Android相册艺术GridView

我是Android开发的新手，我正在开发一款媒体播放器应用程序作为学习体验。我目前正在尝试添加一个菜单视图，它在gridview中利用相册艺术。这是我的密码：

public class coverMenu extends Activity {

 private Cursor audioCursor;
 public String artistInput;
 private static final String TAG = "coverMenu";

 @Override
 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.cover);
        Bundle data = this.getIntent().getExtras();
        String artistKey = data.getString("artistPass");


       Toast.makeText(this, artistKey, Toast.LENGTH_LONG).show();

       audioCursor = getContentResolver().query(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null, 
         MediaStore.Audio.Albums.ARTIST + "='" + artistKey + "'", null,MediaStore.Audio.Albums.ALBUM + " ASC");
        startManagingCursor(audioCursor);

        String[]from = new String[]{MediaStore.Audio.Albums.ALBUM_ART};


        int[] to = new int []{android.R.id.text1};

        ListAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1,
          audioCursor, from, to);
        GridView gridview = (GridView) findViewById(R.id.gridview);
         gridview.setAdapter(mAdapter);

我的问题是网格项现在列出了艺术的路径，但没有显示它。有人能帮我解释一下如何将其解析为位图并发送到gridview吗

我花了一些时间研究Android音乐播放器的股票，但找不到一个简单的解决方案

感谢您的帮助

[最新调试：]

DalvikVM[localhost:8615]    
    Thread [<3> main] (Suspended (exception RuntimeException))  
        ActivityThread.performLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2496  
        ActivityThread.handleLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2512   
        ActivityThread.access$2200(ActivityThread, ActivityThread$ActivityRecord, Intent) line: 119 
        ActivityThread$H.handleMessage(Message) line: 1863  
        ActivityThread$H(Handler).dispatchMessage(Message) line: 99 
        Looper.loop() line: 123 
        ActivityThread.main(String[]) line: 4363    
        Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
        Method.invoke(Object, Object...) line: 521  
        ZygoteInit$MethodAndArgsCaller.run() line: 860  
        ZygoteInit.main(String[]) line: 618 
        NativeStart.main(String[]) line: not available [native method]  
    Thread [<13> Binder Thread #2] (Running)    
    Thread [<11> Binder Thread #1] (Running)    
    Thread [<15> Binder Thread #3] (Running)

DalvikVM[localhost:8615]
线程[main]（挂起（异常运行时异常））
ActivityThread.performLaunchActivity（ActivityThread$ActivityRecord，Intent）行：2496
ActivityThread.handleLaunchActivity（ActivityThread$ActivityRecord，Intent）行：2512
ActivityThread.access$2200（ActivityThread，ActivityThread$ActivityRecord，Intent）行：119
ActivityThread$H.handleMessage（消息）行：1863
ActivityThread$H（处理程序）。dispatchMessage（消息）行：99
Looper.loop（）行：123
ActivityThread.main（字符串[]）行：4363
invokenactive（Object，Object[]，Class，Class[]，Class，int，boolean）行：不可用[本机方法]
调用（对象，对象…）行：521
ZygoteInit$MethodAndArgsCaller.run（）行：860
颧骨单位。主（字符串[]）行：618
NativeStart.main（字符串[]）行：不可用[本机方法]
螺纹[活页夹螺纹#2]（运行）
螺纹[活页夹螺纹#1]（运行）
螺纹[活页夹螺纹#3]（运行）

您需要创建一个自定义适配器类，该类根据光标的位置返回填充的网格视图项。这里有一个相当粗糙的例子

自定义_grid_item.xml：

<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView android:id="@+id/album_image"
android:layout_height="wrap_content" android:layout_width="wrap_content">
</ImageView>
</LinearLayout>

活动：

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.GridView;
import android.widget.Toast;

public class CoverMenu extends Activity {
private Cursor audioCursor;
public String artistInput;
private static final String TAG = "coverMenu";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

// Set to some artist you know
String artistKey = "Devo";

Toast.makeText(this, artistKey, Toast.LENGTH_LONG).show();

audioCursor = getContentResolver().query(
        MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null,
        MediaStore.Audio.Albums.ARTIST + "='" + artistKey + "'", null,
        MediaStore.Audio.Albums.ALBUM + " ASC");
startManagingCursor(audioCursor);

String[] from = new String[] { MediaStore.Audio.Albums.ALBUM_ART };

int[] to = new int[] { android.R.id.text1 };

MySimpleListAdapter mAdapter = new MySimpleListAdapter(this,
        android.R.layout.simple_list_item_1, audioCursor, from, to);

GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(mAdapter);
}}

---

请从中查看这段精彩的视频，它将在将来对您有很大帮助。

单击导致主活动的“艺术家”列表时捕捉强制关闭。线程[main]（挂起（异常运行时异常））活动线程。性能启动活动（活动线程$ActivityRecord，意图）行：2496 ActivityThread.handleLaunchActivity（ActivityThread$ActivityRecord，Intent）行：2512 ActivityThread.access$2200（ActivityThread，ActivityThread$ActivityRecord，Intent）行：119 ActivityThread$H.handleMessage（Message）行：1863 ActivityThread$H（Handler）。dispatchMessage（Message）行：99 loop.loop（）行：123 ActivityThread.main（String[]）行：4363方法。invokenactive（Object，Object[]，Class，Class[]，Class，int，boolean）行：不可用[native Method]方法。invoke（Object，Object…）行：521 ZygoteInit$MethodAndArgsCaller.run（）行：860 ZygoteInit.main（String[]）行：618 nativestar.main（String[]）行：不可用[native method]谢谢你的帮助。我不是有意回复，也似乎不太感激。没关系，Josh。我在Nexus One上测试了我的，我没有使用任何意图捆绑包，我只是补充了一点，希望你能解决这个问题。我会将它修复到我的（工作）版本。

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.GridView;
import android.widget.Toast;

public class CoverMenu extends Activity {
private Cursor audioCursor;
public String artistInput;
private static final String TAG = "coverMenu";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

// Set to some artist you know
String artistKey = "Devo";

Toast.makeText(this, artistKey, Toast.LENGTH_LONG).show();

audioCursor = getContentResolver().query(
        MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null,
        MediaStore.Audio.Albums.ARTIST + "='" + artistKey + "'", null,
        MediaStore.Audio.Albums.ALBUM + " ASC");
startManagingCursor(audioCursor);

String[] from = new String[] { MediaStore.Audio.Albums.ALBUM_ART };

int[] to = new int[] { android.R.id.text1 };

MySimpleListAdapter mAdapter = new MySimpleListAdapter(this,
        android.R.layout.simple_list_item_1, audioCursor, from, to);

GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(mAdapter);
}}