는 참조 텍스트 뷰을받지 못하고 있습니까 널 포인터 예외를 받고 텍스트 뷰 할 수있는 값을 설정할 때, 을 컨텍스트에서 작업을 비동기 호출하지만 때 내 비동기 작업이 잘 작동
제발 ... ... 어떻게 문맥 클래스에서 비동기 작업을 호출 참조를 얻을하는 데 도움이
05-14 11:44:45.279: E/AndroidRuntime(18314): FATAL EXCEPTION: main
05-14 11:44:45.279: E/AndroidRuntime(18314): Process: com.example.asynctest, PID: 18314
05-14 11:44:45.279: E/AndroidRuntime(18314): java.lang.NullPointerException
05-14 11:44:45.279: E/AndroidRuntime(18314): at com.example.asynctest.MainActivity$MyAsync.onPostExecute(MainActivity.java:50)
05-14 11:44:45.279: E/AndroidRuntime(18314): at com.example.asynctest.MainActivity$MyAsync.onPostExecute(MainActivity.java:1)
05-14 11:44:45.279: E/AndroidRuntime(18314): at android.os.AsyncTask.finish(AsyncTask.java:632)
05-14 11:44:45.279: E/AndroidRuntime(18314): at android.os.AsyncTask.access$600(AsyncTask.java:177)
05-14 11:44:45.279: E/AndroidRuntime(18314): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
05-14 11:44:45.279: E/AndroidRuntime(18314): at android.os.Handler.dispatchMessage(Handler.java:102)
05-14 11:44:45.279: E/AndroidRuntime(18314): at android.os.Looper.loop(Looper.java:136)
05-14 11:44:45.279: E/AndroidRuntime(18314): at android.app.ActivityThread.main(ActivityThread.java:5102)
05-14 11:44:45.279: E/AndroidRuntime(18314): at java.lang.reflect.Method.invokeNative(Native Method)
05-14 11:44:45.279: E/AndroidRuntime(18314): at java.lang.reflect.Method.invoke(Method.java:515)
05-14 11:44:45.279: E/AndroidRuntime(18314): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
05-14 11:44:45.279: E/AndroidRuntime(18314): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
05-14 11:44:45.279: E/AndroidRuntime(18314): at dalvik.system.NativeStart.main(Native Method)
MainClass.java
public class MainActivity extends Activity {
TextView textView;
String textctx;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=(TextView) findViewById(R.id.textView1);
textView.setText("Main class Text");
MyContextClass contextClass=new MyContextClass(this);
contextClass.MyContextMethod();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void callfromcontext(String contexttext) {
new MyAsync().execute(contexttext);
}
class MyAsync extends AsyncTask<String, String, String>
{
@Override
protected String doInBackground(String... params) {
String sometext=params[0];
return sometext;
}
@Override
protected void onPostExecute(String result) {
System.out.println("result"+result);
textView.setText(result);
}
}
}
M
public class MyContextClass {
Context context;
public MyContextClass(Context ctx)
{
this.context=ctx;
MainActivity activity=new MainActivity();
String contexttext="Context Class Text";
activity.callfromcontext(contexttext);
}
public void MyContextMethod()
{
}
}
yContextClass.java
는
관련 코드를 게시하십시오. – Leandros
'NovvTrend' 클래스를 게시하십시오. – rogcg
안녕하세요, 내 샘플 코드 –