多个按钮的 OnClickListener() android

我目前正在 Android 上开发一个简单的计算器应用程序。进出口试图设置的代码，以便当一个数字按钮按下它更新计算器屏幕与该数字。现在我是这样做的。

    Button one = (Button) findViewById(R.id.oneButton);
one.setOnClickListener(new View.OnClickListener() {


@Override
public void onClick(View v) {
TextView output = (TextView) findViewById(R.id.output);
output.append("1");
}
});

它工作，但我正在为计算器上的每一个按钮编写相同的代码。你可以想象这是多余的。有没有什么方法可以让我更有效率地编写这段代码呢？一个涉及不为每个按钮编写此方法的方法？

230051 次浏览
小开

You could set the property:

android:onClick="buttonClicked"

in the xml file for each of those buttons, and use this in the java code:

public void buttonClicked(View view) {


if (view.getId() == R.id.button1) {
// button1 action
} else if (view.getId() == R.id.button2) {
//button2 action
} else if (view.getId() == R.id.button3) {
//button3 action
}


}
小开

You can use this

    TextView output = (TextView) findViewById(R.id.output);
one.setOnClickListener(youractivity.this);
// set the onclicklistener for other buttons also


@Override
public void onClick(View v) {
int id = v.getId();
switch(id) {
case R.id.oneButton:
append("1",output);
break;
case R.id.twoButton:
append("2",output);
break;
case R.id.threeButton:
append("3",output);
break;
}
}


private void append(String s,TextView t){
t.setText(s);
}

you can identify the views in your activity in a separate method.

小开
最佳答案

You Just Simply have to Follow these steps for making it easy...

You don't have to write new onClickListener for Every Button... Just Implement View.OnClickLister to your Activity/Fragment.. it will implement new Method called onClick() for handling onClick Events for Button,TextView` etc.

  1. Implement OnClickListener() in your Activity/Fragment
public class MainActivity extends Activity implements View.OnClickListener {


}
  1. Implement onClick() method in your Activity/Fragment
public class MainActivity extends Activity implements View.OnClickListener {
    

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
    

@Override
public void onClick(View v) {
// default method for handling onClick Events..
}
}
  1. Implement OnClickListener() For Buttons
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
    

setContentView(R.layout.your_layout);
    

Button one = (Button) findViewById(R.id.oneButton);
one.setOnClickListener(this); // calling onClick() method
Button two = (Button) findViewById(R.id.twoButton);
two.setOnClickListener(this);
Button three = (Button) findViewById(R.id.threeButton);
three.setOnClickListener(this);
}
  1. Find Buttons By Id and Implement Your Code..
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.oneButton:
// do your code
break;
case R.id.twoButton:
// do your code
break;
case R.id.threeButton:
// do your code
break;
default:
break;
}
}

Please refer to this link for more information :

https://androidacademic.blogspot.com/2016/12/multiple-buttons-onclicklistener-android.html (updated)

This will make easier to handle many buttons click events and makes it looks simple to manage it...

小开

Set a Tag on each button to whatever you want to work with, in this case probably an Integer. Then you need only one OnClickListener for all of your buttons:

Button one = (Button) findViewById(R.id.oneButton);
Button two = (Button) findViewById(R.id.twoButton);
one.setTag(new Integer(1));
two.setTag(new Integer(2));


OnClickListener onClickListener = new View.OnClickListener() {


@Override
public void onClick(View v) {
TextView output = (TextView) findViewById(R.id.output);
output.append(v.getTag());
}
}


one.setOnClickListener(onClickListener);
two.setOnClickListener(onClickListener);
小开

I created dedicated class that implements View.OnClickListener.

public class ButtonClickListener implements View.OnClickListener {


@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Button Clicked", Toast.LENGTH_SHORT).show();
}


}

Then, I created an instance of this class in MainActivity

private ButtonClickListener onClickBtnListener = new ButtonClickListener();

and then set onClickListener for button

btn.setOnClickListener(onClickBtnListener);
小开

I had a similar issue and what I did is: Create a array of Buttons

Button buttons[] = new Button[10];

Then to implement on click listener and reference xml id's I used a loop like this

for (int i = 0; i < 10; i++) {
String buttonID = "button" + i;
int resID = getResources().getIdentifier(buttonID, "id",
"your package name here");
buttons[i] = (Button) findViewById(resID);
buttons[i].setOnClickListener(this);
}

But calling them up remains same as in Prag's answer point 4. PS- If anybody has a better method to call up all the button's onClick, please do comment.

小开 
public class MainActivity extends AppCompatActivity implements OnClickListener  {
Button  b1,b2;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1= (Button) findViewById(R.id.button);
b2= (Button) findViewById(R.id.button2);
b1.setOnClickListener(this);
b2.setOnClickListener(this);
}




@Override
public void onClick(View v)
{
if(v.getId()==R.id.button)
{
Intent intent=new Intent(getApplicationContext(),SignIn.class);
startActivity(intent);
}
else if (v.getId()==R.id.button2)
{
Intent in=new Intent(getApplicationContext(),SignUpactivity.class);
startActivity(in);
}
}
}
小开

Implement onClick() method in your Activity/Fragment public class MainActivity extends Activity implements View.OnClickListener {

    @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}


@Override
public void onClick(View v) {
switch (itemId) {


// if you call the fragment with nevigation bar then used.


case R.id.nav_menu1:
fragment = new IntroductionFragment();
break;


// if call activity with nevigation bar then used.


case R.id.nav_menu6:
Intent i = new Intent(MainActivity.this, YoutubeActivity.class);
startActivity(i);
// default method for handling onClick Events..
}
}
小开 
public void onClick(View v) {
int id = v.getId();
switch (id){
case R.id.button1:
//do ur code
Toast.makeText(this,"This is button 1",Toast.LENGTH_SHORT).show();
break;
case R.id.button2:
Intent intent = new Intent(this,SecondActivity.class);
Intent.putExtra("key",value);
startActivity(intent);
break;
case R.id.button3:
//do ur code
break;
case R.id.button4:
//do ur code;
break;
default:
//do ur code;
}
}
小开

I find that using a long if/else chain (or switch), in addition to the list of findViewById(btn).setOnClickListener(this) is ugly. how about creating new View.OnlickListeners with override, in-line: 

findViewById(R.id.signInButton).setOnClickListener(new View.OnClickListener()
{ @Override public void onClick(View v) { signIn(); }});
findViewById(R.id.signOutButton).setOnClickListener(new View.OnClickListener()
{ @Override public void onClick(View v) { signOut(); }});
findViewById(R.id.keyTestButton).setOnClickListener(new View.OnClickListener()
{ @Override public void onClick(View v) { decryptThisTest(); }});
findViewById(R.id.getBkTicksButton).setOnClickListener(new View.OnClickListener()
{ @Override public void onClick(View v) { getBookTickers(); }});
findViewById(R.id.getBalsButton).setOnClickListener(new View.OnClickListener()
{ @Override public void onClick(View v) { getBalances(); }});
小开

No need of if else's or switch, Let's start: In your every Button or whatever it is (I am using ImageView), Add this attribute android:onClick="DoSomeThing"

In your Activity:

public void DoSomeThing(View v){
ImageView img1= (ImageView) v; //you have to cast the view i.e. if it's button, it must be cast to Button like below line


Button b1= (Button) v;


img1.setImageBitmap(imageBitmap); //or anything you want to do with your view, This will work for all


b1.setText("Some Text");
 



}

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