SeekBar 本身有就是一个View 对象,既然是View 对象那也证明它有setOnLongClickListener 事件,众所周知,这个事件是让一个View 对象拥有长按功能,进而达到我们想要实现的操作。

  为SeekBar 添加长按事件监听如下:

 

SeekBar.setOnLongClickListener(new OnLongClickListener() {
            
            @Override
            public boolean onLongClick(View v) {
                // TODO Auto-generated method stub
                return false;
            }
        });

 

那么,我们来试试,它是否可以成立 ,为它添加一个Toast :

 

Toast.makeText(ttActivty.this, "fda", 100).show();

 

一般来说,我们运行项目,然后长按SeekBar 即能够把Toast Show 出来。那么试一下吧,试了之后结果很让人费解,因为我们知道SeekBar 继承自AbsSeekBar 而AbsSeekBar 又是继承自ProgressBar ,而ProgressBar 的长按事件是可行的,可是这里我们同样的操作却得不到效果,Toast 并不能像我们如期想像的一样显示出来。那是不是就是说SeekBar 不支持长按事件呢?这点我也不好下定论,总之我们为其他同样的View 对象的操作是可行的。好了,既然SeekBar 可能不支持长按事件,那我们就为它模拟一个长按事件,模拟思路如下:

  • 1、继承SeekBar 重写内部的事件和方法
  • 2、实现一个线程,当在规定的时间内停住即认为其是一个长按动作
  • 3、实现长按事件的接口函数
  • 4、并为重写的SeekBar 添加自己的OnSeekBarChangeListener 监听事件

具体操作看如下:

 

1、继承SeekBar 重写内部的事件和方法

代码如下:

 

public class seekBarDemo extends SeekBar implements OnTouchListener

 

 

2、实现一个线程,当在规定的时间内停住即认为其是一个长按动作

 

 这里实现一个自己的Runable 对象,向Handler 对象发送消息,代码如下:

 

/**
         * 为runable 赋值
         */
        runable = new Runnable() {
            @Override
            public void run() {
                // TODO Auto-generated method stub
                do {
                    i++;
                    try {
                        Thread.sleep(400);
                        Message msg = hand.obtainMessage();
                        msg.arg1 = i;
                        msg.sendToTarget();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                } while (isStop);
            }
        };

 

之后实现一个handler 对象用来设置该重写View 具有的长按事件

3、实现长按事件的接口函数

/**
     * 获取一个handler 对象
     * @param 0代表onTouch 1代表onChange
     * @param 视图对象
     * @param 进度
     * @return 返回一个handler对象
     */
    public Handler getHandler(final int j, final View v, final int progress) {
        Handler h = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                // TODO Auto-generated method stub
                switch (j) {
                case 0:
                    if (msg.arg1 == 3) {
                        if (longClick != null) {
                            longClick.onLongClick(v);
                        }
                    }
                    break;
                case 1:
                    if (msg.arg1 == 1) {
                        pp = progress;
                    }
                    if (msg.arg1 == 2) {
                        if (pp != progress) {
                            i = 0;
                        }
                    }
                    if (msg.arg1 == 3) {
                        i = 0;
                        if (pp == progress) {
                            if (longClick != null) {
                                longClick.onLongClick(seekBarDemo.this);
                            }
                        }
                    }
                    break;
                }
                super.handleMessage(msg);
            }
        };
        return h;
    }

 

 

4、并为重写的SeekBar 添加自己的OnSeekBarChangeListener 监听事件

这里我们首先定义一个onChange 接口 ,接口中有三未实现的方法,分别代表SeekBar 的三种状态

 

/**
     * 进度改变接口
     * @author terry
     *
     */
    public interface onChange {
        public void onStopTrackingTouch(seekBarDemo seekBar);

        public void onStartTrackingTouch(seekBarDemo seekBar);

        public void onProgressChanged(seekBarDemo seekBar, int progress,
                boolean fromUser);
    }

 

实现接口函数:

 

this.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                if (SeekBarChange != null) {
                    SeekBarChange.onStopTrackingTouch(seekBarDemo.this);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                if (SeekBarChange != null) {
                    SeekBarChange.onStartTrackingTouch(seekBarDemo.this);
                }
            }

            @Override
            public void onProgressChanged(final SeekBar seekBar,
                    final int progress, boolean fromUser) {
                if (SeekBarChange != null) {
                    SeekBarChange.onProgressChanged(seekBarDemo.this, progress,
                            fromUser);
                }
                hand = getHandler(1, seekBarDemo.this, progress);
            }
        });

 

 

 

完整的参考代码如下:

 

package org.lytsing.android.qzoneloading;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.SeekBar;

public class seekBarDemo extends SeekBar implements OnTouchListener {

    private onLong longClick;

    /**
     * 长按接口
     * @author terry
     *
     */
    public interface onLong {
        public boolean onLongClick(View v);
    }

    private onChange SeekBarChange;

    /**
     * 进度改变接口
     * @author terry
     *
     */
    public interface onChange {
        public void onStopTrackingTouch(seekBarDemo seekBar);

        public void onStartTrackingTouch(seekBarDemo seekBar);

        public void onProgressChanged(seekBarDemo seekBar, int progress,
                boolean fromUser);
    }

     
    private Handler hand;
    private Runnable runable;
    private Thread th;
    public static int i = 0;
    private boolean isStop = false;
    public static int pp = 0;
    public int index = 0;

    public seekBarDemo(Context context) {
        this(context, null);
        // TODO Auto-generated constructor stub
    }

    public seekBarDemo(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.setOnTouchListener(this);
        this.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                if (SeekBarChange != null) {
                    SeekBarChange.onStopTrackingTouch(seekBarDemo.this);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                if (SeekBarChange != null) {
                    SeekBarChange.onStartTrackingTouch(seekBarDemo.this);
                }
            }

            @Override
            public void onProgressChanged(final SeekBar seekBar,
                    final int progress, boolean fromUser) {
                if (SeekBarChange != null) {
                    SeekBarChange.onProgressChanged(seekBarDemo.this, progress,
                            fromUser);
                }
                hand = getHandler(1, seekBarDemo.this, progress);
            }
        });
        /**
         * 为runable 赋值
         */
        runable = new Runnable() {
            @Override
            public void run() {
                // TODO Auto-generated method stub
                do {
                    i++;
                    try {
                        Thread.sleep(400);
                        Message msg = hand.obtainMessage();
                        msg.arg1 = i;
                        msg.sendToTarget();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                } while (isStop);
            }
        };
    }

    /**
     * 获取一个handler 对象
     * @param 0代表onTouch 1代表onChange
     * @param 视图对象
     * @param 进度
     * @return 返回一个handler对象
     */
    public Handler getHandler(final int j, final View v, final int progress) {
        Handler h = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                // TODO Auto-generated method stub
                switch (j) {
                case 0:
                    if (msg.arg1 == 3) {
                        if (longClick != null) {
                            longClick.onLongClick(v);
                        }
                    }
                    break;
                case 1:
                    if (msg.arg1 == 1) {
                        pp = progress;
                    }
                    if (msg.arg1 == 2) {
                        if (pp != progress) {
                            i = 0;
                        }
                    }
                    if (msg.arg1 == 3) {
                        i = 0;
                        if (pp == progress) {
                            if (longClick != null) {
                                longClick.onLongClick(seekBarDemo.this);
                            }
                        }
                    }
                    break;
                }
                super.handleMessage(msg);
            }
        };
        return h;
    }

    /**
     * 设置长按事件
     * @param longClick
     */
    public void setOnLongSeekBarClick(onLong longClick) {
        this.longClick = longClick;
    }

    /**
     * 设置进度改变事件
     * @param change
     */
    public void setOnSeekBarChange(onChange change) {
        this.SeekBarChange = change;
    }

    @Override
    public boolean onTouch(final View v, MotionEvent event) {
        // TODO Auto-generated method stub
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            isStop = true;
            th = new Thread(runable);
            th.start();
            i = 0;
            hand = getHandler(0, v, 0);
            break;
        case MotionEvent.ACTION_UP:
            isStop = false;
            break;
        }
        return false;
    }
}

 

在布局的XML可以如下定义:

 

<org.lytsing.android.qzoneloading.seekBarDemo
        android:max="200" android:id="@+id/seek" android:layout_width="fill_parent"
        android:layout_height="wrap_content">
    </org.lytsing.android.qzoneloading.seekBarDemo>

 

 

功能至此完成,在前台可以像我们之前使用SeekBar 一样使用,功能一样,大家也可以根据自己的需求再另行扩展。这里给出的只是一个思路。