Android学习笔记（一）之仿正点闹钟时间齿轮滑动的效果

看到正点闹钟上的设置时间的滑动效果非常好看，自己就想做一个那样的，在网上就开始搜资料了，看到网上有的齿轮效果的代码非常多，也非常难懂，我就决定自己研究一下，现在我就把我的研究成果分享给大家。我研究的这个效果出来了，而且代码也非常简单，通俗易懂。效果图如下：

首先是MainActivity的布局文件，这个布局文件非常简单，就是一个Button：activity_main.xml文件，代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ll_timeset"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffff"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="时间设置"
        android:textSize="24sp" />

</LinearLayout>

紧接着就是MainActivity的代码，代码如下：

package net.loonggg.test;

import net.loonggg.view.CustomerDateDialog;
import net.loonggg.view.CustomerDateDialog.DateDialogListener;
import android.app.Activity;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
	private int h, m;
	private CustomerDateDialog dialog;
	private Button btn;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		btn = (Button) findViewById(R.id.btn);
		btn.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				String datetime = DateFormat.format("kk:mm",
						System.currentTimeMillis()).toString();
				String[] strs = datetime.split(":");
				h = Integer.parseInt(strs[0]);
				m = Integer.parseInt(strs[1]);
				dialog = new CustomerDateDialog(MainActivity.this, h, m);
				dialog.show();
				dialog.setOnDateDialogListener(new DateDialogListener() {
					@Override
					public void getDate() {
						Toast.makeText(
								MainActivity.this,
								"时间是:" + dialog.getSettingHour() + "点"
										+ dialog.getSettingMinute() + "分",
								Toast.LENGTH_LONG).show();
					}
				});

			}
		});

	}

}

再就是我自定义了一个时钟的Dialog,自定义Dialog也非常简单，自己可以学一下，这方面网上的资料非常多。现在我把我自定义时钟的Dialog的代码分享一下，代码如下：

package net.loonggg.view;

import net.loonggg.test.R;
import android.annotation.SuppressLint;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;

@SuppressLint("HandlerLeak")
public class CustomerDateDialog extends Dialog {
	private View customView;
	private Button setBtn;
	private Button cancleBtn;
	private TextView arrow_up;
	private TextView tv01, tv02;
	private ScrollView sv01, sv02;
	private LinearLayout llTimeWheel;
	private DateDialogListener listener;
	private int lastY;
	private int flag;// 标记时分
	private int itemHeight;// 每一行的高度
	private int pHour, pMinute;// 初始化时显示的时分时间
	private int setHour, setMinute;

	public CustomerDateDialog(Context context, int hour, int minute) {
		super(context, R.style.CustomerDateDialog);
		customView = LayoutInflater.from(context).inflate(R.layout.time_wheel,
				null);
		init(context, hour, minute);
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.setContentView(customView);
	}

	private void init(Context context, final int hour, final int minute) {
		tv01 = (TextView) customView.findViewById(R.id.tv01);
		tv02 = (TextView) customView.findViewById(R.id.tv02);
		sv01 = (ScrollView) customView.findViewById(R.id.sv01);
		sv02 = (ScrollView) customView.findViewById(R.id.sv02);
		setBtn = (Button) customView.findViewById(R.id.setBtn);
		cancleBtn = (Button) customView.findViewById(R.id.cancleBtn);
		arrow_up = (TextView) customView.findViewById(R.id.arrow_up);
		this.pHour = hour;
		this.pMinute = minute;
		setHour = pHour;
		setMinute = pMinute;

		llTimeWheel = (LinearLayout) customView
				.findViewById(R.id.ll_time_wheel);
		setHourDial(tv01);
		setMinuteDial(tv02);

		sv01.setOnTouchListener(tListener);
		sv02.setOnTouchListener(tListener);

		final ViewTreeObserver observer = sv01.getViewTreeObserver();// observer
																		// 作用当视图完全加载进来的时候再取控件的高度，否则取得值是0
		observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

			@SuppressWarnings("deprecation")
			public void onGlobalLayout() {
				int tvHeight = tv02.getHeight();
				itemHeight = tvHeight / 180;
				if (sv01.getViewTreeObserver().isAlive()) {
					sv01.getViewTreeObserver().removeGlobalOnLayoutListener(
							this);
				}
				LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
						LinearLayout.LayoutParams.FILL_PARENT, (itemHeight * 3)
								+ arrow_up.getHeight() * 2);
				llTimeWheel.setLayoutParams(params);
				sv01.setLayoutParams(new LinearLayout.LayoutParams(tv02
						.getWidth(), (itemHeight * 3)));
				sv02.setLayoutParams(new LinearLayout.LayoutParams(tv02
						.getWidth(), (itemHeight * 3)));
				sv01.scrollTo(0, (pHour + 23) * itemHeight);
				sv02.scrollTo(0, (pMinute + 59) * itemHeight);

			}
		});

		setBtn.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				getSettingDate();
				CustomerDateDialog.this.cancel();
			}
		});

		cancleBtn.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				CustomerDateDialog.this.cancel();
			}
		});
	}

	private OnTouchListener tListener = new OnTouchListener() {

		public boolean onTouch(View v, MotionEvent event) {
			if (v == sv01) {
				flag = 1;
			} else {
				flag = 2;
			}
			if (event.getAction() == MotionEvent.ACTION_UP) {
				final ScrollView sv = (ScrollView) v;
				lastY = sv.getScrollY();
				System.out.println("lastY" + lastY);
				handler.sendMessageDelayed(handler.obtainMessage(0, v), 50);
			}
			return false;
		}
	};

	private Handler handler = new Handler() {
		@SuppressLint("HandlerLeak")
		public void handleMessage(android.os.Message msg) {
			ScrollView sv = (ScrollView) msg.obj;

			if (msg.what == 0) {
				if (lastY == sv.getScrollY()) {

					int num = lastY / itemHeight;
					int over = lastY % itemHeight;
					if (over > itemHeight / 2) {// 超过一半滚到下一格
						locationTo((num + 1) * itemHeight, sv, flag);
					} else {// 不到一半滚回上一格
						locationTo(num * itemHeight, sv, flag);
					}
				} else {
					lastY = sv.getScrollY();
					handler.sendMessageDelayed(handler.obtainMessage(0, sv), 50);// 滚动还没停止隔50毫秒再判断
				}
			}

		};
	};

	private void locationTo(int position, ScrollView scrollview, int flag) {
		switch (flag) {
		case 1:
			int mPosition = 0;
			if (position <= 23 * itemHeight) {
				mPosition = position + 24 * itemHeight;
				scrollview.scrollTo(0, mPosition);
			} else if (position >= 48 * itemHeight) {
				mPosition = position - 24 * itemHeight;
				scrollview.scrollTo(0, mPosition);
			} else {
				mPosition = position;
				scrollview.smoothScrollTo(0, position);
			}
			setHour = (mPosition / itemHeight - 23) % 24;
			break;

		case 2:
			int hPosition = 0;
			if (position <= 57 * itemHeight) {
				hPosition = position + 60 * itemHeight;
				scrollview.scrollTo(0, hPosition);
			} else if (position >= 120 * itemHeight) {
				hPosition = position - 60 * itemHeight;
				scrollview.scrollTo(0, hPosition);
			} else {
				hPosition = position;
				scrollview.smoothScrollTo(0, position);
			}
			setMinute = (hPosition / itemHeight) % 60 + 1;
			break;
		}

	}

	/**
	 * 设置分刻度盘
	 * 
	 * @param tv
	 */

	private void setMinuteDial(TextView tv) {
		StringBuffer buff = new StringBuffer();
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 60; j++) {
				if (j <= 9) {
					buff.append("0" + j);
				} else {
					buff.append(j + "");
				}
			}
		}

		tv.setText(buff);
	}

	/**
	 * 设置时刻度盘
	 * 
	 * @param tv
	 */
	private void setHourDial(TextView tv) {
		StringBuffer buff = new StringBuffer();
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 24; j++) {
				if (j <= 9) {
					buff.append("0" + j);
				} else {
					buff.append(j + "");
				}
			}

		}

		tv.setText(buff);
	}

	public void setpHour(int pHour) {
		this.pHour = pHour;
	}

	public void setpMinute(int pMinute) {
		this.pMinute = pMinute;
	}

	public void setOnDateDialogListener(DateDialogListener listener) {
		this.listener = listener;
	}

	public interface DateDialogListener {
		void getDate();
	}

	public void getSettingDate() {
		if (listener != null) {
			listener.getDate();
		}
	}

	public int getSettingHour() {
		return setHour;
	}

	public int getSettingMinute() {
		return setMinute;
	}

}

这里光有java代码还不够，还有自定义Dialog的布局文件，time_wheel.xml代码如下：

<?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="wrap_content"
    android:background="#efefef"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@color/light_black"
        android:paddingLeft="10dp"
        android:text="设置时间"
        android:textColor="@color/black"
        android:textSize="24sp" />

    <!-- 时间的相关设置 -->

    <LinearLayout
        android:id="@+id/ll_time_wheel"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:background="#f0f0f0"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TextView
                android:layout_width="30dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:background="@drawable/wheel_arrow_up" />

            <ScrollView
                android:id="@+id/sv01"
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:background="@drawable/time_bg"
                android:scrollbars="none" >

                <LinearLayout
                    android:id="@+id/ll01"
                    android:layout_width="50dp"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:orientation="horizontal"
                    android:paddingTop="5dp" >

                    <TextView
                        android:id="@+id/tv01"
                        android:layout_width="50dp"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:lineSpacingExtra="20dp"
                        android:paddingLeft="10dp"
                        android:paddingRight="10dp"
                        android:textSize="26sp" />
                </LinearLayout>
            </ScrollView>

            <TextView
                android:layout_width="30dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:background="@drawable/wheel_arrow_down" />
        </LinearLayout>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_gravity="center"
            android:background="#f0f0f0"
            android:gravity="center"
            android:text="时"
            android:textColor="#000000"
            android:textSize="25sp" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/arrow_up"
                android:layout_width="30dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:background="@drawable/wheel_arrow_up" />

            <ScrollView
                android:id="@+id/sv02"
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:background="@drawable/time_bg"
                android:scrollbars="none" >

                <LinearLayout
                    android:id="@+id/ll02"
                    android:layout_width="50dp"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:paddingTop="5dp" >

                    <TextView
                        android:id="@+id/tv02"
                        android:layout_width="50dp"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:lineSpacingExtra="20dp"
                        android:paddingLeft="10dp"
                        android:paddingRight="10dp"
                        android:textSize="26sp" />
                </LinearLayout>
            </ScrollView>

            <TextView
                android:id="@+id/arrow_down"
                android:layout_width="30dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:background="@drawable/wheel_arrow_down" />
        </LinearLayout>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_gravity="center"
            android:background="#f0f0f0"
            android:gravity="center"
            android:text="分"
            android:textColor="#000000"
            android:textSize="25sp" />
    </LinearLayout>

    <!-- 设置时钟的按钮 -->

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="50dp" >

        <Button
            android:id="@+id/setBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_gravity="center_horizontal"
            android:layout_marginLeft="25dp"
            android:background="@drawable/btn_clock_normal"
            android:gravity="center"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:text="确定"
            android:textColor="#000000"
            android:textSize="24sp" />

        <Button
            android:id="@+id/cancleBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_gravity="center_horizontal"
            android:layout_marginRight="25dp"
            android:background="@drawable/btn_clock_normal"
            android:gravity="center"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:text="取消"
            android:textColor="#000000"
            android:textSize="24sp" />
    </RelativeLayout>

</LinearLayout>

为了让自定义的Dialog的样式更好看，这里还需要自定义样式的Style，Style的代码如下；

<style name="CustomerDateDialog" parent="@android:Theme.Dialog">
        <item name="android:windowFrame">@null</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowBackground">@color/light_grey</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowContentOverlay">@null</item>
    </style>

到这里基本上就完了。你看懂了吗？好好研究吧！

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