Android编程中TextView宽度过大导致Drawable无法居中问题解决方法

package com.example.testandroid; import java.lang.ref.WeakReference; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Rect; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.TextView; public class DrawableTextView extends TextView {  private WeakReference<Bitmap> normalReference;  private WeakReference<Bitmap> pressReference;  private WeakReference<Bitmap> showReference;  private int normalColor = Color.WHITE, pressColor = Color.WHITE;  private String text;  private int textWidth = 0;  private int textHeight = 0;  public DrawableTextView(Context context) {   super(context);  }  public DrawableTextView(Context context, AttributeSet attrs) {   super(context, attrs);  }  public DrawableTextView(Context context, AttributeSet attrs, int defStyle) {   super(context, attrs, defStyle);  }  @Override  protected void onFinishInflate() {   super.onFinishInflate();   initText();  }  private void initText() {   text = super.getText().toString();   initVariable();  }  /**   * 初始化，测量Textview内容的长度，高度   */  private void initVariable() {   textWidth = (int) (getPaint().measureText(text));   final Rect rect = new Rect();   getPaint().getTextBounds(text, 0, 1, rect);   textHeight = rect.height();  }  /**   * 设置TextView的内容   * @param text   */  public void setText(String text) {   this.text = text;   initVariable();   invalidate();  }  /**   * 获取TextView内容   */  public String getText() {   return text;  }  /**   * 设置TextView的Drawable内容，目前仅支持DrawableLeft   * @param normalDrawableId   *    DrawableLeft的normal状态Id   * @param pressDrawableId   *    DrawableLeft的press状态的Id（没有press状态，请传-1）   */  public void setDrawableLeftId(final int normalDrawableId, final int pressDrawableId) {   normalReference = new WeakReference<Bitmap>(BitmapFactory.decodeResource(getResources(), normalDrawableId));   if (pressDrawableId != -1) {    pressReference = new WeakReference<Bitmap>(BitmapFactory.decodeResource(getResources(), pressDrawableId));   }   showReference = normalReference;   invalidate();  }  /**   * 设置TextView的Color   * @param normalColor   *    TextView normal状态的Color值   * @param pressDrawableId   *    TextView press状态的Color值（如果没有press状态，请传与normal状态的值）   */  public void setTextColor(final int normalColor, final int pressColor) {   this.normalColor = normalColor;   this.pressColor = pressColor;   getPaint().setColor(normalColor);   initVariable();  }  @Override  protected void onDraw(Canvas canvas) {   if (showReference != null && showReference.get() != null) {    final int bitmapWidth = showReference.get().getWidth();    final int bitmapHeight = showReference.get().getHeight();    final int viewHeight = getHeight();    final int drawablePadding = getCompoundDrawablePadding();    final int start = (getWidth() - (bitmapWidth + drawablePadding + textWidth)) >> 1;    canvas.drawBitmap(showReference.get(), start, (viewHeight >> 1) - (bitmapHeight >> 1), getPaint());    /**     * 注意改方法，第三个参数y，本人也被误导了好久，原来在画文字的时候，y表示文字最后的位置（不是下笔点的起始位置）     * 所以为什么 是TextView高度的一半（中间位置） + 文字高度的一半 = 文字居中     */    canvas.drawText(text, start + drawablePadding + bitmapWidth, (viewHeight >> 1) + (textHeight >> 1), getPaint());   }  }  @Override  public boolean onTouchEvent(MotionEvent event) {   if (event.getAction() == MotionEvent.ACTION_DOWN) {    if (pressReference != null && pressReference.get() != null) {     showReference = pressReference;    }    getPaint().setColor(pressColor);   } else if (event.getAction() == MotionEvent.ACTION_UP) {    if (normalReference != null && normalReference.get() != null) {     showReference = normalReference;    }    getPaint().setColor(normalColor);   }   invalidate();   return super.onTouchEvent(event);  } }

<com.example.testandroid.DrawableTextView android:id="@+id/my_textview" android:layout_width="fill_parent" android:layout_marginTop="20dp" android:background="@drawable/text_selector" android:drawablePadding="8dp" android:textColor="@color/standard_orange" android:layout_height="wrap_content" android:padding="15dp" android:textSize="16sp" android:text="有Drawable的TextView" />

DrawableTextView drawableTextView = (DrawableTextView) getView().findViewById(R.id.my_textview);drawableTextView.setDrawableLeftId(R.drawable.bg_btn_delete_normal, R.drawable.bg_btn_delete_pressed);drawableTextView.setTextColor(getResources().getColor(R.color.standard_orange), getResources().getColor(R.color.standard_white));drawableTextView.setText("我在动态修改Text啦");

@Override protected void onDraw(Canvas canvas) {  Drawable[] drawables = getCompoundDrawables();  if (drawables != null) {   Drawable drawableLeft = drawables[0];   if (drawableLeft != null) {    final float textWidth = getPaint().measureText(getText().toString());    final int drawablePadding = getCompoundDrawablePadding();    final int drawableWidth = drawableLeft.getIntrinsicWidth();    final float bodyWidth = textWidth + drawableWidth + drawablePadding;    canvas.translate((getWidth() - bodyWidth) / 2, 0);   }  }  super.onDraw(canvas); }

<com.example.testandroid.DrawableTextView android:id="@+id/my_textview" android:layout_width="fill_parent" android:layout_marginTop="20dp" android:background="@drawable/text_selector" android:drawablePadding="8dp" android:drawableLeft="@drawable/clear_edittext_selector" android:textColor="@color/text_color_selector" android:layout_height="wrap_content" android:padding="15dp" android:textSize="16sp" android:text="有Drawable的TextView" />