Android实现文本排版

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。

一、效果图

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。

二、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。

以上就是本文的全部内容，希望对大家的学习有所帮助。