<分区>
当我尝试对按钮使用 onClickListener 方法时，在任何 onCreate 或 onPause 或 onAnything 方法之外的变量，它不起作用。我什至无法在“onAnything”方法之外设置按钮变量的值。帮助会很棒。
谢谢!
public class StartingPoint extends Activity {
/** Called when the activity is first created. */
int counter;
Button add= (Button) findViewById(R.id.bAdd);
Button sub= (Button) findViewById(R.id.bSub);
TextView display= (TextView) findViewById(R.id.tvDisplay);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.i("phase", "on create");
counter=0;
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter++;
display.setText(""+counter);
display.setTextSize(counter);
Log.i("phase", "add");
}
});
sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter--;
display.setText(""+counter);
display.setTextSize(counter);
display.setTextColor(Color.GREEN);
Log.i("phase", "sub");
}
});
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.i("phase", "on start");
SharedPreferences prefs = getPreferences(0);
int getfromfile = prefs.getInt("counter_store", 1);
counter=getfromfile;
display.setText(""+getfromfile);
display.setTextSize(getfromfile);
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.i("phase", "on stop");
SharedPreferences.Editor editor = getPreferences(0).edit();
editor.putInt("counter_store", counter);
editor.commit();
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
counter=0;
Log.i("phase", "on destroy");
}
}