Android開發之《Android應用開發揭秘》UI事件匯總

以下是Android應用開發揭秘這本書第四章的關於UI的事件處理的總結。基本上都是可以復用的代碼。存著日後方便。

1.EditView控件的setOnKeyListener方法。點擊上下左右鍵或者中間鍵的時候可以出發該方法。代碼如下。

1. myEditView.setOnKeyListener(new EditText.OnKeyListener(){
3. @Override
4. public boolean onKey(View v, int keyCode, KeyEvent event) {
5. myTextView.setText("文本框中內容是："+myEditView.getText().toString());
6. return false;// TODO Auto-generated method stub
7. }
8. });

1. myEditView.setOnKeyListener(new EditText.OnKeyListener(){
3. @Override
4. public boolean onKey(View v, int keyCode, KeyEvent event) {
5. myTextView.setText("文本框中內容是："+myEditView.getText().toString());
6. return false;// TODO Auto-generated method stub
7. }
8. });

2.RadioButton控件和RadioGroup控件的組合使用，代碼如下：

1. myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
3. @Override
4. public void onCheckedChanged(RadioGroup group, int checkedId) {
5. // TODO Auto-generated method stub
6. if(checkedId == myRadioButton3.getId())
7. {
8. DisplayToast("正確答案："+myRadioButton3.getText()+"恭喜你回答正確");
9. }
10. else
11. {
12. DisplayToast("回答錯誤");
13. }
14. }
15. );

1. myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
3. @Override
4. public void onCheckedChanged(RadioGroup group, int checkedId) {
5. // TODO Auto-generated method stub
6. if(checkedId == myRadioButton3.getId())
7. {
8. DisplayToast("正確答案："+myRadioButton3.getText()+"恭喜你回答正確");
9. }
10. else
11. {
12. DisplayToast("回答錯誤");
13. }
14. }
15. );

3.CheckBox控件的使用，代碼如下：

1. myCheckBox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){
2. @Override
3. public void onCheckedChanged(CompoundButton buttonView,
4. boolean isChecked) {
5. // TODO Auto-generated method stub
6. if(myCheckBox1.isChecked()){
7. DisplayToast("你選擇了："+myCheckBox1.getText());
8. }
9. }
10. });

1. myCheckBox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){
2. @Override
3. public void onCheckedChanged(CompoundButton buttonView,
4. boolean isChecked) {
5. // TODO Auto-generated method stub
6. if(myCheckBox1.isChecked()){
7. DisplayToast("你選擇了："+myCheckBox1.getText());
8. }
9. }
10. });

4.Button控件的使用，代碼如下：

1. myButton1.setOnClickListener(new Button.OnClickListener(){
2. @Override
3. public void onClick(View v) {
4. }
5. });

1. myButton1.setOnClickListener(new Button.OnClickListener(){
2. @Override
3. public void onClick(View v) {
4. }
5. });

4.Spinner控件的使用，代碼如下：

1. //Spinner控件需要跟ArrayAdapter綁定使用。
2. private static final String[] m_Countries = {"A型","B型","O型","AB型","未知類型"};
3. private Spinner mySpinner;
4. private ArrayAdapter<String> myAdapter;
5. mySpinner = (Spinner)findViewById(R.id.mySpinner1);
6. myAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m_Countries);
7. //設置下拉列表風格
8. myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
9. //將adapter添加到mySpinner中
10. mySpinner.setAdapter(myAdapter);
11. //添加事件監聽
12. mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
13. @Override
14. public void onItemSelected(AdapterView<?> arg0, View arg1,
15. int arg2, long arg3) {
16. // TODO Auto-generated method stub
17. myTextView.setText("你的血型是"+ m_Countries[arg2]);
18. arg0.setVisibility(View.VISIBLE);
19. }
20. @Override
21. public void onNothingSelected(AdapterView<?> arg0) {
22. // TODO Auto-generated method stub
23. DisplayToast("你什麼也沒選！");
24. }
25. });

1. //Spinner控件需要跟ArrayAdapter綁定使用。
2. private static final String[] m_Countries = {"A型","B型","O型","AB型","未知類型"};
3. private Spinner mySpinner;
4. private ArrayAdapter<String> myAdapter;
5. mySpinner = (Spinner)findViewById(R.id.mySpinner1);
6. myAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m_Countries);
7. //設置下拉列表風格
8. myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
9. //將adapter添加到mySpinner中
10. mySpinner.setAdapter(myAdapter);
11. //添加事件監聽
12. mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
13. @Override
14. public void onItemSelected(AdapterView<?> arg0, View arg1,
15. int arg2, long arg3) {
16. // TODO Auto-generated method stub
17. myTextView.setText("你的血型是"+ m_Countries[arg2]);
18. arg0.setVisibility(View.VISIBLE);
19. }
20. @Override
21. public void onNothingSelected(AdapterView<?> arg0) {
22. // TODO Auto-generated method stub
23. DisplayToast("你什麼也沒選！");
24. }
25. });