Android實(shí)現(xiàn)文本排版
更新時(shí)間：2016年04月18日 17:23:48 作者：xueshanhaizi
這篇文章主要介紹了Android實(shí)現(xiàn)文本排版,對(duì)多行文本進(jìn)行排版布局，每一行的內(nèi)容又分為兩部分，左邊為標(biāo)題，右邊為描述，左邊內(nèi)容長度不確定，右邊的內(nèi)容需要對(duì)齊，需要的朋友可以參考下
在項(xiàng)目中有一個(gè)小功能需要實(shí)現(xiàn)，就是對(duì)多行文本進(jìn)行排版布局，每一行的內(nèi)容又分為兩部分，左邊為標(biāo)題，右邊為描述，左邊內(nèi)容長度不確定，右邊的內(nèi)容需要對(duì)齊，如有換行也需要對(duì)齊右邊的文本。
一、效果圖
可以看到內(nèi)容分成了兩部分，左邊的顏色與右邊不一致，右邊的描述文案統(tǒng)一對(duì)齊。
二、實(shí)現(xiàn)方案
以上功能，由于輸入內(nèi)容輸入行數(shù)不確定，并且左邊的文案長度也不確定，因此不能直接在布局中實(shí)現(xiàn)，基于此這里主要實(shí)現(xiàn)了以下6種方式
方案1
采用自定義控件的方式，繼承TextView，重新onDraw函數(shù)，實(shí)現(xiàn)如下：
/**
* 計(jì)算出左邊最長的顯示字符串maxLeftWidth，之后draw每一行字符，右邊的描述從maxLeftWidth開始draw
* 當(dāng)一行顯示不完全時(shí)，折行并且空出maxLeftWidth的空格長度
*/
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();// 整個(gè)textView的寬度
}
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) {// 一行顯示不完
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)作為數(shù)據(jù)輸入，并且在這里面測(cè)量了左邊title的最大寬度，之后調(diào)用invalidate觸發(fā)重繪，在onSizeChanged獲取整個(gè)控件的寬度，重繪會(huì)調(diào)用onDraw函數(shù)，這里不需要調(diào)用super函數(shù)，TextView的onDraw函數(shù)做了非常多的操作，解析傳入的數(shù)據(jù)，分別一行一行調(diào)用canvas來進(jìn)行drawText操作，當(dāng)繪制描述時(shí)，先計(jì)算寬度，如果超過剩余控件說明需要換行，最后調(diào)用setHeight設(shè)置高度，這個(gè)加一個(gè)判斷條件，因?yàn)闀?huì)觸發(fā)requestLayout()進(jìn)行重新布局和invalidate()進(jìn)行重繪，如果不加判斷會(huì)一直重繪。
方案2
方式2與方式1差不多，不同為所有計(jì)算都在onDraw函數(shù)中：
/**
* 該方式與方式1很類似，只是所有的計(jì)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();// 整個(gè)textView的寬度
}
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();
}
}
}
該方案的實(shí)現(xiàn)是不太好的，方案1也是在此基礎(chǔ)上進(jìn)行調(diào)整的，在這里放出來只是為了說明，所有的計(jì)算不要全部放在onDraw里面，因?yàn)樵摲椒赡軙?huì)反復(fù)調(diào)用多次，這樣就降低了性能。
方案3
將數(shù)據(jù)源拼接成SpannableString，重寫onDraw函數(shù)，根據(jù)內(nèi)容draw每一個(gè)字符：
/**
* 該方法，是需要顯示的內(nèi)容先拼接成SpannableString，在onDraw方法中獲取所有的char字符，一個(gè)一個(gè)比較
* 當(dāng)為分號(hào)是，表示為key與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();// 整個(gè)textView的寬度
}
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) {// 換行
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();
// 已繪的寬度
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);
}
}
這里先計(jì)算左邊title的最大寬度，同時(shí)將所有的數(shù)據(jù)拼接成一個(gè)SpannableStringBuilder，調(diào)用setText函數(shù)會(huì)觸發(fā)重繪，在onDraw函數(shù)中進(jìn)行處理，由于未重新super函數(shù)，因此SpannableString的setSpan函數(shù)失效，該方案主要根據(jù)分隔符來進(jìn)行分割，因此分隔符需要唯一。
方案4
采用GridLayout方式實(shí)現(xiàn)，但是原始控件有展示問題，因此對(duì)此進(jìn)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("修改后的實(shí)現(xiàn)");
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);// 這個(gè)可以在應(yīng)用程序起來的時(shí)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;
}
}
如果直接創(chuàng)建一個(gè)GridLayout，里面添加每一項(xiàng)，如果描述過長都導(dǎo)致顯示不全，這個(gè)是系統(tǒng)的一個(gè)bug，計(jì)算的寬度有問題，因此需要對(duì)此方案進(jìn)行更改。
更改方式為先計(jì)算左邊占用的最大寬度，在添加右邊的項(xiàng)時(shí)，設(shè)置布局參數(shù)控制最大的長度。
方案5
采用每一行一個(gè)布局，手動(dòng)一行一行進(jìn)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;
}
}
改方案也需要先計(jì)算左邊的最大占用寬度，來設(shè)置右邊占用的大小，每一項(xiàng)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>
每一行有兩個(gè)TextView，左邊寬度為自適應(yīng)，右邊占據(jù)剩下左右的位置，在計(jì)算出左邊最大寬度后，重新設(shè)置左邊每一個(gè)TextView占用的寬度。
方案6
方式與1差不多，但是不在繼承TextView，而是直接繼承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();// 整個(gè)textView的寬度
}
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) {// 一行顯示不完
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();
}
}
}
該方案主要繼承自View，不再繼承TextView，由于在在上述方案中不在調(diào)用super，因此TextView已經(jīng)退化為一個(gè)View,因此直接繼承View。
總結(jié)
因?yàn)樽筮叺膶挾炔淮_定，因此所有的方案都進(jìn)行了同樣的一個(gè)操作，就是測(cè)量了左邊顯示的最大寬度，后續(xù)的操作再根據(jù)該寬度進(jìn)行調(diào)整。上述的方案中1，2，3，6都只需用一個(gè)View來進(jìn)行顯示，4，5都需要多個(gè)View進(jìn)行顯示。
完整的代碼可以在查看鏈接上進(jìn)行查看。
以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助。
相關(guān)文章
Android?利用ImageView屬性實(shí)現(xiàn)選中和未選中效果
這篇文章主要介紹了Android巧用ImageView屬性實(shí)現(xiàn)選中和未選中效果,實(shí)現(xiàn)思路通常我們會(huì)選擇在布局里加個(gè)ImageView,然后通過代碼層面加個(gè)判斷去讓ImageView加載不同狀態(tài)的圖片，需要的朋友可以參考下2023-06-06
Android 組件Gallery和GridView示例講解
本文主要講解Android 組件Gallery和GridView,這里詳細(xì)介紹組件Gallery和GridView的知識(shí)要點(diǎn)，并附示例代碼和實(shí)現(xiàn)效果圖，有興趣的小伙伴可以參考下2016-08-08
Android數(shù)據(jù)持久化之SQLite數(shù)據(jù)庫用法分析
這篇文章主要介紹了Android數(shù)據(jù)持久化之SQLite數(shù)據(jù)庫用法,結(jié)合實(shí)例形式分析了SQLite概念、功能、相關(guān)操作類與使用技巧,需要的朋友可以參考下2017-05-05
Android 活動(dòng)條ActionBar的詳解及實(shí)例代碼
這篇文章主要介紹了Android 活動(dòng)條ActionBar的詳解及實(shí)例代碼的相關(guān)資料,需要的朋友可以參考下2016-12-12
FloatingActionButton增強(qiáng)版一個(gè)按鈕跳出多個(gè)按鈕第三方開源之FloatingActionButton
這篇文章主要介紹了FloatingActionButton增強(qiáng)版一個(gè)按鈕跳出多個(gè)按鈕第三方開源之FloatingActionButton 的相關(guān)資料,需要的朋友可以參考下2015-12-12
Android Messenger實(shí)現(xiàn)進(jìn)程間雙向通信
這篇文章主要為大家詳細(xì)介紹了Messenger實(shí)現(xiàn)進(jìn)程間雙向通信，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下2021-05-05
Android View移動(dòng)的3種方式總結(jié)
這篇文章主要給大家介紹了Android View移動(dòng)的三種方式，在介紹這三種方式之前先介紹了Android坐標(biāo)系的定義規(guī)則以及View的一些位置參數(shù)。有需要的朋友們可以參考借鑒。2016-09-09
kotlin object關(guān)鍵字單例模式實(shí)現(xiàn)示例詳解
這篇文章主要為大家介紹了kotlin object關(guān)鍵字單例模式實(shí)現(xiàn)示例詳解，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進(jìn)步，早日升職加薪2023-01-01
SQLiteStudio優(yōu)雅調(diào)試Android手機(jī)數(shù)據(jù)庫Sqlite（推薦）
這篇文章主要介紹了SQLiteStudio優(yōu)雅調(diào)試Android手機(jī)數(shù)據(jù)庫Sqlite的相關(guān)資料,需要的朋友可以參考下2017-11-11
Android應(yīng)用程序簽名步驟及相關(guān)知識(shí)介紹
本文主要介紹Android應(yīng)用程序簽名相關(guān)的理論知識(shí)，包括：什么是簽名、為什么要給應(yīng)用程序簽名、如何給應(yīng)用程序簽名等,感興趣的朋友可以參考下哈2013-04-04