Android学习07-----事件处理(1)单击事件_改变屏幕方向和密码明文显示
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<?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" > <Button android:id="@+id/btn_change" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="改变屏幕方向为横屏显示（当前为竖屏显示）"/></LinearLayout>
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package com.iflytek.activity;import android.app.Activity;import android.content.pm.ActivityInfo;import android.content.res.Configuration;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class EventActivity extends Activity {private Button btnChange = null;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// setContentView(R.layout.main);// 1、单击事件处理Demosuper.setContentView(R.layout.onclick);this.btnChange = (Button) super.findViewById(R.id.btn_change);this.btnChange.setOnClickListener(new MyOnClickLlistenerImpl());}private class MyOnClickLlistenerImpl implements OnClickListener {@Overridepublic void onClick(View v) {int screen_dir = EventActivity.this.getRequestedOrientation();// 获取当前屏幕方向，0表示横屏，1表示竖屏if (screen_dir == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) {// 无法进行画面旋转EventActivity.this.btnChange.setText("错误：无法改变屏幕的方向");} else {if (screen_dir == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {// 现在方向是横屏EventActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);// 变成竖屏} else if (screen_dir == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {EventActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);}}}}/** * 表示的时系统设置修改的时候触发 */@Overridepublic void onConfigurationChanged(Configuration newConfig) {//找到当前屏幕方向的一个标记性的常量，通过这个常量把值返回去int screen_dir = newConfig.orientation;//注意这里不要再使用ActivityInfo.SCREEN_ORIENTATION_PORTRAIT了，因为有时这两个值是不一样的if (screen_dir == Configuration.ORIENTATION_LANDSCAPE) {EventActivity.this.btnChange.setText("改变屏幕方向为竖屏显示（当前为横屏显示）");}else if(screen_dir == Configuration.ORIENTATION_PORTRAIT){EventActivity.this.btnChange.setText("改变屏幕方向为横屏显示（当前为竖屏显示）");}super.onConfigurationChanged(newConfig);}}
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<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.iflytek.activity" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:label="@string/app_name" android:name=".EventActivity" android:screenOrientation="portrait" android:configChanges="orientation|keyboard" > <!-- android:screenOrientation设置开始按竖屏显示，这里不设置，也改变不了 --> <!-- android:configChanges配置configChanges事件 --> <intent-filter > <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <!-- 设置允许改变配置信息的权限 --> <uses-permission android:name="android.permission.CHANGE_CONFIGURATION"/></manifest>
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<?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/msg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="请输入密码" /> <EditText android:id="@+id/password" android:layout_width="fill_parent" android:layout_height="wrap_content" android:password="true"/> <CheckBox android:id="@+id/show" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="false" android:text="显示密码"/> </LinearLayout>
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Activity：
package com.iflytek.activity;import android.app.Activity;import android.os.Bundle;import android.text.method.HideReturnsTransformationMethod;import android.text.method.PasswordTransformationMethod;import android.view.View;import android.view.View.OnClickListener;import android.widget.CheckBox;import android.widget.EditText;public class EventActivity extends Activity {private EditText password = null;private CheckBox show = null;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);this.password = (EditText) super.findViewById(R.id.password);this.show = (CheckBox) super.findViewById(R.id.show);this.show.setOnClickListener(new OnClickListenerImpl());}private class OnClickListenerImpl implements OnClickListener {@Overridepublic void onClick(View v) {if (EventActivity.this.show.isChecked()) {// 被选中，则显示明文// 将文本框的内容设置成明文显示EventActivity.this.password.setTransformationMethod(HideReturnsTransformationMethod.getInstance());} else {// 将文本框内容设置成密文的方式显示EventActivity.this.password.setTransformationMethod(PasswordTransformationMethod.getInstance());}}}}?
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