Android自定义时间轴的实现过程

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package com.example.time;

import java.util.Random;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;

public class TimeView extends View {

 private Random random;
 private String time;
 private Rect mBounds = new Rect();
 private int rgb;
 public TimeView(Context context, AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 initView();
 }

 public TimeView(Context context, AttributeSet attrs) {
 super(context, attrs);
 initView();
 }

 public TimeView(Context context) {
 super(context);
 initView();
 }

 private void initView() {

 random = new Random();
 //定义颜色---这里纯粹为了好玩--大家定义的时候可以在自定义控件外边定义，将颜色传递进来
 rgb = Color.rgb(100+random.nextInt(155), 100+random.nextInt(155),
 random.nextInt(100+155));

 }

 public void setTime(String time) {
 this.time = time;
 invalidate();

 }

 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 Paint paint = new Paint();
 paint.setColor(rgb);
 paint.setAntiAlias(true);
 paint.setStyle(Style.FILL_AND_STROKE);
 //先绘制圆
 canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2,
 paint);
 paint = new Paint();
 paint.setColor(Color.BLACK);
 paint.setTextSize(30);
 paint.getTextBounds(time, 0, time.length(), mBounds);
 float textWidth = mBounds.width();
 float textHeight = mBounds.height();
 //再绘制文字
 canvas.drawText(time, getWidth() / 2 - textWidth / 2, getHeight() / 2
 + textHeight / 2, paint);
 }

}

public class MainActivity extends Activity {

 private ListView listView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 listView = (ListView) findViewById(R.id.listView);
 initData();
 listView.setAdapter(new MyBaseAdapter());
 }

 class MyBaseAdapter extends BaseAdapter {

 @Override
 public int getCount() {
 return dataList.size();
 }

 @Override
 public Object getItem(int arg0) {
 return dataList.get(arg0);
 }

 @Override
 public long getItemId(int arg0) {
 return arg0;
 }

 @Override
 public View getView(int arg0, View arg1, ViewGroup arg2) {

 View view = View.inflate(MainActivity.this, R.layout.item, null);
 TextView tv_cOntent= (TextView) view.findViewById(R.id.tv_content);
 TextView tv_time = (TextView) view.findViewById(R.id.tv_time);
 TimeView timeView = (TimeView) view.findViewById(R.id.timeView);
 timeView.setTime(dataList.get(arg0).getTime());
 tv_content.setText(dataList.get(arg0).getContent());
 tv_time.setText(dataList.get(arg0).getTime());

 return view;
 }

 }

 ArrayList dataList = new ArrayList();

 private void initData() {
 for (int i = 0; i <20; i++) {
 dataList.add(new DataBean("哈哈哈哈" + i, "25/10"));
 }

 }

}