How to get all Buttons ID's in one time on Android

问题

I have 16 Buttons in my Activity and I have to initialize those inside onCreate(). Is there any way to initialize all buttons in one single line code?(loops etc.) Code should take all buttons R.id. from XML Layout and process....

回答1:

Let's say you named your button button_0, button_1, .. button_15. You can do:

for (int i = 0; i < 16; i++) {
    int id = getResources().getIdentifier("button_"+i, "id", getPackageName());
    button[i] = (Button) findViewById(id);
}

回答2:

Well, if all 16 of those buttons are inside one view or layout, then you could do the following.

ArrayList<View> allButtons; 
allButtons = ((LinearLayout) findViewById(R.id.button_container)).getTouchables();

This assumes that your container (in this example a LinearLayout) contains no Touchable that is not a Button.

回答3:

use Butterknife view injections library
Download Android ButterKnife Zelezny plugin for Android Studio or Intellij IDEA and initialize all your views from current layout by 1 click

回答4:

For xamarin android :

List<Button>() allButtons = new List<Button>();
for (int i = 1; i < 15; i++)
{
    int id = this.Resources.GetIdentifier("btn" + i.ToString(), "id", this.PackageName);
    Button btn = (Button)FindViewById(id);
    allButtons.Add(btn);

}

回答5:

This method takes all buttons inside the layout, hope it helps. Easy to implement & you can use it for almost every project, no libraries required.

public List<Button> getAllButtons(ViewGroup layout){
        List<Button> btn = new ArrayList<>();
        for(int i =0; i< layout.getChildCount(); i++){
            View v =layout.getChildAt(i);
            if(v instanceof Button){
                btn.add((Button) v);
            }
        }
        return btn;
    }

Example

List<Button> btn_list = getAllButtons(myRelativeLayout);
Button my_btn = btn_list.get(0);
my_btn.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View view) {
                Log.d("btn_test", "onClick: hello");
     }
});

来源：https://stackoverflow.com/questions/22639218/how-to-get-all-buttons-ids-in-one-time-on-android

标签

android

android-layout

android-xml