与内容提供商合作时，我得到了
无法绑定索引1处的参数，因为索引超出范围。该陈述有0个参数。
我是新手，所以我无法解决错误
MainActivity
helper=new g_dbHelper((this));
SQLiteDatabase sql=helper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put("NAME","Harry Potter");
values.put("PUBLISHER","Bloomberg Publications");
values.put("PRICE",500);
Uri uri1=getContentResolver().insert(uri,values);
// Log.e("ROWID",String.valueOf(newRowId));
String[] name={"NAME"};
displayView = (TextView) findViewById(R.id.textViewa);
SQLiteDatabase sql1=helper.getReadableDatabase();
try {try{
cursor = getContentResolver().query(uri, name, null, null, null);
if (cursor == null)
displayView.setText("Invalid Selection");
else {
cursor.moveToFirst();
int id = cursor.getColumnIndex("NAME");
displayView.setText(cursor.getString(id));
{cursor.close();}}}
catch(IllegalArgumentException e)
{
Log.e("TAG",e.getMessage());
}
}
catch(SQLiteException e)
{
Log.e("TAG","Problem in Reading");
}
g_dbCP.java
public boolean onCreate() {
helper=new g_dbHelper(getContext());
sql=helper.getReadableDatabase();
uriMatcher=new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI("com.example.asus.g_books.provider","first",1);
uriMatcher.addURI("com.example.asus.g_books.provider","first/#",2);
return true;
}
@Nullable
@Override
public Cursor query(@NonNull Uri uri, @Nullable String[] strings, @Nullable
String s, @Nullable String[] strings1, @Nullable String s1) {
int match=uriMatcher.match(uri);
Cursor cursor=null;
switch(match)
{
case 1:
cursor=sql.query("first",strings,s,strings,null,null,s1);
break;
case 2:
s=g_dbHelper.id+"=?";
strings1=new String[]
{String.valueOf(ContentUris.parseId(uri))};
cursor=sql.query("first",strings,s,strings,null,null,s1);
break;
}
return cursor;
}
@Nullable
@Override
public String getType(@NonNull Uri uri) {
return null;
}
@Nullable
@Override
public Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {
SQLiteDatabase sql1=helper.getWritableDatabase();
switch(uriMatcher.match(uri))
{
case 1:
long newRowId = sql1.insert("first",null,values);
return ContentUris.withAppendedId(uri,newRowId);
default:
throw new IllegalStateException("operation failed");
}
}
清单
package="com.example.asus.g_books">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<provider
android:authorities="com.example.asus.g_books.provider"
android:name="com.example.asus.g_books.g_dbCP"/>
</application>
这里我只是在表格中添加一本书的细节。 我们也欢迎任何其他建议和建议。
删除catch块时的错误日志
com.example.asus.g_books E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.asus.g_books, PID: 21491
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.asus.g_books/com.example.asus.g_books.MainActivity}: java.lang.IllegalArgumentException: Cannot bind argument at index 1 because the index is out of range. The statement has 0 parameters.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: java.lang.IllegalArgumentException: Cannot bind argument at index 1 because the index is out of range. The statement has 0 parameters.
at android.database.sqlite.SQLiteProgram.bind(SQLiteProgram.java:212)
at android.database.sqlite.SQLiteProgram.bindString(SQLiteProgram.java:166)
at android.database.sqlite.SQLiteProgram.bindAllArgsAsStrings(SQLiteProgram.java:200)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1318)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1165)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1036)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1204)
at com.example.asus.g_books.g_dbCP.query(g_dbCP.java:42)
at android.content.ContentProvider.query(ContentProvider.java:1020)
at android.content.ContentProvider$Transport.query(ContentProvider.java:239)
at android.content.ContentResolver.query(ContentResolver.java:530)
at android.content.ContentResolver.query(ContentResolver.java:472)
at com.example.asus.g_books.MainActivity.onCreate(MainActivity.java:56)
at android.app.Activity.performCreate(Activity.java:6672)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)