popupWindow 用法总结控制位置

android中的dialog，以及activiy形式的dialog均是模态对话框，对话框不消失时，不能对其他页面进行操作，也就是其他页面不能获得焦点。而PopupWindow是非模态对话框，对话框显示的时候，其他界面仍然可以获得焦点，仍然可以进行点击等操作，同时也可以对对话框进行点击等操作。

很好的例子就是输入法，通过查看源码就可以看到，其界面是几个popupwindow组成的。

三个关键设置

// 如果不设置PopupWindow的背景，有些版本就会出现一个问题：无论是点击外部区域还是Back键都无法dismiss弹框

popupWindow.setBackgroundDrawable(new ColorDrawable());

// setOutsideTouchable设置生效的前提是setTouchable(true)和setFocusable(false)

popupWindow.setOutsideTouchable(true);

// 设置为true之后，PopupWindow内容区域才可以响应点击事件

popupWindow.setTouchable(true);

Activity

public class MainActivity extends ListActivity {

private PopupWindow pop;

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

String[] array = { "在指定view的正左下方，无偏移", //

"相对指定view正左下方，有偏移",//

"Gravity.NO_GRAVITY：相对屏幕左上角，注意包含状态栏区域",//

"Gravity.TOP：相对屏幕正上方居中",//

"pop不会偏移出屏幕，偏移值过大时取临界值",//

"Gravity.BOTTOM：相对屏幕正下方居中，注意包含虚拟按键区域",//

"Gravity.BOTTOM：此时yoff为正时表示向上偏移（而非向下偏移）",//

"出现在View的任意位置", };

setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, new ArrayList<String>(Arrays.asList(array))));

pop = new PopupWindow(this);

pop.setFocusable(true);//必备设置1

pop.setBackgroundDrawable(new ColorDrawable(0x00ff0000));//必备设置2

pop.setOutsideTouchable(true);//setFocusable(true)后这个设置就没用了

pop.setAnimationStyle(R.style.popAniStyle);//设置动画所对应的style

}

private boolean b;

@Override

protected void onListItemClick(ListView l, View v, int position, long id) {

b = !b;

if (b) pop.setContentView(LayoutInflater.from(this).inflate(R.layout.view1, null));

else pop.setContentView(LayoutInflater.from(this).inflate(R.layout.view2, null));

switch (position) {

case 0://在指定view的正左下方，无偏移

pop.setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);//必须设置宽和高

pop.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);

pop.showAsDropDown(v);

break;

case 1://相对指定view正左下方的位置，有偏移

pop.setWidth(DensityUtils.getScreenWidth(this) - 20);

pop.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);

pop.showAsDropDown(v, 20, 10);

break;

case 2://相对于父控件的某个相对位置的偏移，默认的Gravity.NO_GRAVITY的参照物为【屏幕左上角】，注意包含状态栏区域

case 3://若偏移值大于pop偏出屏幕的临界值，将取临界值。也即pop不可能会偏移出屏幕

case 4://不管view设置的是哪一个，参照物都是整个屏幕的根布局

pop.setWidth(DensityUtils.getScreenWidth(this) - 20);

pop.setHeight(20);

if (position == 2) pop.showAtLocation(v, Gravity.NO_GRAVITY, 20, DensityUtils.getStatusBarHeight(this) + 10);//Gravity.NO_GRAVITY：相对屏幕左上角

else if (position == 3) pop.showAtLocation(v, Gravity.TOP, 10, DensityUtils.getStatusBarHeight(this) + 10);//Gravity.TOP：相对屏幕正上方居中

else pop.showAtLocation(v, Gravity.TOP, 100, DensityUtils.getStatusBarHeight(this));//临界值为 20/2=10，偏移值大于10时仅偏移10

break;

case 5://Gravity.BOTTOM：相对屏幕正下方居中，注意包含虚拟按键区域，并且此时yoff为正时表示向上偏移（而非向下偏移）

case 6://

pop.setWidth(DensityUtils.getScreenWidth(this) - 20);

pop.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);

if (position == 5) pop.showAtLocation(v, Gravity.BOTTOM, 0, DensityUtils.getBottomBarHeight(this));//Gravity.BOTTOM：相对屏幕正下方居中

else if (position == 6) pop.showAtLocation(v, Gravity.BOTTOM, -10, DensityUtils.getBottomBarHeight(this) + 10);//此时yoff为正时表示向上偏移

break;

case 7://

startActivity(new Intent(this, SecondActivity.class));

break;

}

Activity2

public class SecondActivity extends Activity {

private int num = 0;

private PopupWindow pop;

private int[] location = new int[2];;

private View contentView;

@SuppressLint("InflateParams")

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.layout);

contentView = LayoutInflater.from(this).inflate(R.layout.view2, null);

pop = new PopupWindow(contentView, LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

pop.setFocusable(true);//必备设置1

pop.setBackgroundDrawable(new ColorDrawable(0x00ff0000));//必备设置2

pop.setOutsideTouchable(true);//setFocusable(true)后这个设置就没用了

pop.setAnimationStyle(R.style.popAniStyle);//设置动画所对应的style

}

public void onClick(View v) {

v.getLocationOnScreen(location);// 获取锚点View在屏幕上的左上角坐标位置

switch (num % 4) {

case 0://右下

pop.showAtLocation(v, Gravity.NO_GRAVITY, location[0] + v.getWidth(), location[1] + v.getHeight());

break;

case 1://右上

pop.showAtLocation(v, Gravity.NO_GRAVITY, location[0] + v.getWidth(), location[1] - contentView.getHeight());

break;

case 2://左上

pop.showAtLocation(v, Gravity.NO_GRAVITY, location[0] - contentView.getWidth(), location[1] - contentView.getHeight());

break;

default://左下

pop.showAtLocation(v, Gravity.NO_GRAVITY, location[0] - contentView.getWidth(), location[1] + v.getHeight());

break;

}

Toast.makeText(this, num % 4 + "", Toast.LENGTH_SHORT).show();

num++;

}

工具类

public class DensityUtils {

//******************************************************************************************

// 单位转换

//******************************************************************************************

/**像素密度*/

public static float getDisplayMetrics(Context context) {

return context.getResources().getDisplayMetrics().density;

}

/** dp 转成为 px */

public static int dp2px(Context context, float dpValue) {

return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpValue, context.getResources().getDisplayMetrics());

}

/** px 转成为 dp */

public static int px2dp(Context context, float pxValue) {

return (int) (pxValue / getDisplayMetrics(context) + 0.5f);

}

/** sp转px */

public static int sp2px(Context context, float spVal) {

return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal, context.getResources().getDisplayMetrics());

}

/** px转sp */

public static float px2sp(Context context, float pxVal) {

return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);

}

//******************************************************************************************

// 屏幕宽高

//******************************************************************************************

/** 获取屏幕宽 */

public static int getScreenWidth(Context context) {

DisplayMetrics metric = new DisplayMetrics();

((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(metric);

return metric.widthPixels;

}

/** 获取屏幕高，包含状态栏，但不包含虚拟按键，如1920屏幕只有1794 */

public static int getScreenHeight(Context context) {

DisplayMetrics metric = new DisplayMetrics();

((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(metric);

return metric.heightPixels;

}

/** 获取屏幕宽 */

public static int getScreenWidth2(Context context) {

Point point = new Point();

((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getSize(point);

return point.x;

}

/** 获取屏幕高，包含状态栏，但不包含某些手机最下面的【HOME键那一栏】，如1920屏幕只有1794 */

public static int getScreenHeight2(Context context) {

Point point = new Point();

((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getSize(point);

return point.y;

}

/** 获取屏幕原始尺寸高度，包括状态栏以及虚拟功能键高度 */

public static int getAllScreenHeight(Context context) {

Display display = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();

try {

DisplayMetrics displayMetrics = new DisplayMetrics();

Method method = Class.forName("android.view.Display").getMethod("getRealMetrics", DisplayMetrics.class);

method.invoke(display, displayMetrics);

return displayMetrics.heightPixels;

} catch (Exception e) {

e.printStackTrace();

}

return 0;

}

//******************************************************************************************

// 状态栏、标题栏、虚拟按键

//******************************************************************************************

/** 状态栏高度，单位px，一般为25dp */

public static int getStatusBarHeight(Context context) {

int height = 0;

int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");

if (resourceId > 0) {

height = context.getResources().getDimensionPixelSize(resourceId);

}

return height;

}

/** 状态栏高度，单位px，【注意】要在onWindowFocusChanged中获取才可以 */

public static int getStatusBarHeight2(Activity activity) {

Rect rect = new Rect();

//DecorView是Window中的最顶层view，可以从DecorView获取到程序显示的区域，包括标题栏，但不包括状态栏。所以状态栏的高度即为显示区域的top坐标值

activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);

return rect.top;

}

/**标题栏的高度，【注意】要在onWindowFocusChanged中获取才可以*/

public static int getTitleBarHeight(Activity activity) {

int contentTop = activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();

return contentTop - getStatusBarHeight(activity);

}

/**获取虚拟按键的高度 */

public static int getBottomBarHeight(Context context) {

return getAllScreenHeight(context) - getScreenHeight(context);

}

常用API

构造方法

public PopupWindow(View contentView)
public PopupWindow(Context context)
public PopupWindow(View contentView, int width, int height)
public PopupWindow(View contentView, int width, int height, boolean focusable)

参数说明

contentView为要显示的view；PopupWindow没有默认布局，它不会像AlertDialog那样只setTitle就能弹出来一个框，所以contentView必须设置。
width和height为要显示的view的宽和高，值为像素值或MATCHT_PARENT、WRAP_CONTENT；如果View是从xml得到的，那么xml的第一层view的大小属性将被忽略；必须设置宽和高，否则显示不出来。
focusable为是否能获得焦点

举例

View contentView = LayoutInflater.from(this).inflate(R.layout.popuplayout, null);

方法1：PopupWindow popupWindow = new PopupWindow(contentview,LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);

方法2：PopupWindow popupWindow = new PopupWindow(contentview);

方法3：PopupWindwo popWnd = PopupWindow (context);

popWnd.setContentView(contentView);

popupWindow.setWidth(LayoutParams.MATCHT_PARENT);

popupWindow.setHeight(LayoutParams.WRAP_CONTENT);

show方法

showAsDropDown(View anchor) 相对某个控件的位置(正左下方)，无偏移。最终调用的是下面的方法
showAsDropDown(View anchor, int xoff, int yoff) 相对某个控件的位置，有偏移，xoff表示x轴的偏移，正值表示向左，负值表示向右；yoff表示相对y轴的偏移，正值是向下，负值是向上；最终调用的是下面的方法
showAsDropDown(View anchor, int xoff, int yoff, int gravity) 【注：这个方法貌似不起作用】相对某个控件的某个位置，有偏移。gravity的默认值为DEFAULT_ANCHORED_GRAVITY= Gravity.TOP | Gravity.START
showAtLocation(View parent, int gravity, int x, int y) 相对于父控件(不管view设置的是哪一个，参照物都是整个屏幕的根布局)的某个位置(例如正中央Gravity.CENTER，下方Gravity.BOTTOM等)，可以设置偏移或无偏移。

/**
 * Displays the content view in a popup window anchored to the corner of
 * another view. The window is positioned according to the specified
 * gravity and offset by the specified x and y coordinates.
 * <p>
 * If there is not enough room on screen to show the popup in its entirety,
 * this method tries to find a parent scroll view to scroll. If no parent
 * view can be scrolled, the specified vertical gravity will be ignored and
 * the popup will anchor itself such that it is visible.
 * <p>
 * If the view later scrolls to move <code>anchor</code> to a different
 * location, the popup will be moved correspondingly.
 *
 * @param anchor the view on which to pin the popup window
 * @param xoff A horizontal offset from the anchor in pixels
 * @param yoff A vertical offset from the anchor in pixels
 * @param gravity Alignment of the popup relative to the anchor
 *
 * @see #dismiss()
 */
public void showAsDropDown(View anchor, int xoff, int yoff, int gravity)



/**
 * <p>
 * Display the content view in a popup window at the specified location. If the popup window
 * cannot fit on screen, it will be clipped. See {@link android.view.WindowManager.LayoutParams}
 * for more information on how gravity and the x and y parameters are related. Specifying
 * a gravity of {@link android.view.Gravity#NO_GRAVITY} is similar to specifying
 * <code>Gravity.LEFT | Gravity.TOP</code>.
 * </p>
 *
 * @param parent a parent view to get the {@link android.view.View#getWindowToken()} token from
 * @param gravity the gravity which controls the placement of the popup window
 * @param x the popup's x location offset
 * @param y the popup's y location offset
 */
public void showAtLocation(View parent, int gravity, int x, int y)

showAtLocation的parent参数可以很随意，只要是activity中的view都可以。

setFocusable

setFocusable(boolean focusable) 设置PopupWindow是否获取焦点

/**
 * <p>Changes the focusability of the popup window. When focusable, the
 * window will grab the focus from the current focused widget if the popup
 * contains a focusable {@link android.view.View}.  By default a popup
 * window is not focusable.</p>
 *
 * <p>If the popup is showing, calling this method will take effect only
 * the next time the popup is shown or through a manual call to one of
 * the {@link #update()} methods.</p>
 *
 * @param focusable true if the popup should grab focus, false otherwise.
 *
 * @see #isFocusable()
 * @see #isShowing()
 * @see #update()
 */
public void setFocusable(boolean focusable) {
	mFocusable = focusable;
}

setOutsideTouchable

/**
 * <p>Controls whether the pop-up will be informed of touch events outside
 * of its window.  This only makes sense for pop-ups that are touchable
 * but not focusable, which means touches outside of the window will
 * be delivered to the window behind.  The default is false.</p>
 *
 * <p>If the popup is showing, calling this method will take effect only
 * the next time the popup is shown or through a manual call to one of
 * the {@link #update()} methods.</p>
 *
 * @param touchable true if the popup should receive outside
 * touch events, false otherwise
 *
 * @see #isOutsideTouchable()
 * @see #isShowing()
 * @see #update()
 */
public void setOutsideTouchable(boolean touchable) {
	mOutsideTouchable = touchable;
}

2017-2-20

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