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2015-06-27 15:46 429 查看

自定义倒计时控件

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5、andriod开发 2014-12-17 09:16
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目录(?)[+]

一自定义倒计时控件TimerTextView
二控件使用

前言:这几天博客积的有点多,工作也是忙的够呛.

先上本篇效果图:

就是自定义一个能倒计时的TextView控件,当我们点击start run按钮时,给他传进去一个时间数字,它自己开始倒计时,不需要外部任何干预。当点击Stop run按钮时,停止倒计时。



一、自定义倒计时控件——TimerTextView

显然TimerTextView应该派生于TextView,因为他本就是显示一串Text,只是具有了自动更新的功能,这里的自动更新的实现当然只通过线程来实现了,所以要继承Runnable接口。所以它的定义应该是这样的:

[java]
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public class TimerTextView extends TextView implements Runnable{

public TimerTextView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub

}
@Override
public void run() {
//自动更新

}

}

public class TimerTextView extends TextView implements Runnable{
	
	public TimerTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
	}
    @Override
    public void run() {
        //自动更新
    	
    }

}
首先,要给外部提供一个函数,可以给它设置要开始倒计时的数字:

[java]
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private long mday, mhour, mmin, msecond;//天,小时,分钟,秒

private long mday, mhour, mmin, msecond;//天,小时,分钟,秒


[java]
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public void setTimes(long[] times) {
mday = times[0];
mhour = times[1];
mmin = times[2];
msecond = times[3];

}

public void setTimes(long[] times) {
    mday = times[0];
    mhour = times[1];
    mmin = times[2];
    msecond = times[3];

}
然后要实现当前线程的开始和终止,相关实现是下面几个函数:

[java]
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private boolean run=false; //是否启动了

private boolean run=false; //是否启动了


[java]
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public boolean isRun() {
return run;
}

public void beginRun() {
this.run = true;
run();
}

public void stopRun(){
this.run = false;
}

public boolean isRun() {
    return run;
}

public void beginRun() {
    this.run = true;
    run();
}

public void stopRun(){
	this.run = false;
}
这里定义一个变量run来标识当前线程是否已经启动,如果没有启动,我们可以调用beginRun()来开始线程,在beginRun()函数中,调用run()开线程开始运行,在线程中,我们就要实现一秒更新一次当前数字了:

[java]
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@Override
public void run() {
//标示已经启动
if(run){
ComputeTime();

String strTime= mday +"天:"+ mhour+"小时:"+ mmin+"分钟:"+msecond+"秒";
this.setText(strTime);

postDelayed(this, 1000);
}else {
removeCallbacks(this);
}
}

@Override
public void run() {
    //标示已经启动
    if(run){
    	ComputeTime();

        String strTime= mday +"天:"+ mhour+"小时:"+ mmin+"分钟:"+msecond+"秒";
        this.setText(strTime);

        postDelayed(this, 1000);
    }else {
    	removeCallbacks(this);
    }
}
首先判断当前线程应该具有的状态,如果还是在跑着(即run变量为true),那就计算当前应该显示的时间(ComputeTime()函数),然后设置给自己。最后利用postDelayed(this,1000),来延长1秒后再运行一次。

如果用户调用了StopRun()函数,将run变量置为了FALSE,即用户要停止线程运行,这里,我们调用removeCallbacks(this)来终止当前线程。

下面就是看看如何来计算当前要显示的时间的omputeTime()函数了:

[java]
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private void ComputeTime() {
msecond--;
if (msecond < 0) {
mmin--;
msecond = 59;
if (mmin < 0) {
mmin = 59;
mhour--;
if (mhour < 0) {
// 倒计时结束
mhour = 24;
mday--;

}
}

}

}

private void ComputeTime() {
    msecond--;
    if (msecond < 0) {
        mmin--;
        msecond = 59;
        if (mmin < 0) {
            mmin = 59;
            mhour--;
            if (mhour < 0) {
                // 倒计时结束
                mhour = 24;
                mday--;

            }
        }

    }

}
理解起来应该没什么难度,秒一次减一,如果减到0,一方面重置为59,另一方面分钟要减一,当分钟减到0时,一方面分钟置为59,一方面小时减一,天的计划一样,需要注意的是,一天是24个小时哦,不是60。

OK啦,重写控件的部分就讲完了,下面列出这块的完整代码,供大家参考:

[java]
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public class TimerTextView extends TextView implements Runnable{

public TimerTextView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub

}

private long mday, mhour, mmin, msecond;//天,小时,分钟,秒

private boolean run=false; //是否启动了


public void setTimes(long[] times) {
mday = times[0];
mhour = times[1];
mmin = times[2];
msecond = times[3];

}

/**
* 倒计时计算
*/
private void ComputeTime() {
msecond--;
if (msecond < 0) {
mmin--;
msecond = 59;
if (mmin < 0) {
mmin = 59;
mhour--;
if (mhour < 0) {
// 倒计时结束,一天有24个小时

mhour = 23;
mday--;

}
}

}

}

public boolean isRun() {
return run;
}

public void beginRun() {
this.run = true;
run();
}

public void stopRun(){
this.run = false;
}


@Override
public void run() {
//标示已经启动
if(run){
ComputeTime();

String strTime= mday +"天:"+ mhour+"小时:"+ mmin+"分钟:"+msecond+"秒";
this.setText(strTime);

postDelayed(this, 1000);
}else {
removeCallbacks(this);
}
}

}

public class TimerTextView extends TextView implements Runnable{
	
	public TimerTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
	}

    private long mday, mhour, mmin, msecond;//天,小时,分钟,秒
    private boolean run=false; //是否启动了

    public void setTimes(long[] times) {
        mday = times[0];
        mhour = times[1];
        mmin = times[2];
        msecond = times[3];

    }

    /**
     * 倒计时计算
     */
	private void ComputeTime() {
	    msecond--;
	    if (msecond < 0) {
	        mmin--;
	        msecond = 59;
	        if (mmin < 0) {
	            mmin = 59;
	            mhour--;
	            if (mhour < 0) {
	                // 倒计时结束,一天有24个小时
	                mhour = 23;
	                mday--;
	
	            }
	        }
	
	    }
	
	}

    public boolean isRun() {
        return run;
    }

    public void beginRun() {
        this.run = true;
        run();
    }
    
    public void stopRun(){
    	this.run = false;
    }
    

    @Override
    public void run() {
        //标示已经启动
        if(run){
        	ComputeTime();

            String strTime= mday +"天:"+ mhour+"小时:"+ mmin+"分钟:"+msecond+"秒";
            this.setText(strTime);

            postDelayed(this, 1000);
        }else {
        	removeCallbacks(this);
        }
    }

}

二、控件使用

下面我们就在MainActivity中使用一下,先看看MainActivity的布局(activity_main.xml)

从最开头的演示中也可以看出,使用的是垂直布局,两个BTN,一个倒计时TextView

[html]
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.trytimerview.MainActivity" >

<Button android:id="@+id/main_start_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="start run"/>

<Button android:id="@+id/main_stop_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="stop run"/>


<com.example.trytimerview.TimerTextView
android:id="@+id/timer_text_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textColor="#ff0000"
android:gravity="center_horizontal"
android:text="倒计时"
/>

</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.trytimerview.MainActivity" >
    
    <Button android:id="@+id/main_start_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="start run"/>
    
    <Button android:id="@+id/main_stop_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="stop run"/>
    

    <com.example.trytimerview.TimerTextView 
        android:id="@+id/timer_text_view"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:textColor="#ff0000"
        android:gravity="center_horizontal"
        android:text="倒计时"
        />

</LinearLayout>
然后是在MainActivity中,先列出整体的代码,然后再细讲:

[java]
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public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化倒计时控件
final TimerTextView timerTextView = (TimerTextView)findViewById(R.id.timer_text_view);
long[] times = {0,10,5,30};
timerTextView.setTimes(times);


Button startBtn = (Button)findViewById(R.id.main_start_btn);
Button stopBtn = (Button)findViewById(R.id.main_stop_btn);
//开始倒计时
startBtn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub

if(!timerTextView.isRun()){
timerTextView.beginRun();
}
}
});

//停止倒计时
stopBtn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub

if(timerTextView.isRun()){
timerTextView.stopRun();
}
}
});

}

}

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//初始化倒计时控件
		final TimerTextView timerTextView = (TimerTextView)findViewById(R.id.timer_text_view);
		long[] times = {0,10,5,30};
		timerTextView.setTimes(times);
		
		
		Button startBtn =  (Button)findViewById(R.id.main_start_btn);
		Button stopBtn  =  (Button)findViewById(R.id.main_stop_btn);
		//开始倒计时
		startBtn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				if(!timerTextView.isRun()){
					timerTextView.beginRun();
				}
			}
		});
		
		//停止倒计时
		stopBtn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				if(timerTextView.isRun()){
					timerTextView.stopRun();
				}
			}
		});

	}

}
这里首先是,初始化TimerTextView控件:

初始化为从10个小时,5分钟,30秒开始倒计时

[java]
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final TimerTextView timerTextView = (TimerTextView)findViewById(R.id.timer_text_view);
long[] times = {0,10,5,30};
timerTextView.setTimes(times);

final TimerTextView timerTextView = (TimerTextView)findViewById(R.id.timer_text_view);
long[] times = {0,10,5,30};
timerTextView.setTimes(times);
然后当用户点击StartRun按钮时,先判断当前是否在运行,如果没在运行,就让它开始跑起来:

[java]
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startBtn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub

if(!timerTextView.isRun()){
timerTextView.beginRun();
}
}
});

startBtn.setOnClickListener(new View.OnClickListener() {
	
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		if(!timerTextView.isRun()){
			timerTextView.beginRun();
		}
	}
});
当用户点击Stop Run按钮时,停止运行:

[java]
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stopBtn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub

if(timerTextView.isRun()){
timerTextView.stopRun();
}
}
});

stopBtn.setOnClickListener(new View.OnClickListener() {
	
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		if(timerTextView.isRun()){
			timerTextView.stopRun();
		}
	}
});


OK啦,这篇比较简单,代码量也比较小,就不再多说了。

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源码下载地址:http://download.csdn.net/detail/harvic880925/8271087

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