下面是各种常用控件的事件监听的使用
①EditText(编辑框)的事件监听---OnKeyListener
②RadioGroup、RadioButton(单选按钮)的事件监听---OnCheckedChangeListener
③CheckBox(多选按钮)的事件监听---OnCheckedChangeListener
④Spinner(下拉列表)的事件监听---OnItemSelectedListener
⑤Menu(菜单)的事件处理---onMenuItemSelected
⑥Dialog(对话框)的事件监听---DialogInterface.OnClickListener()
至于Button的事件监听,可以在上一篇博客中看到。
第一个例子:EditText的事件监听
package org.hualang.eventtest2;
import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class EventTest2 extends Activity {
/** Called when the activity is first created. */
private TextView mytext;
private EditText edittext;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mytext = (TextView)findViewById(R.id.mytext);
edittext = (EditText)findViewById(R.id.edittext);
/**
* 设置当EditText为空,则提示“请输入账号”
* 在配置文件main.xml中可以用android:hint="请输入账号"来实现
*/
edittext.setHint("请输入账号");
//下面为EditText事件监听
edittext.setOnKeyListener(new EditText.OnKeyListener()
{
@Override
public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
//得到文字,显示在TextView中
mytext.setText("内容:"+edittext.getText().toString());
return false;
}
});
}
}
main.xml
第二个例子:单选按钮的事件监听处理
class=java name="code">"1.0" encoding="utf-8"?>
class=java name="code">package org.hualang.eventtest6;
"FONT-SIZE: 18px">
"FONT-SIZE: 18px">
package org.hualang.eventtest; import android.app.Activity; import android.os.Bundle; import android.view.Gravity; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.Toast; public class EventTest3 extends Activity { /** Called when the activity is first created. */ private RadioGroup group; private RadioButton radio1,radio2,radio3,radio4; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); group = (RadioGroup)findViewById(R.id.radiogroup1); radio1 = (RadioButton)findViewById(R.id.button1); radio2 = (RadioButton)findViewById(R.id.button2); radio3 = (RadioButton)findViewById(R.id.button3); radio4 = (RadioButton)findViewById(R.id.button4); group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { // TODO Auto-generated method stub if (checkedId == radio2.getId()) { showMessage("正确答案:" + radio2.getText()+",恭喜你,答对了"); } else { showMessage("对不起,虽然很多,但不是公认的最多"); } } }); } public void showMessage(String str) { Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT); toast.setGravity(Gravity.TOP, 0, 220); toast.show(); } } main.xml
- "1.0" encoding="utf-8"?>
"http://schemas.android.com/apk/res/android" - android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- android:id="@+id/mytextview"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="哪个城市的美女最多?"
- />
- android:id="@+id/radiogroup1"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:orientation="vertical"
- >
- android:id="@+id/button1"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="杭州"
- />
- android:id="@+id/button2"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="重庆"
- />
- android:id="@+id/button3"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="成都"
- />
- android:id="@+id/button4"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="香港"
- />
- "COLOR: #ff0000">第三个例子:复选框的事件处理
- package org.hualang.eventtest4;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.Gravity;
- import android.view.View;
- import android.widget.Button;
- import android.widget.CheckBox;
- import android.widget.CompoundButton;
- import android.widget.CompoundButton.OnCheckedChangeListener;
- import android.widget.Toast;
- public class EventTest4 extends Activity {
- /** Called when the activity is first created. */
- private CheckBox ch1,ch2,ch3,ch4,ch5;
- private Button mybutton;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- mybutton = (Button)findViewById(R.id.mybutton);
- ch1 = (CheckBox)findViewById(R.id.check1);
- ch2 = (CheckBox)findViewById(R.id.check2);
- ch3 = (CheckBox)findViewById(R.id.check3);
- ch4 = (CheckBox)findViewById(R.id.check4);
- ch5 = (CheckBox)findViewById(R.id.check5);
- ch1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()
- {
- @Override
- public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
- // TODO Auto-generated method stub
- if(ch1.isChecked())
- {
- showMessage("你选择了"+ch1.getText());
- }
- }
- });
- ch2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()
- {
- @Override
- public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
- // TODO Auto-generated method stub
- if(ch3.isChecked())
- {
- showMessage("你选择了"+ch2.getText());
- }
- }
- });
- ch3.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()
- {
- @Override
- public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
- // TODO Auto-generated method stub
- if(ch3.isChecked())
- {
- showMessage("你选择了"+ch3.getText());
- }
- }
- });
- ch4.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()
- {
- @Override
- public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
- // TODO Auto-generated method stub
- if(ch4.isChecked())
- {
- showMessage("你选择了"+ch4.getText());
- }
- }
- });
- ch5.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()
- {
- @Override
- public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
- // TODO Auto-generated method stub
- if(ch5.isChecked())
- {
- showMessage("你选择了"+ch5.getText());
- }
- }
- });
- mybutton.setOnClickListener(new Button.OnClickListener()
- {
- @Override
- public void onClick(View arg0) {
- // TODO Auto-generated method stub
- int num = 0;
- if(ch1.isChecked())
- {
- num++;
- }
- if(ch2.isChecked())
- {
- num++;
- }
- if(ch3.isChecked())
- {
- num++;
- }
- if(ch4.isChecked())
- {
- num++;
- }
- if(ch5.isChecked())
- {
- num++;
- }
- showMessage("谢谢参与,您一共选择了"+num+"项");
- }
- });
- }
- public void showMessage(String str)
- {
- Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT);
- toast.setGravity(Gravity.TOP, 0, 220);
- toast.show();
- }
- }
- "FONT-SIZE: 24px; COLOR: #ff0000">main.xml
- "1.0" encoding="utf-8"?>
"http://schemas.android.com/apk/res/android" - android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="你喜欢哪些智能手机系统"
- />
- android:id="@+id/check1"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="苹果 ios"
- />
- android:id="@+id/check2"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="谷歌 Android"
- />
- android:id="@+id/check3"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="RIM BlackBerry"
- />
- android:id="@+id/check4"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="微软 Windows phone 7"
- />
- android:id="@+id/check5"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="诺基亚 symbian"
- />
- android:id="@+id/mybutton"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="确定"
- />
- "COLOR: #ff0000">第四个例子:Spinner下拉菜单的事件处理
- package org.hualang.eventtest5;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.AdapterView;
- import android.widget.ArrayAdapter;
- import android.widget.Spinner;
- import android.widget.TextView;
- public class EventTest5 extends Activity {
- /** Called when the activity is first created. */
- private static final String[] citys={"杭州","北京","成都","大连","深圳","南京"};
- private TextView text;
- private Spinner spinner;
- private ArrayAdapter
adapter; - @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- text=(TextView)findViewById(R.id.text);
- spinner=(Spinner)findViewById(R.id.spinner);
- //将可选内容与ArrayAdapter连接
- adapter=new ArrayAdapter
( this,android.R.layout.simple_spinner_item,citys);- //设置下拉列表风格
- adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
- //将adapter添加到spinner中
- spinner.setAdapter(adapter);
- //添加Spinner事件监听
- spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener()
- {
- @Override
- public void onItemSelected(AdapterView> arg0, View arg1,
- int arg2, long arg3) {
- // TODO Auto-generated method stub
- text.setText("你所在的城市是:"+citys[arg2]);
- //设置显示当前选择的项
- arg0.setVisibility(View.VISIBLE);
- }
- @Override
- public void onNothingSelected(AdapterView> arg0) {
- // TODO Auto-generated method stub
- }
- });
- }
- }
- "FONT-SIZE: 24px; COLOR: #ff0000">main.xml
- "1.0" encoding="utf-8"?>
"http://schemas.android.com/apk/res/android" - android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- android:id="@+id/text"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="您所在的城市"
- />
- android:id="@+id/spinner"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_centerHorizontal="true"
- />
- "COLOR: #ff0000">第五个例子:Menu(菜单)的事件处理
第三个例子:复选框的事件处理 package org.hualang.eventtest4; import android.app.Activity; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.Toast; public class EventTest4 extends Activity { /** Called when the activity is first created. */ private CheckBox ch1,ch2,ch3,ch4,ch5; private Button mybutton; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mybutton = (Button)findViewById(R.id.mybutton); ch1 = (CheckBox)findViewById(R.id.check1); ch2 = (CheckBox)findViewById(R.id.check2); ch3 = (CheckBox)findViewById(R.id.check3); ch4 = (CheckBox)findViewById(R.id.check4); ch5 = (CheckBox)findViewById(R.id.check5); ch1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton arg0, boolean arg1) { // TODO Auto-generated method stub if(ch1.isChecked()) { showMessage("你选择了"+ch1.getText()); } } }); ch2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton arg0, boolean arg1) { // TODO Auto-generated method stub if(ch3.isChecked()) { showMessage("你选择了"+ch2.getText()); } } }); ch3.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton arg0, boolean arg1) { // TODO Auto-generated method stub if(ch3.isChecked()) { showMessage("你选择了"+ch3.getText()); } } }); ch4.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton arg0, boolean arg1) { // TODO Auto-generated method stub if(ch4.isChecked()) { showMessage("你选择了"+ch4.getText()); } } }); ch5.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton arg0, boolean arg1) { // TODO Auto-generated method stub if(ch5.isChecked()) { showMessage("你选择了"+ch5.getText()); } } }); mybutton.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub int num = 0; if(ch1.isChecked()) { num++; } if(ch2.isChecked()) { num++; } if(ch3.isChecked()) { num++; } if(ch4.isChecked()) { num++; } if(ch5.isChecked()) { num++; } showMessage("谢谢参与,您一共选择了"+num+"项"); } }); } public void showMessage(String str) { Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT); toast.setGravity(Gravity.TOP, 0, 220); toast.show(); } } main.xml 第四个例子:Spinner下拉菜单的事件处理 package org.hualang.eventtest5; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; public class EventTest5 extends Activity { /** Called when the activity is first created. */ private static final String[] citys={"杭州","北京","成都","大连","深圳","南京"}; private TextView text; private Spinner spinner; private ArrayAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); text=(TextView)findViewById(R.id.text); spinner=(Spinner)findViewById(R.id.spinner); //将可选内容与ArrayAdapter连接 adapter=new ArrayAdapter (this,android.R.layout.simple_spinner_item,citys); //设置下拉列表风格 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //将adapter添加到spinner中 spinner.setAdapter(adapter); //添加Spinner事件监听 spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub text.setText("你所在的城市是:"+citys[arg2]); //设置显示当前选择的项 arg0.setVisibility(View.VISIBLE); } @Override public void onNothingSelected(AdapterView> arg0) { // TODO Auto-generated method stub } }); } } main.xml 第五个例子:Menu(菜单)的事件处理
- package org.hualang.eventtest6;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.Menu;
- import android.view.MenuInflater;
- import android.view.MenuItem;
- import android.widget.Toast;
- public class EventTest6 extends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- }
- @Override
- public boolean onCreateOptionsMenu(Menu menu) {
- // TODO Auto-generated method stub
- MenuInflater inflater = getMenuInflater();
- //设置menu界面为res/menu/menu.xml
- inflater.inflate(R.menu.menu, menu);
- return true;
- }
- @Override
- public boolean onMenuItemSelected(int featureId, MenuItem item) {
- //得到当前选中的MenuItem的ID
- int itemId = item.getItemId();
- switch(itemId)
- {
- case R.id.apple:
- Toast toast = Toast.makeText(this, "这是苹果", Toast.LENGTH_SHORT);
- toast.show();
- break;
- case R.id.banana:
- Toast toast2 = Toast.makeText(this, "这是香蕉", Toast.LENGTH_SHORT);
- toast2.show();
- break;
- case R.id.exit:
- EventTest6.this.finish();
- break;
- }
- return true;
- }
- }
package org.hualang.eventtest6; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.widget.Toast; public class EventTest6 extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub MenuInflater inflater = getMenuInflater(); //设置menu界面为res/menu/menu.xml inflater.inflate(R.menu.menu, menu); return true; } @Override public boolean onMenuItemSelected(int featureId, MenuItem item) { //得到当前选中的MenuItem的ID int itemId = item.getItemId(); switch(itemId) { case R.id.apple: Toast toast = Toast.makeText(this, "这是苹果", Toast.LENGTH_SHORT); toast.show(); break; case R.id.banana: Toast toast2 = Toast.makeText(this, "这是香蕉", Toast.LENGTH_SHORT); toast2.show(); break; case R.id.exit: EventTest6.this.finish(); break; } return true; } }
main.xml
第六个例子:对话框的事件处理
package org.hualang.dialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
ProgressDialog myDialog;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Dialog dialog = new AlertDialog.Builder(MainActivity.this)
.setTitle("登录提示")
.setMessage("这里需要登录")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
LayoutInflater factory = LayoutInflater.from(MainActivity.this);
final View DialogView = factory.inflate(R.layout.dialog, null);
AlertDialog dlg = new AlertDialog.Builder(MainActivity.this)
.setTitle("登录框")
.setView(DialogView)
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int whichButton) {
// TODO Auto-generated method stub
myDialog = ProgressDialog.show(MainActivity.this, "请等待...", "正在为你登录", true);
new Thread()
{
public void run()
{
try
{
sleep(3000);
}catch(Exception e)
{
e.printStackTrace();
}finally
{
myDialog.dismiss();
}
}
}.start();
}
}).setNegativeButton("取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
MainActivity.this.finish();
}
}).create();
dlg.show();
}
}).setNeutralButton("退出", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
MainActivity.this.finish();
}
}).create();
dialog.show();
}
}
xml文件
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:id="@+id/username"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:text="账号"
android:gravity="left"
android:textAppearance="?android:attr/textAppearanceMedium"
/>
android:id="@+id/myusername"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:scrollHorizontally="true"
android:autoText="false"
android:capitalize="none"
android:gravity="fill_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
/>
android:id="@+id/password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:text="密码"
android:gravity="left"
android:textAppearance="?android:attr/textAppearanceMedium"
/>
android:id="@+id/mypassword"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:scrollHorizontally="true"
android:autoText="false"
android:capitalize="none"
android:gravity="fill_horizontal"
android:password="true"
/>