Android开发之《Android应用开发揭秘》UI事件汇总
Android开发之《Android应用开发揭秘》UI事件汇总
继续Android开发的征程。以下是Android应用开发揭秘这本书第四章的关于UI的事件处理的总结。基本上都是可以复用的代码。存着日后方便。
1.EditView控件的setOnKeyListener方法。点击上下左右键或者中间键的时候可以出发该方法。代码如下。
- myEditView.setOnKeyListener(new EditText.OnKeyListener(){
- @Override
- public boolean onKey(View v, int keyCode, KeyEvent event) {
- myTextView.setText("文本框中内容是:"+myEditView.getText().toString());
- return false;// TODO Auto-generated method stub
- }
- });
- myEditView.setOnKeyListener(new EditText.OnKeyListener(){
- @Override
- public boolean onKey(View v, int keyCode, KeyEvent event) {
- myTextView.setText("文本框中内容是:"+myEditView.getText().toString());
- return false;// TODO Auto-generated method stub
- }
- });
2.RadioButton控件和RadioGroup控件的组合使用,代码如下:
- myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
- @Override
- public void onCheckedChanged(RadioGroup group, int checkedId) {
- // TODO Auto-generated method stub
- if(checkedId == myRadioButton3.getId())
- {
- DisplayToast("正确答案:"+myRadioButton3.getText()+"恭喜你回答正确");
- }
- else
- {
- DisplayToast("回答错误");
- }
- }
- );
- myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
- @Override
- public void onCheckedChanged(RadioGroup group, int checkedId) {
- // TODO Auto-generated method stub
- if(checkedId == myRadioButton3.getId())
- {
- DisplayToast("正确答案:"+myRadioButton3.getText()+"恭喜你回答正确");
- }
- else
- {
- DisplayToast("回答错误");
- }
- }
- );
3.CheckBox控件的使用,代码如下:
- myCheckBox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){
- @Override
- public void onCheckedChanged(CompoundButton buttonView,
- boolean isChecked) {
- // TODO Auto-generated method stub
- if(myCheckBox1.isChecked()){
- DisplayToast("你选择了:"+myCheckBox1.getText());
- }
- }
- });
- myCheckBox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){
- @Override
- public void onCheckedChanged(CompoundButton buttonView,
- boolean isChecked) {
- // TODO Auto-generated method stub
- if(myCheckBox1.isChecked()){
- DisplayToast("你选择了:"+myCheckBox1.getText());
- }
- }
- });
4.Button控件的使用,代码如下:
- myButton1.setOnClickListener(new Button.OnClickListener(){
- @Override
- public void onClick(View v) {
- }
- });
- myButton1.setOnClickListener(new Button.OnClickListener(){
- @Override
- public void onClick(View v) {
- }
- });
4.Spinner控件的使用,代码如下:
- //Spinner控件需要跟ArrayAdapter绑定使用。
- private static final String[] m_Countries = {"A型","B型","O型","AB型","未知类型"};
- private Spinner mySpinner;
- private ArrayAdapter<String> myAdapter;
- mySpinner = (Spinner)findViewById(R.id.mySpinner1);
- myAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m_Countries);
- //设置下拉列表风格
- myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
- //将adapter添加到mySpinner中
- mySpinner.setAdapter(myAdapter);
- //添加事件监听
- mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
- @Override
- public void onItemSelected(AdapterView<?> arg0, View arg1,
- int arg2, long arg3) {
- // TODO Auto-generated method stub
- myTextView.setText("你的血型是"+ m_Countries[arg2]);
- arg0.setVisibility(View.VISIBLE);
- }
- @Override
- public void onNothingSelected(AdapterView<?> arg0) {
- // TODO Auto-generated method stub
- DisplayToast("你什么也没选!");
- }
- });
- //Spinner控件需要跟ArrayAdapter绑定使用。
- private static final String[] m_Countries = {"A型","B型","O型","AB型","未知类型"};
- private Spinner mySpinner;
- private ArrayAdapter<String> myAdapter;
- mySpinner = (Spinner)findViewById(R.id.mySpinner1);
- myAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m_Countries);
- //设置下拉列表风格
- myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
- //将adapter添加到mySpinner中
- mySpinner.setAdapter(myAdapter);
- //添加事件监听
- mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
- @Override
- public void onItemSelected(AdapterView<?> arg0, View arg1,
- int arg2, long arg3) {
- // TODO Auto-generated method stub
- myTextView.setText("你的血型是"+ m_Countries[arg2]);
- arg0.setVisibility(View.VISIBLE);
- }
- @Override
- public void onNothingSelected(AdapterView<?> arg0) {
- // TODO Auto-generated method stub
- DisplayToast("你什么也没选!");
- }
- });
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