UninstallDropTarget.java revision 734dfbe2726c748b70eca6a2e3742a7443757bbe 
1package com.android.launcher3;
2
3import android.annotation.TargetApi;
4import android.content.ComponentName;
5import android.content.Context;
6import android.os.Build;
7import android.os.Bundle;
8import android.os.UserManager;
9import android.util.AttributeSet;
10import android.util.Pair;
11
12import com.android.launcher3.compat.UserHandleCompat;
13import com.android.launcher3.util.Thunk;
14
15public class UninstallDropTarget extends ButtonDropTarget {
16
17    public UninstallDropTarget(Context context, AttributeSet attrs) {
18        this(context, attrs, 0);
19    }
20
21    public UninstallDropTarget(Context context, AttributeSet attrs, int defStyle) {
22        super(context, attrs, defStyle);
23    }
24
25    @Override
26    protected void onFinishInflate() {
27        super.onFinishInflate();
28        // Get the hover color
29        mHoverColor = getResources().getColor(R.color.uninstall_target_hover_tint);
30
31        setDrawable(R.drawable.ic_uninstall_launcher);
32    }
33
34    @Override
35    protected boolean supportsDrop(DragSource source, ItemInfo info) {
36        return supportsDrop(getContext(), info);
37    }
38
39    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
40    public static boolean supportsDrop(Context context, Object info) {
41        if (Utilities.ATLEAST_JB_MR2) {
42            UserManager userManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
43            Bundle restrictions = userManager.getUserRestrictions();
44            if (restrictions.getBoolean(UserManager.DISALLOW_APPS_CONTROL, false)
45                    || restrictions.getBoolean(UserManager.DISALLOW_UNINSTALL_APPS, false)) {
46                return false;
47            }
48        }
49
50        Pair<ComponentName, Integer> componentInfo = getAppInfoFlags(info);
51        return componentInfo != null && (componentInfo.second & AppInfo.DOWNLOADED_FLAG) != 0;
52    }
53
54    /**
55     * @return the component name and flags if {@param info} is an AppInfo or an app shortcut.
56     */
57    private static Pair<ComponentName, Integer> getAppInfoFlags(Object item) {
58        if (item instanceof AppInfo) {
59            AppInfo info = (AppInfo) item;
60            return Pair.create(info.componentName, info.flags);
61        } else if (item instanceof ShortcutInfo) {
62            ShortcutInfo info = (ShortcutInfo) item;
63            ComponentName component = info.getTargetComponent();
64            if (info.itemType == LauncherSettings.BaseLauncherColumns.ITEM_TYPE_APPLICATION
65                    && component != null) {
66                return Pair.create(component, info.flags);
67            }
68        }
69        return null;
70    }
71
72    @Override
73    public void onDrop(DragObject d) {
74        // Differ item deletion
75        if (d.dragSource instanceof UninstallSource) {
76            ((UninstallSource) d.dragSource).deferCompleteDropAfterUninstallActivity();
77        }
78        super.onDrop(d);
79    }
80
81    @Override
82    void completeDrop(final DragObject d) {
83        final Pair<ComponentName, Integer> componentInfo = getAppInfoFlags(d.dragInfo);
84        final UserHandleCompat user = d.dragInfo.user;
85        if (startActivityWithUninstallAffordance(d)) {
86
87            final Runnable checkIfUninstallWasSuccess = new Runnable() {
88                @Override
89                public void run() {
90                    String packageName = componentInfo.first.getPackageName();
91                    boolean uninstallSuccessful = !AllAppsList.packageHasActivities(
92                            getContext(), packageName, user);
93                    sendUninstallResult(d.dragSource, uninstallSuccessful);
94                }
95            };
96            mLauncher.addOnResumeCallback(checkIfUninstallWasSuccess);
97        } else {
98            sendUninstallResult(d.dragSource, false);
99        }
100    }
101
102    protected boolean startActivityWithUninstallAffordance(DragObject d) {
103        return startUninstallActivity(mLauncher, d.dragInfo);
104    }
105
106    public static boolean startUninstallActivity(Launcher launcher, ItemInfo info) {
107        final Pair<ComponentName, Integer> componentInfo = getAppInfoFlags(info);
108        final UserHandleCompat user = info.user;
109        return launcher.startApplicationUninstallActivity(
110                componentInfo.first, componentInfo.second, user);
111    }
112
113    @Thunk void sendUninstallResult(DragSource target, boolean result) {
114        if (target instanceof UninstallSource) {
115            ((UninstallSource) target).onUninstallActivityReturned(result);
116        }
117    }
118
119    /**
120     * Interface defining an object that can provide uninstallable drag objects.
121     */
122    public interface UninstallSource {
123
124        /**
125         * A pending uninstall operation was complete.
126         * @param result true if uninstall was successful, false otherwise.
127         */
128        void onUninstallActivityReturned(boolean result);
129
130        /**
131         * Indicates that an uninstall request are made and the actual result may come
132         * after some time.
133         */
134        void deferCompleteDropAfterUninstallActivity();
135    }
136}
137