在使用我的Android应用程序时，我发现导航抽屉在打开和关闭时都会挂起。它挂了2-3秒。在大多数设备上，它都很好（主要是使用Stock Android），但在某些设备上，它会挂起（主要是三星）。
Home.java（实现抽屉的活动）：
public class Home extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener{
Fragment fragment;
public void MsgBox(String title, String msg,int id){
new LovelyInfoDialog(this)
.setTopColorRes(R.color.primary)
.setIcon(R.drawable.ic_info_white_24dp)
//This will add Don't show again checkbox to the dialog. You can pass any ID as argument
.setNotShowAgainOptionEnabled(id)
.setTitle(title)
.setMessage(msg)
.show();
}
public boolean showAds() {
SharedPreferences getPrefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
boolean showAd = getPrefs.getBoolean("showAd", true);
return showAd;
}
public static boolean hasPermissions(Context context, String... permissions) {
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
for (String permission : permissions) {
if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
return false;
}
}
}
return true;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
hasPermissions(this,Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.GET_ACCOUNTS);
int PERMISSION_ALL = 1;
String[] PERMISSIONS = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.GET_ACCOUNTS};
if(!hasPermissions(this, PERMISSIONS)){
ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_ALL);
}
AppRate.with(this)
.setInstallDays(5) // default 10, 0 means install day.
.setLaunchTimes(10) // default 10
.setRemindInterval(2) // default 1
.setShowLaterButton(true) // default true
.setDebug(false) // default false
.monitor();
AppRate.showRateDialogIfMeetsConditions(this);
final NavigationView navigationView = (NavigationView) findViewById(nav_view);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
navigationView.getMenu().getItem(1).setChecked(true);
onNavigationItemSelected(navigationView.getMenu().getItem(1));
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
navigationView.setNavigationItemSelectedListener(this);
fragment=new QuestionPap();
if (fragment != null) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment, "Home");
ft.commit();
}
}
boolean doubleBackToExitPressedOnce = false;
boolean drawe=false;
void Back(){
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
return;
}
this.doubleBackToExitPressedOnce = true;
this.drawe=true;
Toast.makeText(this, "Please click BACK again to exit", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doubleBackToExitPressedOnce=false;
drawe=true;
}
}, 2000);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (!drawe) {
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
if (fragment == getSupportFragmentManager().findFragmentByTag("Home")) {
super.onBackPressed();
} else {
drawer.openDrawer(GravityCompat.START);
Back();
}
}
}else{
super.onBackPressed();
}
}
@Override
protected void onDestroy(){
super.onDestroy();
Intent i = new Intent(this,DownloadService.class);
stopService(i);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
try {
int id = item.getItemId();
// fragment = null;
String TAG=null;
AppBarLayout appbar = (AppBarLayout)findViewById(R.id.appbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
if (id == R.id.home && fragment!=getSupportFragmentManager().findFragmentByTag("Home")) {
TAG="Home";
fragment = new QuestionPap();
fab.setVisibility(View.VISIBLE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {
appbar.setTranslationZ(0);
}
} else if (id == R.id.offline && fragment!=getSupportFragmentManager().findFragmentByTag("Offline")) {
TAG="Offline";
MsgBox("Save Files Offline","Tap and hold any file to delete it.",2);
fragment = new offline();
fab.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {
appbar.setTranslationZ(6*2);
}
} else if (id == R.id.syll && fragment!=getSupportFragmentManager().findFragmentByTag("Syllabus")) {
TAG="Syllabus";
fragment = new Syllabus();
fab.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {
appbar.setTranslationZ(0);
}
} else if (id == R.id.Tools && fragment!=getSupportFragmentManager().findFragmentByTag("Tools")) {
TAG="Tools";
fragment = new Tools();
fab.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {
appbar.setTranslationZ(6*2);
}
} else if (id == R.id.contribute && fragment!=getSupportFragmentManager().findFragmentByTag("Contribute")) {
TAG="Contribute";
fragment = new contribute();
fab.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {
appbar.setTranslationZ(6*2);
}
} else if (id == R.id.about && fragment!=getSupportFragmentManager().findFragmentByTag("About")) {
TAG="About";
fragment = new about();
fab.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {
appbar.setTranslationZ(6*2);
}
} else if (id==R.id.notices && fragment!=getSupportFragmentManager().findFragmentByTag("Notices")) {
TAG="Notices";
fragment = new notices();
fab.setVisibility(View.GONE);
MsgBox("Get Latest News", "Don't miss out on any department news.",3);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ) {
appbar.setTranslationZ(6*2);
}
} else if (id==R.id.donate && fragment!=getSupportFragmentManager().findFragmentByTag("Donate")) {
TAG="Donate";
fragment = new donate();
fab.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
appbar.setTranslationZ(6 * 2);
}
} else if (id==R.id.assig && fragment!=getSupportFragmentManager().findFragmentByTag("Assignments")) {
TAG = "Assignments";
fragment = new assignments();
fab.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
appbar.setTranslationZ(6 * 2);
}
}
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
if (fragment != null ) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment,TAG);
ft.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
catch (Exception ex){
}
return true;
}
}
我不知道背后的原因是什么。每当我试图打开它时，它就会挂起。每当我通过单击一个选项打开一个片段时，它就会挂起（我不认为它与片段的加载有关，因为抽屉在没有片段加载时打开时会挂起）。如果需要任何其他代码，我已准备好显示它。
答案 0 :(得分：0)
我通过降低Navigation Drawer标题图像的图像分辨率来解决了这个问题。它是1600 * 1200，我将分辨率更改为400 * 300。完成此操作后，抽屉在受影响的手机上平稳打开。
这不是我的编码错误，但它可能是定制ROM的问题，他们如何处理高分辨率的图像，因为抽屉已经在Stock Android上顺利打开。