Android中的多列文本显示
我想在2列中显示文本 例如,我有一个大字符串,第一个字符串加在第一列,在屏幕高度结束后,文本应该加在第二列。就像新闻记者一样 我尝试了下面的代码,但它给了我java.lang.StringIndexOutOfBoundsException java代码Android中的多列文本显示,android,android-layout,Android,Android Layout,我想在2列中显示文本 例如,我有一个大字符串,第一个字符串加在第一列,在屏幕高度结束后,文本应该加在第二列。就像新闻记者一样 我尝试了下面的代码,但它给了我java.lang.StringIndexOutOfBoundsException java代码 final TextView tvl = (TextView)findViewById(R.id.textl); final TextView tvr = (TextView)findViewById(R.id.textr); f
final TextView tvl = (TextView)findViewById(R.id.textl);
final TextView tvr = (TextView)findViewById(R.id.textr);
final String text = "sdf";
tvl.post(new Runnable() {
@Override
public void run() {
TextMeasure(text,tvl,tvr);
}
});
private void TextMeasure(String text,
TextView tvl,TextView tvr) {
// Get number of lines of text that will fit on the screen
int linesPerScreen = tvl.getHeight()/(tvl.getLineHeight() );
// Measure how much text will fit across the TextView
Paint paint = tvl.getPaint();
int textWidth = paint.breakText(text, 0, text.length(),
true, tvl.getWidth(), null);
// Total amount of text to fill the TextView is
// approximately:
int totalText = textWidth * linesPerScreen;
String leftText = text.substring(0,totalText);
String rightText = text.substring(totalText,
text.length());
tvl.setText(leftText);
tvr.setText(rightText);
}
xml
在尝试从文本获取子字符串之前,请确保totalText变量小于text.length()您可以使用表行并在其中插入TextView。然后将字符串分成两部分,并将它们放在相邻放置的两个textview中
<TableRow>
<TextView
android:text=""
android:id="+id/col1"
android:padding="10dip" />
<TextView
android:text=""
android:id="+id/col2"
android:gravity="right"
android:padding="10dip" />
</TableRow>
将字符串分成两部分后,将它们放在TableLayout的两个TextView中
这会奏效的 我刚刚创建了一个示例项目,将文本呈现到多个列: 这种方法使用android/text/Layout类来格式化和绘制文本
protected void onDraw(Canvas canvas) {
if(mTextLayoutNeeded) {
createLayouts(getWidth(), getHeight());
}
super.onDraw(canvas);
canvas.save();
canvas.translate(getPaddingLeft(), getPaddingTop());
for(Layout l : layouts) {
l.draw(canvas);
canvas.translate(mColumnWidth, 0);
canvas.translate(mSpacing, 0);
}
canvas.restore();
}
private void createLayouts(int width, int height) {
layouts.clear();
if(mText == null) {
return;
}
int availableWidth = getWidth() - getPaddingLeft() - getPaddingRight();
int availableHeight = getHeight() - getPaddingTop() - getPaddingBottom();
Layout masterLayout = createLayout(mColumnWidth, mText, mPaint);
int startLine = 0;
int usedWidth = 0;
while(usedWidth < availableWidth - mSpacing - mColumnWidth) {
int startLineTop = masterLayout.getLineTop(startLine);
int endLine = startLine;
for(int i = startLine; i < masterLayout.getLineCount(); i++) {
if(masterLayout.getLineBottom(i) - startLineTop < availableHeight) {
endLine = i;
} else if(endLine == startLine) {
//A large image can be larger than the available height, skip the content
Toast.makeText(getContext(), "Skipping too large content", Toast.LENGTH_SHORT).show();
startLine++;
startLineTop = masterLayout.getLineTop(startLine);
endLine = startLine;
} else {
break;
}
}
int columnStart = masterLayout.getLineStart(startLine);
int columnEnd = masterLayout.getLineEnd(endLine);
layouts.add(createLayout(mColumnWidth, mText, columnStart, columnEnd, mPaint));
if(endLine == masterLayout.getLineCount() - 1) {
break;
}
usedWidth += mColumnWidth;
startLine = endLine;
}
mTextLayoutNeeded = false;
}
private static Layout createLayout(int width, CharSequence text, TextPaint paint) {
return new StaticLayout(text, 0, text.length(), paint,
width, Layout.Alignment.ALIGN_NORMAL, 1f, 0, true);
}
private static Layout createLayout(int width, CharSequence text, int offset, int end, TextPaint paint) {
return new StaticLayout(text, offset, end, paint,
width, Layout.Alignment.ALIGN_NORMAL, 1f, 0, true);
}
受保护的void onDraw(画布){
如果(MTextLayoutRequired){
createLayouts(getWidth(),getHeight());
}
super.onDraw(帆布);
canvas.save();
translate(getPaddingLeft(),getPaddingTop());
用于(布局l:布局){
l、 绘画(画布);
canvas.translate(mColumnWidth,0);
canvas.translate(mSpacing,0);
}
canvas.restore();
}
专用void createLayouts(整数宽度、整数高度){
布局。清除();
if(多行文字==null){
返回;
}
int availableWidth=getWidth()-getPaddingLeft()-getPaddingRight();
int availablewhight=getHeight()-getPaddingTop()-getPaddingBottom();
Layout masterLayout=createLayout(mColumnWidth、mText、mPaint);
int=0;
int usedWidth=0;
while(usedWidth
否,如果第一列已完成,我只想在第二列中添加。虽然此链接可以回答问题,但最好在此处包含答案的基本部分,并提供链接以供参考。如果链接页面发生更改,则仅链接答案可能无效您完全正确!编辑答案,以包含基本部分。
protected void onDraw(Canvas canvas) {
if(mTextLayoutNeeded) {
createLayouts(getWidth(), getHeight());
}
super.onDraw(canvas);
canvas.save();
canvas.translate(getPaddingLeft(), getPaddingTop());
for(Layout l : layouts) {
l.draw(canvas);
canvas.translate(mColumnWidth, 0);
canvas.translate(mSpacing, 0);
}
canvas.restore();
}
private void createLayouts(int width, int height) {
layouts.clear();
if(mText == null) {
return;
}
int availableWidth = getWidth() - getPaddingLeft() - getPaddingRight();
int availableHeight = getHeight() - getPaddingTop() - getPaddingBottom();
Layout masterLayout = createLayout(mColumnWidth, mText, mPaint);
int startLine = 0;
int usedWidth = 0;
while(usedWidth < availableWidth - mSpacing - mColumnWidth) {
int startLineTop = masterLayout.getLineTop(startLine);
int endLine = startLine;
for(int i = startLine; i < masterLayout.getLineCount(); i++) {
if(masterLayout.getLineBottom(i) - startLineTop < availableHeight) {
endLine = i;
} else if(endLine == startLine) {
//A large image can be larger than the available height, skip the content
Toast.makeText(getContext(), "Skipping too large content", Toast.LENGTH_SHORT).show();
startLine++;
startLineTop = masterLayout.getLineTop(startLine);
endLine = startLine;
} else {
break;
}
}
int columnStart = masterLayout.getLineStart(startLine);
int columnEnd = masterLayout.getLineEnd(endLine);
layouts.add(createLayout(mColumnWidth, mText, columnStart, columnEnd, mPaint));
if(endLine == masterLayout.getLineCount() - 1) {
break;
}
usedWidth += mColumnWidth;
startLine = endLine;
}
mTextLayoutNeeded = false;
}
private static Layout createLayout(int width, CharSequence text, TextPaint paint) {
return new StaticLayout(text, 0, text.length(), paint,
width, Layout.Alignment.ALIGN_NORMAL, 1f, 0, true);
}
private static Layout createLayout(int width, CharSequence text, int offset, int end, TextPaint paint) {
return new StaticLayout(text, offset, end, paint,
width, Layout.Alignment.ALIGN_NORMAL, 1f, 0, true);
}