在片段中使用seekbar android

我已將一個片段附加到一個活動。在片段中，我正在監聽對seekbar所做的更改，但「onProgressChanged」方法從未被訪問過。此外，當試圖修改同樣位於片段中的TextView變量時，它不會修改其值（TextView變量應顯示搜索欄的值。）在片段中使用seekbar android

這裏是我使用的代碼：

主要業務

public class NearbyActivity extends AppCompatActivity { 

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

    // add map fragment 
    NearbyFragment nearbyFragment = (NearbyFragment) getSupportFragmentManager().findFragmentById(R.id.nearby_fragment); 

    if (nearbyFragment == null) { 
     nearbyFragment = NearbyFragment.newInstance(); 
     getSupportFragmentManager() 
       .beginTransaction() 
       .add(R.id.container_bar, nearbyFragment) 
       .commit(); 
    } 
}

片段

public class NearbyFragment extends Fragment implements OnSeekBarChangeListener{ 
private TextView distance; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.fragment_nearby, container, false); 

    final SeekBar seekBar = (SeekBar) rootView.findViewById(R.id.seekBar); 

    distance = (TextView) rootView.findViewById(R.id.distance); 

    seekBar.setProgress(50); 
    distance.setText("ass"); 

    seekBar.setOnSeekBarChangeListener(this); 

    // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.fragment_nearby, container, false); 
} 

@Override 
public void onProgressChanged(SeekBar seekBar, int i, boolean b) { 
    distance.setText("" + i); 
} 

@Override 
public void onStartTrackingTouch(SeekBar seekBar) { 

} 

@Override 
public void onStopTrackingTouch(SeekBar seekBar) { 

}

片段XML

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <SeekBar 
     android:layout_width="241dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/seekBar" 
     android:layout_marginStart="60dp" 
     android:layout_marginEnd="60dp" /> 

    <TextView 
     android:text="0" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/distance" 
     android:gravity="center"/> 

</LinearLayout>

來源

2017-03-05 spoke

改變這一行

return inflater.inflate(R.layout.fragment_nearby, container, false);

到

return rootView;

在onCreateView

來源

2017-03-05 16:03:05

在片段中使用seekbar android

回答

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