テキストの長さに合わせてTextViewフォントのサイズを自動的に変更
2707 ワード
package me.mcar.parking.control;
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
public class AutoAjustSizeTextView extends TextView
{
private static float DEFAULT_MIN_TEXT_SIZE = 10;
private static float DEFAULT_MAX_TEXT_SIZE = 16;
// Attributes
private Paint testPaint;
private float minTextSize, maxTextSize;
public AutoAjustSizeTextView(Context context, AttributeSet attrs)
{
super(context, attrs);
initialise();
}
private void initialise()
{
testPaint = new Paint();
testPaint.set(this.getPaint());
maxTextSize = this.getTextSize();
if (maxTextSize <= DEFAULT_MIN_TEXT_SIZE)
{
maxTextSize = DEFAULT_MAX_TEXT_SIZE;
}
minTextSize = DEFAULT_MIN_TEXT_SIZE;
};
/**
* Re size the font so the specified text fits in the text box * assuming
* the text box is the specified width.
*/
private void refitText(String text, int textWidth)
{
if (textWidth > 0)
{
int availableWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
float trySize = maxTextSize;
testPaint.setTextSize(trySize);
while ((trySize > minTextSize) && (testPaint.measureText(text) > availableWidth))
{
trySize -= 1;
if (trySize <= minTextSize)
{
trySize = minTextSize;
break;
}
testPaint.setTextSize(trySize);
}
this.setTextSize(trySize);
}
};
@Override
protected void onTextChanged(CharSequence text, int start, int before, int after)
{
super.onTextChanged(text, start, before, after);
refitText(text.toString(), this.getWidth());
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
if (w != oldw)
{
refitText(this.getText().toString(), w);
}
}
}
コントロールの使用方法
<me.mcar.parking.control.AutoAjustSizeTextView
android:id="@+id/parklist_item_address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:textColor="#A0A0A0"
android:textSize="12sp" />