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| package wang.raye.library.widge;
import android.annotation.TargetApi; import android.content.Context; import android.content.res.TypedArray; import android.os.Build; import android.text.SpannableStringBuilder; import android.text.Spanned; import android.text.TextPaint; import android.text.TextUtils; import android.text.method.LinkMovementMethod; import android.text.style.ClickableSpan; import android.util.AttributeSet; import android.view.View; import android.view.ViewTreeObserver; import android.widget.TextView;
import wang.raye.library.R;
public class CollapsedTextView extends TextView { private static final String TAG = CollapsedTextView.class.getName(); private int maxLine = 2; private static final String ELLIPSE = "..."; private static final String EXPANDEDTEXT = "全文"; private static final String COLLAPSEDTEXT = "收起"; private String expandedText = EXPANDEDTEXT; private String collapsedText = COLLAPSEDTEXT; private int allLines; private boolean collapsed = true; private String text; private CharSequence collapsedCs; private ReadMoreClickableSpan viewMoreSpan = new ReadMoreClickableSpan();
public CollapsedTextView(Context context) { super(context); init(context,null); }
public CollapsedTextView(Context context, AttributeSet attrs) { super(context, attrs); init(context,attrs); }
public CollapsedTextView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context,attrs); }
@TargetApi(Build.VERSION_CODES.LOLLIPOP) public CollapsedTextView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); init(context,attrs); }
@Override public TextPaint getPaint() { return super.getPaint(); }
private void init(Context context,AttributeSet attrs){ if(attrs != null){ TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.CollapsedTextView); allLines = ta.getInt(R.styleable.CollapsedTextView_trimLines,0); expandedText = ta.getString(R.styleable.CollapsedTextView_expandedText); if(TextUtils.isEmpty(expandedText)){ expandedText = EXPANDEDTEXT; } collapsedText = ta.getString(R.styleable.CollapsedTextView_collapsedText); if(TextUtils.isEmpty(collapsedText)){ collapsedText = COLLAPSEDTEXT; } }
} public void setShowText(final String text){ this.text = text; if(allLines > 0) { getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { ViewTreeObserver obs = getViewTreeObserver(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { obs.removeOnGlobalLayoutListener(this); } else { obs.removeGlobalOnLayoutListener(this); } TextPaint tp = getPaint(); float width = tp.measureText(text); int showWidth = getWidth() - getPaddingRight() - getPaddingLeft(); int lines = (int) (width / showWidth); if (width % showWidth != 0) { lines++; } allLines = (int) (tp.measureText(text + collapsedText) / showWidth); if (lines > maxLine) { int expect = text.length() / lines; int end = 0; int lastLineEnd = 0; int expandedTextWidth = (int) tp.measureText(ELLIPSE + expandedText); for (int i = 1; i <= maxLine; i++) { int tempWidth = 0; if (i == maxLine) {
tempWidth = expandedTextWidth; } end += expect; if (end > text.length()) { end = text.length(); } if (tp.measureText(text, lastLineEnd, end) > showWidth - tempWidth) { end--; while (tp.measureText(text, lastLineEnd, end) > showWidth - tempWidth) { end--; } } else { end++; while (tp.measureText(text, lastLineEnd, end) < showWidth - tempWidth) { end++; } end--; } lastLineEnd = end; } SpannableStringBuilder s = new SpannableStringBuilder(text, 0, end) .append(ELLIPSE) .append(expandedText); collapsedCs = addClickableSpan(s, expandedText); setText(collapsedCs);
setMovementMethod(LinkMovementMethod.getInstance()); } else { setText(text); } } }); setText(""); }else{ setText(text); } }
private CharSequence addClickableSpan(SpannableStringBuilder s, CharSequence trimText) { s.setSpan(viewMoreSpan, s.length() - trimText.length(), s.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); return s; }
private class ReadMoreClickableSpan extends ClickableSpan { @Override public void onClick(final View widget) { if(collapsed){ SpannableStringBuilder s = new SpannableStringBuilder(text) .append(collapsedText); setText(addClickableSpan(s,collapsedText)); }else{ setText(collapsedCs); } collapsed = !collapsed; } } }
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