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 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();

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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