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Instantiating background image of preview video in

Browse Source 
Magnification Gesture screen using ImageView, also
set GlobalLayoutListener to adjust its position.
Bug: 27992162
Bug: 27901691

Change-Id: I9563eb2776bcde3d7edeb4a420a9b3c02481baf8
This commit is contained in:
Noah Wang
2016-04-08 17:47:57 -07:00
parent 40c2e7adcf
commit f3a20cc9bc
2 changed files with 55 additions and 39 deletions
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13
res/layout/video_preference.xml
View File

@@ -15,13 +15,22 @@
-->
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/video_background"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/video_background"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="@drawable/accessibility_screen_magnification_background"
android:scaleType="fitXY"
android:adjustViewBounds="true" />
<VideoView
android:id="@+id/video"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
android:layout_height="wrap_content"
android:layout_alignTop="@id/video_background"
android:layout_centerHorizontal="true" />
</RelativeLayout>

81
src/com/android/settings/accessibility/ToggleScreenMagnificationPreferenceFragment.java
View File

@@ -30,20 +30,24 @@ import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceScreen;
import android.support.v7.preference.PreferenceViewHolder;
import android.view.Display;
import android.view.Gravity;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.MediaController;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;
import android.widget.VideoView;
import com.android.internal.logging.MetricsProto.MetricsEvent;
import com.android.settings.R;
import com.android.settings.widget.ToggleSwitch;
import com.android.settings.widget.ToggleSwitch.OnBeforeCheckedChangeListener;
public class ToggleScreenMagnificationPreferenceFragment
extends ToggleFeaturePreferenceFragment {
public class ToggleScreenMagnificationPreferenceFragment extends ToggleFeaturePreferenceFragment {
protected class VideoPreference extends Preference {
private ImageView mVideoBackgroundView;
private OnGlobalLayoutListener mLayoutListener;
public VideoPreference(Context context) {
super(context);
}
@@ -51,40 +55,19 @@ public class ToggleScreenMagnificationPreferenceFragment
@Override
public void onBindViewHolder(PreferenceViewHolder view) {
super.onBindViewHolder(view);
Resources res = getPrefContext().getResources();
final int backgroundAssetWidth = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_background_width);
final int videoAssetWidth = res
.getDimensionPixelSize(R.dimen.screen_magnification_video_width);
final int videoAssetHeight = res
.getDimensionPixelSize(R.dimen.screen_magnification_video_height);
final int videoAssetMarginTop = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_margin_top);
view.setDividerAllowedAbove(false);
view.setDividerAllowedBelow(false);
final RelativeLayout background =
(RelativeLayout) view.findViewById(R.id.video_background);
VideoView videoView = (VideoView) view.findViewById(R.id.video);
// Hacky adjustment for using VideoView in recycle view and positioning
// it on the background image
Resources res = getPrefContext().getResources();
final int backgroundWidth = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_background_width);
final int backgroundHeight = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_background_height);
final int videoWidth = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_width);
final int videoHeight = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_height);
final int videoMarginTop = res.getDimensionPixelSize(
R.dimen.screen_magnification_video_margin_top);
final int screenWidth = getScreenWidth(getPrefContext());
RelativeLayout.LayoutParams videoLp = new RelativeLayout.LayoutParams(
screenWidth * videoWidth / backgroundWidth,
screenWidth * videoHeight / backgroundWidth);
videoLp.setMargins(0, screenWidth * videoMarginTop / backgroundWidth, 0, 0);
videoView.setLayoutParams(videoLp);
RelativeLayout.LayoutParams backgroundLp = new RelativeLayout.LayoutParams(
screenWidth,
screenWidth * backgroundHeight / backgroundWidth);
background.setLayoutParams(backgroundLp);
background.setBackgroundResource(
R.drawable.accessibility_screen_magnification_background);
background.setGravity(Gravity.CENTER_HORIZONTAL);
mVideoBackgroundView = (ImageView) view.findViewById(R.id.video_background);
final VideoView videoView = (VideoView) view.findViewById(R.id.video);
// Loop the video.
videoView.setOnPreparedListener(new OnPreparedListener() {
@@ -100,7 +83,31 @@ public class ToggleScreenMagnificationPreferenceFragment
R.raw.accessibility_screen_magnification)));
// Make sure video controls (e.g. for pausing) are not displayed.
videoView.setMediaController(null);
videoView.start();
// LayoutListener for adjusting the position of the VideoView on the background image.
mLayoutListener = new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
final int backgroundViewWidth = mVideoBackgroundView.getWidth();
LayoutParams videoLp = (LayoutParams) videoView.getLayoutParams();
videoLp.width = videoAssetWidth * backgroundViewWidth / backgroundAssetWidth;
videoLp.height = videoAssetHeight * backgroundViewWidth / backgroundAssetWidth;
videoLp.setMargins(0,
videoAssetMarginTop * backgroundViewWidth / backgroundAssetWidth, 0, 0);
videoView.setLayoutParams(videoLp);
videoView.invalidate();
videoView.start();
}
};
mVideoBackgroundView.getViewTreeObserver().addOnGlobalLayoutListener(mLayoutListener);
}
@Override
protected void onPrepareForRemoval() {
mVideoBackgroundView.getViewTreeObserver()
.removeOnGlobalLayoutListener(mLayoutListener);
}
}