AlertDialog在位置中心的模糊背景
问题
试图模糊（而非DIM）Dialog的背景。
且FLAG_BLUR_BEHIND 已弃用。
方法是，从醋栗视图中截取屏幕截图并将其模糊。然后附加到背景，当AlertDialog出现时，它会起作用。
但AlertDialog始终位于中心的顶部而非。（查看图片）
WindowManager.LayoutParams在附加后没有效果。（在将其附加到背景之前，警告可以位置居中，但在将模糊视图附加到后台AlertDialog总是排在最前面）
如何在屏幕上设置警报中心？
下面是我试过的代码，任何指南都将不胜感激，
按下时显示警告。
@Override
public void onBackPressed() {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AlertDialogCustom);
builder.setTitle("Lets Blur");
builder.setMessage("This is Blur Demo");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
dialog = builder.create();
// this position alert in the CENTER
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
WindowManager.LayoutParams wmlp = dialog.getWindow().getAttributes();
wmlp.gravity = Gravity.CENTER;
dialog.show();
new BlurAsyncTask().execute();
}
class BlurAsyncTask extends AsyncTask<Void, Integer, Bitmap> {
protected Bitmap doInBackground(Void...arg0) {
Bitmap map = AppUtils.takeScreenShot(MainActivity.this);
Bitmap fast = new BlurView().fastBlur(map, 10);
return fast;
}
protected void onPostExecute(Bitmap result) {
if (result != null){
final Drawable draw=new BitmapDrawable(getResources(),result);
Window window = dialog.getWindow();
// this position alert again in the TOP -- need to avoid that!
window.setBackgroundDrawable(draw);
window.setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT);
window.setGravity(Gravity.CENTER);
dialog.show();
}
}
其他课程
AppUtils
public class AppUtils {
public static Bitmap takeScreenShot(Activity activity) {
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap b1 = view.getDrawingCache();
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
Display display = activity.getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight);
view.destroyDrawingCache();
return b;
}
}
BlurView
public class BlurView {
public Bitmap fastBlur(Bitmap sentBitmap, int radius) {
Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
if (radius < 1) {
return (null);
}
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int[] pix = new int[w * h];
Log.e("pix", w + " " + h + " " + pix.length);
bitmap.getPixels(pix, 0, w, 0, 0, w, h);
int wm = w - 1;
int hm = h - 1;
int wh = w * h;
int div = radius + radius + 1;
int r[] = new int[wh];
int g[] = new int[wh];
int b[] = new int[wh];
int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
int vmin[] = new int[Math.max(w, h)];
int divsum = (div + 1) >> 1;
divsum *= divsum;
int dv[] = new int[256 * divsum];
for (i = 0; i < 256 * divsum; i++) {
dv[i] = (i / divsum);
}
yw = yi = 0;
int[][] stack = new int[div][3];
int stackpointer;
int stackstart;
int[] sir;
int rbs;
int r1 = radius + 1;
int routsum, goutsum, boutsum;
int rinsum, ginsum, binsum;
for (y = 0; y < h; y++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
for (i = -radius; i <= radius; i++) {
p = pix[yi + Math.min(wm, Math.max(i, 0))];
sir = stack[i + radius];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rbs = r1 - Math.abs(i);
rsum += sir[0] * rbs;
gsum += sir[1] * rbs;
bsum += sir[2] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
}
stackpointer = radius;
for (x = 0; x < w; x++) {
r[yi] = dv[rsum];
g[yi] = dv[gsum];
b[yi] = dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (y == 0) {
vmin[x] = Math.min(x + radius + 1, wm);
}
p = pix[yw + vmin[x]];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[(stackpointer) % div];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi++;
}
yw += w;
}
for (x = 0; x < w; x++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
yp = -radius * w;
for (i = -radius; i <= radius; i++) {
yi = Math.max(0, yp) + x;
sir = stack[i + radius];
sir[0] = r[yi];
sir[1] = g[yi];
sir[2] = b[yi];
rbs = r1 - Math.abs(i);
rsum += r[yi] * rbs;
gsum += g[yi] * rbs;
bsum += b[yi] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
if (i < hm) {
yp += w;
}
}
yi = x;
stackpointer = radius;
for (y = 0; y < h; y++) {
// Preserve alpha channel: ( 0xff000000 & pix[yi] )
pix[yi] = ( 0xff000000 & pix[yi] ) | ( dv[rsum] << 16 ) | ( dv[gsum] << 8 ) | dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (x == 0) {
vmin[y] = Math.min(y + r1, hm) * w;
}
p = x + vmin[y];
sir[0] = r[p];
sir[1] = g[p];
sir[2] = b[p];
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[stackpointer];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi += w;
}
}
Log.e("pix", w + " " + h + " " + pix.length);
bitmap.setPixels(pix, 0, w, 0, 0, w, h);
return (bitmap);
}
}
屏幕截图 - 这是我得到的结果 - 我想制作警报中心，但它仍然保持领先
编辑：答案的概念
- 拍摄屏幕截图
- 以编程方式设置动画/模糊/对该屏幕快照的任何影响
- 使用没有任何内容的对话框获取currant窗口
- 附加有效的屏幕截图
- 显示我想要显示的真实视图
旁注：这可用于附加任何类型的背景！ blur .. dim..bright ..只需添加接受位图的正确方法，并在BlurView类中返回您想要的更改的位图。我添加了一个模糊的。
1 个答案:
答案 0 :(得分：1)
注意：此屏幕背景可以是您拥有的任何内容，其功能是截取屏幕截图并模糊最终将其设置为alertDialog的背景模糊效果
问题是alertDialog附加了模糊背景总是在顶部，我无法改变它。
我提出了这个解决方案。
我不得不使用两个alertDialogs
一个用于模糊效果（使用getWindow()）并且现在无法显示（我删除了setContentView /可以使用透明背景）
另一个是模糊效果后显示的真实警报对话框。
<强> MainActivity
public class MainActivity extends AppCompatActivity {
private AlertDialog dialogWhichDisplayAlert;
private Dialog fakeDialogUseToGetWindowForBlurEffect;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public void onBackPressed() {
fakeDialogUseToGetWindowForBlurEffect = new Dialog(MainActivity.this);
// fakeDialogUseToGetWindowForBlurEffect.setContentView(R.layout.fakealert); // removed the content so not visible
new BlurAsyncTask().execute();
}
class BlurAsyncTask extends AsyncTask<Void, Integer, Bitmap> {
protected Bitmap doInBackground(Void...arg0) {
Bitmap map = AppUtils.takeScreenShot(MainActivity.this);
Bitmap fast = new BlurView().fastBlur(map, 10);
return fast;
}
protected void onPostExecute(Bitmap result) {
if (result != null){
final Drawable draw=new BitmapDrawable(getResources(),result);
Window window = fakeDialogUseToGetWindowForBlurEffect.getWindow();
window.setBackgroundDrawable(draw);
window.setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT);
window.setGravity(Gravity.CENTER);
fakeDialogUseToGetWindowForBlurEffect.show();
// real one
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AlertDialogCustom);
builder.setTitle("Lets Blur");
builder.setMessage("This is Blur Demo");
builder.setCancelable(false);
builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
fakeDialogUseToGetWindowForBlurEffect.dismiss();
dialog.cancel();
}
});
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
fakeDialogUseToGetWindowForBlurEffect.dismiss();
dialog.cancel();
}
});
dialogWhichDisplayAlert = builder.create();
// position real dialogWhichDisplayAlert using Gravity.CENTER;
dialogWhichDisplayAlert.requestWindowFeature(Window.FEATURE_NO_TITLE);
WindowManager.LayoutParams wmlp = dialogWhichDisplayAlert.getWindow().getAttributes();
wmlp.gravity = Gravity.CENTER;
dialogWhichDisplayAlert.show();
}
}
}
}
[使用的其他类与问题相同]
<强>式
<style name="AlertDialogCustom" parent="@android:style/Theme.Dialog">
<item name="android:textColor">#00FF00</item>
<item name="android:typeface">monospace</item>
<item name="android:textSize">10sp</item>
</style>
输出
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