CreatePlaylist.java revision 538837ba749c5a8dafd157b17e66ad2584a5a856 
1/*
2 * Copyright (C) 2007 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.music;
18
19import android.app.Activity;
20import android.content.ContentResolver;
21import android.content.ContentUris;
22import android.content.ContentValues;
23import android.content.Intent;
24import android.database.Cursor;
25import android.media.AudioManager;
26import android.net.Uri;
27import android.os.Bundle;
28import android.provider.MediaStore;
29import android.text.Editable;
30import android.text.TextWatcher;
31import android.view.View;
32import android.view.Window;
33import android.view.WindowManager;
34import android.widget.Button;
35import android.widget.EditText;
36import android.widget.TextView;
37
38public class CreatePlaylist extends Activity
39{
40    private EditText mPlaylist;
41    private TextView mPrompt;
42    private Button mSaveButton;
43
44    @Override
45    public void onCreate(Bundle icicle) {
46        super.onCreate(icicle);
47        setVolumeControlStream(AudioManager.STREAM_MUSIC);
48
49        requestWindowFeature(Window.FEATURE_NO_TITLE);
50        setContentView(R.layout.create_playlist);
51        getWindow().setLayout(WindowManager.LayoutParams.MATCH_PARENT,
52                                    WindowManager.LayoutParams.WRAP_CONTENT);
53
54        mPrompt = (TextView)findViewById(R.id.prompt);
55        mPlaylist = (EditText)findViewById(R.id.playlist);
56        mSaveButton = (Button) findViewById(R.id.create);
57        mSaveButton.setOnClickListener(mOpenClicked);
58
59        ((Button)findViewById(R.id.cancel)).setOnClickListener(new View.OnClickListener() {
60            public void onClick(View v) {
61                finish();
62            }
63        });
64
65        String defaultname = icicle != null ? icicle.getString("defaultname") : makePlaylistName();
66        if (defaultname == null) {
67            finish();
68            return;
69        }
70        String promptformat = getString(R.string.create_playlist_create_text_prompt);
71        String prompt = String.format(promptformat, defaultname);
72        mPrompt.setText(prompt);
73        mPlaylist.setText(defaultname);
74        mPlaylist.setSelection(defaultname.length());
75        mPlaylist.addTextChangedListener(mTextWatcher);
76    }
77
78    TextWatcher mTextWatcher = new TextWatcher() {
79        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
80            // don't care about this one
81        }
82        public void onTextChanged(CharSequence s, int start, int before, int count) {
83            String newText = mPlaylist.getText().toString();
84            if (newText.trim().length() == 0) {
85                mSaveButton.setEnabled(false);
86            } else {
87                mSaveButton.setEnabled(true);
88                // check if playlist with current name exists already, and warn the user if so.
89                if (idForplaylist(newText) >= 0) {
90                    mSaveButton.setText(R.string.create_playlist_overwrite_text);
91                } else {
92                    mSaveButton.setText(R.string.create_playlist_create_text);
93                }
94            }
95        };
96        public void afterTextChanged(Editable s) {
97            // don't care about this one
98        }
99    };
100
101    private int idForplaylist(String name) {
102        Cursor c = MusicUtils.query(this, MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
103                new String[] { MediaStore.Audio.Playlists._ID },
104                MediaStore.Audio.Playlists.NAME + "=?",
105                new String[] { name },
106                MediaStore.Audio.Playlists.NAME);
107        int id = -1;
108        if (c != null) {
109            c.moveToFirst();
110            if (!c.isAfterLast()) {
111                id = c.getInt(0);
112            }
113        }
114        c.close();
115        return id;
116    }
117
118    @Override
119    public void onSaveInstanceState(Bundle outcicle) {
120        outcicle.putString("defaultname", mPlaylist.getText().toString());
121    }
122
123    @Override
124    public void onResume() {
125        super.onResume();
126    }
127
128    private String makePlaylistName() {
129
130        String template = getString(R.string.new_playlist_name_template);
131        int num = 1;
132
133        String[] cols = new String[] {
134                MediaStore.Audio.Playlists.NAME
135        };
136        ContentResolver resolver = getContentResolver();
137        String whereclause = MediaStore.Audio.Playlists.NAME + " != ''";
138        Cursor c = resolver.query(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
139            cols, whereclause, null,
140            MediaStore.Audio.Playlists.NAME);
141
142        if (c == null) {
143            return null;
144        }
145
146        String suggestedname;
147        suggestedname = String.format(template, num++);
148
149        // Need to loop until we've made 1 full pass through without finding a match.
150        // Looping more than once shouldn't happen very often, but will happen if
151        // you have playlists named "New Playlist 1"/10/2/3/4/5/6/7/8/9, where
152        // making only one pass would result in "New Playlist 10" being erroneously
153        // picked for the new name.
154        boolean done = false;
155        while (!done) {
156            done = true;
157            c.moveToFirst();
158            while (! c.isAfterLast()) {
159                String playlistname = c.getString(0);
160                if (playlistname.compareToIgnoreCase(suggestedname) == 0) {
161                    suggestedname = String.format(template, num++);
162                    done = false;
163                }
164                c.moveToNext();
165            }
166        }
167        c.close();
168        return suggestedname;
169    }
170
171    private View.OnClickListener mOpenClicked = new View.OnClickListener() {
172        public void onClick(View v) {
173            String name = mPlaylist.getText().toString();
174            if (name != null && name.length() > 0) {
175                ContentResolver resolver = getContentResolver();
176                int id = idForplaylist(name);
177                Uri uri;
178                if (id >= 0) {
179                    uri = ContentUris.withAppendedId(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, id);
180                    MusicUtils.clearPlaylist(CreatePlaylist.this, id);
181                } else {
182                    ContentValues values = new ContentValues(1);
183                    values.put(MediaStore.Audio.Playlists.NAME, name);
184                    uri = resolver.insert(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, values);
185                }
186                setResult(RESULT_OK, (new Intent()).setData(uri));
187                finish();
188            }
189        }
190    };
191}
192