刚学android，小白求指导，好人么么哒

DD_Wade 2014-10-28 10:50:26

package com.example.androidmp;



import java.util.ArrayList;

import java.util.HashSet;

import java.util.Set;

import android.os.Bundle;

import android.provider.MediaStore;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.ImageButton;

import android.widget.ImageView;

import android.widget.ListView;

import android.widget.SeekBar;

import android.widget.TextView;

import android.app.Activity;

import android.content.ContentResolver;

import android.content.Context;

import android.content.Intent;

import android.content.SharedPreferences;

import android.content.SharedPreferences.Editor;

import android.database.Cursor;



public class MainActivity extends Activity {



	private SharedPreferences sharedPreferences = getSharedPreferences("music", Context.MODE_PRIVATE);

	private Editor editor = sharedPreferences.edit();

	private Set<String> musicSet = new HashSet<String>();



	private ImageView musicPhoto;

	private ListView musicInf;

	private Button button_mode;

	private Button button_list;

	private Button button_voice_up;

	private Button button_voice_down;

	private TextView musicName;

	private SeekBar musicProgress;

	private ImageButton button_previous;

	private ImageButton button_slow;

	private ImageButton button_start_pause;

	private ImageButton button_fast;

	private ImageButton button_next;



	private String currentTitle;

	private String firstTitle;

	private String[] information;

	private ArrayList<String> musicInformation = new ArrayList<String>();

	

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		

		musicPhoto = (ImageButton) findViewById(R.id.musicPhoto);

		musicInf = (ListView) findViewById(R.id.musicInf);

		button_mode = (Button) findViewById(R.id.button_mode);

		button_list = (Button) findViewById(R.id.button_list);

		button_voice_up = (Button) findViewById(R.id.button_voice_up);

		button_voice_down = (Button) findViewById(R.id.button_voice_down);

		musicName = (TextView) findViewById(R.id.musicName);

		musicProgress = (SeekBar) findViewById(R.id.musicProgress);

		button_previous = (ImageButton) findViewById(R.id.music_previous);

		button_slow = (ImageButton) findViewById(R.id.music_slow);

		button_start_pause = (ImageButton) findViewById(R.id.music_start_pause);

		button_fast = (ImageButton) findViewById(R.id.music_fast);

		button_next = (ImageButton) findViewById(R.id.music_next);

		

		MusicScan();

		currentTitle = firstTitle;

		

//		final String data = initial();



		button_start_pause.setOnClickListener(new View.OnClickListener() {



			@Override

			public void onClick(View v) {

				Intent intent = new Intent(MainActivity.this, MusicPlay.class);

				Bundle bundle = new Bundle();

				bundle.putString("musicData", "/mnt/sdcard/Always with me.mp3");

				intent.putExtras(bundle);

				startService(intent);

			}

		});

	}



//	public String initial() {

//		Set<String> currentMusic = sharedPreferences.getStringSet(currentTitle,

//				null);

//		for (int n = 0; currentMusic.iterator().hasNext(); n++) {

//			information[n] = currentMusic.iterator().next();

//		}

//		;

//		String artist = information[0];

//		String data = information[1];

//		String display_name = information[2];

//		String duration = information[3];

//		String id = information[4];

//		String title = information[5];

//

//		musicInformation.add(title);

//		musicInformation.add(artist);

//		musicInformation.add(duration);

//		ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(

//				MainActivity.this, R.layout.item, musicInformation);

//		musicInf.setAdapter(arrayAdapter);

//		musicName.setText(title);

//		return data;

//	}



	public void MusicScan() {

		ContentResolver contentResolver = MainActivity.this

				.getContentResolver();

		Cursor cursor = contentResolver

				.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,

						new String[] { MediaStore.Audio.Media.TITLE,

								MediaStore.Audio.Media._ID,

								MediaStore.Audio.Media.DATA,

								MediaStore.Audio.Media.ARTIST,

								MediaStore.Audio.Media.DURATION,

								MediaStore.Audio.Media.DISPLAY_NAME }, null,

						null, null);

		while (cursor.moveToNext()) {

			String artist = cursor.getString(cursor

					.getColumnIndex(MediaStore.Audio.Media.ARTIST));

			String data = cursor.getString(cursor

					.getColumnIndex(MediaStore.Audio.Media.DATA));

			String display_name = cursor.getString(cursor

					.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));

			String duration = cursor.getString(cursor

					.getColumnIndex(MediaStore.Audio.Media.DURATION));

			String id = cursor.getString(cursor

					.getColumnIndex(MediaStore.Audio.Media._ID));

			String title = cursor.getString(cursor

					.getColumnIndex(MediaStore.Audio.Media.TITLE));

			musicSet.add(artist);

			musicSet.add(data);

			musicSet.add(display_name);

			musicSet.add(duration);

			musicSet.add(id);

			musicSet.add(title);

			editor.putStringSet(title, musicSet);

		}

		cursor.moveToPosition(0);

		firstTitle = cursor.getString(cursor

				.getColumnIndex(MediaStore.Audio.Media.TITLE));

		editor.apply();

	}



	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		menu.add(0, 0, 0, "扫描歌曲");

		menu.add(0, 1, 1, "退出");

		return super.onCreateOptionsMenu(menu);

	}



	@Override

	public boolean onOptionsItemSelected(MenuItem item) {

		switch (item.getItemId()) {

		case 0:

			MusicScan();

			break;



		default:

			MainActivity.this.finish();

			break;

		}

		return super.onOptionsItemSelected(item);

	}

}