如何改变 inflate viewgroup的子代？

Question

我想改变膨胀的子视图组pi不知道如何访问widget。

public class MainActivity extends AppCompatActivity {
ScrollView activitymain;
LinearLayout rootLayout, subInfo;
TextView tvSerName, tvSerPrice, tvStarDate, tvNextDate;
CreateSubActivity createSubActivity;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    rootLayout = (LinearLayout) findViewById(R.id.root);
    subInfo = (LinearLayout) findViewById(R.id.subinfo);
    activitymain = (ScrollView) findViewById(R.id.activity_main);
    tvSerName = (TextView) findViewById(R.id.tvSerName);   //these are child of subinfo
    tvSerPrice = (TextView) findViewById(R.id.tvSerPrice);
    tvStarDate = (TextView) findViewById(R.id.tvStarDate);
    tvNextDate = (TextView) findViewById(R.id.tvNextDate);

}

当在另一个活动中的按钮被按下时，这个方法就会起作用。当视图被添加时，我想通过setText()来改变tvSerName, tvSerPrice, tvStarDate, tvNextDate的文本，但它不起作用。

void addView() {
    createSubActivity = new CreateSubActivity();

    LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    ViewGroup addview = (ViewGroup) inflater.inflate(R.layout.subinfo, null);
    tvSerName.setText("name"); // it does not works

    rootLayout.addView(addview);
}

Answer 1

你试图设置文本的视图还没有在viewGroup中设置。

你仍然需要在视图组中设置 tvSerName = addview.findVieById(R.id.tvSerName); 在其上设置文字之前。

void addView() {
    createSubActivity = new CreateSubActivity();

    LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    ViewGroup addview = (ViewGroup) inflater.inflate(R.layout.subinfo, null);

    //here
    tvSerName = addview.findVieById(R.id.tvSerName);

    //then set its text
    tvSerName.setText("name"); // it does not works

    rootLayout.addView(addview);
}