我正在开发一个关于android的日历;我尝试在GridView中获取一些数据,但我发现我的适配器没有任何问题
问题是,当我使用GridView启动活动时应用程序正在关闭,因此我删除了GridView,然后活动正在运行。
我编辑了我的GridView,但它没有工作
这是我的GridView的xml文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">`
<TextView
android:id="@+id/Month"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<GridView
android:id="@+id/Calendar"
android:numColumns="auto_fit"
android:gravity="center"
android:columnWidth="50dp"
android:stretchMode="columnWidth"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</GridView>
</LinearLayout>`
这是我要插入GridView单元格的xml文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">`
<TextView
android:id="@+id/day"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="40sp" />
</LinearLayout>`
这是我的java文件,但我认为它没有任何问题:
package com.example.damian.schulkalender;
public class Kalender extends ActionBarActivity {
private static boolean loginSuccsessful = false;
private GridView calendar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_kalender);
calendar = (GridView) findViewById(R.id.Calendar);
initDatabase();
calendar.setAdapter(new KalenderAdapter(this));
}
@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_kalender, menu);
return true;
}
@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;
}
if (id == R.id.action_login) {
Intent intent = new Intent(this, Login.class);
startActivity(intent);
loginSuccsessful = Login.getLoginSuccess();
}
if (id == R.id.action_vertretungsplan) {
Intent intent = new Intent(this, Vertretungsplan.class);
startActivity(intent);
}
if (id == R.id.action_stundenplan) {
Intent intent = new Intent(this, Stundenplan.class);
startActivity(intent);
}
return super.onOptionsItemSelected(item);
}
private void initDatabase() {
try {
Class.forName("org.postgresql.Driver");
} catch (ClassNotFoundException e) {
return;
}
Connection connection = null;
String url = "jdbc:postgresql://10.0.2.2/Seminarkurs" +
"?sslfactory=org.postgresql.ssl.NonValidationgFactory" +
"&ssl=true";
try {
connection = DriverManager.getConnection(url , "postgres", "postgres");
Toast.makeText(getApplicationContext(), "Connection successful!", Toast.LENGTH_LONG).show();
} catch (SQLException e) {
Toast.makeText(getApplicationContext(), "Connection Failed! Check output console", Toast.LENGTH_LONG).show();
e.printStackTrace();
return;
}
}
class KalenderData {
int day;
int month;
String events;
int eventDate;
KalenderData(int day,int month, String events, int eventDate) {
this.day = day;
this.month = month;
this.events = events;
this.eventDate = eventDate;
}
}
class KalenderAdapter extends BaseAdapter {
ArrayList<KalenderData> list;
Context context;
KalenderAdapter(Context context) {
this.context = context;
list = new ArrayList<KalenderData>();
int[] amountOfDays = {31,28,31,30,31,30,31,31,30,31,30,31};
int[] month = {1,2,3,4,5,6,7,8,9,10,11,12};
int[] days;
for(int k = 0; k < month.length; k++) {
for (int i = 0; i < amountOfDays[i]; i++) {
days = new int[amountOfDays[month[k]]];
for (int l = 0; l < amountOfDays[month[k]]; l++) {
days[l] = (amountOfDays[month[k]]) - amountOfDays[month[k] - (l + 1)];
//Konstruktor ist falsch initialisiert
KalenderData tempData = new KalenderData(days[l], month[k], null, 0);
list.add(tempData);
}
}
}
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
class ViewHolder{
TextView data;
ViewHolder(View view){
data = (TextView) view.findViewById(R.id.day);
}
}
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder = null;
if (row == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.single_day, parent, false);
holder = new ViewHolder(row);
row.setTag(holder);
}else{
holder = (ViewHolder) row.getTag();
}
KalenderData temp = list.get(position);
holder.data.setText(temp.day);
return row;
}
}
答案 0 :(得分:1)
在将活动附加到xml文件之前,您尝试对视图进行充气。你应该移动
calendar = (GridView) findViewById(R.id.Calendar);
在setContentView
方法调用之后。
并在你宣布假期
private GridView calendar;