在android中为textview设置值
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Setting value to textview in android
提问by user3453575
How to assign a value to a textview?
如何为文本视图赋值？
<TextView
android:id="@+id/hName"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textSize="25sp"
android:text = "@string/hName"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
This is the structure of one of the views I am creating. Now I want to assign value which comes from the previous activity to hname .I am able to get it from the previous activity but I am not able to set it to the textview. When I use setText(), it shows null pointer exception. How can I assign value to that text field. Thanks in advance.
这是我正在创建的视图之一的结构。现在我想将来自上一个活动的值分配给 hname 。我可以从上一个活动中获取它，但我无法将其设置为 textview。当我使用 setText() 时，它显示空指针异常。如何为该文本字段赋值。提前致谢。
This is the corresponding java code.
这是对应的java代码。
Intent intent = getIntent();
String host_name = intent.getStringExtra(ConnectionsActivity.HOST_NAME);
TextView tvName = (TextView)findViewById(R.id.hName);
tvName.setText(host_name);
setContentView(R.layout.sharedfiles);
采纳答案by Pragnesh Ghoda シ
There is problem with your structure..
你的结构有问题。。
its giving you a null-pointer exception because it can't find text-view...
它给你一个空指针异常，因为它找不到文本视图......
put setContentView(R.layout.sharedfiles);above intent...
把setContentView(R.layout.sharedfiles);上面的意图...
try this..
尝试这个..
setContentView(R.layout.sharedfiles);
Intent intent = getIntent();
String host_name = intent.getStringExtra(ConnectionsActivity.HOST_NAME);
TextView tvName = (TextView)findViewById(R.id.hName);
tvName.setText(host_name);
回答by marshallino16
@string/hName is accesible everywhere in your application code by
@string/hName 在你的应用程序代码中随处可见
getString(R.string.hName);
The null exception comes from something else, you'd better to post your logcat.
空异常来自其他方面，您最好发布您的 logcat。
