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850天前import android.app.Activity; |
import android.os.Bundle; |
import android.view.View; |
import android.widget.AdapterView; |
import android.widget.ArrayAdapter; |
import android.widget.Button; |
import android.widget.EditText; |
import android.widget.Spinner; |
import android.widget.TextView; |
import java.util.ArrayList; |
import java.util.List; |
public class EX04_09 extends Activity { |
private static final String[] countriesStr = { "春节", "元宵节", "植树节", "清明节" }; |
private TextView myTextView; |
private EditText myEditText; |
private Button myButton_add; |
private Button myButton_remove; |
private Spinner mySpinner; |
private ArrayAdapter adapter; |
private List allCountries; |
/** Called when the activity is first created. */ |
@Override |
public void onCreate(Bundle savedInstanceState) { |
super.onCreate(savedInstanceState); |
setContentView(R.layout.main); |
allCountries = new ArrayList(); |
for (int i = 0; i < countriesStr.length; i++) { |
allCountries.add(countriesStr[i]); |
} |
/* new ArrayAdapter物件并将allCountries传入 */ |
adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, |
allCountries); |
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); |
myTextView = (TextView) findViewById(R.id.myTextView); |
myEditText = (EditText) findViewById(R.id.myEditText); |
myButton_add = (Button) findViewById(R.id.myButton_add); |
myButton_remove = (Button) findViewById(R.id.myButton_remove); |
mySpinner = (Spinner) findViewById(R.id.mySpinner); |
/* 将ArrayAdapter加入Spinner对象中 */ |
mySpinner.setAdapter(adapter); |
/* 将myButton_add加入OnClickListener */ |
myButton_add.setOnClickListener(new Button.OnClickListener() { |
@Override |
public void onClick(View arg0) { |
String newCountry = myEditText.getText().toString(); |
/* 先比对新增的值是否已存在，不存在才可新增 */ |
for (int i = 0; i < adapter.getCount(); i++) { |
if (newCountry.equals(adapter.getItem(i))) { |
return; |
} |
} |
if (!newCountry.equals("")) { |
adapter.add(newCountry); |
/* 取得新增的值的位置 */ |
int position = adapter.getPosition(newCountry); |
/* 将Spinner选取在新增的值的位置 */ |
mySpinner.setSelection(position); |
/* 将myEditText清空 */ |
myEditText.setText(""); |
} |
} |
}); |
/* 将myButton_remove加入OnClickListener */ |
myButton_remove.setOnClickListener(new Button.OnClickListener() { |
@Override |
public void onClick(View arg0) { |
if (mySpinner.getSelectedItem() != null) { |
/* 移除mySpinner的值 */ |
adapter.remove(mySpinner.getSelectedItem().toString()); |
/* 将myEditText清空 */ |
myEditText.setText(""); |
if (adapter.getCount() == 0) { |
/* 将myTextView清空 */ |
myTextView.setText(""); |
} |
} |
} |
}); |
/* 将mySpinner加入OnItemSelectedListener */ |
mySpinner |
.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() { |
@Override |
public void onItemSelected(AdapterView arg0, View arg1, |
int arg2, long arg3) { |
/* 将所选mySpinner的值带入myTextView中 */ |
myTextView.setText(arg0.getSelectedItem().toString()); |
} |
@Override |
public void onNothingSelected(AdapterView arg0) { |
} |
}); |
} |
} |
