我制作了一个艺术家列表,点击后会显示专辑列表。这个想法是,一旦单击专辑,就会出现歌曲列表。
不幸的是,因为在这个活动中生成了两个列表视图,第二个“onItemClick”方法在 Eclipse 中被标记为“重复”。有谁知道如何解决这个问题?
这是主要的活动代码:
package music.library;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class MusicLibrary extends Activity implements OnItemClickListener {
Cursor cursor;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String[] columns = {
MediaStore.Audio.Artists._ID,
MediaStore.Audio.Artists.ARTIST };
cursor = managedQuery(MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI,
columns, null, null, null);
ListView listView = (ListView) findViewById(R.id.listView);
listView.setOnItemClickListener(this);
String[] displayFields = new String[] { MediaStore.Audio.Artists.ARTIST };
int[] displayViews = new int[] { R.id.artistItem };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.artist_item, cursor, displayFields, displayViews);
listView.setAdapter(adapter);
}
@SuppressWarnings("deprecation")
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
if (cursor.moveToPosition(position)) {
String[] columns = {
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.ALBUM,
};
String where = android.provider.MediaStore.Audio.Media.ARTIST
+ "=?";
String whereVal[] = { cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Albums.ARTIST)) };
String orderBy = android.provider.MediaStore.Audio.Media._ID;
cursor = managedQuery(
MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, columns,
where, whereVal, orderBy);
ListView listView = (ListView) findViewById(R.id.listView);
String[] displayFields = new String[] { MediaStore.Audio.Media.ALBUM };
int[] displayViews = new int[] { R.id.albumItem };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.album_item, cursor, displayFields, displayViews);
listView.setAdapter(adapter);
}
}
@SuppressWarnings("deprecation")
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
if (cursor.moveToPosition(position)) {
String[] columns = {
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.DISPLAY_NAME,
};
String where = MediaStore.Audio.Media.ALBUM
+ "=?";
String whereVal[] = { cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Albums.ALBUM)) };
String orderBy = MediaStore.Audio.Media._ID;
cursor = managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, columns,
where, whereVal, orderBy);
ListView listView = (ListView) findViewById(R.id.listView);
String[] displayFields =
new String[] { MediaStore.Audio.Media.DISPLAY_NAME };
int[] displayViews = new int[] { R.id.songItem };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.song_item, cursor, displayFields, displayViews);
listView.setAdapter(adapter);
}
}
}
谢谢你的帮助。
- - 编辑 - -
谢谢你们的答案。虽然所有答案都很棒,但我选择了 dymmeh 的答案作为我的“接受”答案,因为将视图分成不同的活动似乎是最有意义的(即使这不是我所说的我在寻找的最初的问题)。
我最终创建了以下内容:
第一堂课,展示艺术家:
package music.library;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class MusicLibrary extends Activity implements OnItemClickListener {
Cursor cursor;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String[] columns = {
MediaStore.Audio.Artists._ID,
MediaStore.Audio.Artists.ARTIST
};
cursor = managedQuery(MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI,
columns, null, null, null);
ListView listView = (ListView) findViewById(R.id.listView);
listView.setOnItemClickListener(this);
String[] displayFields = new String[] { MediaStore.Audio.Artists.ARTIST };
int[] displayViews = new int[] { R.id.artistItem };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.artist_item, cursor, displayFields, displayViews);
listView.setAdapter(adapter); }
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
if (cursor.moveToPosition(position)) {
String where = android.provider.MediaStore.Audio.Media.ARTIST
+ "=?";
String whereVal[] = { cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Albums.ARTIST)) };
Intent intent = new Intent(MusicLibrary.this, AlbumSelection.class);
intent.putExtra("where", where);
intent.putExtra("whereVal", whereVal);
startActivity(intent);
}
}
}
第二课,展示专辑:
package music.library;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class AlbumSelection extends Activity implements OnItemClickListener {
Cursor cursor;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Bundle extras = getIntent().getExtras();
String where = extras.getString("where");
String[] whereVal = extras.getStringArray("whereVal");
String[] columns = {
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.ALBUM,
};
String orderBy = android.provider.MediaStore.Audio.Media._ID;
cursor = managedQuery(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI,
columns, where, whereVal, orderBy);
ListView listView = (ListView) findViewById(R.id.listView);
listView.setOnItemClickListener(this);
String[] displayFields = new String[] { MediaStore.Audio.Media.ALBUM };
int[] displayViews = new int[] { R.id.albumItem };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.album_item, cursor, displayFields, displayViews);
listView.setAdapter(adapter); }
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
if (cursor.moveToPosition(position)) {
String where = android.provider.MediaStore.Audio.Media.ALBUM
+ "=?";
String whereVal[] = { cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Albums.ALBUM)) };
Intent intent = new Intent(AlbumSelection.this, SongSelection.class);
intent.putExtra("where", where);
intent.putExtra("whereVal", whereVal);
startActivity(intent);
}
}
}
第三课,展示歌曲:
package music.library;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class SongSelection extends Activity implements OnItemClickListener {
Cursor cursor;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Bundle extras = getIntent().getExtras();
String where = extras.getString("where");
String[] whereVal = extras.getStringArray("whereVal");
String[] columns = {
MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.TITLE,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.MIME_TYPE,
};
String orderBy = android.provider.MediaStore.Audio.Media.TITLE;
cursor = managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
columns, where, whereVal, orderBy);
ListView listView = (ListView) findViewById(R.id.listView);
listView.setOnItemClickListener(this);
String[] displayFields = new String[] { MediaStore.Audio.Media.TITLE };
int[] displayViews = new int[] { R.id.songItem };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.song_item, cursor, displayFields, displayViews);
listView.setAdapter(adapter); }
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
if (cursor.moveToPosition(position)) {
/*Intent intent = new Intent(AlbumSelection.this, SongSelection.class);
intent.putExtra("ARTIST", artist);
startActivity(intent);
*/
}
}
}
这一切都很顺利。
非常感谢所有的回复。我很想听听有关如何整理/提高代码效率的任何反馈。
再次感谢。