Java 从SQLite检索数据并在另一个类中按行显示
为什么我不能从SQLite检索数据?我错过什么了吗?我已经阅读了许多文档,并试图解决它,但仍然失败 worketailstable.javaJava 从SQLite检索数据并在另一个类中按行显示,java,android,sqlite,Java,Android,Sqlite,为什么我不能从SQLite检索数据?我错过什么了吗?我已经阅读了许多文档,并试图解决它,但仍然失败 worketailstable.java Button btn1=(Button)findViewById(R.id.button2); btn1.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { AlertDialog.Builder
Button btn1=(Button)findViewById(R.id.button2);
btn1.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
AlertDialog.Builder builder=new AlertDialog.Builder(WorkDetailsTable.this);
builder.setTitle("Data Saved");
builder.setMessage("Are you sure you want to save?");
builder.setIcon(android.R.drawable.ic_dialog_alert);
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int ii) {
long ab = ts.insertTimeSheet(name, weather, date, status);
Toast.makeText(context, "Data Saved", Toast.LENGTH_SHORT).show();
Intent intent=new Intent(WorkDetailsTable.this,DisplayData.class);
intent.putExtra("name",name); //name will be used in another class
startActivity(intent);
public class DisplayData extends AppCompatActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.displaydata);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
final String name1 = getIntent().getExtras().getString("name");
Toast.makeText(getApplicationContext(),name1, Toast.LENGTH_SHORT).show();
if(name1.equals("John"))
{
SQLiteDatabase db=(new MyDatabaseHelper(this)).getReadableDatabase();
Cursor cursor=db.rawQuery("SELECT Weather,Date,Status FROM Information WHERE Name = ?",new String[]{""+name1});
if(cursor.getCount()==1)
{
String weather=cursor.getString(cursor.getColumnIndex("Weather"));
String date=cursor.getString(cursor.getColumnIndex("Date"));
String status=cursor.getString(cursor.getColumnIndex("Status"));
}
db.close();
}
DisplayDate.java
Button btn1=(Button)findViewById(R.id.button2);
btn1.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
AlertDialog.Builder builder=new AlertDialog.Builder(WorkDetailsTable.this);
builder.setTitle("Data Saved");
builder.setMessage("Are you sure you want to save?");
builder.setIcon(android.R.drawable.ic_dialog_alert);
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int ii) {
long ab = ts.insertTimeSheet(name, weather, date, status);
Toast.makeText(context, "Data Saved", Toast.LENGTH_SHORT).show();
Intent intent=new Intent(WorkDetailsTable.this,DisplayData.class);
intent.putExtra("name",name); //name will be used in another class
startActivity(intent);
public class DisplayData extends AppCompatActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.displaydata);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
final String name1 = getIntent().getExtras().getString("name");
Toast.makeText(getApplicationContext(),name1, Toast.LENGTH_SHORT).show();
if(name1.equals("John"))
{
SQLiteDatabase db=(new MyDatabaseHelper(this)).getReadableDatabase();
Cursor cursor=db.rawQuery("SELECT Weather,Date,Status FROM Information WHERE Name = ?",new String[]{""+name1});
if(cursor.getCount()==1)
{
String weather=cursor.getString(cursor.getColumnIndex("Weather"));
String date=cursor.getString(cursor.getColumnIndex("Date"));
String status=cursor.getString(cursor.getColumnIndex("Status"));
}
db.close();
}
displaydata.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp" >
<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:stretchColumns="|"
android:layout_marginBottom="25dp">
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tableRow1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView10"
android:background="@drawable/cell_shape"
android:textSize="17sp"
android:text="weather"/>
<TextView android:id="@+id/textView111"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="17sp"
android:background="@drawable/cell_shape"
android:text="date"/>
<TextView android:id="@+id/textView11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="17sp"
android:background="@drawable/cell_shape"
android:text="status"/>
</TableRow>
// <TableRow>
// <TextView android:id="@+id/textView1111"
// android:layout_width="wrap_content"
// android:layout_height="wrap_content"
// android:textSize="17sp"
// android:background="@drawable/cell_shape"/>
</TableRow>
</TableLayout>
</HorizontalScrollView>
</LinearLayout>
</ScrollView>
应检索数据并在另一个类中逐行显示,而不是在editText上。如何实现这一点?单击“是”后,您将转到下一个活动并向其传递名称:
public class DisplayData extends AppCompatActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.displaydata);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
Bundle bundle=getIntent().getExtras();
String name="";
if(bundle!=null)
{
name=bundle.getString("name");
}
//check whether you get the name value here or not..(use log)
SQLiteDatabase db=(new MyDatabaseHelper(this)).getReadableDatabase();
Cursor cursor=db.rawQuery("SELECT Weather,Date,Status FROM Information WHERE Name = ?",new String[]{""+name1});
if(cursor.getCount()==1)
{
String weather=cursor.getString(cursor.getColumnIndex("Weather"));//give the proper index of weather and same for rest.
String date=cursor.getString(cursor.getColumnIndex("Date"));
String status=cursor.getString(cursor.getColumnIndex("Status"));
}
db.close();
}单击“是”后,您将移动到下一个活动并向其传递名称:
public class DisplayData extends AppCompatActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.displaydata);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
Bundle bundle=getIntent().getExtras();
String name="";
if(bundle!=null)
{
name=bundle.getString("name");
}
//check whether you get the name value here or not..(use log)
SQLiteDatabase db=(new MyDatabaseHelper(this)).getReadableDatabase();
Cursor cursor=db.rawQuery("SELECT Weather,Date,Status FROM Information WHERE Name = ?",new String[]{""+name1});
if(cursor.getCount()==1)
{
String weather=cursor.getString(cursor.getColumnIndex("Weather"));//give the proper index of weather and same for rest.
String date=cursor.getString(cursor.getColumnIndex("Date"));
String status=cursor.getString(cursor.getColumnIndex("Status"));
}
db.close();
}您的要求是什么?我的意思是您只想在下一个活动中显示该特定名称的详细信息???从数据库中获取?没错。我希望它显示为一行,而不是在EditText上。您是否尝试使用其他工具运行查询?例如,命令行sqlite3命令?这就是我在调试java部件之前验证数据库部件是否工作的方法。@KağanKayal我不太确定是否使用sqlite3命令,但我确信数据可以插入SQLite。您的要求是什么?我的意思是,您只想在下一个活动中显示该特定名称的详细信息???从数据库中获取?没错。我希望它显示为一行,而不是EditText。您是否尝试使用其他工具运行查询?例如,命令行sqlite3命令?这就是我在调试java部件之前验证数据库部件是否工作的方法。@KağanKayal我不确定是否使用sqlite3命令,但我确定数据可以插入SQliteI使用Toast.makeText(getApplicationContext(),name1,Toast.LENGTH_SHORT).show();我可以得到数值,检查你是否得到天气的数值!!我需要使用set和get方法吗?你得到weather的值了吗?是的,但我希望它以某种方式显示,在特定列下…我使用Toast.makeText(getApplicationContext(),name1,Toast.LENGTH_SHORT)。show();我可以得到数值,检查你是否得到天气的数值!!我需要使用set和get方法吗?你得到天气的值了吗?是的,但我希望它以某种方式显示,在特定列下。。。