我想更改所选的背景颜色标签。我想要选择颜色背景我的选项卡上的绿色选中并将颜色背景未选中的选项卡更改为＃a8a8a8
但是当我在日志中滑动时，我看到了这一点：
Process: pl.smok, PID: 28410
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.drawable.Drawable.setColorFilter(int, android.graphics.PorterDuff$Mode)' on a null object reference
at pl..smok.ui.activity.MainActivity$2.onTabUnselected(MainActivity.java:163)
at android.support.design.widget.TabLayout.dispatchTabUnselected(TabLayout.java:1163)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1149)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1124)
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1419)
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1524)
at android.view.View$PerformClick.run(View.java:22526)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
这是完整的代码：
public class MainActivity extends AppCompatActivity {
@BindView(R.id.view_pager)
ViewPager viewPager;
@BindView(R.id.tab_layout)
TabLayout tabLayout;
ActionBar actionBar;
SharedPreferences sp;
SharedPreferences.Editor editor;
int choose;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sp = getSharedPreferences("pfref", Activity.MODE_PRIVATE);
editor = sp.edit();
choose = sp.getInt("screen", 1);
// String token = FirebaseInstanceId.getInstance().getToken();
// Log.e( "Token: ", token);
if(choose == 1 )
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
else
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
actionBar = getSupportActionBar();
hideActionBar();
String[] tabs = {"start", "status", "wiadomości", "nowa wiadomość"};
viewPager.setOffscreenPageLimit(4);
viewPager.setAdapter(new PageAdapter(getFragmentManager(), tabs));
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener(){
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
CommonUtil.hideKeyboard(MainActivity.this);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setupWithViewPager(viewPager);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(getResources().getColor(R.color.colorBrown));
}
getFragmentManager()
.beginTransaction()
.add(R.id.top_bar_container, new TopBarFragment(), TopBarFragment.class.getName())
.commit();
processIntent(getIntent());
createTabIcons();
setupTabIcons();
}
@Override
protected void onResume() {
super.onResume();
choose = sp.getInt("screen", 1);
if(choose == 1 )
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
else
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
private void setupTabIcons() {
// tabLayout.getTabAt(1).getIcon().setColorFilter(Color.parseColor("#a8a8a8"), PorterDuff.Mode.SRC_IN);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
// tab.getIcon().mutate().setColorFilter(Color.GREEN, PorterDuff.Mode.SRC_IN);
Log.e("tab count " , tab.getPosition() + " " );
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
// tab.getIcon().setColorFilter(Color.parseColor("#a8a8a8"), PorterDuff.Mode.SRC_IN);
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
@Override
protected void onStart() {
super.onStart();
App.getBus().register(this);
runServices();
}
@Override
protected void onStop() {
super.onStop();
App.getBus().unregister(this);
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
processIntent(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
protected void processIntent(Intent intent) {
if (intent != null && intent.getIntExtra(Const.KEY_GOTO, 0) == 1 && viewPager != null) {
viewPager.setCurrentItem(2);
}
}
@Subscribe
public void onPermissionRequestedEvent(PermissionRequestedEvent event) {
PermissionUtil.getPermission(this, event.getPermission());
}
@Subscribe
public void onPermissionGrantedEvent(PermissionGrantedEvent event) {
if (event.getPermission().equals(Manifest.permission.ACCESS_FINE_LOCATION)) {
runLocationService();
}
}
@Subscribe
public void onPageNavigateEvent(PageNavigateEvent event) {
Intent intent;
switch (event.getPage()) {
case Const.APP_SETTINGS_LOCATION:
CommonUtil.hideKeyboard(this);
intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
break;
case Const.PAGE_START:
viewPager.setCurrentItem(0);
break;
case Const.PAGE_STATUSES:
viewPager.setCurrentItem(1);
break;
case Const.PAGE_MESSAGES:
viewPager.setCurrentItem(2);
break;
case Const.PAGE_SEND_MESSAGE:
viewPager.setCurrentItem(3);
break;
default: break;
}
}
@Subscribe(sticky = true)
public void onLoggedOutEvent(LoggedOutEvent event) {
String user = Hawk.get(HawkConst.LOGIN_USER);
String company = Hawk.get(HawkConst.LOGIN_COMPANY);
String password = Hawk.get(HawkConst.LOGIN_PASSWORD);
Hawk.clear();
Hawk.put(HawkConst.LOGIN_USER, user);
Hawk.put(HawkConst.LOGIN_COMPANY, company);
Hawk.put(HawkConst.LOGIN_PASSWORD, password);
stopLocationService();
stopTrackerService();
stopConfigService();
FileUtil.clearDirs();
Intent intent = new Intent(MainActivity.this, StartActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
App.getBus().removeStickyEvent(LoggedOutEvent.class);
}
@Subscribe
public void onPhotoRequestedEvent(PhotoRequestedEvent event) {
Intent intent;
switch (event.getRequestCode()) {
case Const.PHOTO_GALLERY:
intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(Intent.createChooser(intent, getResources().getString(R.string.choose_image_title)), event.getRequestCode());
break;
case Const.PHOTO_CAMERA:
intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, FileUtil.getOutputTempUri("images"));
startActivityForResult(intent, event.getRequestCode());
break;
default: break;
}
}
@Subscribe
public void onFileViewRequestEvent(FileViewRequestEvent event) {
File file = FileUtil.getFile(event.getEvent().getId());
if (file == null) {
Toast.makeText(this, getResources().getString(R.string.file_not_exists), Toast.LENGTH_LONG).show();
} else {
Uri uri = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
try {
String type = FileUtil.getMimeType(file.getPath());
intent.setDataAndType(uri, type);
startActivity(intent);
App.getBus().post(new FileViewedEvent(event.getEvent()));
} catch (Exception e) {
e.printStackTrace();
try {
intent.setDataAndType(uri, "*/*");
startActivity(intent);
App.getBus().post(new FileViewedEvent(event.getEvent()));
} catch (Exception ee) {
ee.printStackTrace();
Toast.makeText(this, getResources().getString(R.string.no_file_app), Toast.LENGTH_LONG).show();
}
}
}
}
@Subscribe
public void onHideKeyboardEvent() {
CommonUtil.hideKeyboard(this);
}
@Subscribe
public void onMoveAppBackgroundEvent(MoveAppBackgroundEvent event) {
moveTaskToBack(true);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK) {
switch (requestCode) {
case Const.PHOTO_GALLERY:
App.getBus().postSticky(new PhotoSelectedEvent(data.getData())); break;
case Const.PHOTO_CAMERA:
Uri uri = FileUtil.renameFile(App.getConfigRepository().getPhotoMaxWidth());
App.getBus().postSticky(new PhotoSelectedEvent(uri)); break;
default: break;
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {
case Const.PERMISSIONS_REQUEST_LOCATION:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
App.getBus().post(new PermissionGrantedEvent(Manifest.permission.ACCESS_FINE_LOCATION));
}
break;
default:
break;
}
}
protected void runServices() {
if (LocationUtil.isLocationEnabled(getBaseContext())) {
if (checkPermission()) {
runLocationService();
}
} else {
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setMessage(getResources().getString(R.string.location_settings_disabled));
dialog.setPositiveButton(getString(R.string.go_to_location_settings), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
App.getBus().post(new PageNavigateEvent(Const.APP_SETTINGS_LOCATION));
}
});
dialog.setNegativeButton(getResources().getString(R.string.cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
finish();
}
});
dialog.show();
}
runTrackerService();
runConfigService();
}
protected void runLocationService() {
startService(new Intent(this, LocationService.class));
}
protected void stopLocationService() {
stopService(new Intent(this, LocationService.class));
}
protected void runTrackerService() {
startService(new Intent(this, TrackerService.class));
}
protected void stopTrackerService() {
stopService(new Intent(this, TrackerService.class));
}
protected void runConfigService() {
startService(new Intent(this, ConfigService.class));
}
protected void stopConfigService() {
stopService(new Intent(this, ConfigService.class));
}
protected boolean checkPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
App.getBus().post(new PermissionRequestedEvent(Manifest.permission.ACCESS_FINE_LOCATION));
return false;
}
return true;
}
protected void hideActionBar() {
if (actionBar != null) {
actionBar.hide();
}
}
private void createTabIcons(){
}
}
这是此活动的xml代码。 activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
tools:context="pl.eltegps.smokkomunikator.ui.activity.MainActivity">
<FrameLayout
android:id="@+id/top_bar_container"
android:layout_width="match_parent"
android:layout_height="70dp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/top_bar_container">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingTop="?attr/actionBarSize">
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_vertical_margin"
android:paddingRight="@dimen/activity_vertical_margin"
android:paddingTop="@dimen/activity_vertical_margin" />
</LinearLayout>
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="center_horizontal"
android:minHeight="?attr/actionBarSize"
android:paddingTop="@dimen/activity_vertical_margin"
app:tabGravity="center"
app:tabIndicatorColor="#fff"
app:tabMode="scrollable"
app:tabTextAppearance="@style/MyCustomTextAppearance" />
</RelativeLayout>
</RelativeLayout>
答案 0 :(得分：0)
您好，您可以在xml中设置此颜色，无需编写代码
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="35dp"
app:tabSelectedTextColor="@color/colorSplashBackground"
app:tabTextAppearance="@android:style/TextAppearance.Widget.TabWidget"
app:tabTextColor="@color/colorBottomLine">
</android.support.design.widget.TabLayout>
这将是标签布局的xml，你必须在行中传递颜色
app:tabSelectedTextColor="@color/colorSplashBackground"