如何正确理解和使用Activity的4种启动模式

publicclassRing_Slide2extendsView {

 privatestaticfinaldoubleRADIAN =180/ Math.PI;

 privateintmax_progress;// 设置最大进度

 privateintcur_progress;//设置锚点1当前进度

 privateintcur_progress2;//设置锚点2进度

 privateintbottom_color;//设置底色

 privateintcircle_color;//设置圆的颜色（锚点）

 privateintslide_color;//设置滑动过的颜色

 privatefloatring_width;//圆环的宽度

 privatedoublecur_Angle;//当前锚点1旋转角度

 privatedoublecur_Angle2;//当前锚点2的旋转角度

 privatefloatring_Radius;//圆环的半径

 privatefinalint[] arrColorCircle =newint[]{0xFFFFde37,0xFFFFa400};

 privateintmain_width;//圆的宽度

 privatefloatmWheelCurX, mWheelCurY;//圆的位置

 privatefloatmWheelCurX2, mWheelCurY2;//圆2的位置

 privatePaint circle_Paint;//圆环的画笔

 privatePaint select_Paint;//选中的画笔

 privatePaint dot1;//圆点1

 privatePaint dot2;//圆点2

 privateContext context;

 privateOnSeekBarChangeListener changeListener,changeListener2;

 publicRing_Slide2(Context context) {

  this(context,null);

 }

 publicRing_Slide2(Context context, AttributeSet attrs) {

  this(context, attrs,0);

 }

 publicRing_Slide2(Context context, AttributeSet attrs,intdefStyleAttr) {

  super(context, attrs, defStyleAttr);

  this.context=context;

  initAttrs(attrs,defStyleAttr);

  initPadding();

  //初始化画笔

  initPaints();

 }

 //初始化属性

 privatevoidinitAttrs(AttributeSet attrs,intdefStyle){

  TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.Cricle_slide, defStyle,0);

  max_progress=typedArray.getInt(R.styleable.Cricle_slide_max_progress,720);

  cur_progress=typedArray.getInt(R.styleable.Cricle_slide_cur_progress,420);

  cur_progress2=typedArray.getInt(R.styleable.Cricle_slide_cur_progress2,540);

  if(cur_progress > max_progress) cur_progress = max_progress;

  if(cur_progress2 > max_progress) cur_progress2 = max_progress;

  Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), R.mipmap.select_sun_bg2);

  main_width= bitmap.getWidth();

  ring_width=typedArray.getFloat(R.styleable.Cricle_slide_Ring_Width,main_width);

  bottom_color=typedArray.getColor(R.styleable.Cricle_slide_bottom_color,getColor(R.color.select_main_bg_color));

  circle_color=typedArray.getColor(R.styleable.Cricle_slide_circle_color,getColor(R.color.duration));

  slide_color=typedArray.getColor(R.styleable.Cricle_slide_slide_color,getColor(R.color.time));

  typedArray.recycle();

 }

 //初始化边距

 privatevoidinitPadding(){

  intpaddingLeft = getPaddingLeft();

  intpaddingTop = getPaddingTop();

  intpaddingRight = getPaddingRight();

  intpaddingBottom = getPaddingBottom();

  intpaddingStart =0, paddingEnd =0;

  if(Build.VERSION.SDK_INT >=17) {

   paddingStart = getPaddingStart();

   paddingEnd = getPaddingEnd();

  }

  intmaxPadding = Math.max(paddingLeft, Math.max(paddingTop,

    Math.max(paddingRight, Math.max(paddingBottom, Math.max(paddingStart, paddingEnd)))));

  setPadding(maxPadding, maxPadding, maxPadding, maxPadding);

 }

 privatevoidinitPaints(){

  /*

  圆环的画笔

   */

  circle_Paint=new Paint(Paint.ANTI_ALIAS_FLAG);

  circle_Paint.setAntiAlias(true);

  circle_Paint.setColor(bottom_color);

  circle_Paint.setStyle(Paint.Style.STROKE);

  circle_Paint.setStrokeWidth(ring_width);

  /*

  选中区域的画笔

   */

  select_Paint=new Paint(Paint.ANTI_ALIAS_FLAG);

  select_Paint.setShader(new SweepGradient(0, 0, arrColorCircle, null));

  /*select_Paint.setColor(circle_color);*/

  select_Paint.setAntiAlias(true);

  select_Paint.setStyle(Paint.Style.STROKE);

  select_Paint.setStrokeWidth(ring_width);

  // 画锚点

  dot1 = new Paint(Paint.ANTI_ALIAS_FLAG);

  dot1.setColor(circle_color);

  dot1.setAntiAlias(true);

  dot1.setStyle(Paint.Style.FILL);

  // 画锚点2

  dot2 = new Paint(Paint.ANTI_ALIAS_FLAG);

  dot2.setColor(slide_color);

  dot2.setAntiAlias(true);

  dot2.setStyle(Paint.Style.FILL);

 }

 //获取宽度

 private float getDimen(int dimenId) {

  return getResources().getDimension(dimenId);

 }

 //获取颜色

 @TargetApi(Build.VERSION_CODES.M)

 private int getColor(int colorId) {

  final int version = Build.VERSION.SDK_INT;

  if (version >= 23) {

   return getContext().getColor(colorId);

  } else {

   return ContextCompat.getColor(getContext(), colorId);

  }

 }

 @Override

 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

  super.onMeasure(widthMeasureSpec, heightMeasureSpec);

  Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), R.mipmap.setalarm_colock_bg);

  int height = bitmap.getHeight()+main_width*2;

  int width = bitmap.getWidth()+main_width*2;

  int min = Math.min(height, width);

  setMeasuredDimension(min,min);

  initposition();

 }

 private void initposition(){

  //转换为360度

  cur_Angle=(double) cur_progress / max_progress*360.0;

  cur_Angle2=(double)cur_progress2 / max_progress*360.0;

  //计算初始化旋转的角度

  double cos = -Math.cos(Math.toRadians(cur_Angle));

  double cos2 = -Math.cos(Math.toRadians(cur_Angle2));

  //根据旋转的角度来确定位置

  MakeCurPosition(cos);

  MakeCurPosition2(cos2);

  //确定圆环的半径

  ring_Radius=(getMeasuredWidth() - getPaddingLeft() - getPaddingRight() - ring_width) / 2;

 }

 private void MakeCurPosition(double cos){

  //根据旋转的角度来确定圆的位置

  //确定x点的坐标

  mWheelCurX = calcXLocationInWheel(cur_Angle, cos);

  //确定y点的坐标

  mWheelCurY=calcYLocationInWheel(cos);

 }

 private void MakeCurPosition2(double cos2){

  //根据旋转的角度来确定圆的位置

  //确定x点的坐标

  mWheelCurX2 = calcXLocationInWheel(cur_Angle2, cos2);

  //确定y点的坐标

  mWheelCurY2=calcYLocationInWheel(cos2);

 }

 //确定x点的坐标

 private float calcXLocationInWheel(double angle,double cos){

  if (angle < 180) {

   return (float) (getMeasuredWidth() / 2 + Math.sqrt(1 - cos * cos) * ring_Radius); //Math.sqrt正平分根 9-3

  } else {

   return (float) (getMeasuredWidth() / 2 - Math.sqrt(1 - cos * cos) * ring_Radius);

  }

 }

 //确定y点的坐标

 private float calcYLocationInWheel(double cos) {

  return getMeasuredWidth() / 2 + ring_Radius * (float) cos;

 }

 @Override

 protected void onDraw(Canvas canvas) {

  super.onDraw(canvas);

  float left = getPaddingLeft() + ring_width / 2;

  float top = getPaddingTop() + ring_width / 2;

  float right = canvas.getWidth() - getPaddingRight() - ring_width / 2;

  float bottom = canvas.getHeight() - getPaddingBottom() - ring_width / 2;

  float centerX = (left + right) / 2;

  float centerY = (top + bottom) / 2;

  float wheelRadius = (canvas.getWidth() - getPaddingLeft() - getPaddingRight()) / 2 - ring_width / 2;

  canvas.drawCircle(centerX, centerY, wheelRadius, circle_Paint);

  //画选中区域

  //  canvas.drawArc(new RectF(left, top, right, bottom), (float) (Math.PI *  RADIAN + Math.acos(cur_Angle) * RADIAN), (float)  (Math.abs(cur_Angle-cur_Angle2)), false, select_Paint);

  Log.i("TAG","第一个的角度="+cur_Angle);

  Log.i("TAG","第一个的角度2="+cur_Angle2);

  float begin=0; //圆弧的起点位置

  float stop=0;

  if(cur_Angle>180 && cur_Angle>cur_Angle2 ){ //180 -- 360

   begin=(float) (-Math.abs(cur_Angle-360)-90);

   stop=(float) Math.abs(Math.abs(cur_Angle-360)+cur_Angle2);

   Log.i("TAG","begin="+begin);

   Log.i("TAG","stop="+stop);

  }else if(cur_Angle>cur_Angle2){

   begin=(float) cur_Angle-90;

   stop=(float)(360-(cur_Angle-cur_Angle2));

  }else {

    begin=(float) cur_Angle-90;

   stop=(float) Math.abs(cur_Angle-cur_Angle2);

  }

  canvas.drawArc(new RectF(left, top, right, bottom), begin,stop, false, select_Paint);

  //画锚点 画圆

  canvas.drawCircle(mWheelCurX, mWheelCurY, ring_width/2, dot1);

  //画锚点 画圆

  canvas.drawCircle(mWheelCurX2, mWheelCurY2, ring_width/2, dot2);

  Log.i("TAG","锚点1Y"+mWheelCurY+"锚点1X"+mWheelCurX);

  Log.i("TAG","锚点2Y"+mWheelCurY2+"锚点1X"+mWheelCurX2);

 }

 @Override

 public boolean onTouchEvent(MotionEvent event) {

  float x = event.getX();

  float y = event.getY();

  int flag=0;

  //判断是否触控到两个点中的其中某个点

  if(isMovedot2(x,y)){

   flag=2;

  }else if(isMovedot1(x,y)){

   flag=1;

  }

  /* if(isMovedot1(x,y)){

   flag=1;

  }else if(isMovedot2(x,y)){

   flag=2;

  }*/

  if(event.getAction()==MotionEvent.ACTION_MOVE || isMovedot1(x,y) ==true|| isMovedot2(x,y)==true){

   Log.i("TAG","进入X="+x+"进入Y="+y);

   //通过触摸点算出cos角度值

   floatcos = calculateCos(x, y);

   // 通过反三角函数获得角度值

   doubleangle;//获取滑动的角度

   if(x < getWidth() /2) {// 滑动超过180度

    angle = Math.PI * RADIAN + Math.acos(cos) * RADIAN;//通过计算得到滑动的角度值

   }else{// 没有超过180度

    angle = Math.PI * RADIAN - Math.acos(cos) * RADIAN;//PI 周长比直径 返回弧角度的余弦值

   }

   if(flag==1){

    cur_Angle=angle;

    cur_progress=getSelectedValue(cur_Angle);

    MakeCurPosition(cos);

    if(changeListener !=null) {

     changeListener.onChanged(this, cur_progress);

    }

   }elseif(flag==2){

    cur_Angle2=angle;

    cur_progress2=getSelectedValue(cur_Angle2);

    MakeCurPosition2(cos);

    if(changeListener2 !=null) {

     changeListener2.onChanged(this, cur_progress2);

    }

   }

   invalidate();

   returntrue;

  }else{

   returnsuper.onTouchEvent(event);

  }

 }

 privatebooleanisMovedot1(floatx,floaty){

  floatdot1x = Math.abs(mWheelCurX - x);

  floatdot1y = Math.abs(mWheelCurY - y);

  if(dot1x<30&& dot1y<30){

   returntrue;

  }else{

   returnfalse;

  }

 }

 privatebooleanisMovedot2(floatx,floaty){

  floatdot1x = Math.abs(mWheelCurX2 - x);

  floatdot1y = Math.abs(mWheelCurY2 - y);

  if(dot1x<30&& dot1y<30){

   returntrue;

  }else{

   returnfalse;

  }

 }

 //拿到切斜角的cos值

 privatefloatcalculateCos(floatx,floaty){

  floatwidth = x - getWidth() /2;

  floatheight = y - getHeight() /2;

  floatslope = (float) Math.sqrt(width * width + height * height);

  returnheight / slope;

 }

 privateintgetSelectedValue(doublemCurAngle) {//角度转进度

  returnMath.round(max_progress * ((float) mCurAngle /360));//四舍五入

 }

 publicvoidsetOnSeekBarChangeListener(OnSeekBarChangeListener listener) {

  changeListener = listener;

 }

 publicvoidsetOnSeekBarChangeListener2(OnSeekBarChangeListener listener) {

  changeListener2 = listener;

 }

 publicvoidinitRadian(intpro1,intpro2){

  this.cur_progress=pro1;

  this.cur_progress2=pro2;

  invalidate();

 }

 publicinterfaceOnSeekBarChangeListener {

  voidonChanged(Ring_Slide2 seekbar,intcurValue);

 }

}

 //设置最大进度

 //设置当前进度

 //设置当前进度

 //设置底色

 //设置圆的颜色

 //设置滑动的颜色

 //圆环的宽度 （dimension是代表尺寸值）

importandroid.app.ActionBar;

importandroid.app.Activity;

importandroid.app.FragmentTransaction;

importandroid.app.ActionBar.Tab;

importandroid.os.Bundle;

importandroid.os.CountDownTimer;

importandroid.view.MotionEvent;

importandroid.view.Window;

publicclassActionBarActivityextendsActivity {

  /** Called when the activity is first created. */

  @Override

  publicvoidonCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    //使ActionBar变得透明

    requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);

    setContentView(R.layout.main);

    finalActionBar actionBar = getActionBar();

    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    // remove the activity title to make space for tabs

    actionBar.setDisplayShowTitleEnabled(false);

    AFragment aFragment =newAFragment();

    actionBar.addTab(actionBar.newTab().setText("Tab-A")

        .setTabListener(newListenerA(aFragment)));

    BFragment bFragment =newBFragment();

    actionBar.addTab(actionBar.newTab().setText("Tab-B")

        .setTabListener(newListenerB(bFragment)));

  }

  //点击显示or隐藏ActionBar

  publicbooleanonTouchEvent(MotionEvent event){

    ActionBar bar = getActionBar();

    switch(event.getAction()){

      caseMotionEvent.ACTION_UP:

        if(bar.isShowing()) bar.hide();

        elsebar.show();

        break;

      default:

          break;

    }

    returntrue;

  }

  privateclassListenerAimplementsActionBar.TabListener {

    privateAFragment mFragment;

    // Called to create an instance of the listener when adding a new tab

    publicListenerA(AFragment fragment) {

      mFragment = fragment;

    }

    publicvoidonTabSelected(Tab tab, FragmentTransaction ft) {

      ft.add(R.id.fragment, mFragment,null);

    }

    publicvoidonTabUnselected(Tab tab, FragmentTransaction ft) {

      ft.remove(mFragment);

    }

    publicvoidonTabReselected(Tab tab, FragmentTransaction ft) {

      // do nothing }

    }

  }

  privateclassListenerBimplementsActionBar.TabListener {

    privateBFragment mFragment;

    // Called to create an instance of the listener when adding a new tab

    publicListenerB(BFragment fragment) {

      mFragment = fragment;

    }

    publicvoidonTabSelected(Tab tab, FragmentTransaction ft) {

      ft.add(R.id.fragment, mFragment,null);

    }

    publicvoidonTabUnselected(Tab tab, FragmentTransaction ft) {

      ft.remove(mFragment);

    }

    publicvoidonTabReselected(Tab tab, FragmentTransaction ft) {

      // do nothing }

    }

  }

}

publicclassAFragmentextendsFragment {

  publicView onCreateView(LayoutInflater inflater, ViewGroup container,

      Bundle savedInstanceState) {

    returninflater.inflate(R.layout.alayout, container,false);

    }

}

newAlertDialog.Builder(EX03_12.this)

.setTitle(R.string.app_about)

.setMessage(R.string.app_about_msg)

.setPositiveButton(R.string.str_ok,

  newDialogInterface.OnClickListener()

  {

  publicvoidonClick(DialogInterface dialoginterface,inti)

  {

  }

  }).show();

/*使用系统标准的 makeText()方式来产生Toast讯息*/

Toast.makeText( EX04_03.this,String,Toast.LENGTH_LONG).show();