枚举类型应用小Demo

package com.phicomm.hu.eagt; import android.app.Activity; import android.gesture.Gesture; import android.gesture.GestureOverlayView; import android.gesture.GestureOverlayView.OnGestureListener; import android.gesture.GestureOverlayView.OnGesturePerformedListener; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class EnumAndGestureTest extends Activity implements OnGestureListener { private GestureOverlayView mGestureOverlayView; private Button mLeftButton, mRightButton; private TextView mHeaderMsg; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //设置ActionBar标题 getActionBar().setTitle(R.string.draw_gesture); //获取相关组件对象 mGestureOverlayView = (GestureOverlayView) findViewById(R.id.gesture); mLeftButton = (Button)findViewById(R.id.left); mRightButton = (Button)findViewById(R.id.right); mHeaderMsg = (TextView)findViewById(R.id.header); //注册手势相关监听器 mGestureOverlayView.addOnGestureListener(this); //mGestureOverlayView.addOnGesturePerformedListener(this); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); //程序创建时的绘制标题状态和按钮状态 setButtunStatus(Stage.Introduction); monitorChange(Stage.Introduction); } // 定义左边按钮各状态的枚举，注：构造函数和成员变量的位置都要放在后面 private enum LeftButtonMode { // 按钮显示为取消、可点击状态的枚举对象(枚举对象意味个人说法) Cancel(R.string.cancel, true), // 按钮显示为取消、不可点击状态 CancelDisabled(R.string.cancel, false), // 按钮显示为重试、可点击状态 Retry(R.string.retry, true), // 按钮显示为重试、不可点击状态 RetryDisabled(R.string.retry, false); LeftButtonMode(int text, boolean enabled) { this.text = text; this.enabled = enabled; } final int text; final boolean enabled; } // 定义右边按钮各状态的枚举 private enum RightButtonMode { Continue(R.string.next, true), ContinueDisabled(R.string.next, false), Confirm(R.string.confirm, true), ConfirmDisabled(R.string.confirm,false); RightButtonMode(int text, boolean enabled) { this.text = text; this.enabled = enabled; } final int text; final boolean enabled; } //统筹左右按钮状态的枚举，可以理解为枚举的复用(将左右按钮的状态枚举作为实参传递) private enum Stage { Introduction(R.string.gesture_introdution, LeftButtonMode.Cancel, RightButtonMode.Confirm), Ready( R.string.gesture_ready, LeftButtonMode.CancelDisabled, RightButtonMode.ConfirmDisabled), Gesturing( R.string.gesture_drawing, LeftButtonMode.RetryDisabled, RightButtonMode.ContinueDisabled), Finish( R.string.gesture_finish, LeftButtonMode.Retry, RightButtonMode.Continue); Stage(int headerMessage, LeftButtonMode leftMode, RightButtonMode rightMode) { this.headerMessage = headerMessage; this.leftMode = leftMode; this.rightMode = rightMode; } final int headerMessage; final LeftButtonMode leftMode; final RightButtonMode rightMode; } //该方法的定义重点在于说明枚举类型能在switch语句中的活用(比如，我们可以根据传递的枚举进行监听操作某些事件) private void monitorChange(Stage stage) { switch (stage) { case Introduction: Toast.makeText(this, "App onResume", Toast.LENGTH_SHORT).show(); break; case Ready: Toast.makeText(this, "onGestureStarted", Toast.LENGTH_SHORT).show(); break; case Gesturing: Toast.makeText(this, "onGesture", Toast.LENGTH_SHORT).show(); break; case Finish: Toast.makeText(this, "onGestureEnded", Toast.LENGTH_SHORT).show(); break; } } //根据传进来的枚举Stage设置和显示按钮的状态 private void setButtunStatus(Stage stage) { mHeaderMsg.setText(stage.headerMessage); mLeftButton.setText(stage.leftMode.text); mLeftButton.setEnabled(stage.leftMode.enabled); mRightButton.setText(stage.rightMode.text); mRightButton.setEnabled(stage.rightMode.enabled); } // 正在画手势时调用该函数 @Override public void onGesture(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub //在画手势的过程中，更新按钮的状态 setButtunStatus(Stage.Gesturing); monitorChange(Stage.Gesturing); } @Override public void onGestureCancelled(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub } // 画完手势时调用 @Override public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub //画完手势更新按钮状态 setButtunStatus(Stage.Finish); monitorChange(Stage.Finish); } // 开始画手势时调用（即用户手指点住屏幕还没开始滑动时调用） @Override public void onGestureStarted(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub //准备画手势时更新按钮状态 setButtunStatus(Stage.Ready); monitorChange(Stage.Ready); } }