我只想将值从一个活动传递到另一个活动,但无法从视图中找到Textview值。我只是通过文本框将一条消息从主活动传递到此活动,我看到了文本框值这里但不能将其分配给textView ...
这是我的代码..
public class DisplayMessageActivity extends Activity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
textView = (TextView) findViewById(R.id.displayText);
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
textView.setText(message);
}
XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.activityapps.DisplayMessageActivity$PlaceholderFragment" >
<TextView
android:id="@+id/displayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="TextView" />
请帮帮我..
答案 0 :(得分:2)
TextView
不属于“活动”布局。将TextView
的初始化移至onCreateView
的{{1}}。
PlaceholderFragment
活动
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_display_message, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.displayText);
return rootView;
}
然后
if (savedInstanceState == null) {
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
Bundle bundle = new Bundle();
bundle.putString("key", message);
PlaceholderFragment fragobj = new PlaceholderFragment();
fragobj.setArguments(bundle);
getFragmentManager().beginTransaction()
.add(R.id.container, fragobj).commit();
}
答案 1 :(得分:0)
View view = inflater.inflate(R.layout.fragment_display_message, container, false);
TextView textView = (TextView) view.findViewById(R.id.displayText);
return view; //in onCreate method
您已经从可以使用的活动中扩展了
TextView textView = (TextView) findViewById(R.id.displayText);
//in onCreate method