是否可以在主java类中全局使用findViewById来获取对XML元素（例如按钮）的引用？
我有太多的引用，因此我需要多次重复调用它们，因为我无法使用在onCreate方法中调用的引用。
private long mode;
private final Button playBtn = (Button)findViewById(R.id.playBtn);
private final TextView aboutTitle = (TextView)findViewById(R.id.aboutTitle);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
playBtn.setTypeface(robotoThin);
aboutTitle.setText("hello world");
}
我知道要解决该错误，将在setContentView之后引用按钮和textview，但是问题是我需要为同一类中的每个方法重复所有引用。
最佳答案
// try this way (here i'm declare your both view object as globaly for your class so it can be acccess any where in classs and is created onCreate() at first time and further it used directly)
private long mode;
private Button playBtn;
private TextView aboutTitle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
playBtn = (Button)findViewById(R.id.playBtn);
aboutTitle = (TextView)findViewById(R.id.aboutTitle);
playBtn.setTypeface(robotoThin);
aboutTitle.setText("hello world");
}