我想用RecyclerView ListView的数据填充我的SQLite / ItemDB ...而且我想概括所有数据，例如：
我的数据（在数据库中，标签和金额列）：
RecyclerView / ListView中出现的内容仅为3项：运输，食品和票据......运输2的价值被添加/合并为一个以及票据..
如何通过qazxswpoiand填充我的RecyclerView / ListView做我想做的验证/方法？
用于图片碎片的XML文件：这里我将listView放在pichart下面。
SQLiteJAVA代码片段代码：我将放置listview的java代码
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f6f6f6"
tools:context=".Charts">
<View
android:id="@+id/view"
android:layout_width="match_parent"
android:layout_height="45dp"
android:background="@color/pastelPink"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView18"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:fontFamily="@font/montserrat"
android:text="Distribution Chart"
android:textColor="#fefefe"
android:textSize="25dp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="@+id/view"
app:layout_constraintEnd_toEndOf="@+id/view"
app:layout_constraintStart_toStartOf="@+id/view"
app:layout_constraintTop_toTopOf="@+id/view" />
<com.razerdp.widget.animatedpieview.AnimatedPieView
android:id="@+id/animatedPieChart"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="@+id/textView6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/view" />
<TextView
android:id="@+id/textView6"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="152dp"
android:fontFamily="@font/montserrat"
android:text="Data tablehere (Expenses okung ano man andito sa baba)"
android:textColor="#242a2c"
android:textSize="20dp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
项目数据库帮助
package com.example.admin.test2;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.DecelerateInterpolator;
import com.razerdp.widget.animatedpieview.AnimatedPieView;
import com.razerdp.widget.animatedpieview.AnimatedPieViewConfig;
import com.razerdp.widget.animatedpieview.data.SimplePieInfo;
public class Charts extends Fragment {
AnimatedPieView mAnimatedPieView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_charts, container, false);
mAnimatedPieView = view.findViewById(R.id.animatedPieChart);
drawPie();
return view;
}
public void drawPie() {
AnimatedPieViewConfig config = new AnimatedPieViewConfig();
config.startAngle(-90)// Starting angle offset
.addData(new SimplePieInfo(30, Color.parseColor("#77dd77"), "Sample Data to"))//Data (bean that implements the IPieInfo interface)
.addData(new SimplePieInfo(18.0f, Color.parseColor("#ff6961"), "Sample Data ulet")).drawText(true)
.duration(3000);// draw pie animation duration
config.floatShadowRadius(18f);
config.floatUpDuration(500);
config.interpolator(new DecelerateInterpolator(4f));
// The following two sentences can be replace directly 'mAnimatedPieView.start (config); '
mAnimatedPieView.applyConfig(config);
mAnimatedPieView.start();
}
}
项目合同
package com.example.admin.test2;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import com.example.admin.test2.ItemContract.*;
public class ItemDBHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "itemlist.db";
public static final int DATABASE_VERSION = 4;
public ItemDBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
final String SQL_CREATE_ITEMLIST_TABLE = "CREATE TABLE " + ItemEntry.TABLE_NAME + " (" +
ItemEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
ItemEntry.COLUMN_LABEL + " TEXT NOT NULL, " +
ItemEntry.COLUMN_DETAIL + " TEXT, " +
ItemEntry.COLUMN_AMOUNT + " INTEGER NOT NULL, " +
ItemEntry.COLUMN_DATE + " TEXT " +
");";
db.execSQL(SQL_CREATE_ITEMLIST_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + ItemEntry.TABLE_NAME);
onCreate(db);
}
}
以下是帮助您入门的高级想法。
我还建议你使用Room库，它大大简化了SQLite的使用。 package com.example.admin.test2;
import android.provider.BaseColumns;
public class ItemContract {
private ItemContract() {}
public static final class ItemEntry implements BaseColumns
{
public static final String TABLE_NAME = "items";
public static final String COLUMN_LABEL = "label";
public static final String COLUMN_AMOUNT = "amount";
public static final String COLUMN_DETAIL = "detail";
public static final String COLUMN_DATE = "date";
}
}