android初學之自定義控件實用

自定義控件layout.xml:

<?xml version="1.0" encoding="utf-8"?>
	<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
		android:layout_width="match_parent"
		android:layout_height="70dip"
		android:orientation="vertical" >

		<TextView
			android:id="@+id/tv_settingview_title"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_marginLeft="3dip"
			android:layout_marginTop="3dip"
			android:text="標題"
			android:textColor="@color/black"
			android:textSize="28sp" />

		<TextView
			android:id="@+id/tv_settingview_content"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_below="@id/tv_settingview_title"
			android:layout_marginLeft="3dip"
			android:layout_marginTop="2dip"
			android:text="描述信息"
			android:textColor="#99000000"
			android:textSize="18sp" />

		<CheckBox
			android:clickable="false"		//不能被點擊
			android:focusable="false"		//不能獲取焦點
			android:id="@+id/cb_settingview"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_alignParentRight="true"
			android:layout_centerVertical="true" />

		<View
			android:layout_alignParentBottom="true"
			android:layout_width="fill_parent"
			android:background="@drawable/list_devider"
			android:layout_height="1dip" >
		</View>

	</RelativeLayout>

 

自定義控件類：

public class SettingView extends RelativeLayout {

		private View view;
		private TextView tv_setting_1;
		private TextView tv_setting_2;
		private CheckBox cb_setting;
		
		public SettingView(Context context, AttributeSet attrs, int defStyle) {
			super(context, attrs, defStyle);
			initView(context);
		}

		public SettingView(Context context, AttributeSet attrs) {
			super(context, attrs);
			initView(context);
			//把屬性集和咱們定義的屬性數組創建對應關係
			TypedArray a =	context.obtainStyledAttributes(attrs, R.styleable.my_setting_view);
			String content = a.getString(R.styleable.my_setting_view_content);
			String title = a.getString(R.styleable.my_setting_view_title);
			tv_setting_1.setText(title);
			tv_setting_2.setText(content);
			a.recycle();
		}

		public SettingView(Context context) {
			super(context);
			initView(context);
		}
		
		private void initView(Context context){
			//把xml文件轉化成對象，this：view對象以本身爲父體
			view = View.inflate(context, R.layout.view_setting, this);
			tv_setting_1 = (TextView) view.findViewById(R.id.tv_setting_1);
			tv_setting_2 = (TextView) view.findViewById(R.id.tv_setting_2);
			cb_setting = (CheckBox) view.findViewById(R.id.cb_setting);
		}
		/**
		 * 判斷是否被選中
		 * @return
		 */
		public boolean isCkecked(){
			return cb_setting.isChecked();
		}
		
		/**
		 * 設置當前控件的選中狀態
		 * @param checked
		 * @return
		 */
		public void setChecked(boolean checked){
			cb_setting.setChecked(checked);
		}
		
		/**
		 * 更改content裏面的內容
		 * 
		 */
		public void setContent(String text, int color){
			tv_setting_2.setText(text);
			tv_setting_2.setTextColor(color);
		}
		
	}

 

value目錄下的attrs.xml：

<?xml version="1.0" encoding="utf-8"?>
	<resources>
		<declare-styleable name="my_setting_view">
			<attr name="title" format="string" />
			<attr name="content" format="string" />
		</declare-styleable>
	</resources>

 

用到自定義控件的Activity的layout.xml中: 

<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
		xmlns:itcast="http://schemas.android.com/apk/res/com.example.myapplication"		//自定義控件的名稱空間
		android:layout_width="match_parent"
		android:layout_height="match_parent"
		android:orientation="vertical" >

		<LinearLayout
			android:id="@+id/rl_set"
			android:layout_width="fill_parent"
			android:layout_height="wrap_content"
			android:background="@color/lightskyblue"
			android:orientation="horizontal" >

			<TextView
				android:layout_width="match_parent"
				android:layout_height="wrap_content"
				android:gravity="center"
				android:text="我的設置"
				android:textSize="25sp" />
		</LinearLayout>

		<com.example.myapplication.SettingView
			itcast:title = "自動更新"
			itcast:content = "自動更新已經開啓"
			android:id="@+id/sv_setting"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content" />

	</LinearLayout>

 

用到自定義控件的Activity：

public class SettingActivity extends Activity {

		private SettingView sv_setting;
		private SharedPreferences sp;

		protected void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);
			setContentView(R.layout.activity_setting);

			sp = getSharedPreferences("config", MODE_PRIVATE);

			sv_setting = (SettingView) findViewById(R.id.sv_setting);

			boolean update = sp.getBoolean("update", true);
			if(update){
				sv_setting.setChecked(true);
				sv_setting.setContent("自動更新已經開啓", Color.BLACK);
			}else{
				sv_setting.setChecked(false);
				sv_setting.setContent("自動更新沒有開啓", Color.RED);
			}
			sv_setting.setOnClickListener(new OnClickListener() {

				public void onClick(View v) {
					Editor editor = sp.edit();

					if (sv_setting.isCkecked()) {
						sv_setting.setChecked(false);
						sv_setting.setContent("自動更新沒有開啓", Color.RED);
						editor.putBoolean("update", false);
					} else {
						sv_setting.setChecked(true);
						sv_setting.setContent("自動更新已經開啓", Color.BLACK);
						editor.putBoolean("update", true);
					}
					editor.commit();
				}
			});

		}
	}