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android Launcher源码解析:DeleteZone
来源:互联网   发布日期:2016-01-06 19:26:44   浏览:3071次  

导读:DeleteZone是launcher中比较简单的一部分,其操作为长按桌面上某个图标后,会出现如下内容:1)dock栏消失;2)原dock栏位置出现一个垃圾箱图案;将该图标拖动到垃圾箱位...

DeleteZone是launcher中比较简单的一部分,其操作为

长按桌面上某个图标后,会出现如下内容:1)dock栏消失;2)原dock栏位置出现一个垃圾箱图案;

将该图标拖动到垃圾箱位置后,会发现如下内容:1)垃圾箱图标变为打开;2)垃圾箱周围出现一片红色区域;3)图标变为红色;

将该图标放到垃圾箱位置后,该图标会被从桌面中删除;

查看DeleteZone的源码,只要搞清楚了以上3个步骤是如何实现的,那么就理解了他的代码了。

1)构造函数

[java]

public DeleteZone(Context context, AttributeSet attrs) {

this(context, attrs, 0);

}

public DeleteZone(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

final int srcColor = context.getResources().getColor(R.color.delete_color_filter);

mTrashPaint.setColorFilter(new PorterDuffColorFilter(srcColor, PorterDuff.Mode.SRC_ATOP));

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DeleteZone, defStyle, 0);

mOrientation = a.getInt(R.styleable.DeleteZone_direction, ORIENTATION_HORIZONTAL);

a.recycle();

}

@Override

protected void onFinishInflate() {

super.onFinishInflate();

mTransition = (TransitionDrawable) getDrawable();

}

public DeleteZone(Context context, AttributeSet attrs) {

this(context, attrs, 0);

}

public DeleteZone(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

final int srcColor = context.getResources().getColor(R.color.delete_color_filter);

mTrashPaint.setColorFilter(new PorterDuffColorFilter(srcColor, PorterDuff.Mode.SRC_ATOP));

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DeleteZone, defStyle, 0);

mOrientation = a.getInt(R.styleable.DeleteZone_direction, ORIENTATION_HORIZONTAL);

a.recycle();

}

@Override

protected void onFinishInflate() {

super.onFinishInflate();

mTransition = (TransitionDrawable) getDrawable();

}这里主要完成三项工作:1)构造对象;2)建立红色区域的滤镜颜色为红色;3)判断方向,这个是在launcher.xml中设置的方向。

[html]

<com.xuxm.demo.launcher.DeleteZone

android:id="@+id/delete_zone"

android:layout_width="@dimen/delete_zone_size"

android:layout_height="@dimen/delete_zone_size"

android:paddingTop="@dimen/delete_zone_padding"

android:layout_gravity="top|center_horizontal"

android:scaleType="center"

<STRONG>android:src="@drawable/delete_zone_selector"</STRONG>

android:visibility="invisible"

<STRONG> launcher:direction="horizontal"</STRONG>

/>

<com.xuxm.demo.launcher.DeleteZone

android:id="@+id/delete_zone"

android:layout_width="@dimen/delete_zone_size"

android:layout_height="@dimen/delete_zone_size"

android:paddingTop="@dimen/delete_zone_padding"

android:layout_gravity="top|center_horizontal"

android:scaleType="center"

android:src="@drawable/delete_zone_selector"

android:visibility="invisible"

launcher:direction="horizontal"

/>同时需要注意到这里的图片并不是一张图片,而是一个TransitionDrawable,其内容为:

[html]

<transition xmlns:android="http://schemas.android.com/apk/res/android">

<item android:drawable="@drawable/trashcan"/>

<item android:drawable="@drawable/trashcan_hover"/>

</transition>

<transition xmlns:android="http://schemas.android.com/apk/res/android">

<item android:drawable="@drawable/trashcan"/>

<item android:drawable="@drawable/trashcan_hover"/>

</transition>

这里,他可以动态切换显示的图片,这也是你看到的垃圾箱关闭与打开两种显示方式的根源。其实现在这几个函数中实现:

[java]

public void onDragEnter(DragSource source, int x, int y, int xOffset, int yOffset,

DragView dragView, Object dragInfo) {

mTransition.reverseTransition(TRANSITION_DURATION);

dragView.setPaint(mTrashPaint);

}

public void onDragOver(DragSource source, int x, int y, int xOffset, int yOffset,

DragView dragView, Object dragInfo) {

}

public void onDragExit(DragSource source, int x, int y, int xOffset, int yOffset,

DragView dragView, Object dragInfo) {

mTransition.reverseTransition(TRANSITION_DURATION);

dragView.setPaint(null);

}

public void onDragEnter(DragSource source, int x, int y, int xOffset, int yOffset,

DragView dragView, Object dragInfo) {

mTransition.reverseTransition(TRANSITION_DURATION);

dragView.setPaint(mTrashPaint);

}

public void onDragOver(DragSource source, int x, int y, int xOffset, int yOffset,

DragView dragView, Object dragInfo) {

}

public void onDragExit(DragSource source, int x, int y, int xOffset, int yOffset,

DragView dragView, Object dragInfo) {

mTransition.reverseTransition(TRANSITION_DURATION);

dragView.setPaint(null);

}这里,当被拖动图标进入到DeleteZone区域时,图标变为垃圾箱打开中状态,如果图标离开了DeleteZone区域时,垃圾箱恢复为垃圾箱关闭状态;dragView.setPaint(mTrashPaint);这一句是设置被拖动图标显示为红色。

2)删除图标

当你将图标放到垃圾箱区域后,就会删除该图标。这里需要区别不同的图标来源区域和不同的图标类型,分别进行删除。如果是对于文件夹,需要先将文件夹中的内容删除,然后再删除该文件夹。

[java]

public void onDrop(DragSource source, int x, int y, int xOffset, int yOffset,

DragView dragView, Object dragInfo) {

final ItemInfo item = (ItemInfo) dragInfo;

if (item.container == -1) return;

if (item.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {

if (item instanceof LauncherAppWidgetInfo) {

mLauncher.removeAppWidget((LauncherAppWidgetInfo) item);

}

} else {

if (source instanceof UserFolder) {

final UserFolder userFolder = (UserFolder) source;

final UserFolderInfo userFolderInfo = (UserFolderInfo) userFolder.getInfo();

// Item must be a ShortcutInfo otherwise it couldn't have been in the folder

// in the first place.

userFolderInfo.remove((ShortcutInfo)item);

}

}

if (item instanceof UserFolderInfo) {

final UserFolderInfo userFolderInfo = (UserFolderInfo)item;

LauncherModel.deleteUserFolderContentsFromDatabase(mLauncher, userFolderInfo);

mLauncher.removeFolder(userFolderInfo);

} else if (item instanceof LauncherAppWidgetInfo) {

final LauncherAppWidgetInfo launcherAppWidgetInfo = (LauncherAppWidgetInfo) item;

final LauncherAppWidgetHost appWidgetHost = mLauncher.getAppWidgetHost();

if (appWidgetHost != null) {

final int appWidgetId = launcherAppWidgetInfo.appWidgetId;

// Deleting an app widget ID is a void call but writes to disk before returning

// to the caller...

new Thread("deleteAppWidgetId") {

public void run() {

appWidgetHost.deleteAppWidgetId(launcherAppWidgetInfo.appWidgetId);

}

}.start();

}

}

LauncherModel.deleteItemFromDatabase(mLauncher, item);

}

public void onDrop(DragSource source, int x, int y, int xOffset, int yOffset,

DragView dragView, Object dragInfo) {

final ItemInfo item = (ItemInfo) dragInfo;

if (item.container == -1) return;

if (item.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {

if (item instanceof LauncherAppWidgetInfo) {

mLauncher.removeAppWidget((LauncherAppWidgetInfo) item);

}

} else {

if (source instanceof UserFolder) {

final UserFolder userFolder = (UserFolder) source;

final UserFolderInfo userFolderInfo = (UserFolderInfo) userFolder.getInfo();

// Item must be a ShortcutInfo otherwise it couldn't have been in the folder

// in the first place.

userFolderInfo.remove((ShortcutInfo)item);

}

}

if (item instanceof UserFolderInfo) {

final UserFolderInfo userFolderInfo = (UserFolderInfo)item;

LauncherModel.deleteUserFolderContentsFromDatabase(mLauncher, userFolderInfo);

mLauncher.removeFolder(userFolderInfo);

} else if (item instanceof LauncherAppWidgetInfo) {

final LauncherAppWidgetInfo launcherAppWidgetInfo = (LauncherAppWidgetInfo) item;

final LauncherAppWidgetHost appWidgetHost = mLauncher.getAppWidgetHost();

if (appWidgetHost != null) {

final int appWidgetId = launcherAppWidgetInfo.appWidgetId;

// Deleting an app widget ID is a void call but writes to disk before returning

// to the caller...

new Thread("deleteAppWidgetId") {

public void run() {

appWidgetHost.deleteAppWidgetId(launcherAppWidgetInfo.appWidgetId);

}

}.start();

}

}

LauncherModel.deleteItemFromDatabase(mLauncher, item);

}之前在测试公司产品时,发现直接将图标从文件夹中直接拖动到垃圾箱删除后,会发现文件夹内显示出现问题,究其原因就是未考虑到直接从文件夹中删除中的问题。

3)长按图标开始拖动及结束拖动

[java]

public void onDragStart(DragSource source, Object info, int dragAction) {

final ItemInfo item = (ItemInfo) info;

if (item != null) {

mTrashMode = true;

createAnimations();

final int[] location = mLocation;

getLocationOnScreen(location);

/**

* mRight\mLeft\mBottom\mTop属保护域,

* 需通过getRight()\getLeft()\getBottom()\getTop()来访问

* modify by author

*/

mRegion.set(location[0], location[1], location[0] + getRight() - getLeft(),

location[1] + getBottom() - getTop());

mDragController.setDeleteRegion(mRegion);

mTransition.resetTransition();

startAnimation(mInAnimation);

mHandle.startAnimation(mHandleOutAnimation);

setVisibility(VISIBLE);

}

}

public void onDragStart(DragSource source, Object info, int dragAction) {

final ItemInfo item = (ItemInfo) info;

if (item != null) {

mTrashMode = true;

createAnimations();

final int[] location = mLocation;

getLocationOnScreen(location);

/**

* mRight\mLeft\mBottom\mTop属保护域,

* 需通过getRight()\getLeft()\getBottom()\getTop()来访问

* modify by author

*/

mRegion.set(location[0], location[1], location[0] + getRight() - getLeft(),

location[1] + getBottom() - getTop());

mDragController.setDeleteRegion(mRegion);

mTransition.resetTransition();

startAnimation(mInAnimation);

mHandle.startAnimation(mHandleOutAnimation);

setVisibility(VISIBLE);

}

}之类首先获得垃圾箱图标的区域大小,据此设置DeleteZone位置的区域,同时初始化动画对象createAnimations()。

[java]

public void onDragEnd() {

if (mTrashMode) {

mTrashMode = false;

mDragController.setDeleteRegion(null);

startAnimation(mOutAnimation);

mHandle.startAnimation(mHandleInAnimation);

setVisibility(GONE);

}

}

public void onDragEnd() {

if (mTrashMode) {

mTrashMode = false;

mDragController.setDeleteRegion(null);

startAnimation(mOutAnimation);

mHandle.startAnimation(mHandleInAnimation);

setVisibility(GONE);

}

}取消拖动区域效果,并且将dock栏回复,隐藏垃圾箱;

4)初始化动画

[java]

private void createAnimations() {

if (mInAnimation == null) {

mInAnimation = new FastAnimationSet();

final AnimationSet animationSet = mInAnimation;

animationSet.setInterpolator(new AccelerateInterpolator());

animationSet.addAnimation(new AlphaAnimation(0.0f, 1.0f));

if (mOrientation == ORIENTATION_HORIZONTAL) {

animationSet.addAnimation(new TranslateAnimation(Animation.ABSOLUTE, 0.0f,

Animation.ABSOLUTE, 0.0f, Animation.RELATIVE_TO_SELF, 1.0f,

Animation.RELATIVE_TO_SELF, 0.0f));

} else {

animationSet.addAnimation(new TranslateAnimation(Animation.RELATIVE_TO_SELF,

1.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.ABSOLUTE, 0.0f,

Animation.ABSOLUTE, 0.0f));

}

animationSet.setDuration(ANIMATION_DURATION);

}

if (mHandleInAnimation == null) {

mHandleInAnimation = new AlphaAnimation(0.0f, 1.0f);

mHandleInAnimation.setDuration(ANIMATION_DURATION);

}

if (mOutAnimation == null) {

mOutAnimation = new FastAnimationSet();

final AnimationSet animationSet = mOutAnimation;

animationSet.setInterpolator(new AccelerateInterpolator());

animationSet.addAnimation(new AlphaAnimation(1.0f, 0.0f));

if (mOrientation == ORIENTATION_HORIZONTAL) {

animationSet.addAnimation(new FastTranslateAnimation(Animation.ABSOLUTE, 0.0f,

Animation.ABSOLUTE, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f,

Animation.RELATIVE_TO_SELF, 1.0f));

} else {

animationSet.addAnimation(new FastTranslateAnimation(Animation.RELATIVE_TO_SELF,

0.0f, Animation.RELATIVE_TO_SELF, 1.0f, Animation.ABSOLUTE, 0.0f,

Animation.ABSOLUTE, 0.0f));

}

animationSet.setDuration(ANIMATION_DURATION);

}

if (mHandleOutAnimation == null) {

mHandleOutAnimation = new AlphaAnimation(1.0f, 0.0f);

mHandleOutAnimation.setFillAfter(true);

mHandleOutAnimation.setDuration(ANIMATION_DURATION);

}

}

private void createAnimations() {

if (mInAnimation == null) {

mInAnimation = new FastAnimationSet();

final AnimationSet animationSet = mInAnimation;

animationSet.setInterpolator(new AccelerateInterpolator());

animationSet.addAnimation(new AlphaAnimation(0.0f, 1.0f));

if (mOrientation == ORIENTATION_HORIZONTAL) {

animationSet.addAnimation(new TranslateAnimation(Animation.ABSOLUTE, 0.0f,

Animation.ABSOLUTE, 0.0f, Animation.RELATIVE_TO_SELF, 1.0f,

Animation.RELATIVE_TO_SELF, 0.0f));

} else {

animationSet.addAnimation(new TranslateAnimation(Animation.RELATIVE_TO_SELF,

1.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.ABSOLUTE, 0.0f,

Animation.ABSOLUTE, 0.0f));

}

animationSet.setDuration(ANIMATION_DURATION);

}

if (mHandleInAnimation == null) {

mHandleInAnimation = new AlphaAnimation(0.0f, 1.0f);

mHandleInAnimation.setDuration(ANIMATION_DURATION);

}

if (mOutAnimation == null) {

mOutAnimation = new FastAnimationSet();

final AnimationSet animationSet = mOutAnimation;

animationSet.setInterpolator(new AccelerateInterpolator());

animationSet.addAnimation(new AlphaAnimation(1.0f, 0.0f));

if (mOrientation == ORIENTATION_HORIZONTAL) {

animationSet.addAnimation(new FastTranslateAnimation(Animation.ABSOLUTE, 0.0f,

Animation.ABSOLUTE, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f,

Animation.RELATIVE_TO_SELF, 1.0f));

} else {

animationSet.addAnimation(new FastTranslateAnimation(Animation.RELATIVE_TO_SELF,

0.0f, Animation.RELATIVE_TO_SELF, 1.0f, Animation.ABSOLUTE, 0.0f,

Animation.ABSOLUTE, 0.0f));

}

animationSet.setDuration(ANIMATION_DURATION);

}

if (mHandleOutAnimation == null) {

mHandleOutAnimation = new AlphaAnimation(1.0f, 0.0f);

mHandleOutAnimation.setFillAfter(true);

mHandleOutAnimation.setDuration(ANIMATION_DURATION);

}

}

这里主要设置三个动画对象,dock隐藏动画,mHandleInAnimation和mHandleOutAnimation;垃圾箱图标动画对象mInAnimation和mOutAnimation;

5)自定义Animation

这里自定义了两个Animation,主要是重载了两个函数,这两个被重载的函数的功能如下:

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