MainActivity
public class MainActivity extends AppCompatActivity {
// Button
private Button button;
// TextView
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ModelClass modelClass = new ModelClass();
modelClass.setTest("Sung Sikyung");
// TextView
textView = findViewById(R.id.textView);
textView.setText(modelClass.getTest());
// Button
button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getBaseContext(), SubActivity.class);
startActivity(intent);
}
});
}
}
I tried to set data in ModelClass, and get it to set TextView Text. but npe occurred. How can I call model class' data, and set it as a textView text?
CodePudding user response:
I have gone through your code, I hope your model class 'ModelClass' is as follows,
public class ModelClass {
public String test;
public ModelClass() {
}
public String getTest() {
return test;
}
public void setTest(String test) {
this.test = test;
}}
and your main activity is as follows,
public class MainActivity extends AppCompatActivity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ModelClass modelClass = new ModelClass();
modelClass.setTest("Sung Sikyung");
// TextView
textView = findViewById(R.id.textView);
textView.setText(modelClass.getTest());
}}
I haven't implemented the button but the code works just fine. Data from the model class is displayed in the textView. If you have any doubt, please add some more details to your question.
Thank you.