android图文居中按钮控件

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import com.winfo.gdmsaec.app.R;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.Button;public class MyIconButton extends Button {    protected int drawableWidth;    protected DrawablePositions drawablePosition;    protected int iconPadding;    Rect bounds;    private enum DrawablePositions {        NONE,        LEFT_AND_RIGHT,        LEFT,        RIGHT    }    public MyIconButton(Context context) {        super(context);        bounds = new Rect();    }    public MyIconButton(Context context, AttributeSet attrs) {        super(context, attrs);        bounds = new Rect();        applyAttributes(attrs);    }    protected void applyAttributes(AttributeSet attrs) {        if (null == bounds) {            bounds = new Rect();        }        TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.MyIconButton);        int paddingId = typedArray.getDimensionPixelSize(R.styleable.MyIconButton_iconPadding, 0);        setIconPadding(paddingId);        typedArray.recycle();    }    public void setIconPadding(int padding) {        iconPadding = padding;        requestLayout();    }    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        super.onLayout(changed, left, top, right, bottom);        Paint textPaint = getPaint();        String text = getText().toString();        textPaint.getTextBounds(text, 0, text.length(), bounds);        int textWidth = bounds.width();        int factor = (drawablePosition == DrawablePositions.LEFT_AND_RIGHT) ? 2 : 1;        int contentWidth = drawableWidth + iconPadding * factor + textWidth;        int horizontalPadding = (int) ((getWidth() / 2.0) - (contentWidth / 2.0));        setCompoundDrawablePadding(-horizontalPadding + iconPadding);        switch (drawablePosition) {            case LEFT:                setPadding(horizontalPadding, getPaddingTop(), 0, getPaddingBottom());                break;            case RIGHT:                setPadding(0, getPaddingTop(), horizontalPadding, getPaddingBottom());                break;            case LEFT_AND_RIGHT:                setPadding(horizontalPadding, getPaddingTop(), horizontalPadding, getPaddingBottom());                break;            default:                setPadding(0, getPaddingTop(), 0, getPaddingBottom());        }    }    @Override    public void setCompoundDrawablesWithIntrinsicBounds(Drawable left, Drawable top, Drawable right, Drawable bottom) {        super.setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom);        if (left != null && right != null) {            drawableWidth = left.getIntrinsicWidth() + right.getIntrinsicWidth();            drawablePosition = DrawablePositions.LEFT_AND_RIGHT;        } else if (left != null) {            drawableWidth = left.getIntrinsicWidth();            drawablePosition = DrawablePositions.LEFT;        } else if (right != null) {            drawableWidth = right.getIntrinsicWidth();            drawablePosition = DrawablePositions.RIGHT;        } else {            drawablePosition = DrawablePositions.NONE;        }        requestLayout();    }}

使用时在xml文件头部加上

xmlns:padding="http://schemas.android.com/apk/res/项目包名"

<com....widget.MyIconButton
            android:id="@+id/main_system_different"
            style="@style/MyIconButton"
            android:background="@drawable/main_btn_right_bg"
            android:drawableLeft="@drawable/system_set"
            android:text="@string/system_setting"
            padding:iconPadding="3dp" />这个值是图片和文字之间的距离使用者可根据情况设定

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