Android开发从入门到精通(8) _5
按钮 第八章(5)
看看下面的代码。这段代码代表了四个文件，AndroidManifest.xml, Button.xml, testButton.java, 和 AndroidViews.java。增加代码到现存的AndroidViews活动中。
警告
如果你没有一开始就跟从本章，你执行代码时可能会遇到麻烦。要确保得到完整的项目，请从本章的开始开始阅读。
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifestxmlns:android=http://schemas.android.com/apk/res/android package="android_programmers_guide.AndroidViews" <applicationandroid:icon="@drawable/icon"> <activityandroid:name=".AndroidViews" android:label="@string/app_name"> <intent-filter> <actionandroid:name="android.intent.action.MAIN"/> <categoryandroid:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <activityandroid:name=".AutoComplete"android:label="AutoComplete"> <intent-filter> <actionandroid:name="android.intent.action.MAIN"/> <categoryandroid:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <activityandroid:name=".testButton"android:label="TestButton"> <intent-filter> <actionandroid:name="android.intent.action.MAIN"/> <categoryandroid:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> </application> </manifest> |
Button.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayoutxmlns:android=http://schemas.android.com/apk/res/android android:orientation="vertical" android:layout_width="fill_parent" Chapter8:Lists,Menus,andOtherViews173 android:layout_height="fill_parent"> <Buttonandroid:id="@+id/testButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="ThisisthetestButton"/> <Buttonandroid:id="@+id/layoutButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="ChangeLayout"/> <Buttonandroid:id="@+id/textColorButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="ChangeTextColor"/> </LinearLayout> |
testButton.java
package android_programmers_guide.AndroidViews; importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.View; importandroid.widget.Button; importandroid.graphics.Color; publicclasstestButtonextendsActivity{ @Override publicvoidonCreate(Bundleicicle){ super.onCreate(icicle); setContentView(R.layout.Button); finalButtonButton=(Button)findViewById(R.id.testButton); finalButtonchangeButton=(Button)findViewById(R.id.layoutButton); changeButton.setOnClickListener(newButton.OnClickListener(){ publicvoidonClick(Viewv){ changeOption(Button);} }); finalButtonchangeButton2=(Button) findViewById(R.id.textColorButton); changeButton2.setOnClickListener(newButton.OnClickListener(){ publicvoidonClick(Viewv){ changeOption2(Button); } }); } publicvoidchangeOption(ButtonButton){ if(Button.getHeight()==100){ Button.setHeight(30); } 174Android:AProgrammer’sGuide Chapter8:Lists,Menus,andOtherViews175 else{ Button.setHeight(100); } } publicvoidchangeOption2(ButtonButton){ Button.setTextColor(Color.RED); } } |
AndroidViews.java
package android_programmers_guide.AndroidViews; importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.Menu; importandroid.content.Intent; publicclassAndroidViewsextendsActivity{ /**CalledwhentheActivityisfirstcreated.*/ @Override publicvoidonCreate(Bundleicicle){ super.onCreate(icicle); setContentView(R.layout.main); } @Override publicbooleanonCreateOptionsMenu(Menumenu){ super.onCreateOptionsMenu(menu); menu.add(0,0,"AutoComplete"); menu.add(0,1,"Button"); menu.add(0,2,"CheckBox"); menu.add(0,3,"EditText"); menu.add(0,4,"RadioGroup"); menu.add(0,5,"Spinner"); returntrue; } @Override publicbooleanonOptionsItemSelected(Menu.Itemitem){ switch(item.getId()){ case0: showAutoComplete(); returntrue; case1: showButton(); returntrue; case2: returntrue; case3: returntrue; case4: returntrue; case5: returntrue; } returntrue; } publicvoidshowButton(){ IntentshowButton=newIntent(this,testButton.class); startActivity(showButton); } publicvoidshowAutoComplete(){ Intentautocomplete=newIntent(this,AutoComplete.class); startActivity(autocomplete); } } |
启动你的应用程序并且选择从菜单上选择按钮选项。试着点击Change Layout按钮。再一次，对文本来说，结果是一个较宽的显示区域，点击改变Text Color按钮并且文本变成红色。