Java Android应用程序-根据按下的次数从按钮输入整数
我正在使用android studio为android编写一个计算器应用程序。我想用4个按钮来输入值和函数。然而，我目前的做法是从按钮上的文字输入。因此，对于我的按钮1/2/3，当按下此按钮时，1/2/3将传递到textView 以下是我的主要活动：Java Android应用程序-根据按下的次数从按钮输入整数,java,android,button,Java,Android,Button,我正在使用android studio为android编写一个计算器应用程序。我想用4个按钮来输入值和函数。然而，我目前的做法是从按钮上的文字输入。因此，对于我的按钮1/2/3，当按下此按钮时，1/2/3将传递到textView 以下是我的主要活动： package com.example.myfirstapp; import android.media.MediaPlayer; import android.support.v7.app.ActionBarActivity; impor
package com.example.myfirstapp;
import android.media.MediaPlayer;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.MediaController;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
private int[] operatorButtons = {R.id.operators};
private int[] numericButtons = {R.id.onetwothree, R.id.fourfivesix, R.id.seveneightninezero};
private boolean lastNumeric, stateError;
private TextView txtScreen;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find the TextView
this.txtScreen = (TextView) findViewById(R.id.txtScreen);
// Find and set OnClickListener to numeric buttons
setNumericOnClickListener();
// Find and set OnClickListener to operator buttons, equal button and decimal point button
setOperatorOnClickListener();
}
private void setNumericOnClickListener() {
// Create a common OnClickListener
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// Just append/set the text of clicked button
Button button = (Button) v;
if (stateError) {
// If current state is Error, replace the error message
txtScreen.setText(button.getText());
stateError = false;
} else {
// If not, already there is a valid expression so append to it
txtScreen.append(button.getText());
}
// Set the flag
lastNumeric = true;
}
};
// Assign the listener to all the numeric buttons
for (int id : numericButtons) {
findViewById(id).setOnClickListener(listener);
}
}
private void setOperatorOnClickListener() {
// Create a common OnClickListener for operators
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// If the current state is Error do not append the operator
// If the last input is number only, append the operator
if (lastNumeric && !stateError) {
Button button = (Button) v;
txtScreen.append(button.getText());
lastNumeric = false;
}
}
};
// Assign the listener to all the operator buttons
for (int id : operatorButtons) {
findViewById(id).setOnClickListener(listener);
}
// Equal button
/*findViewById(R.id.btnEqual).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onEqual();
}
});*/
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/txtScreen"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:gravity="right|center_vertical"
android:maxLength="16"
android:padding="10dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="30sp"
android:typeface="serif" />
<!--<Button-->
<!--android:id="@+id/equal1"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="100dp"-->
<!--android:text="="-->
<!--/>-->
<Button
android:id="@+id/equal2"
android:layout_width="match_parent"
android:layout_height="100dp"
android:text="="
android:layout_alignParentBottom="true"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/txtScreen"
android:orientation="vertical"
android:layout_above="@id/equal2">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="@+id/onetwothree"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="1/2/3"/>
<Button
android:id="@+id/fourfivesix"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="4/5/6"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="@+id/seveneightninezero"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="7/8/9/0"/>
<Button
android:id="@+id/operators"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="+-*/"/>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
Ben您可以使用定时器或延迟变量来检测单、双或三次抽头。这可能很有趣。如果时间间隔不是一个因素，您可以只跟踪上次按下的按钮，如果再次按下相同的按钮，则相应地更新文本 如果您遵循方法一，则按钮的单击侦听器的代码可能如下所示（我注释了
setNumericOnClickListener（）setOperatorOnClickListener（）main活动onCreate
中添加了以下内容）：
Button onetwother=（Button）findViewById（R.id.onetwother）；
setOnTouchListener（新视图.OnTouchListener（））{
Handler=newhandler（）；
int numberOfTaps=0；
长lastTapTimeMs=0；
长接地毫秒=0；
@凌驾
公共布尔onTouch（视图v，运动事件）{
开关（event.getAction（））{
case MotionEvent.ACTION\u DOWN：
touchtownms=System.currentTimeMillis（）；
打破
case MotionEvent.ACTION\u UP：
handler.removeCallbacksAndMessages（null）；
if（（System.currentTimeMillis（）-touchDownMs）>ViewConfiguration.getTapTimeout（））{
//那不是水龙头
点击次数=0；
lastTapTimeMs=0；
打破
}
如果（点击次数>0
&&（System.currentTimeMillis（）-lastTapTimeMs）
完成主要活动：
package com.example.myfirstapp;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
private int[] operatorButtons = {R.id.operators};
private int[] numericButtons = {R.id.onetwothree, R.id.fourfivesix, R.id.seveneightninezero};
private boolean lastNumeric, stateError;
private TextView txtScreen;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find the TextView
this.txtScreen = (TextView) findViewById(R.id.txtScreen);
// Find and set OnClickListener to numeric buttons
// setNumericOnClickListener();
// Find and set OnClickListener to operator buttons, equal button and decimal point button
// setOperatorOnClickListener();
Button onetwothree = (Button) findViewById(R.id.onetwothree);
onetwothree.setOnTouchListener(new View.OnTouchListener() {
Handler handler = new Handler();
int numberOfTaps = 0;
long lastTapTimeMs = 0;
long touchDownMs = 0;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touchDownMs = System.currentTimeMillis();
break;
case MotionEvent.ACTION_UP:
handler.removeCallbacksAndMessages(null);
if ((System.currentTimeMillis() - touchDownMs) > ViewConfiguration.getTapTimeout()) {
//it was not a tap
numberOfTaps = 0;
lastTapTimeMs = 0;
break;
}
if (numberOfTaps > 0
&& (System.currentTimeMillis() - lastTapTimeMs) < ViewConfiguration.getDoubleTapTimeout()) {
numberOfTaps += 1;
} else {
numberOfTaps = 1;
}
lastTapTimeMs = System.currentTimeMillis();
if (numberOfTaps == 1) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
if (txtScreen.getText().toString() == "") {
txtScreen.setText("1");
} else txtScreen.append("1");
}
}, ViewConfiguration.getDoubleTapTimeout());
}else if (numberOfTaps == 2) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
if (txtScreen.getText().toString() == "") {
txtScreen.setText("2");
} else txtScreen.append("2");
}
}, ViewConfiguration.getDoubleTapTimeout());
} else if (numberOfTaps == 3) {
if (txtScreen.getText().toString() == "") {
txtScreen.setText("3");
} else txtScreen.append("3");
}
}
return false;
}
});
}
private void setNumericOnClickListener() {
// Create a common OnClickListener
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// Just append/set the text of clicked button
Button button = (Button) v;
if (stateError) {
// If current state is Error, replace the error message
txtScreen.setText(button.getText());
stateError = false;
} else {
// If not, already there is a valid expression so append to it
txtScreen.append(button.getText());
}
// Set the flag
lastNumeric = true;
}
};
// Assign the listener to all the numeric buttons
for (int id : numericButtons) {
findViewById(id).setOnClickListener(listener);
}
}
private void setOperatorOnClickListener() {
// Create a common OnClickListener for operators
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// If the current state is Error do not append the operator
// If the last input is number only, append the operator
if (lastNumeric && !stateError) {
Button button = (Button) v;
txtScreen.append(button.getText());
lastNumeric = false;
}
}
};
// Assign the listener to all the operator buttons
for (int id : operatorButtons) {
findViewById(id).setOnClickListener(listener);
}
}
}
package com.example.myfirstapp；
导入android.os.Bundle；
导入android.os.Handler；
导入android.support.v7.app.ActionBarActivity；
导入android.view.MotionEvent；
导入android.view.view；
导入android.view.ViewConfiguration；
导入android.widget.Button；
导入android.widget.TextView；
公共类MainActivity扩展了ActionBarActivity{
私有int[]运算符按钮={R.id.operators}；
private int[]numericButtons={R.id.onetwother，R.id.fourfivesix，R.id.seveneightninezero}；
私有布尔lastNumeric，stateError；
私有文本视图txtScreen；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
//查找文本视图
this.txtScreen=（TextView）findViewById（R.id.txtScreen）；
//查找并将OnClickListener设置为数字按钮
//setNumericOnClickListener（）；
//查找并设置OnClickListener到运算符按钮、相等按钮和小数点按钮
//setOperatorOnClickListener（）；
按钮onetwother=（按钮）findViewById（R.id.onetwother）；
setOnTouchListener（新视图.OnTouchListener（））{
Handler=newhandler（）；
int numberOfTaps=0；
长lastTapTimeMs=0；
长接地毫秒=0；
@凌驾
公共布尔onTouch（视图v，运动事件）{
开关（event.getAction（））{
case MotionEvent.ACTION\u DOWN：
touchtownms=System.currentTimeMillis（）；
打破
case MotionEvent.ACTION\u UP：
handler.removeCallbacksAndMessages（null）；
if（（System.currentTimeMillis（）-touchDownMs）>ViewConfiguration.getTapTimeout（））{
//那不是水龙头
点击次数=0；
最后一次=
package com.example.myfirstapp;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
private int[] operatorButtons = {R.id.operators};
private int[] numericButtons = {R.id.onetwothree, R.id.fourfivesix, R.id.seveneightninezero};
private boolean lastNumeric, stateError;
private TextView txtScreen;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find the TextView
this.txtScreen = (TextView) findViewById(R.id.txtScreen);
// Find and set OnClickListener to numeric buttons
// setNumericOnClickListener();
// Find and set OnClickListener to operator buttons, equal button and decimal point button
// setOperatorOnClickListener();
Button onetwothree = (Button) findViewById(R.id.onetwothree);
onetwothree.setOnTouchListener(new View.OnTouchListener() {
Handler handler = new Handler();
int numberOfTaps = 0;
long lastTapTimeMs = 0;
long touchDownMs = 0;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touchDownMs = System.currentTimeMillis();
break;
case MotionEvent.ACTION_UP:
handler.removeCallbacksAndMessages(null);
if ((System.currentTimeMillis() - touchDownMs) > ViewConfiguration.getTapTimeout()) {
//it was not a tap
numberOfTaps = 0;
lastTapTimeMs = 0;
break;
}
if (numberOfTaps > 0
&& (System.currentTimeMillis() - lastTapTimeMs) < ViewConfiguration.getDoubleTapTimeout()) {
numberOfTaps += 1;
} else {
numberOfTaps = 1;
}
lastTapTimeMs = System.currentTimeMillis();
if (numberOfTaps == 1) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
if (txtScreen.getText().toString() == "") {
txtScreen.setText("1");
} else txtScreen.append("1");
}
}, ViewConfiguration.getDoubleTapTimeout());
}else if (numberOfTaps == 2) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
if (txtScreen.getText().toString() == "") {
txtScreen.setText("2");
} else txtScreen.append("2");
}
}, ViewConfiguration.getDoubleTapTimeout());
} else if (numberOfTaps == 3) {
if (txtScreen.getText().toString() == "") {
txtScreen.setText("3");
} else txtScreen.append("3");
}
}
return false;
}
});
}
private void setNumericOnClickListener() {
// Create a common OnClickListener
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// Just append/set the text of clicked button
Button button = (Button) v;
if (stateError) {
// If current state is Error, replace the error message
txtScreen.setText(button.getText());
stateError = false;
} else {
// If not, already there is a valid expression so append to it
txtScreen.append(button.getText());
}
// Set the flag
lastNumeric = true;
}
};
// Assign the listener to all the numeric buttons
for (int id : numericButtons) {
findViewById(id).setOnClickListener(listener);
}
}
private void setOperatorOnClickListener() {
// Create a common OnClickListener for operators
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// If the current state is Error do not append the operator
// If the last input is number only, append the operator
if (lastNumeric && !stateError) {
Button button = (Button) v;
txtScreen.append(button.getText());
lastNumeric = false;
}
}
};
// Assign the listener to all the operator buttons
for (int id : operatorButtons) {
findViewById(id).setOnClickListener(listener);
}
}
}
(Button) plusBtn = (Button) findViewById(R.id.plusBtn);
plusBtn.setOnClickListener(new OnClickListener(){
@Override
public voidonClick(View v){
number1 = Integer.parseInt(txtScreen.getText().toString());
});