关于推行textview 显示多行 更多

关于实行textview 显示多行 更多

package cn.com.aisat.huawei.view;
import java.util.ArrayList;
import java.util.List;


import android.content.Context;
import android.graphics.Canvas;  
import android.text.Layout;  
import android.text.Layout.Alignment;  
import android.text.StaticLayout;  
import android.text.TextUtils.TruncateAt;  
import android.util.AttributeSet;  
import android.widget.TextView;   
import android.text.Layout;
import android.text.TextUtils.TruncateAt;


public class EllipsizingTextView extends TextView {


private static final String ELLIPSIS = "......";


public interface EllipsizeListener {
void ellipsizeStateChanged(boolean ellipsized);
}


private final List<EllipsizeListener> ellipsizeListeners = new ArrayList<EllipsizeListener>();


private boolean isEllipsized;
private boolean isStale;
private boolean programmaticChange;
private String fullText;
private int maxLines = -1;
private float lineSpacingMultiplier = 1.0f;
private float lineAdditionalVerticalPadding = 0.0f;


public EllipsizingTextView(Context context) {
super(context);
}


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


public EllipsizingTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}


public void addEllipsizeListener(EllipsizeListener listener) {
if (listener == null) {
throw new NullPointerException();
}
ellipsizeListeners.add(listener);
}


public void removeEllipsizeListener(EllipsizeListener listener) {
ellipsizeListeners.remove(listener);
}


public boolean isEllipsized() {
return isEllipsized;
}


@Override
public void setMaxLines(int maxLines) {
super.setMaxLines(maxLines);
this.maxLines = maxLines;
isStale = true;
}


public int getMaxLines() {
return maxLines;
}


@Override
public void setLineSpacing(float add, float mult) {
this.lineAdditionalVerticalPadding = add;
this.lineSpacingMultiplier = mult;
super.setLineSpacing(add, mult);
}


@Override
protected void onTextChanged(CharSequence text, int start, int before,
int after) {
super.onTextChanged(text, start, before, after);
if (!programmaticChange) {
fullText = text.toString();
isStale = true;
}
}


@Override
protected void onDraw(Canvas canvas) {
if (isStale) {
super.setEllipsize(null);
resetText();
}
super.onDraw(canvas);
}


private void resetText() {
int maxLines = getMaxLines();
String workingText = fullText;
boolean ellipsized = false;
if (maxLines != -1) {
Layout layout = createWorkingLayout(workingText);
if (layout.getLineCount() > maxLines) {


System.out.println(layout.getLineCount() + "\t" + maxLines);
workingText = fullText.substring(0,
layout.getLineEnd(maxLines - 1)).trim();
Layout layout2 = createWorkingLayout(workingText + ELLIPSIS);
while (layout2.getLineCount() > maxLines) {
System.out
.println(layout2.getLineCount() + "\t" + maxLines);
int lastSpace = workingText.lastIndexOf(' ');
System.out.println(lastSpace);
if (lastSpace == -1) {
break;
}
workingText = workingText.substring(0, lastSpace);
}
workingText = workingText + ELLIPSIS;
ellipsized = true;
}
}
if (!workingText.equals(getText())) {
programmaticChange = true;
try {
setText(workingText);
} finally {
programmaticChange = false;
}
}
isStale = false;
if (ellipsized != isEllipsized) {
isEllipsized = ellipsized;
for (EllipsizeListener listener : ellipsizeListeners) {
listener.ellipsizeStateChanged(ellipsized);
}
}
}


private Layout createWorkingLayout(String workingText) {
return new StaticLayout(workingText, getPaint(), getWidth()
- getPaddingLeft() - getPaddingRight(), Alignment.ALIGN_NORMAL,
lineSpacingMultiplier, lineAdditionalVerticalPadding, false);
}


@Override
public void setEllipsize(TruncateAt where) {
// Ellipsize settings are not respected } }
}
}

在java代码中加上setMaxLines（）