android textview动态设置drawabletop,android TextView 设置Drawable的大小
在项目中，经常会遇到文字旁边是图片的UI，使用LinearLayout布局显得非常累赘，且会影响性能，最明智的方法是自定义一个TextView，实现方法如下：
public class TextDrawable extends android.support.v7.widget.AppCompatTextView {
private Drawable drawableLeft;
private Drawable drawableRight;
private Drawable drawableTop;
private int leftWidth;
private int rightWidth;
private int topWidth;
private int leftHeight;
private int rightHeight;
private int topHeight;
private Context mContext;
public TextDrawable(Context context) {
super(context);
this.mContext = context;
init(context, null);
}
public TextDrawable(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
init(context, attrs);
}
public TextDrawable(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.TextDrawable);
drawableLeft = typedArray.getDrawable(R.styleable.TextDrawable_leftDrawable);
drawableRight = typedArray.getDrawable(R.styleable.TextDrawable_rightDrawable);
drawableTop = typedArray.getDrawable(R.styleable.TextDrawable_topDrawable);
if (drawableLeft != null) {
leftWidth = typedArray.getDimensionPixelOffset(R.styleable.TextDrawable_leftDrawableWidth, dip2px(context, 20));
leftHeight = typedArray.getDimensionPixelOffset(R.styleable.TextDrawable_leftDrawableHeight, dip2px(context, 20));
}
if (drawableRight != null) {
rightWidth = typedArray.getDimensionPixelOffset(R.styleable.TextDrawable_rightDrawableWidth, dip2px(context, 20));
rightHeight = typedArray.getDimensionPixelOffset(R.styleable.TextDrawable_rightDrawableHeight, dip2px(context, 20));
}
if (drawableTop != null) {
topWidth = typedArray.getDimensionPixelOffset(R.styleable.TextDrawable_topDrawableWidth, dip2px(context, 20));
topHeight = typedArray.getDimensionPixelOffset(R.styleable.TextDrawable_topDrawableHeight, dip2px(context, 20));
}
}
public int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (drawableLeft != null) {
drawableLeft.setBounds(0, 0, leftWidth, leftHeight);
}
if (drawableRight != null) {
drawableRight.setBounds(0, 0, rightWidth, rightHeight);
}
if (drawableTop != null) {
drawableTop.setBounds(0, 0, topWidth, topHeight);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
this.setCompoundDrawables(drawableLeft, drawableTop, drawableRight, null);
}
/**
* 设置左侧图片并重绘
*/
public void setDrawableLeft(Drawable drawableLeft) {
this.drawableLeft = drawableLeft;
invalidate();
}
/**
* 设置左侧图片并重绘
*/
public void setDrawableLeft(int drawableLeftRes) {
this.drawableLeft = mContext.getResources().getDrawable(drawableLeftRes);
invalidate();
}
/**
* 设置右侧图片并重绘
*/
public void setDrawableRight(Drawable drawableRight) {
this.drawableRight = drawableLeft;
invalidate();
}
/**
* 设置右侧图片并重绘
*/
public void setDrawableRight(int drawableRightRes) {
this.drawableRight = mContext.getResources().getDrawable(drawableRightRes);
invalidate();
}
/**
* 设置上部图片并重绘
*/
public void setDrawable(Drawable drawableTop) {
this.drawableTop = drawableTop;
invalidate();
}
/**
* 设置右侧图片并重绘
*/
public void setDrawableTop(int drawableTopRes) {
this.drawableTop = mContext.getResources().getDrawable(drawableTopRes);
invalidate();
}
}
其中attrs.xml中属性定义如下：
在xml中使用方法如下：
android:layout_width=”0dp”
android:layout_height=”wrap_content”
android:layout_weight=”1”
android:drawablePadding=”17dp”
android:gravity=”center”
android:text=”@string/xxx”
android:textSize=”16dp”
app:topDrawable=”@mipmap/xxx”
app:topDrawableHeight=”67dp”
app:topDrawableWidth=”67dp” />
矫情吗；*
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