随着按钮被按下，继续增加整数值 [英] Continuously increase integer value as the button is pressed
问题描述
我是Android的新手，很抱歉，问题很容易回答。我有两个按钮，一个减少和一个增加按钮，在它们的中间一个TextView显示一个值。
当我点击减少按钮，当我点击增加按钮时，TextView减小并增加，没有问题，我得到了工作，但问题是只有一次点击增加/减少1。我想要实现的是，当我不断按下按钮（例如增加按钮）时，值也不断增加，只有当我释放增加按钮时才停止。
$ b $这是可能吗？如果是，您能否显示一些示例代码或参考如何实现？谢谢！
这是我的main.xml
<？ xml version =1.0encoding =utf-8？>
< RelativeLayout xmlns：android =http://schemas.android.com/apk/res/android
android：layout_width =fill_parent
android：layout_height =fill_parent
android：gravity =center>
< RelativeLayout
android：layout_width =fill_parent
android：layout_height =44dp
android：gravity =center_horizontal>
< Button android：id =@ + id / button1
android：layout_width =wrap_content
android：layout_height =wrap_content
android： layout_alignParentLeft =true
android：layout_alignParentTop =true
android：text =& lt />
< TextView android：id =@ + id / textView1
android：layout_width =50dp
android：layout_height =fill_parent
android： layout_alignBottom =@ + id / button1
android：layout_toRightOf =@ + id / button1
android：gravity =center
android：text =45/>
< Button android：id =@ + id / button2
android：layout_width =wrap_content
android：layout_height =wrap_content
android： layout_alignParentTop =true
android：layout_toRightOf =@ + id / textView1
android：text =& gt />
< / RelativeLayout>
< / RelativeLayout>
这里是我的Main.java
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class Main extends Activity {
private Button _decrease;
private Button _increase;
私有TextView _value;
private static int _counter = 45;
private String _stringVal;
@Override
public void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.main）;
_decrease =（Button）findViewById（R.id.button1）;
_increase =（Button）findViewById（R.id.button2）;
_value =（TextView）findViewById（R.id.textView1）;
_decrease.setOnClickListener（new OnClickListener（）{
@Override
public void onClick（View v）{
Log.d （src，减少值...）;
_counter--;
_stringVal = Integer.toString（_counter）;
_value.setText（_stringVal）;
}
}）;
_increase.setOnClickListener（new OnClickListener（）{
@Override
public void onClick（View v）{
Log.d （src，Increasing value ...）;
_counter ++;
_stringVal = Integer.toString（_counter）;
_value.setText（_stringVal）;
}
}）;
}
}
在您的活动中创建一个处理程序：
p> 私人处理程序repeatUpdateHandler = new Handler（）;
还有2个vars会声明：是递增还是递减？一次只有一个。
private boolean mAutoIncrement = false;
private boolean mAutoDecrement = false;
现在的数值
public int mValue;
另一个可以在另一个线程中运行的类：
pre>
class RptUpdater实现Runnable {
public void run（）{
if（mAutoIncrement）{
increment（）;
repeatUpdateHandler.postDelayed（新的RptUpdater（），REP_DELAY）;
} else if（mAutoDecrement）{
decrement（）;
repeatUpdateHandler.postDelayed（新的RptUpdater（），REP_DELAY）;
}
}
}
添加一个长按聆听者你的按钮：
mBTIncrement.setOnLongClickListener（
new View.OnLongClickListener（）{
public boolean onLongClick查看arg0）{
mAutoIncrement = true;
repeatUpdateHandler.post（new RptUpdater（））;
return false;
}
}
）;
mBTIncrement.setOnTouchListener（new View.OnTouchListener（）{
public boolean onTouch（View v，MotionEvent event）{
if（（event.getAction（）== MotionEvent。 ACTION_UP || event.getAction（）== MotionEvent.ACTION_CANCEL）
&& amp; mAutoIncrement）{
mAutoIncrement = false;
}
return false;
}
}）;
在上述情况下，按钮是增量按钮。创建另一个将mAutoDecrement设置为true的按钮。
和reduce（）将是一个函数，它将设置您的实例int变量，如下所示：
public void decrement（）{
mValue--;
_value.setText（+ mValue）;
}
你计算出增量。哦，REP_DELAY是一个静态int变量，设置为50。
我看到这是Jeffrey Cole的开源NumberPicker的摘录，可在 http://www.technologichron.net/ 必须添加适当的作者归因。
I'm new to Android so sorry if the question is easy to answer. I have two buttons, a decrease and an increase button, and in the middle of them a TextView which displays a value.
When I hit the decrease button, the value in the TextView decreases and increases when I hit the increase button, no problem with that, I got that working but the problem is the value only increases/decreases by 1 on a single click. What I'm trying to achieve is that as I continuously press the button (the increase button for example), the value is also continuously increasing and only stops when I release the increase button.
Is that possible? If so, can you show some sample code or references on how to implement that? Thanks!
Here is my main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="44dp"
android:gravity="center_horizontal" >
<Button android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="<" />
<TextView android:id="@+id/textView1"
android:layout_width="50dp"
android:layout_height="fill_parent"
android:layout_alignBottom="@+id/button1"
android:layout_toRightOf="@+id/button1"
android:gravity="center"
android:text="45" />
<Button android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/textView1"
android:text=">" />
</RelativeLayout>
</RelativeLayout>
and here is my Main.java
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class Main extends Activity {
private Button _decrease;
private Button _increase;
private TextView _value;
private static int _counter = 45;
private String _stringVal;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
_decrease = (Button) findViewById(R.id.button1);
_increase = (Button) findViewById(R.id.button2);
_value = (TextView) findViewById(R.id.textView1);
_decrease.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.d("src", "Decreasing value...");
_counter--;
_stringVal = Integer.toString(_counter);
_value.setText(_stringVal);
}
});
_increase.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.d("src", "Increasing value...");
_counter++;
_stringVal = Integer.toString(_counter);
_value.setText(_stringVal);
}
});
}
}
For that to work, you need a thread that will update the integer value when you long press on a button.
Create a handler in your activity:
private Handler repeatUpdateHandler = new Handler();
And 2 vars which will state: is it increment or decrement? Only one set at a time.
private boolean mAutoIncrement = false;
private boolean mAutoDecrement = false;
And the present number value
public int mValue;
And a class that will run in another thread:
class RptUpdater implements Runnable {
public void run() {
if( mAutoIncrement ){
increment();
repeatUpdateHandler.postDelayed( new RptUpdater(), REP_DELAY );
} else if( mAutoDecrement ){
decrement();
repeatUpdateHandler.postDelayed( new RptUpdater(), REP_DELAY );
}
}
}
Add a long press listener to your button:
mBTIncrement.setOnLongClickListener(
new View.OnLongClickListener(){
public boolean onLongClick(View arg0) {
mAutoIncrement = true;
repeatUpdateHandler.post( new RptUpdater() );
return false;
}
}
);
mBTIncrement.setOnTouchListener( new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if( (event.getAction()==MotionEvent.ACTION_UP || event.getAction()==MotionEvent.ACTION_CANCEL)
&& mAutoIncrement ){
mAutoIncrement = false;
}
return false;
}
});
In the above case the button is the increment one. Create another button which will set mAutoDecrement to true.
And decrement() will be a function, which will set your instance int variable like this:
public void decrement(){
mValue--;
_value.setText( ""+mValue );
}
You figure the increment out. Oh and REP_DELAY is a static int variable set to 50.
I see this is an excerpt from Jeffrey Cole's open source NumberPicker available at http://www.technologichron.net/ Proper author's attribution must be added.
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