package com.example.eiraj.listviewseefrgmentsfiirst;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView textView= (TextView) findViewById(R.id.textView);
public void show(View view){
textView.setVisibility(View.VISIBLE);
}
public void hide(View view){
textView.setVisibility(View.INVISIBLE);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
這裏兩個按鈕被用來顯示數據和隱藏數據,但每當我試圖運行模擬器顯示消息不幸uihide停止還我下載的APK運行它在我的手機,但同樣的信息在來到那裏機器人隱藏UI並顯示UI代碼不工作
參見:http://stackoverflow.com/questions/36446114/why-android-app-crashes-for-initializing-variable-with-findviewbyidr-id –