Android之媒体库（一）

今天和大家分享一下grevian.MediaLibrary中的一些有用的代码，希望大家能在开发中能用上，废话不多说，来撸代码

ItemFoundActivity.java

public class ItemFoundActivity extends Activity {private Media mMedia;private Bundle extras;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.details);extras = getIntent().getExtras();try {mMedia = MediaFactory.getMediaByUPC(this.getBaseContext(),extras.getString("UPC"));} catch (LookupException e) {Toast toast = Toast.makeText(getApplicationContext(),e.getMessage(), Toast.LENGTH_LONG);toast.show();this.finish();return;}TextView titleText = (TextView) findViewById(R.id.TitleText);titleText.setText(String.valueOf(mMedia.getTitle()));final TextView ownedText = (TextView) findViewById(R.id.CopiesText);ownedText.setText(Integer.toString(mMedia.getOwned()));if (mMedia.getLoaned() != "") {TextView loanedText = (TextView) findViewById(R.id.LoanedText);loanedText.setText(mMedia.getLoaned());}// Set up the button to add copiesButton mButton = (Button) findViewById(R.id.AddButton);mButton.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {mMedia.setOwned(mMedia.getOwned() + 1);mMedia.save();ownedText.setText(Integer.toString(mMedia.getOwned()));}});}}

Media.java

import android.content.ContentResolver;import android.content.ContentValues;import android.database.Cursor;import android.net.Uri;public class Media {public static final Uri CONTENT_URI = Uri.parse("content://" + MediaLibrary.AUTHORITY + "/media");public static final Uri SEARCH_URI = Uri.parse("content://" + MediaLibrary.AUTHORITY + "/search/");public static final String CONTENT_TYPE = "vnd.android.cursor.dir/grevian.MediaLibrary.Media";public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/grevian.MediaLibrary.Media";public static final String DEFAULT_SORT_ORDER = "lower(title) ASC";public static final String BARCODE = "barcode";public static final String TITLE = "title";public static final String OWNED = "owned";public static final String LOANED = "LOANED";private String Title;private String UPC;private int Owned;private String Loaned;private ContentResolver cr;public Media(Cursor c, ContentResolver contentResolver) {setTitle(c.getString(c.getColumnIndexOrThrow("title")));setUPC(c.getString(c.getColumnIndexOrThrow("barcode")));setOwned(c.getInt(c.getColumnIndexOrThrow("owned")));setLoaned(c.getString(c.getColumnIndexOrThrow("loaned")));cr = contentResolver;}public void setTitle(String title) {Title = title;}public String getTitle() {return Title;}public void setUPC(String uPC) {UPC = uPC;}public String getUPC() {return UPC;}public void setOwned(int owned) {Owned = owned;}public int getOwned() {return Owned;}public void setLoaned(String loaned) {Loaned = loaned;}public String getLoaned() {return Loaned;}public boolean isLoaned() {if (Loaned == "")return false;elsereturn true;}public void save() {ContentValues mVals = new ContentValues();mVals.put(Media.TITLE, this.Title);mVals.put(Media.OWNED, this.Owned);mVals.put(Media.BARCODE, this.UPC);mVals.put(Media.LOANED, this.Loaned);cr.update(Media.CONTENT_URI, mVals, Media.BARCODE + " = " + this.UPC, null);}}