UninstallDropTarget.java revision ce86e194c41d37b40bd4423bd1954d05bde24840 
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                    boolean uninstallSuccessful = false;
91                    if (componentInfo != null) {
92                        String packageName = componentInfo.first.getPackageName();
93                        uninstallSuccessful = !AllAppsList.packageHasActivities(
94                                getContext(), packageName, user);
95                    }
96                    sendUninstallResult(d.dragSource, uninstallSuccessful);
97                }
98            };
99            mLauncher.addOnResumeCallback(checkIfUninstallWasSuccess);
100        } else {
101            sendUninstallResult(d.dragSource, false);
102        }
103    }
104
105    protected boolean startActivityWithUninstallAffordance(DragObject d) {
106        return startUninstallActivity(mLauncher, d.dragInfo);
107    }
108
109    public static boolean startUninstallActivity(Launcher launcher, ItemInfo info) {
110        final Pair<ComponentName, Integer> componentInfo = getAppInfoFlags(info);
111        final UserHandleCompat user = info.user;
112        return launcher.startApplicationUninstallActivity(
113                componentInfo.first, componentInfo.second, user);
114    }
115
116    @Thunk void sendUninstallResult(DragSource target, boolean result) {
117        if (target instanceof UninstallSource) {
118            ((UninstallSource) target).onUninstallActivityReturned(result);
119        }
120    }
121
122    /**
123     * Interface defining an object that can provide uninstallable drag objects.
124     */
125    public interface UninstallSource {
126
127        /**
128         * A pending uninstall operation was complete.
129         * @param result true if uninstall was successful, false otherwise.
130         */
131        void onUninstallActivityReturned(boolean result);
132
133        /**
134         * Indicates that an uninstall request are made and the actual result may come
135         * after some time.
136         */
137        void deferCompleteDropAfterUninstallActivity();
138    }
139}
140