我有一个微调器，需要在触摸（或按下）时更改背景图像。
我有样式设置，以便显示正确的图像，但我不能为我的生活得到背景图像来改变。
我的activity_main xml上的我的微调代码是：
<Spinner
android:layout_width="220dp"
android:layout_height="wrap_content"
android:id="@+id/spinner"
style="@style/SpinnerDropdown1"
android:layout_marginTop="450dp"
android:layout_centerHorizontal="true"
android:entries="@array/counties"/>
这是我的@ style / SpinnerDropDown1代码：
<Resources>
<style name="SpinnerDropdown1" parent="android:TextAppearance.Widget.TextView.SpinnerItem">
<item name="android:background">@drawable/unpressed</item>
<item name="android:textColor">#ffffff</item>
<item name="android:divider">#ffffff</item>
<item name="android:dividerHeight">1dp</item>
</style>
</Resources
，这是我的MainActivity.class
public class MainActivity extends ActionBarActivity implements OnItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Spinner spinner = (Spinner) findViewById(R.id.spinner);
final ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.counties, R.layout.my_spinner_items);
adapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setSelection(0);
spinner.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
spinner.setBackgroundResource(R.drawable.pressed);
return false;
}
});
spinner.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int pos, long id) {
switch(pos) {
case 1:
Intent j = new Intent (MainActivity.this, JasperOptions.class);
startActivity(j);
break;
case 2:
Intent k = new Intent(MainActivity.this, LakeOptions.class);
startActivity(k);
break;
case 3:
Intent l = new Intent(MainActivity.this, LaporteOptions.class);
startActivity(l);
break;
case 4:
Intent n = new Intent(MainActivity.this, NewtonOptions.class);
startActivity(n);
break;
case 5:
Intent p = new Intent(MainActivity.this, PorterOptions.class);
startActivity(p);
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
}
});
}
@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 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();
return id == R.id.action_settings || super.onOptionsItemSelected(item);
}
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int pos, long l) {
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
}
}