Java 当我将内容解析器添加到主活动时,我的应用程序崩溃
下面是我得到的错误日志 E/AndroidRuntime:致命异常:主 进程:com.example.android.apppinventory,PID:14400 java.lang.RuntimeException:无法启动活动组件信息{com.example.android.apppinventory/com.example.android.apppinventory.MainActivity}:java.lang.StringIndexOutOfBoundsException:length=10;regionStart=1;区域长度=-2 在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2581)上 位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2647) 位于android.app.ActivityThread.-wrap11(ActivityThread.java) 在android.app.ActivityThread$H.handleMessage(ActivityThread.java:1502) 位于android.os.Handler.dispatchMessage(Handler.java:111) 位于android.os.Looper.loop(Looper.java:207) 位于android.app.ActivityThread.main(ActivityThread.java:5763) 位于java.lang.reflect.Method.invoke(本机方法) 在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run上(ZygoteInit.java:789) 位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 原因:java.lang.StringIndexOutOfBoundsException:长度=10;regionStart=1;区域长度=-2 位于java.lang.String.StartAndLength(String.java:298) 位于java.lang.String.substring(String.java:1087) 位于android.support.v4.content.FileProvider$SimplePathStrategy.getFileForUri(FileProvider.java:734) 位于android.support.v4.content.FileProvider.query(FileProvider.java:435) 在android.content.ContentProvider.query(ContentProvider.java:1070)中 位于android.content.ContentProvider$Transport.query(ContentProvider.java:249) 位于android.content.ContentResolver.query(ContentResolver.java:498) 位于android.content.ContentResolver.query(ContentResolver.java:441) 位于com.example.android.apppinventory.MainActivity.displayDatabaseInfo(MainActivity.java:69) 位于com.example.android.apppinventory.MainActivity.onStart(MainActivity.java:45) 位于android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1245) 位于android.app.Activity.performStart(Activity.java:6286) 在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544)上 位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2647) 位于android.app.ActivityThread.-wrap11(ActivityThread.java) 在android.app.ActivityThread$H.handleMessage(ActivityThread.java:1502) 位于android.os.Handler.dispatchMessage(Handler.java:111) 位于android.os.Looper.loop(Looper.java:207) 位于android.app.ActivityThread.main(ActivityThread.java:5763) 位于java.lang.reflect.Method.invoke(本机方法) 在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run上(ZygoteInit.java:789) 位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 这是一个库存应用程序。早些时候,我与SQLite数据库交互,应用程序运行良好,但当我添加内容解析器的概念时,应用程序崩溃了。Plz helpJava 当我将内容解析器添加到主活动时,我的应用程序崩溃,java,android,xml,Java,Android,Xml,下面是我得到的错误日志 E/AndroidRuntime:致命异常:主 进程:com.example.android.apppinventory,PID:14400 java.lang.RuntimeException:无法启动活动组件信息{com.example.android.apppinventory/com.example.android.apppinventory.MainActivity}:java.lang.StringIndexOutOfBoundsException:lengt
private void displayDatabaseInfo() {
//InventoryDbHelper mDbHelper = new InventoryDbHelper(this);
//SQLiteDatabase db = mDbHelper.getReadableDatabase();
String[] projection = {
InventoryEntry._ID,
InventoryEntry.PRODUCT_NAME,
InventoryEntry.PRODUCT_DESCRIPTION,
InventoryEntry.PRODUCT_PRICE,
InventoryEntry.PRODUCT_QUANTITY,
InventoryEntry.PRODUCT_IMAGE
};
/**Cursor cursor = db.query(InventoryEntry.TABLE_NAME,projection,null,null,null,null,null);**/
Cursor cursor = getContentResolver().query(InventoryEntry.CONTENT_URI,projection,null,null,null);
//Cursor cursor = getContentResolver().query(InventoryEntry.CONTENT_URI,projection,null,null,null);
TextView displayView = (TextView) findViewById(R.id.text_view);
try {
displayView.setText("Number of rows in table are " + cursor.getCount() + "\n\n");
displayView.append(InventoryEntry._ID + "-" + InventoryEntry.PRODUCT_NAME + "\n");
int idColumnIndex = cursor.getColumnIndex(InventoryEntry._ID);
int nameColumnIndex = cursor.getColumnIndex(InventoryEntry.PRODUCT_NAME);
while (cursor.moveToNext()) {
int currentID = cursor.getInt(idColumnIndex);
String currentName = cursor.getString(nameColumnIndex);
displayView.append("\n" + currentID + "-" + currentName);
}
} finally {
cursor.close();
}
}
问题
private void displayDatabaseInfo() {
//InventoryDbHelper mDbHelper = new InventoryDbHelper(this);
//SQLiteDatabase db = mDbHelper.getReadableDatabase();
String[] projection = {
InventoryEntry._ID,
InventoryEntry.PRODUCT_NAME,
InventoryEntry.PRODUCT_DESCRIPTION,
InventoryEntry.PRODUCT_PRICE,
InventoryEntry.PRODUCT_QUANTITY,
InventoryEntry.PRODUCT_IMAGE
};
/**Cursor cursor = db.query(InventoryEntry.TABLE_NAME,projection,null,null,null,null,null);**/
Cursor cursor = getContentResolver().query(InventoryEntry.CONTENT_URI,projection,null,null,null);
//Cursor cursor = getContentResolver().query(InventoryEntry.CONTENT_URI,projection,null,null,null);
TextView displayView = (TextView) findViewById(R.id.text_view);
StringBuilder sb = new StringBuilder("");
try {
sb.append("Number of rows in table are " + cursor.getCount() + "\n\n");
sb.append(InventoryEntry._ID + "-" + InventoryEntry.PRODUCT_NAME + "\n");
int idColumnIndex = cursor.getColumnIndex(InventoryEntry._ID);
int nameColumnIndex = cursor.getColumnIndex(InventoryEntry.PRODUCT_NAME);
while (cursor.moveToNext()) {
int currentID = cursor.getInt(idColumnIndex);
String currentName = cursor.getString(nameColumnIndex);
sb.append("\n" + currentID + "-" + currentName);
}
displayView.setText(sb.toString());
} finally {
cursor.close();
}
}