Android自定义View实现垂直时间轴布局

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package com.jackie.timeline; 
 
import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.graphics.Paint; 
import android.graphics.drawable.BitmapDrawable; 
import android.support.annotation.Nullable; 
import android.util.AttributeSet; 
import android.view.View; 
import android.widget.LinearLayout; 
 
/** 
 * Created by Jackie on 2017/3/8. 
 * 时间轴控件 
 */ 
 
public class TimelineLayout extends LinearLayout { 
 private Context mContext; 
 
 private int mLineMarginLeft; 
 private int mLineMarginTop; 
 private int mLineStrokeWidth; 
 private int mLineColor;; 
 private int mPointSize; 
 private int mPointColor; 
 private Bitmap mIcon; 
 
 private Paint mLinePaint; //线的画笔 
 private Paint mPointPaint; //点的画笔 
  
 
 //第一个点的位置 
 private int mFirstX; 
 private int mFirstY; 
 //最后一个图标的位置 
 private int mLastX; 
 private int mLastY; 
 
 public TimelineLayout(Context context) { 
  this(context, null); 
 } 
 
 public TimelineLayout(Context context, @Nullable AttributeSet attrs) { 
  this(context, attrs, 0); 
 } 
 
 public TimelineLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { 
  super(context, attrs, defStyleAttr); 
  TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TimelineLayout); 
  mLineMarginLeft = ta.getDimensionPixelOffset(R.styleable.TimelineLayout_line_margin_left, 10); 
  mLineMarginTop = ta.getDimensionPixelOffset(R.styleable.TimelineLayout_line_margin_top, 0); 
  mLineStrokeWidth = ta.getDimensionPixelOffset(R.styleable.TimelineLayout_line_stroke_width, 2); 
  mLineColor = ta.getColor(R.styleable.TimelineLayout_line_color, 0xff3dd1a5); 
  mPointSize = ta.getDimensionPixelSize(R.styleable.TimelineLayout_point_size, 8); 
  mPointColor = ta.getDimensionPixelOffset(R.styleable.TimelineLayout_point_color, 0xff3dd1a5); 
 
  int icOnRes= ta.getResourceId(R.styleable.TimelineLayout_icon_src, R.drawable.ic_ok); 
  BitmapDrawable drawable = (BitmapDrawable) context.getResources().getDrawable(iconRes); 
  if (drawable != null) { 
   mIcon = drawable.getBitmap(); 
  } 
 
  ta.recycle(); 
 
  setWillNotDraw(false); 
  initView(context); 
 } 
 
 private void initView(Context context) { 
  this.mCOntext= context; 
 
  mLinePaint = new Paint(); 
  mLinePaint.setAntiAlias(true); 
  mLinePaint.setDither(true); 
  mLinePaint.setColor(mLineColor); 
  mLinePaint.setStrokeWidth(mLineStrokeWidth); 
  mLinePaint.setStyle(Paint.Style.FILL_AND_STROKE); 
 
  mPointPaint = new Paint(); 
  mPointPaint.setAntiAlias(true); 
  mPointPaint.setDither(true); 
  mPointPaint.setColor(mPointColor); 
  mPointPaint.setStyle(Paint.Style.FILL); 
 } 
 
 @Override 
 protected void onDraw(Canvas canvas) { 
  super.onDraw(canvas); 
   
  drawTimeline(canvas); 
 } 
 
 private void drawTimeline(Canvas canvas) { 
  int childCount = getChildCount(); 
 
  if (childCount > 0) { 
   if (childCount > 1) { 
    //大于1，证明至少有2个，也就是第一个和第二个之间连成线，第一个和最后一个分别有点和icon 
    drawFirstPoint(canvas); 
    drawLastIcon(canvas); 
    drawBetweenLine(canvas); 
   } else if (childCount == 1) { 
    drawFirstPoint(canvas); 
   } 
  } 
 } 
 
 private void drawFirstPoint(Canvas canvas) { 
  View child = getChildAt(0); 
  if (child != null) { 
   int top = child.getTop(); 
   mFirstX = mLineMarginLeft; 
   mFirstY = top + child.getPaddingTop() + mLineMarginTop; 
 
   //画圆 
   canvas.drawCircle(mFirstX, mFirstY, mPointSize, mPointPaint); 
  } 
 } 
 
 private void drawLastIcon(Canvas canvas) { 
  View child = getChildAt(getChildCount() - 1); 
  if (child != null) { 
   int top = child.getTop(); 
   mLastX = mLineMarginLeft; 
   mLastY = top + child.getPaddingTop() + mLineMarginTop; 
 
   //画图 
   canvas.drawBitmap(mIcon, mLastX - (mIcon.getWidth() >> 1), mLastY, null); 
  } 
 } 
 
 private void drawBetweenLine(Canvas canvas) { 
  //从开始的点到最后的图标之间，画一条线 
  canvas.drawLine(mFirstX, mFirstY, mLastX, mLastY, mLinePaint); 
  for (int i = 0; i 

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package com.jackie.timeline; 
 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
 
public class MainActivity extends AppCompatActivity implements View.OnClickListener { 
 private Button addItemButton; 
 private Button subItemButton; 
 private Button addMarginButton; 
 private Button subMarginButton; 
 private TextView mCurrentMargin; 
 
 private TimelineLayout mTimelineLayout; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
 
  initView(); 
 } 
 
 private void initView() { 
  addItemButton = (Button) findViewById(R.id.add_item); 
  subItemButton = (Button) findViewById(R.id.sub_item); 
  addMarginButton= (Button) findViewById(R.id.add_margin); 
  subMarginButton= (Button) findViewById(R.id.sub_margin); 
  mCurrentMargin= (TextView) findViewById(R.id.current_margin); 
  mTimelineLayout = (TimelineLayout) findViewById(R.id.timeline_layout); 
 
  addItemButton.setOnClickListener(this); 
  subItemButton.setOnClickListener(this); 
  addMarginButton.setOnClickListener(this); 
  subMarginButton.setOnClickListener(this); 
 } 
 
 private int index = 0; 
 private void addItem() { 
  View view = LayoutInflater.from(this).inflate(R.layout.item_timeline, mTimelineLayout, false); 
  ((TextView) view.findViewById(R.id.tv_action)).setText("步骤" + index); 
  ((TextView) view.findViewById(R.id.tv_action_time)).setText("2017年3月8日16:55:04"); 
  ((TextView) view.findViewById(R.id.tv_action_status)).setText("完成"); 
  mTimelineLayout.addView(view); 
  index++; 
 } 
 
 private void subItem() { 
  if (mTimelineLayout.getChildCount() > 0) { 
   mTimelineLayout.removeViews(mTimelineLayout.getChildCount() - 1, 1); 
   index--; 
  } 
 } 
 
 @Override 
 public void onClick(View v) { 
  switch (v.getId()){ 
   case R.id.add_item: 
    addItem(); 
    break; 
   case R.id.sub_item: 
    subItem(); 
    break; 
   case R.id.add_margin: 
    int currentMargin = UIHelper.pxToDip(this, mTimelineLayout.getLineMarginLeft()); 
    mTimelineLayout.setLineMarginLeft(UIHelper.dipToPx(this, ++currentMargin)); 
    mCurrentMargin.setText("current line margin left is " + currentMargin + "dp"); 
    break; 
   case R.id.sub_margin: 
    currentMargin = UIHelper.pxToDip(this, mTimelineLayout.getLineMarginLeft()); 
    mTimelineLayout.setLineMarginLeft(UIHelper.dipToPx(this, --currentMargin)); 
    mCurrentMargin.setText("current line margin left is " + currentMargin + "dp"); 
    break; 
   default: 
    break; 
  } 
 } 
} 

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package com.jackie.timeline; 
 
import android.content.Context; 
 
/** 
 * Created by Jackie on 2017/3/8. 
 */ 
public final class UIHelper { 
 
 private UIHelper() throws InstantiationException { 
  throw new InstantiationException("This class is not for instantiation"); 
 } 
 
 /** 
  * dip转px 
  */ 
 public static int dipToPx(Context context, float dip) { 
  return (int) (dip * context.getResources().getDisplayMetrics().density + 0.5f); 
 } 
 
 /** 
  * px转dip 
  */ 
 public static int pxToDip(Context context, float pxValue) { 
  final float scale = context.getResources().getDisplayMetrics().density; 
  return (int) (pxValue / scale + 0.5f); 
 } 
}