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我已經在listview和spinner中成功添加了一些數據。但是當我在模擬器中運行它時，listview和spinner的背景非常輕。我如何讓它們可見？如何讓我的背景變黑？
MainActivity.java
package com.example.task;
//import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.content.Intent;
import android.text.Editable;
import android.text.TextWatcher;
import android.text.format.Time;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.Spinner;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener,OnItemSelectedListener{
private int year;
private int month;
private int day;
LoginDataBaseAdapter loginDataBaseAdapter;
String[] fir;
EditText et1,et2,et3,et4;
Button b1,b2,b3;
Spinner spin;
SeekBar bar;
String str,str1,str2,str3,str4;
Integer i,i1,i3;
static final int DATE_DIALOG_ID = 999;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loginDataBaseAdapter=new LoginDataBaseAdapter(this);
loginDataBaseAdapter=loginDataBaseAdapter.open();
et1=(EditText)findViewById(R.id.edit1);
et2=(EditText)findViewById(R.id.edit2);
et3=(EditText)findViewById(R.id.edit3);
et4=(EditText)findViewById(R.id.edit4);
bar=(SeekBar)findViewById(R.id.seek);
spin=(Spinner)findViewById(R.id.spin);
b1=(Button)findViewById(R.id.button1);
b2=(Button)findViewById(R.id.button2);
b3=(Button)findViewById(R.id.button3);
b1.setOnClickListener(this);
b2.setOnClickListener(this);
b3.setOnClickListener(this);
et3.setOnClickListener(this);
et4.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
bar.setProgress(Integer.parseInt(arg0.toString()));
}
});
fir=getResources().getStringArray(R.array.fir);
ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_dropdown_item_1line,fir);
spin.setAdapter(adapter);
spin.setOnItemSelectedListener(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.main, menu);
return true;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId())
{
case R.id.button1:
str1=et1.getText().toString();
str2=et2.getText().toString();
str3=et3.getText().toString();
str4=et4.getText().toString();
loginDataBaseAdapter.insertEntry(str1, str2,str3,str,str4);
Toast.makeText(getApplicationContext(), "Item added in database", Toast.LENGTH_SHORT).show();
break;
case R.id.button2:
try
{
et1.setText("");
et2.setText("");
et3.setText("");
et4.setText("");
}
catch(Exception e)
{
}
Toast.makeText(getApplicationContext(), "Clicked Cancel", Toast.LENGTH_SHORT).show();
break;
case R.id.button3:
Intent i2=new Intent(MainActivity.this,ListActivity.class);
startActivity(i2);
break;
case R.id.edit3:
showDialog(DATE_DIALOG_ID);
break;
}
}
@Override
@Deprecated
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
switch(id)
{
case DATE_DIALOG_ID:
return new DatePickerDialog(this, datePickerListener,
year, month,day);
}
return null;
}
private DatePickerDialog.OnDateSetListener datePickerListener=new
DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int selectedYear, int selectedMonth, int selectedDay) {
// TODO Auto-generated method stub
year = selectedYear;
month = selectedMonth;
day = selectedDay;
et3.setText(new StringBuilder().append(day).append("-").append(month+1).append("-").append(year).append(" "));
}
};
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
str=spin.getItemAtPosition(arg2).toString();
Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "No text selected", Toast.LENGTH_SHORT).show();
}
}
ListActivity.java
package com.example.task;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class ListActivity extends Activity implements OnItemClickListener{
ListView list1;
String s11;
LoginDataBaseAdapter loginDataBaseAdapter;
ArrayList<HashMap<String, String>> datalist;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
loginDataBaseAdapter=new LoginDataBaseAdapter(this);
loginDataBaseAdapter=loginDataBaseAdapter.open();
list1=(ListView)findViewById(R.id.list);
datalist=loginDataBaseAdapter.getAllAnimals();
ArrayAdapter<HashMap<String, String>> adapter=new ArrayAdapter<HashMap<String,String>>(getApplicationContext(), android.R.layout.simple_dropdown_item_1line,datalist);
list1.setAdapter(adapter);
list1.setOnItemClickListener(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.list, menu);
return true;
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
s11=list1.getItemAtPosition(arg2).toString();
String s12=arg0.getItemAtPosition(arg2).toString();
Intent inte=new Intent(getApplicationContext(),SingleListItem.class);
inte.putExtra("s12", s12);
inte.putExtra("s11", s11);
startActivity(inte);
// Intent intw=new Intent(ListActivity.this,SingleListItem.class);
// startActivity(intw);
}
}
SingleListItem.java
package com.example.task;
import java.util.ArrayList;
import java.util.HashMap;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;
public class SingleListItem extends Activity {
TextView txtName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_single_list_item);
txtName=(TextView)findViewById(R.id.txt_name);
String s1=getIntent().getExtras().getString("s12");
txtName.setText(s1);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.single_list_item, menu);
return true;
}
}
請問您是否可以發佈您的代碼，以便我們可以幫助您？ –