Android 修改系统关机动画的实现

     在android 系统移植做自己的移动设备，肯定会遇到更改开机或者关机画面，配置自己产品logo 这点是必须的，这些都要在源码中修改，然后编译，下面给大家介绍个关机动画修改，一个简单示例！

文件路径：frameworks\base\services\core\java\com\android\server\power\shutdownthread.java

在beginshutdownsequence()方法中：

private static void beginshutdownsequence(context context) {
  ...... 3   // throw up an indeterminate system dialog to indicate radio is
  // shutting down.
  //*********************** 系统默认的dialog  ***********************
  /*progressdialog pd = new progressdialog(context);
  pd.settitle(context.gettext(com.android.internal.r.string.power_off));
  pd.setmessage(context.gettext(com.android.internal.r.string.shutdown_progress));
  pd.setindeterminate(true);
  pd.setcancelable(false);
  pd.getwindow().settype(windowmanager.layoutparams.type_keyguard_dialog);
  pd.show();*/
  //*********************** 替换为自定义的全屏dialog  ***********************
  point outsize = new point();
  dialog dialog = new dialog(context, android.r.style.theme_black_notitlebar_fullscreen);
  indeterminateprogressbar view = new indeterminateprogressbar(context);
  dialog.getwindow().settype(windowmanager.layoutparams.type_keyguard_dialog);
  dialog.getwindow().getwindowmanager().getdefaultdisplay().getsize(outsize); //获取屏幕宽高
  dialog.setcontentview(view, new layoutparams(outsize.x, outsize.y));     //设置自定义view宽高为全屏
  dialog.show();
  
  ......
}

注意：必须要设置 dialog.getwindow().settype(windowmanager.layoutparams.type_keyguard_dialog); 之前忘了加导致什么都不显示 

替换的自定义view：

class indeterminateprogressbar extends view {
  static final string tag = "progressbar";
  private int delaymillis = 30;
  private handler mhandler;
  private arraylist<entity> entities;
  private int width = 0;
  // private int height = 0;
  private int r = 15;
  private int shift = 20;
  private int radius = 3;
  private int color = color.white;
  private long time = 0;
  private boolean started = false;
  public indeterminateprogressbar(context context) {
    super(context);
    init();
  }
  @override
  protected void onlayout(boolean changed, int left, int top, int right,
      int bottom) {
    super.onlayout(changed, left, top, right, bottom);
    width = getlayoutparams().width / 2;
    // height = getlayoutparams().height;
    if (width > 0) {
      radius = width / 20;
      r = 2 * width / 5;
      //shift = width / 2;
      shift = width / 1;
    }
  }
  private void init() {
    setbackgroundresource(android.r.color.transparent);
    mhandler = new handler(new handler.callback() {
      @override
      public boolean handlemessage(message msg) {
        for (entity e : entities) {
          e.update();
        }
        invalidate();
        mhandler.sendemptymessagedelayed(0, delaymillis);
        time += delaymillis;
        return false;
      }
    });
  }
  public void setcolor(int color) {
    this.color = color;
  }
  public void stop() {
    mhandler.removemessages(0);
    started = false;
    invalidate();
  }
  public boolean isstart() {
    return started;
  }
  public void start() {
    if (started)
      return;
    started = true;
    time = 0;
    entities = new arraylist<indeterminateprogressbar.entity>();
    float s = .25f;
    entities.add(new entity(0, color, 0));
    entities.add(new entity(1 * s, color, delaymillis * 4));
    entities.add(new entity(2 * s, color, delaymillis * 8));
    entities.add(new entity(3 * s, color, delaymillis * 12));
    entities.add(new entity(4 * s, color, delaymillis * 16));
    // entities.add(new entity(5 * s, color, delaymillis * 20));
      if (mhandler != null)
        mhandler.sendemptymessage(0);
    }
    @override
    protected void ondraw(canvas canvas) {
      if (entities != null && entities.size() > 0) {
        for (entity e : entities) {
          e.draw(canvas);
        }
      }
      super.ondraw(canvas);
    }
    class entity {
      private float x;
      private float y;
      private int color;
      private paint paint;
      private double sp = 0;
      private long delay;
      private int sec = 0;
      private float pec = 0;
      boolean visiable = true;
      public float getinterpolation(float input) {
        return (float) (math.cos((input + 1) * math.pi) / 2.0f) + 0.5f;
      }
      public entity(float sp, int color, int delay) {
        paint = new paint();
        paint.setantialias(true);
        paint.setstyle(paint.style.fill);
        this.color = color;
        this.sp = sp;
        this.delay = delay;
        paint.setcolor(this.color);
      }
      public void update() {
        if (time < delay)
          return;
        visiable = true;
        pec += 0.03;
        if (pec > 1) {
          pec = 0;
          sec = ++sec == 3 ? 0 : sec;
          delay = sec == 0 ? time + delaymillis * 22 : time + delaymillis
              * 3;
          visiable = sec == 0 ? false : true;
        }
        double θ = math.pi
            * .5
            + (sec == 0 ? 0 : sec * math.pi / sec)
            - (sec == 0 ? 0 : sp)
            + (math.pi * (sec == 1 ? 2 : 1) - (sec == 0 ? sp : 0) + (sec == 2 ? sp
                : 0)) * getinterpolation(pec);
        x = (float) (r / 2 * math.cos(θ)) + shift / 2;
        y = (float) (r / 2 * math.sin(θ)) + shift / 2;
      }
      public void draw(canvas canvas) {
        if (!visiable || x == 0 || y == 0)
          return;
        canvas.save();
        canvas.translate(x, y);
        canvas.drawcircle(x, y, radius, paint);
        canvas.restore();
      }
    }
    @override
    protected void onattachedtowindow() {
      super.onattachedtowindow();
      if (getvisibility() == view.visible) {
        start();
      }
    }
    @override
    protected void ondetachedfromwindow() {
      super.ondetachedfromwindow();
      stop();
    }
    public void setdelaymillis(int delaymillis) {
      this.delaymillis = delaymillis;
    }
}

效果图：

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