Android 帶箭頭的指引tipLayout實(shí)現(xiàn)示例代碼

2019-10-22 18:16:33

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本文介紹了 Android 帶箭頭的指引tipLayout實(shí)現(xiàn)示例代碼，分享給大家，具體如下：

Android,指引箭頭,tipLayout

如上是從UI接過來的設(shè)計(jì)圖，要求三角形指示器需要動態(tài)對齊上面的文本，需要動態(tài)的實(shí)現(xiàn)對其三角形。

引用方式

compile 'com.xiaowei:TriangleTipLayout:1.0.0'

實(shí)現(xiàn)思路

準(zhǔn)備一個三角形指引的圖片即可。

先上代碼

final TextPaint textPaint = mTextView.getPaint();    final int textHeight = (int) (textPaint.descent() - textPaint.ascent());    mRect.set(0, DEFAULT_TOP_HEIGHT, getWidth(), getHeight() + textHeight - DEFAULT_TOP_HEIGHT);    canvas.drawRect(mRect, mRectPaint);    final String text = mTextView.getText().toString();    float left = 0;    if (mIsShowTriangle) {      if (mGravity == Gravity.LEFT || mGravity == Gravity.START) {        LayoutParams layoutParams = (LayoutParams) mTarget.getLayoutParams();        left = mTarget.getLeft() - layoutParams.rightMargin - layoutParams.leftMargin;      } else {        if (mTarget instanceof TextView) {          ViewParent viewParent = mTarget.getParent();          float textWidth = textPaint.measureText(text);          if (viewParent instanceof LinearLayout) {            final float width = mTarget.getWidth() / 2;            left = mTarget.getLeft() + width - (mBitmap.getWidth() / 2);          } else if (viewParent instanceof RelativeLayout) {            left = mTarget.getLeft() + textWidth / 2;          }        } else if (mTarget instanceof ImageView) {          final float width = mTarget.getWidth();          left = mTarget.getLeft() + (width / 2) - (mBitmap.getWidth() / 2);        }      }      canvas.drawBitmap(mBitmap, left, 0, mBitmapPaint);    }  }

核心代碼如上,其思路是先繪制一個矩形，預(yù)留出三角形所需要的高度，最后將其三行圖片繪制出來。

配置指示器

mTipsLayout.setRectBackgroundColor(Color.parseColor("#FFF8BE"));    mTipsLayout.setTextColor(Color.parseColor("#FF9B33"));    mTipsLayout.setTriangleBitmap(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_triangle_arrow));    mTipsLayout.setTriangleGravity(Gravity.START);    mTipsLayout.bindView(findViewById(R.id.text2));    mTipsLayout.setText("您今日收入已到達(dá)10W+，牛逼。保持努力");

注意：當(dāng)調(diào)用setText之后會invalidate()重新繪制;

實(shí)現(xiàn)效果如下

Android,指引箭頭,tipLayout