LoadViewでListViewを塗りつぶす方法は？

Question

私はDeveloper siteでListViewの例をテストしています。これは、LoadViewとAdapterでListViewを埋め込む例です。アプリは不明なバグのために失敗します。私は確信していませんが、文getLoaderManager().initLoader(0, null, this);に問題があると思われます。

エミュレータには「残念なことにListViewLoaderが停止しました」と表示されます。 <uses-permission android:name="android.permission.READ_CONTACTS" />の前に<application>タグの前にも使用しましたが、同じエラーが発生しました。マニフェストファイル内にあります。次のコード内の任意の問題を見つけるために事前に

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09-25 22:57:33.853 28524-28618/com.example.listviewloader E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1 
Process: com.example.listviewloader, PID: 28524 
java.lang.RuntimeException: An error occurred while executing doInBackground() 
at android.os.AsyncTask$3.done(AsyncTask.java:309) 
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354) 
at java.util.concurrent.FutureTask.setException(FutureTask.java:223) 
at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
at java.lang.Thread.run(Thread.java:818) 
Caused by: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.contacts.ContactsProvider2 from ProcessRecord{3c98c11 28524:com.example.listviewloader/u0a108} (pid=28524, uid=10108) requires android.permission.READ_CONTACTS or android.permission.WRITE_CONTACTS 
at android.os.Parcel.readException(Parcel.java:1599) 
at android.os.Parcel.readException(Parcel.java:1552) 
at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:3550) 
at android.app.ActivityThread.acquireProvider(ActivityThread.java:4778) 
at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2018) 
at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1468) 
at android.content.ContentResolver.query(ContentResolver.java:475) 
at android.content.CursorLoader.loadInBackground(CursorLoader.java:64) 
at android.content.CursorLoader.loadInBackground(CursorLoader.java:56) 
    at android.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:312) 
    at android.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:69) 
    at android.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:66) 
    at android.os.AsyncTask$2.call(AsyncTask.java:295) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)  
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)  
    at java.lang.Thread.run(Thread.java:818)  09-25 22:57:33.859 28524-28621/com.example.listviewloader D/OpenGLRenderer: Use 
EGL_SWAP_BEHAVIOR_PRESERVED: true 
09-25 22:57:33.863 28524:28524 D/ ] 
HostConnection::get() New Host Connection established 0xaa9e84a0, tid 28524 
    09-25 22:57:34.200 28524-28621/com.example.listviewloader I/OpenGLRenderer: Initialized EGL, version 1.4 
    09-25 22:57:34.910 28524-28621/com.example.listviewloader E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb40943e0 

ありがとう：logcatは、次のメッセージが表示されます。

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import android.app.ListActivity; 
import android.content.CursorLoader; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.provider.ContactsContract; 
import android.support.v4.widget.DrawerLayout; 
import android.util.Log; 
import android.view.Gravity; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ListView; 
import android.widget.ProgressBar; 
import android.app.LoaderManager; 
import android.content.Loader; 
import android.widget.SimpleCursorAdapter; 
import android.widget.Toast;  

public class MainActivity extends ListActivity 
    implements LoaderManager.LoaderCallbacks<Cursor> { 

// This is the Adapter being used to display the list's data 
SimpleCursorAdapter mAdapter; 

// These are the Contacts rows that we will retrieve 
static final String[] PROJECTION = new String[] {ContactsContract.Data._ID, 
     ContactsContract.Data.DISPLAY_NAME}; 

// This is the select criteria 
static final String SELECTION = "((" + 
     ContactsContract.Data.DISPLAY_NAME + " NOTNULL) AND (" + 
     ContactsContract.Data.DISPLAY_NAME + " != ''))"; 

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

    // For the cursor adapter, specify which columns go into which views 
    String[] fromColumns = {ContactsContract.Data.DISPLAY_NAME}; 
    int[] toViews = {android.R.id.text1}; // The TextView in simple_list_item_1 

    // Create an empty adapter we will use to display the loaded data. 
    // We pass null for the cursor, then update it in onLoadFinished() 
    mAdapter = new SimpleCursorAdapter(this, 
      android.R.layout.simple_list_item_1, null, 
      fromColumns, toViews, 0); 
    setListAdapter(mAdapter); 

    // Prepare the loader. Either re-connect with an existing one, 
    // or start a new one. 
    getLoaderManager().initLoader(0, null, this); //this seems to be wrong 
} 

// Called when a new Loader needs to be created 
public Loader<Cursor> onCreateLoader(int id, Bundle args) { 
    // Now create and return a CursorLoader that will take care of 
    // creating a Cursor for the data being displayed. 

    return new CursorLoader(this, ContactsContract.Data.CONTENT_URI, 
      PROJECTION, SELECTION, null, null); 
} 

// Called when a previously created loader has finished loading 
public void onLoadFinished(Loader<Cursor> loader, Cursor data) { 
    // Swap the new cursor in. (The framework will take care of closing the 
    // old cursor once we return.) 
    mAdapter.swapCursor(data); 
} 

// Called when a previously created loader is reset, making the data unavailable 
public void onLoaderReset(Loader<Cursor> loader) { 
    // This is called when the last Cursor provided to onLoadFinished() 
    // above is about to be closed. We need to make sure we are no 
    // longer using it. 
    mAdapter.swapCursor(null); 
} 

@Override 
public void onListItemClick(ListView l, View v, int position, long id) { 
    // Do something when a list item is clicked 
} 

Answer 1

にSecurityExceptionと許可拒否は可能性の高い原因を与える - あなたはあなたの連絡先を読んで（そしておそらく書き込み）するアプリのアクセス権を与えていますか？

必要な権限は以下のとおりです。

Read access to one or more tables 
<uses-permission android:name="android.permission.READ_CONTACTS">. 
Write access to one or more tables 
<uses-permission android:name="android.permission.WRITE_CONTACTS">. 

Answer 2

によって引き起こさ：java.lang.SecurityException：許可拒否：オープニングプロバイダ com.android.providers.contacts.ContactsProvider

場合アンドロイド6であなたのアプリを実行しているか、あなたのアプリに必要な権限がここに与えられていることを確認してください。example