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March 14, 2019 05:39
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Custom TextView auto scale TextView dynamically
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| /** | |
| * ------------new---------------- | |
| * fork from https://bitbucket.org/ankri/autoscaletextview | |
| * auto scale TextView dynamically | |
| * | |
| * ------------old---------------- | |
| * A custom Text View that lowers the text size when the text is to big for the TextView. Modified version of one found on stackoverflow | |
| * | |
| * @author Andreas Krings - www.ankri.de | |
| * @version 1.0 | |
| */ | |
| public class AutoScaleTextView extends AppCompatTextView { | |
| private Paint textPaint; | |
| private float preferredTextSize; | |
| private float minTextSize; | |
| public AutoScaleTextView(Context context) { | |
| this(context, null); | |
| } | |
| public AutoScaleTextView(Context context, AttributeSet attrs) { | |
| this(context, attrs, R.attr.autoScaleTextViewStyle); | |
| // Use this constructor, if you do not want use the default style | |
| // super(context, attrs); | |
| } | |
| public AutoScaleTextView(Context context, AttributeSet attrs, int defStyle) { | |
| super(context, attrs, defStyle); | |
| this.textPaint = new Paint(); | |
| TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoScaleTextView, defStyle, 0); | |
| this.minTextSize = a.getDimension(R.styleable.AutoScaleTextView_minTextSize, 10f); | |
| a.recycle(); | |
| this.preferredTextSize = this.getTextSize(); | |
| } | |
| /** | |
| * Set the minimum text size for this view | |
| * | |
| * @param minTextSize The minimum text size | |
| */ | |
| public void setMinTextSize(float minTextSize) { | |
| this.minTextSize = minTextSize; | |
| } | |
| /** | |
| * Resize the text so that it fits | |
| * | |
| * @param text The text. Neither <code>null</code> nor empty. | |
| * @param textWidth The width of the TextView. > 0 | |
| */ | |
| private void refitText(String text, int textWidth) { | |
| if (textWidth <= 0 || text == null || text.length() == 0) | |
| return; | |
| // the width | |
| int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight(); | |
| float tempMinTextSize = this.minTextSize; | |
| float tempPreferredTextSize = this.preferredTextSize; | |
| final float threshold = 0.5f; // How close we have to be | |
| this.textPaint.set(this.getPaint()); | |
| while ((tempPreferredTextSize - tempMinTextSize) > threshold) { | |
| float size = (tempPreferredTextSize + tempMinTextSize) / 2; | |
| this.textPaint.setTextSize(size); | |
| if (this.textPaint.measureText(text) >= targetWidth) | |
| tempPreferredTextSize = size; // too big | |
| else | |
| tempMinTextSize = size; // too small | |
| } | |
| // Use min size so that we undershoot rather than overshoot | |
| this.setTextSize(TypedValue.COMPLEX_UNIT_PX, tempMinTextSize); | |
| } | |
| @Override | |
| protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) { | |
| this.refitText(text.toString(), this.getWidth()); | |
| } | |
| @Override | |
| protected void onSizeChanged(int width, int height, int oldwidth, int oldheight) { | |
| if (width != oldwidth) | |
| this.refitText(this.getText().toString(), width); | |
| } | |
| } | |
| -------attr-------- | |
| <attr name="autoScaleTextViewStyle" format="reference" /> | |
| <declare-styleable name="AutoScaleTextView"> | |
| <attr name="minTextSize" format="dimension" /> | |
| </declare-styleable> | |
| --------layout-------- | |
| <com.xxx.xxx.view.AutoScaleTextView | |
| android:text="@string/jellybean" | |
| android:layout_width="@dimen/width" | |
| android:layout_height="@dimen/height" | |
| android:layout_margin="5dp" | |
| android:textSize="16dp" | |
| app:minTextSize="12dp" | |
| /> |
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