我试图从SQLite数据库表中检索数据并在android中显示为tablelayout。但是它只显示标题和textview。这些代码有什么问题？
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);
}
}
答案 0 :(得分：0)
我认为问题在于挑选错误的布局参数。应该是：
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));
表格布局需要表格布局参数。