[英]Dynamically set text in a TextView inside a Layout - Android
I have this layout, containing a single TextView
, but I would like to be able to change it's content (the text to be visualized) in a dynamic way, using java code. 我有这个布局,包含一个
TextView
,但我希望能够使用java代码以动态方式更改它的内容(要显示的文本)。
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/list_header"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical"
android:layout_alignParentTop="true"
android:layout_alignParentBottom="true"
android:textStyle="bold"
android:textSize="22dp"
android:textColor="#FFFFFF"
android:padding="10dp"
android:background="#336699"
/>
</LinearLayout>
As you can see I have not defined the android:text="blablabla"
cause it is not fixed at the point of the code in which I use it. 正如你所看到的,我没有定义
android:text="blablabla"
因为它没有修复我使用它的代码。
I would like some method such as: 我想要一些方法,如:
TextView headerValue = (TextView) findViewById(R.id.list_header);
headerValue.setText( "blablabla" );
but this won't work because I use this layout for defining the style of a header of the list, and these lines conflict with the following I need to use: 但这不起作用,因为我使用这种布局来定义列表标题的样式,这些行与我需要使用的以下内容冲突:
View header = (View)getLayoutInflater().inflate(R.layout.list_header_layout, null);
listView.addHeaderView(header);
Can you please help me fix this problem? 你能帮我解决这个问题吗?
LOGCAT: logcat的:
E/AndroidRuntime( 1468): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
E/AndroidRuntime( 1468): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
E/AndroidRuntime( 1468): at android.app.ActivityThread.access$600(ActivityThread.java:123)
E/AndroidRuntime( 1468): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
E/AndroidRuntime( 1468): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 1468): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 1468): at android.app.ActivityThread.main(ActivityThread.java:4424)
E/AndroidRuntime( 1468): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 1468): at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime( 1468): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
E/AndroidRuntime( 1468): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
E/AndroidRuntime( 1468): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 1468): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.DVA_HLUI/com.DVA_HLUI.DVA_HLUISuperviseActivity}: java.lang.NullPointerException
E/AndroidRuntime( 1468): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
E/AndroidRuntime( 1468): at android.app.ActivityThread.startActivityNow(ActivityThread.java:1797)
E/AndroidRuntime( 1468): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
E/AndroidRuntime( 1468): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
E/AndroidRuntime( 1468): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:682)
E/AndroidRuntime( 1468): at android.widget.TabHost.setCurrentTab(TabHost.java:346)
E/AndroidRuntime( 1468): at android.widget.TabHost.addTab(TabHost.java:236)
E/AndroidRuntime( 1468): at com.DVA_HLUI.DVA_HLUIActivity.onCreate(DVA_HLUIActivity.java:41)
E/AndroidRuntime( 1468): at android.app.Activity.performCreate(Activity.java:4465)
E/AndroidRuntime( 1468): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
E/AndroidRuntime( 1468): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
E/AndroidRuntime( 1468): ... 11 more
E/AndroidRuntime( 1468): Caused by: java.lang.NullPointerException
E/AndroidRuntime( 1468): at com.DVA_HLUI.DVA_HLUISuperviseActivity.onCreate(DVA_HLUISuperviseActivity.java:41)
E/AndroidRuntime( 1468): at android.app.Activity.performCreate(Activity.java:4465)
E/AndroidRuntime( 1468): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
E/AndroidRuntime( 1468): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
E/AndroidRuntime( 1468): ... 21 more
Activity Class: 活动类:
public class MyActivity extends ListActivity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.list_activity);
ListView listView = (ListView) findViewById(android.R.id.list);
listEntryClass listEntries[] = new listEntryClass[]
{
new listEntryClass( "bla", "bla"),
new listEntryClass( "bla", "bla" )
};
listEntryArrayAdapter adapter = new listEntryArrayAdapter(this, R.layout.list_entry_layout, listEntries);
TextView headerValue = (TextView) findViewById(R.id.list_header);
headerValue.setText( this.getString(R.string.headerSupervise) );
View header = (View)getLayoutInflater().inflate(R.layout.list_header_layout, null);
listView.addHeaderView(header);
listView.setAdapter(adapter);
}
TextView headerValue = (TextView) header.findViewById(R.id.list_header);
Should be referenced from header view. 应从标题视图引用。
So Change your code to follwing. 所以将代码更改为以下内容。
View header = (View)getLayoutInflater().inflate(R.layout.list_header_layout, null);
TextView headerValue = (TextView) header.findViewById(R.id.list_header);
headerValue.setText( this.getString(R.string.headerSupervise) );
listView.addHeaderView(header);
listView.setAdapter(adapter);
use 采用
View header = (View)getLayoutInflater().inflate(R.layout.list_header_layout, null);
TextView headerValue = (TextView)header . findViewById(R.id.list_header);
headerValue.setText( this.getString(R.string.headerSupervise) );
instead of 代替
TextView headerValue = (TextView) findViewById(R.id.list_header);
headerValue.setText( this.getString(R.string.headerSupervise) );
View header = (View)getLayoutInflater().inflate(R.layout.list_header_layout, null);
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