PermissionCheckActivity.java revision 461a34b466cb4b13dbbc2ec6330b31e217b2ac4e 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.messaging.ui;
18
19import android.app.Activity;
20import android.content.Intent;
21import android.net.Uri;
22import android.os.Bundle;
23import android.os.SystemClock;
24import android.provider.Settings;
25import android.view.View;
26import android.view.View.OnClickListener;
27import android.widget.TextView;
28
29import com.android.messaging.Factory;
30import com.android.messaging.R;
31import com.android.messaging.util.OsUtil;
32import com.android.messaging.util.UiUtils;
33
34/**
35 * Activity to check if the user has required permissions. If not, it will try to prompt the user
36 * to grant permissions. However, the OS may not actually prompt the user if the user had
37 * previously checked the "Never ask again" checkbox while denying the required permissions.
38 */
39public class PermissionCheckActivity extends Activity {
40    private static final int REQUIRED_PERMISSIONS_REQUEST_CODE = 1;
41    private static final long AUTOMATED_RESULT_THRESHOLD_MILLLIS = 250;
42    private static final String PACKAGE_URI_PREFIX = "package:";
43    private long mRequestTimeMillis;
44    private TextView mNextView;
45    private TextView mSettingsView;
46
47    @Override
48    protected void onCreate(final Bundle savedInstanceState) {
49        super.onCreate(savedInstanceState);
50        if (redirectIfNeeded()) {
51            return;
52        }
53
54        setContentView(R.layout.permission_check_activity);
55        UiUtils.setStatusBarColor(this, getColor(R.color.permission_check_activity_background));
56
57        findViewById(R.id.exit).setOnClickListener(new OnClickListener() {
58            @Override
59            public void onClick(final View view) {
60                finish();
61            }
62        });
63
64        mNextView = (TextView) findViewById(R.id.next);
65        mNextView.setOnClickListener(new OnClickListener() {
66            @Override
67            public void onClick(final View view) {
68                tryRequestPermission();
69            }
70        });
71
72        mSettingsView = (TextView) findViewById(R.id.settings);
73        mSettingsView.setOnClickListener(new OnClickListener() {
74            @Override
75            public void onClick(final View view) {
76                final Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
77                        Uri.parse(PACKAGE_URI_PREFIX + getPackageName()));
78                startActivity(intent);
79            }
80        });
81    }
82
83    @Override
84    public void onResume() {
85        super.onResume();
86
87        if (redirectIfNeeded()) {
88            return;
89        }
90    }
91
92    private void tryRequestPermission() {
93        final String[] missingPermissions = OsUtil.getMissingRequiredPermissions();
94        if (missingPermissions.length == 0) {
95            redirect();
96            return;
97        }
98
99        mRequestTimeMillis = SystemClock.elapsedRealtime();
100        requestPermissions(missingPermissions, REQUIRED_PERMISSIONS_REQUEST_CODE);
101    }
102
103    @Override
104    public void onRequestPermissionsResult(
105            final int requestCode, final String permissions[], final int[] grantResults) {
106        if (requestCode == REQUIRED_PERMISSIONS_REQUEST_CODE) {
107            // We do not use grantResults as some of the granted permissions might have been
108            // revoked while the permissions dialog box was being shown for the missing permissions.
109            if (OsUtil.hasRequiredPermissions()) {
110                Factory.get().onRequiredPermissionsAcquired();
111                redirect();
112            } else {
113                final long currentTimeMillis = SystemClock.elapsedRealtime();
114                // If the permission request completes very quickly, it must be because the system
115                // automatically denied. This can happen if the user had previously denied it
116                // and checked the "Never ask again" check box.
117                if ((currentTimeMillis - mRequestTimeMillis) < AUTOMATED_RESULT_THRESHOLD_MILLLIS) {
118                    mNextView.setVisibility(View.GONE);
119
120                    mSettingsView.setVisibility(View.VISIBLE);
121                    findViewById(R.id.enable_permission_procedure).setVisibility(View.VISIBLE);
122                }
123            }
124        }
125    }
126
127    /** Returns true if the redirecting was performed */
128    private boolean redirectIfNeeded() {
129        if (!OsUtil.hasRequiredPermissions()) {
130            return false;
131        }
132
133        redirect();
134        return true;
135    }
136
137    private void redirect() {
138        UIIntents.get().launchConversationListActivity(this);
139        finish();
140    }
141}
142