利用一个singleInstance的activity实现音乐播放器锁屏

1，首先需要自定义一个支持跟随手势滑动的布局SildingFinishLayout：

2，在activity里面使用，需要在清单文件进行如下配置：

android:name=".activity.LockScreenActivity"

android:excludeFromRecents="true"

android:exported="false"

android:launchMode="singleInstance"

android:noHistory="true"

android:screenOrientation="portrait"

android:taskAffinity="com.package.name.lockscreen"

android:theme="@style/LockScreenBase"/>

/////////自定义的SildingFinishLayout：

public classSildingFinishLayout2extendsRelativeLayoutimplements

View.OnTouchListener {

/**

* SildingFinishLayout布局的父布局

privateViewGroupmParentView;

/**

* 处理滑动逻辑的View

privateViewtouchView;

/**

* 滑动的最小距离

private intmTouchSlop;

/**

* 按下点的X坐标

private intdownX;

/**

* 按下点的Y坐标

private intdownY;

/**

* 临时存储X坐标

private inttempX;

/**

* 临时存储Y坐标

private inttempY;

/**

* 滑动类

privateScrollermScroller;

/**

* SildingFinishLayout的宽度

private intviewWidth;

/**

* SildingFinishLayout的高度

private intviewHeight;

/**

* 记录是否正在滑动

private booleanisSilding;

privateOnSildingFinishListeneronSildingFinishListener;

private booleanisFinish;

publicSildingFinishLayout2(Context context,AttributeSet attrs) {

this(context,attrs,0);

}

publicSildingFinishLayout2(Context context,AttributeSet attrs, intdefStyle) {

super(context,attrs,defStyle);

mTouchSlop= ViewConfiguration.get(context).getScaledTouchSlop();

mScroller=newScroller(context);

}

@Override

protected voidonLayout(booleanchanged, intl, intt, intr, intb) {

super.onLayout(changed,l,t,r,b);

if(changed) {

// 获取SildingFinishLayout所在布局的父布局

mParentView= (ViewGroup)this.getParent();

viewWidth=this.getWidth();

viewHeight=this.getHeight();

}

/**

* 设置OnSildingFinishListener, 在onSildingFinish()方法中finish Activity

*@paramonSildingFinishListener

public voidsetOnSildingFinishListener(

OnSildingFinishListener onSildingFinishListener) {

this.onSildingFinishListener= onSildingFinishListener;

}

/**

* 设置Touch的View

*@paramtouchView

public voidsetTouchView(View touchView) {

this.touchView= touchView;

touchView.setOnTouchListener(this);

}

publicViewgetTouchView() {

returntouchView;

}

/**

* 滚动出界面

private voidscrollRight() {

final intdelta = (viewHeight+mParentView.getScrollY());

mScroller.startScroll(0,mParentView.getScrollY(),0,delta +1,

Math.abs(delta));

postInvalidate();

}

/**

* 滚动到起始位置

private voidscrollOrigin() {

intdelta =mParentView.getScrollY();

mScroller.startScroll(0,mParentView.getScrollY(),0,-delta,

Math.abs(delta));

postInvalidate();

}

/**

* touch的View是否是AbsListView，例如ListView, GridView等其子类

*@return

private booleanisTouchOnAbsListView() {

returntouchViewinstanceofAbsListView ?true:false;

}

/**

* touch的view是否是ScrollView或者其子类

*@return

private booleanisTouchOnScrollView() {

returntouchViewinstanceofScrollView ?true:false;

}

@Override

public booleanonTouch(View v,MotionEvent event) {

switch(event.getAction()) {

caseMotionEvent.ACTION_DOWN:

downX=tempX= (int) event.getRawX();

downY=tempY= (int) event.getRawY();

break;

caseMotionEvent.ACTION_MOVE:

intmoveX = (int) event.getRawX();

intmoveY = (int) event.getRawY();

intdeltaX =tempX- moveX;

intdeltaY =tempY- moveY;

tempX= moveX;

tempY= moveY;

/* if (Math.abs(moveX - downX) > mTouchSlop

&& Math.abs((int) event.getRawY() - downY) < mTouchSlop) {

isSilding = true;*/

if(Math.abs(moveY -downY)

&& Math.abs((int) event.getRawX() -downX)

isSilding=true;

// 若touchView是AbsListView，

// 则当手指滑动，取消item的点击事件，不然我们滑动也伴随着item点击事件的发生

if(isTouchOnAbsListView()) {

MotionEvent cancelEvent = MotionEvent.obtain(event);

cancelEvent

.setAction(MotionEvent.ACTION_CANCEL

| (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));

v.onTouchEvent(cancelEvent);

}

if(moveY -downY<=0&&isSilding) {

mParentView.scrollBy(0,deltaY);

// 屏蔽在滑动过程中ListView ScrollView等自己的滑动事件

if(isTouchOnScrollView() || isTouchOnAbsListView()) {

return true;

}

break;

caseMotionEvent.ACTION_UP:

isSilding=false;

if(mParentView.getScrollY() >=viewHeight/4) {

isFinish=true;

scrollRight();

}else{

scrollOrigin();

isFinish=false;

}

break;

}

if(isTouchOnScrollView() || isTouchOnAbsListView()) {

returnv.onTouchEvent(event);

}

// 其他的情况直接返回true

return true;

}

@Override

public voidcomputeScroll() {

// 调用startScroll的时候scroller.computeScrollOffset()返回true，

if(mScroller.computeScrollOffset()) {

mParentView.scrollTo(mScroller.getCurrX(),mScroller.getCurrY());

postInvalidate();

// if (mScroller.isFinished()) {

if(onSildingFinishListener!=null&&isFinish) {

onSildingFinishListener.onSildingFinish();

}

// }

}

public interfaceOnSildingFinishListener {

public voidonSildingFinish();

}

////////Activity里的使用：

public class LockScreenActivity extends AppCompatActivity {

@Override

protected voidonCreate(BundlesavedInstanceState) {

super.onCreate(savedInstanceState);

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.activity_lock_screen);

this.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD| WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);

SildingFinishLayout2 mSildingFinishLayout = (SildingFinishLayout2) findViewById(R.id.sildingFinishLayout);

mSildingFinishLayout.setOnSildingFinishListener(newSildingFinishLayout2.OnSildingFinishListener() {

@Override

public voidonSildingFinish() {

finish();

}

});

mSildingFinishLayout.setTouchView(findViewById(R.id.rl));//这个布局必须是包含在SildingFinishLayout下的最外层布局

}

@Override

public voidonBackPressed() {

}

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