_13);
        leftPaint.setAntiAlias(true);
        leftPaint.setTextSize(textSize);
        leftPaint.setColor(getResources().getColor(R.color.color_black_999999));
        middlePadding = getResources().getDimensionPixelSize(R.dimen.padding_value);
    }

    private void loadData() {
        JSONArray array = DataSource.getArray();
        calculateLeftMaxWidth(array);
        if (array != null) {
            try {
                int size = array.length();
                for (int i = 0; i < size; ++i) {
                    JSONArray o = (JSONArray) array.get(i);
                    String key = o.getString(0);
                    String value = o.getString(1);
                    addItem(key, value);
                }
            } catch (Exception e) {

            }
        }
    }

    private void calculateLeftMaxWidth(JSONArray data) {
        try {
            int size = data.length();
            for (int i = 0; i < size; ++i) {
                JSONArray o = (JSONArray) data.get(i);
                String key = o.getString(0);
                String value = o.getString(1);
                if (TextUtils.isEmpty(key) || TextUtils.isEmpty(value)) {
                    continue;
                }
                float curWidth = leftPaint.measureText(key);
                if (curWidth > maxLeftWidth) {
                    maxLeftWidth = curWidth;
                }
            }
            maxLeftWidth = maxLeftWidth + middlePadding;
        } catch (Exception e) {

        }
    }

    private void addItem(String key, String value) {
        LinearLayout layout = getItemLayout();
        TextView left = (TextView) layout.findViewById(R.id.left);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);

        params.width = (int) maxLeftWidth;
        left.setLayoutParams(params);
        left.setText(key);

        TextView right = (TextView) layout.findViewById(R.id.right);
        right.setText(value);

        root.addView(layout);
    }

    private LinearLayout getItemLayout() {
        LinearLayout layout = (LinearLayout) LayoutInflater.from(this).inflate(R.layout.compose_item_layout, null);
        return layout;
    }
}

       改方案也需要先计算左边的最大占用宽度,来设置右边占用的大小,每一项的布局如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:paddingTop="@dimen/text_padding_10"
    tools:context=".activity.Typography1Activity">

    <TextView
        android:id="@+id/left"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="@dimen/text_padding_10"
        android:textColor="@color/color_black_999999"
        android:textSize="@dimen/text_size_13"/>

    <TextView
        android:id="@+id/right"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textColor="@color/black"
        android:textSize="@dimen/text_size_13"/>


</LinearLayout>

       每一行有两个TextView,左边宽度为自适应,右边占据剩下左右的位置,在计算出左边最大宽度后,重新设置左边每一个TextView占用的宽度。

方案6

       方式与1差不多,但是不在继承TextView,而是直接继承View:

public class TypographyView4 extends View {

    private Paint leftPaint = new Paint();
    private Paint rightPaint = new Paint();
    private int fullWidth;
    private float textSize;
    private JSONArray array;
    private int middlePadding = 0;
    float maxLeftWidth = 0;
    int itemSize = 0;

    public TypographyView4(Context context) {
        super(context);
        init();
    }

    public TypographyView4(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public TypographyView4(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        textSize = getResources().getDimensionPixelSize(R.dimen.text_size_13);
        leftPaint.setAntiAlias(true);
        leftPaint.setTextSize(textSize);
        leftPaint.setColor(getResources().getColor(R.color.color_black_999999));
        rightPaint.setAntiAlias(true);
        rightPaint.setTextSize(textSize);
        rightPaint.setColor(getResources().getColor(R.color.color_black));
        middlePadding = getResources().getDimensionPixelSize(R.dimen.padding_value);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        fullWidth = getWidth();// 整个textView的宽度
    }

    public void setText(JSONArray array) {
        this.array = array;
        if (array != null) {
            try {
                int size = itemSize = array.length();
                for (int i = 0; i < size; ++i) {
                    JSONArray o = (JSONArray) array.get(i);
                    String key = o.getString(0);
                    String value = o.getString(1);
                    if (TextUtils.isEmpty(key) || TextUtils.isEmpty(value)) {
                        itemSize--;
                        continue;
                    }
                    float curWidth = leftPaint.measureText(key);
                    if (curWidth > maxLeftWidth) {
                        maxLeftWidth = curWidth;
                    }
                }
                maxLeftWidth = maxLeftWidth + middlePadding;
                invalidate();
            } catch (Exception e) {

            }
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (array == null) {
            return;
        }
        int lineCount = 0;
        try {
            JSONArray item;
            float offsetY;
            for (int i = 0; i < itemSize; ++i) {
                item = (JSONArray) array.get(i);
                offsetY = (lineCount + 1) * textSize;
                canvas.drawText(item.getString(0), 0, offsetY, leftPaint);

                String value = item.getString(1);
                float valueWidth = rightPaint.measureText(value);
                if (valueWidth > fullWidth - maxLeftWidth) {// 一行显示不完
                    char[] textCharArray = value.toCharArray();
                    float charWidth;
                    float drawWidth = maxLeftWidth;
                    for (int j = 0; j < textCharArray.length; j++) {
                        charWidth = rightPaint.measureText(textCharArray, j, 1);
                        if (fullWidth - drawWidth < charWidth) {
                            lineCount++;
                            drawWidth = maxLeftWidth;
                            offsetY += textSize;
                        }
                        canvas.drawText(textCharArray, j, 1, drawWidth, offsetY, rightPaint);
                        drawWidth += charWidth;
                    }
                } else {
                    canvas.drawText(value, maxLeftWidth, offsetY, rightPaint);
                }
                lineCount += 2;
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

       该方案主要继承自View,不再继承TextView,由于在在上述方案中不在调用super,因此TextView已经退化为一个View,因此直接继承View。

总结

       因为左边的宽度不确定,因此所有的方案都进行了同样的一个操作,就是测量了左边显示的最大宽度,后续的操作再根据该宽度进行调整。上述的方案中1,2,3,6都只需用一个View来进行显示,4,5都需要多个View进行显示。
       完整的代码可以在查看链接上进行查看。