在Android表格布局中显示SQLite数据

Question

我试图从SQLite数据库表中检索数据并在Android中显示为tablelayout。 但是，它仅显示标题和textview。 代码有什么问题？

Graf.java

public class Graf extends AppCompatActivity {

DatabaseHelper myDb;
TextView dt, water, inc;
TableLayout tableLayout;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_graf);
    myDb=new DatabaseHelper(this);
    dt=(TextView)findViewById(R.id.date);
    water=(TextView)findViewById(R.id.water);
    inc=(TextView)findViewById(R.id.inc);
    tableLayout=(TableLayout)findViewById(R.id.tableLayout1);



    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    final String date=getDate();
    Toast.makeText(getApplicationContext(),date, Toast.LENGTH_SHORT).show();

    BuildTable(date);




}

private void BuildTable(String date){

    Cursor c=myDb.readEntry(date);

    int rows=c.getCount();
    int cols=c.getColumnCount();

    c.moveToFirst();

    for (int i=0;i<rows;i++){
        TableRow row=new TableRow(this);
        row.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));

        for (int j=0;j<cols;j++){
            TextView tv=new TextView(this);
            tv.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
            tv.setBackgroundResource(R.drawable.cell_shape);
            tv.setGravity(Gravity.CENTER);
            tv.setTextSize(18);
            tv.setPadding(0,5,0,5);

            tv.setText(c.getString(j));

            row.addView(tv);
        }

        c.moveToNext();

        tableLayout.addView(row);
    }


}





/*public void getData(){

    buttonA.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {


                Cursor res = myDb.getAllData();
                if (res.getCount() == 0) {
                    showMessage("Ralat", "Tiada Rekod.");
                }

                StringBuffer buffer = new StringBuffer();
                while (res.moveToNext()) {
                    buffer.append("Tarikh       : " + res.getString(1) + "\n");
                    buffer.append("Air Diminum  : " + res.getString(2) + "\n");
                    buffer.append("Pencapaian   : " + res.getString(3) + "\n\n");
                    showMessage("Laporan", buffer.toString());
                }


        }
    });
}

public void showMessage(String title, String message){
    AlertDialog.Builder builder=new AlertDialog.Builder(this);
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.show();
}*/



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_graf, menu);
    return true;
}

private String getDate() {
    SimpleDateFormat dateFormat = new SimpleDateFormat(
            "yyyy-MM-dd", Locale.getDefault());
    Date date = new Date();
    return dateFormat.format(date);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}

activity_graf.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
tools:context="info.androidhive.materialdesign.activity.Graf">

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:textSize="45dp"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="LAPORAN MINGGUAN ANDA"
    android:id="@+id/textView7"
    android:textStyle="bold"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />



<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Tarikh" />

    <TextView
        android:id="@+id/water"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Penambahan Air" />

    <TextView
        android:id="@+id/inc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Peningkatan Peratus" />
</LinearLayout>

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TableLayout
        android:id="@+id/tableLayout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="10dp">
    </TableLayout>
</ScrollView>



</LinearLayout>

DatabaseHelper.java

public class DatabaseHelper extends SQLiteOpenHelper {

DatabaseHelper myDb;
SQLiteDatabase db = this.getWritableDatabase();

public static final String DATABASE_NAME = "HU.db";
public static final String TABLE_NAME = "User_table";
public static final String COL_1 = "ID";
public static final String COL_2 = "NAME";
public static final String COL_4 = "GENDER";
public static final String COL_5 = "WEIGHT";
public static final String COL_6 = "HEIGHT";
public static final String COL_7 = "ACTIVENESS";
public static final String COL_8 = "TARGET";

public static final String TABLE2_NAME = "Drink_Table";
public static final String COL2_1 = "DRINK_ID";
public static final String COL2_2 = "DATE";
public static final String COL2_3 = "AMOUNT";
public static final String COL2_4 = "PERCENT";
public static final String COL2_5 = "ID";

public DatabaseHelper(Context context) {
    super(context, DATABASE_NAME, null, 1);

}

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL("create table " + TABLE_NAME + "(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, GENDER TEXT, WEIGHT DOUBLE, HEIGHT DOUBLE, ACTIVENESS INTEGER, TARGET DOUBLE)");
    db.execSQL("create table " + TABLE2_NAME + " (DRINK_ID INTEGER PRIMARY KEY AUTOINCREMENT, DATE DATETIME DEFAULT CURRENT_DATE, AMOUNT DOUBLE, PERCENT DOUBLE, ID INTEGER, FOREIGN KEY(ID) REFERENCES " + TABLE_NAME + "(ID))");
    db.execSQL("create table "+TABLE3_NAME+" (Entry_ID INTEGER PRIMARY KEY  AUTOINCREMENT  NOT NULL , ID INTEGER, DATE DATETIME DEFAULT CURRENT_DATE, TOTALAMOUNT DOUBLE, TOTAL PERC DOUBLE, FOREIGN KEY(DATE) REFERENCES "+TABLE2_NAME+"(DATE), FOREIGN KEY(ID) REFERENCES "+TABLE_NAME+"(ID))");


}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("DROP TABLE IF EXIST " + TABLE_NAME);
    onCreate(db);

}

public boolean insertData(String name, String gender, String weight, String height, String activeness, String target) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(COL_2, name);
    contentValues.put(COL_4, gender);
    contentValues.put(COL_5, weight);
    contentValues.put(COL_6, height);
    contentValues.put(COL_7, activeness);
    contentValues.put(COL_8, target);
    long result = db.insert(TABLE_NAME, null, contentValues);
    if (result == -1)
        return false;
    else
        return true;

}

public boolean updateData(String id, String name, String gender, String weight, String height, String activeness, String target) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(COL_1, id);
    contentValues.put(COL_2, name);
    contentValues.put(COL_4, gender);
    contentValues.put(COL_5, weight);
    contentValues.put(COL_6, height);
    contentValues.put(COL_7, activeness);
    contentValues.put(COL_8, target);
    db.update(TABLE_NAME, contentValues, "ID = ?", new String[]{id});
    return true;
}

public boolean addWater(String date, String id, double amount) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    double target = getTargetu(id);
    contentValues.put(COL2_2, date);
    contentValues.put(COL2_3, amount);
    contentValues.put(COL2_4, (amount / target) * 100);
    contentValues.put(COL2_5, id);
    long result = db.insert(TABLE2_NAME, null, contentValues);
    if (result == -1)
        return false;
    else
        return true;

}

 public Cursor readEntry(String date) {
    SQLiteDatabase db = this.getWritableDatabase();
    String selectQuery = ("SELECT DATE, AMOUNT, PERCENT FROM "+TABLE2_NAME+"WHERE DATE= ?");
    Cursor c = db.query(TABLE2_NAME,new String[]{COL2_2,COL2_3,COL2_4},COL2_2+"=?", new String[] { String.valueOf(date)}, null, null, null, null);

    if (c != null) {
        c.moveToFirst();
    }
    return c;

}

private String getDate() {
    SimpleDateFormat dateFormat = new SimpleDateFormat(
            "yyyy-MM-dd", Locale.getDefault());
    Date date = new Date();
    return dateFormat.format(date);
}
}

Answer 1

我认为问题在于选择了错误的布局参数。 应该：

row.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT,
    TableRow.LayoutParams.WRAP_CONTENT));
tv.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,
    TableRow.LayoutParams.WRAP_CONTENT));

表布局需要表布局参数。