【IT168技术】Spinner用来显示列表项，类似于一组单选框RadioButton.下面瞥一下它的效果。
一、概述
Spinner是一个每次只能选择所有项的一个项的控件。它的项来自于与之相关联的适配器中。
二、重要属性
android:prompt：当Spinner对话框关闭时显示该提示
三、重要方法
setPrompt(CharSequence prompt)：设置当Spinner对话框关闭时显示的提示
performClick()：如果它被定义就调用此视图的OnClickListener
setOnItemClickListener(AdapterView.OnItemClickListener l)：当项被点击时调用
onDetachedFromWindow()：当Spinner脱离窗口时被调用。
四、完整代码
public class SpinnerDemo extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.spinnerpage);
Spinner s1 = (Spinner) findViewById(R.id.spinnercolor);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.colors, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s1.setAdapter(adapter);
s1.setOnItemSelectedListener(
new OnItemSelectedListener() {
public void onItemSelected(
AdapterView<?> parent, View view, int position, long id) {
showToast("Spinner1: position=" + position + " id=" + id);
}
public void onNothingSelected(AdapterView<?> parent) {
showToast("Spinner1: unselected");
}
});
Spinner s2 = (Spinner) findViewById(R.id.spinnerplanet);
adapter = ArrayAdapter.createFromResource(this, R.array.planets,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s2.setAdapter(adapter);
s2.setOnItemSelectedListener(
new OnItemSelectedListener() {
public void onItemSelected(
AdapterView<?> parent, View view, int position, long id) {
showToast("Spinner2: position=" + position+1 + " id=" + id+1);
}
public void onNothingSelected(AdapterView<?> parent) {
showToast("Spinner2: unselected");
}
});
}
private void showToast(CharSequence msg) {
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.spinnerpage);
Spinner s1 = (Spinner) findViewById(R.id.spinnercolor);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.colors, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s1.setAdapter(adapter);
s1.setOnItemSelectedListener(
new OnItemSelectedListener() {
public void onItemSelected(
AdapterView<?> parent, View view, int position, long id) {
showToast("Spinner1: position=" + position + " id=" + id);
}
public void onNothingSelected(AdapterView<?> parent) {
showToast("Spinner1: unselected");
}
});
Spinner s2 = (Spinner) findViewById(R.id.spinnerplanet);
adapter = ArrayAdapter.createFromResource(this, R.array.planets,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s2.setAdapter(adapter);
s2.setOnItemSelectedListener(
new OnItemSelectedListener() {
public void onItemSelected(
AdapterView<?> parent, View view, int position, long id) {
showToast("Spinner2: position=" + position+1 + " id=" + id+1);
}
public void onNothingSelected(AdapterView<?> parent) {
showToast("Spinner2: unselected");
}
});
}
private void showToast(CharSequence msg) {
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
}
