四、监听日期与时间的改变
main.xml：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <EditText android:id="@+id/input" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <DatePicker android:id="@+id/date" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <TimePicker android:id="@+id/time" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout></LinearLayout>
?
Activity:
package com.iflytek.activity;import android.app.Activity;import android.os.Bundle;import android.widget.DatePicker;import android.widget.DatePicker.OnDateChangedListener;import android.widget.EditText;import android.widget.TimePicker;import android.widget.TimePicker.OnTimeChangedListener;public class EventActivity extends Activity { private EditText input = null; private DatePicker date = null; private TimePicker time = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setContentView(R.layout.main); input = (EditText) super.findViewById(R.id.input); date = (DatePicker) super.findViewById(R.id.date); time = (TimePicker) super.findViewById(R.id.time); // 设置24小时制显示时间 this.time.setIs24HourView(true); // 时间监听 this.time.setOnTimeChangedListener(new OnTimeChangedListenerImpl()); // 日期监听器，注意这里的日期监听方式和以前有所区别 this.date.init(this.date.getYear(), this.date.getMonth(), this.date.getDayOfMonth(), new OnDateChangedListenerImpl()); this.setDateTime(); } private class OnTimeChangedListenerImpl implements OnTimeChangedListener { @Override public void onTimeChanged(TimePicker view, int hourOfDay, int minute) { EventActivity.this.setDateTime(); } } private class OnDateChangedListenerImpl implements OnDateChangedListener { @Override public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) { EventActivity.this.setDateTime(); } } public void setDateTime() { //注意这里的月份是从0开始的 this.input.setText(this.date.getYear() + "-" + (this.date.getMonth()+1) + "-" + this.date.getDayOfMonth() + " " + this.time.getCurrentHour() + ":" + this.time.getCurrentMinute()); }}?五、焦点事件
验证输入Demo
main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <EditText android:id="@+id/edit" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="请输入查询内容"/> <EditText android:id="@+id/msg" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="xdwang"/> <TextView android:id="@+id/txt" android:layout_width="fill_parent" android:layout_height="wrap_content"/></LinearLayout>
?
Activity:
package com.iflytek.activity;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.widget.EditText;import android.widget.TextView;public class EventActivity extends Activity { private EditText edit = null; private TextView txt = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setContentView(R.layout.main); this.edit = (EditText) super.findViewById(R.id.edit); this.txt = (TextView) super.findViewById(R.id.txt); this.edit.setOnClickListener(new OnClickListenerImpl()); this.edit.setOnFocusChangeListener(new OnFocusChangeListenerImpl()); } private class OnClickListenerImpl implements OnClickListener { @Override public void onClick(View v) { EventActivity.this.edit.setText("");// 清空文本 } } private class OnFocusChangeListenerImpl implements OnFocusChangeListener { @Override public void onFocusChange(View view, boolean hasFocus) { // view表示操作的组件，hasFocus表示是否获得焦点 if (hasFocus) {// 已经获得了焦点 EventActivity.this.txt.setText("获得了焦点"); } else { if (EventActivity.this.edit.getText().length() > 0) {// 现在有数据 EventActivity.this.txt.setText("文本输入组件失去焦点，输入内容合法"); } else { EventActivity.this.txt.setText("文本输入组件失去焦点，输入内容不能为空！"); } } } }}?
六、长按事件
设置桌面Demo
Main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/info" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="长按图片将设置为桌面背景" /> <ImageView android:id="@+id/img" android:layout_width="fill_parent" android:layout_height="fill_parent" android:src="@drawable/james_java"/> </LinearLayout>?
AndroidManifest.xml加上：
<!-- 允许设置桌面 --> <uses-permission android:name="android.permission.SET_WALLPAPER" />?
Activity：
package com.iflytek.activity;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnLongClickListener;import android.widget.ImageView;import android.widget.TextView;public class EventActivity extends Activity { private TextView info = null; private ImageView img = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setContentView(R.layout.main); this.img = (ImageView) super.findViewById(R.id.img); this.info = (TextView) super.findViewById(R.id.info); this.img.setOnLongClickListener(new OnLongClickListenerImpl()); } private class OnLongClickListenerImpl implements OnLongClickListener { @Override public boolean onLongClick(View v) { try { EventActivity.this.clearWallpaper();// 清除已有的桌面 EventActivity.this.setWallpaper(EventActivity.this.img .getResources().openRawResource(R.drawable.james_java));// 设置桌面 EventActivity.this.info.setText("桌面背景已修改."); } catch (Exception e) { e.printStackTrace() ; EventActivity.this.info.setText("桌面背景修改失败！"); } return false; } }}?
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