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！