[code hl="1, 4, 7"] String sampleText = "This is a test strike"; SpannableStringBuilder spanBuilder = new SpannableStringBuilder(sampleText); StrikethroughSpan strikethroughSpan = new StrikethroughSpan(); spanBuilder.setSpan( strikethroughSpan, // Span to add 0, // Start 4, // End of the span (exclusive) Spanned.SPAN_EXCLUSIVE_EXCLUSIVE // Text changes will not reflect in the strike changing ); textView.setText(spanBuilder); [/code]


Section 4.3: TextView with image

Android allows programmers to place images at all four corners of a TextView. For example, if you are creating a field with a TextView and at same time you want to show that the field is editable, then developers will usually place an edit icon near that field. Android provides us an interesting option called compound drawable for a TextView:


You can set the drawable to any side of your TextView as follows:


Setting the drawable can also be achieved programmatically in the following way:


Setting any of the parameters handed over to setCompoundDrawables() to null will remove the icon from the corresponding side of the TextView.

[code hl="1, 4, 7"] [/code]

[code hl="1, 4, 7"] TextView txtView = (TextView) findViewById(R.id.txtView); SpannableString spannableString = new SpannableString("RM123.456"); spannableString.setSpan( new TopAlignSuperscriptSpan( (float)0.35 ), 0, 2, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE ); txtView.setText(spannableString); [/code]

[code hl="1, 4, 7"] private class TopAlignSuperscriptSpan extends SuperscriptSpan { //divide superscript by this number protected int fontScale = 2; //shift value, 0 to 1.0 protected float shiftPercentage = 0; //doesn't shift TopAlignSuperscriptSpan() {} //sets the shift percentage TopAlignSuperscriptSpan( float shiftPercentage ) { if( shiftPercentage > 0.0 && shiftPercentage < 1.0 ) this.shiftPercentage = shiftPercentage; } @Override public void updateDrawState( TextPaint tp ) { //original ascent float ascent = tp.ascent(); //scale down the font tp.setTextSize( tp.getTextSize() / fontScale ); //get the new font ascent float newAscent = tp.getFontMetrics().ascent; //move baseline to top of old font, then move down size of new font //adjust for errors with shift percentage tp.baselineShift += ( ascent - ascent * shiftPercentage ) - (newAscent - newAscent * shiftPercentage ); } @Override public void updateMeasureState( TextPaint tp ) { updateDrawState( tp ); } } [/code]

[code hl="1, 4, 7"] [/code]

[code hl="1, 4, 7"] import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.TextView; public class MyTextViewPinchZoomClass extends Activity implements OnTouchListener { final static float STEP = 200; TextView mytv; float mRatio = 1.0f; int mBaseDist; float mBaseRatio; float fontsize = 13; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mytv = (TextView) findViewById(R.id.mytv); mytv.setTextSize(mRatio + 13); } public boolean onTouchEvent(MotionEvent event) { if (event.getPointerCount() == 2) { int action = event.getAction(); int pureaction = action & MotionEvent.ACTION_MASK; if (pureaction == MotionEvent.ACTION_POINTER_DOWN) { mBaseDist = getDistance(event); mBaseRatio = mRatio; } else { float delta = (getDistance(event) - mBaseDist) / STEP; float multi = (float) Math.pow(2, delta); mRatio = Math.min(1024.0f, Math.max(0.1f, mBaseRatio * multi)); mytv.setTextSize(mRatio + 13); } } return true; } int getDistance(MotionEvent event) { int dx = (int) (event.getX(0) - event.getX(1)); int dy = (int) (event.getY(0) - event.getY(1)); return (int) (Math.sqrt(dx * dx + dy * dy)); } public boolean onTouch(View v, MotionEvent event) { return false; } } [/code]

[code hl="1, 4, 7"] TextView textView = (TextView) findViewById(R.id.textView); Spannable span = new SpannableString(textView.getText()); span.setSpan(new RelativeSizeSpan(0.8f), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); textView.setText(span) [/code]