我修改了我的MainActivity代码，在应用启动时打开导航抽屉。但是这个尝试没有用，我撤消了所有的更改。运行app时我得到错误。如何解决这个错误？还可以帮我在应用程序启动时打开导航抽屉。
这是我用于此目的的代码
static final int DRAWER_DELAY = 200;
@Override
protected void onCreate(Bundle savedInstanceState) {
...
// Building NavDrawer logic here. Just a method call would be best.
...
new Handler().postDelayed(openDrawerRunnable(), DRAWER_DELAY);
}
private Runnable openDrawerRunnable() {
return new Runnable() {
@Override
public void run() {
drawerLayout.openDrawer(Gravity.LEFT);
}
}
}
这是我的MainActivity代码
package com.example.mohammedalukkal.ktucses4;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.widget.CardView;
import android.text.Layout;
import android.text.style.BackgroundColorSpan;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.app.FragmentTransaction;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private static long time;
FloatingActionButton fab,fab_univer,fab_drive,fab_web;
TextView university,ktuweb,drive;
Animation Fabopen,Fabclose,Fabclockwise,Fabanticlockwise,dimon,dimoff;
FragmentTransaction fragmentTransaction;
boolean isopen = false;
ImageView dim;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
fab = (FloatingActionButton) findViewById(R.id.fab);
university = (TextView) findViewById(R.id.university);
ktuweb = (TextView) findViewById(R.id.ktuweb);
drive = (TextView) findViewById(R.id.drive);
fab_drive = (FloatingActionButton) findViewById(R.id.fab_drive);
fab_web = (FloatingActionButton) findViewById(R.id.fab_web);
fab_univer = (FloatingActionButton) findViewById(R.id.fab_univer);
Fabopen = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fab_open);
Fabclose = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fab_close);
Fabclockwise = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.rotate_clockwise);
Fabanticlockwise = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.rotate_anticlockwise);
dim = (ImageView) findViewById(R.id.dim);
dimon = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.dim_on);
dimoff = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.dim_off);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (isopen) {
university.startAnimation(Fabclose);
ktuweb.startAnimation(Fabclose);
drive.startAnimation(Fabclose);
fab.startAnimation(Fabanticlockwise);
fab_univer.startAnimation(Fabclose);
fab_web.startAnimation(Fabclose);
fab_drive.startAnimation(Fabclose);
dim.startAnimation(dimoff);
dim.setClickable(false);
fab_web.setClickable(false);
fab_univer.setClickable(false);
fab_drive.setClickable(false);
isopen = false;
} else {
university.startAnimation(Fabopen);
ktuweb.startAnimation(Fabopen);
drive.startAnimation(Fabopen);
fab.startAnimation(Fabclockwise);
fab_univer.startAnimation(Fabopen);
fab_web.startAnimation(Fabopen);
fab_drive.startAnimation(Fabopen);
dim.startAnimation(dimon);
dim.setClickable(true);
fab_web.setClickable(true);
fab_univer.setClickable(true);
fab_drive.setClickable(true);
isopen = true;
}
}
});
fab_univer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(getApplicationContext(),University.class));
if (isopen)
{
university.startAnimation(Fabclose);
ktuweb.startAnimation(Fabclose);
drive.startAnimation(Fabclose);
fab.startAnimation(Fabanticlockwise);
fab_univer.startAnimation(Fabclose);
fab_web.startAnimation(Fabclose);
fab_drive.startAnimation(Fabclose);
dim.startAnimation(dimoff);
dim.setClickable(false);
fab_web.setClickable(false);
fab_univer.setClickable(false);
fab_drive.setClickable(false);
isopen = false;
}
}
});
fab_web.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(getApplicationContext(),Ktuweb.class));
if (isopen)
{
university.startAnimation(Fabclose);
ktuweb.startAnimation(Fabclose);
drive.startAnimation(Fabclose);
fab.startAnimation(Fabanticlockwise);
fab_univer.startAnimation(Fabclose);
fab_web.startAnimation(Fabclose);
fab_drive.startAnimation(Fabclose);
dim.startAnimation(dimoff);
dim.setClickable(false);
fab_web.setClickable(false);
fab_univer.setClickable(false);
fab_drive.setClickable(false);
isopen = false;
}
}
});
fab_drive.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(getApplicationContext(),Drive.class));
if (isopen)
{
university.startAnimation(Fabclose);
ktuweb.startAnimation(Fabclose);
drive.startAnimation(Fabclose);
fab.startAnimation(Fabanticlockwise);
fab_univer.startAnimation(Fabclose);
fab_web.startAnimation(Fabclose);
fab_drive.startAnimation(Fabclose);
dim.startAnimation(dimoff);
dim.setClickable(false);
fab_web.setClickable(false);
fab_univer.setClickable(false);
fab_drive.setClickable(false);
isopen = false;
}
}
});
final 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 navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
dim.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (isopen)
{
university.startAnimation(Fabclose);
ktuweb.startAnimation(Fabclose);
drive.startAnimation(Fabclose);
fab.startAnimation(Fabanticlockwise);
fab_univer.startAnimation(Fabclose);
fab_web.startAnimation(Fabclose);
fab_drive.startAnimation(Fabclose);
dim.startAnimation(dimoff);
dim.setClickable(false);
fab_web.setClickable(false);
fab_univer.setClickable(false);
fab_drive.setClickable(false);
isopen = false;
}
}
});
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
}
else if (isopen) {
university.startAnimation(Fabclose);
ktuweb.startAnimation(Fabclose);
drive.startAnimation(Fabclose);
fab.startAnimation(Fabanticlockwise);
fab_univer.startAnimation(Fabclose);
fab_web.startAnimation(Fabclose);
fab_drive.startAnimation(Fabclose);
dim.startAnimation(dimoff);
dim.setClickable(false);
fab_web.setClickable(false);
fab_univer.setClickable(false);
fab_drive.setClickable(false);
isopen = false;
}
else {
if (time + 2000 > System.currentTimeMillis()) {
super.onBackPressed();
} else {
Toast.makeText(MainActivity.this, "Press back again to exit", Toast.LENGTH_SHORT).show();
}
time = System.currentTimeMillis();
}
}
@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;
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view model clicks here.
int id = item.getItemId();
if (id == R.id.sub_1) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new ma202Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("MA202");
getSupportActionBar().setSubtitle("Probability distributions,Transforms and Numerical Methods");
} else if (id == R.id.sub_2) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new cs202Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("CS202");
getSupportActionBar().setSubtitle("Computer Organization and Architecture");
} else if (id == R.id.sub_3) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new cs204Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("CS204");
getSupportActionBar().setSubtitle("Operating Systems");
} else if (id == R.id.sub_4) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new cs206Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("CS206");
getSupportActionBar().setSubtitle("Object Oriented Design and Programming");
} else if (id == R.id.sub_5) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new cs208Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("CS208");
getSupportActionBar().setSubtitle("Principles of data base design");
} else if (id == R.id.sub_6) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new hs200Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("HS200");
getSupportActionBar().setSubtitle("Buisness Economics");
} else if (id == R.id.sub_7) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new hs210Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("HS210");
getSupportActionBar().setSubtitle("Life Skills");
} else if (id == R.id.lab_1) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new cs232Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("CS232");
getSupportActionBar().setSubtitle("Free and open system software lab");
} else if (id == R.id.lab_2) {
fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,new cs234Fragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("CS234");
getSupportActionBar().setSubtitle("Digital systems lab");
} else if (id == R.id.nav_about) {
startActivity(new Intent(getApplicationContext(),About.class));
} else if (id == R.id.nav_share) {
Intent myIntent = new Intent(Intent.ACTION_SEND);
myIntent.setType("text/plain");
String shareBody = "KTU CSE S4 app download from the given link : link (use chrome browser)";
String shareSub = "Download KTU CSE S4 app";
myIntent.putExtra(Intent.EXTRA_SUBJECT,shareSub);
myIntent.putExtra(Intent.EXTRA_TEXT,shareBody);
startActivity(Intent.createChooser(myIntent, "Share KTU CSE S4 app via"));
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
if (isopen)
{
university.startAnimation(Fabclose);
ktuweb.startAnimation(Fabclose);
drive.startAnimation(Fabclose);
fab.startAnimation(Fabanticlockwise);
fab_univer.startAnimation(Fabclose);
fab_web.startAnimation(Fabclose);
fab_drive.startAnimation(Fabclose);
dim.startAnimation(dimoff);
dim.setClickable(false);
fab_web.setClickable(false);
fab_univer.setClickable(false);
fab_drive.setClickable(false);
isopen = false;
}
return true;
}
}
答案 0 :(得分：0)
@Override
protected void onCreate(Bundle savedInstanceState) {
// your other code...
// setContentView(...) initialize drawer and stuff like that...
// use thread for performance
Thread t = new Thread(new Runnable() {
@Override
public void run() {
SharedPreferences sp = Context.getSharedPreferences("yoursharedprefs", 0);
boolean isFirstStart = sp.getBoolean("key", true);
// we will not get a value at first start, so true will be returned
// if it was the first app start
if(isFirstStart) {
mDrawerLayout.openDrawer(mDrawerList);
Editor e = sp.edit();
// we save the value "false", indicating that it is no longer the first appstart
e.putBoolean("key", false);
e.commit();
}
}
});
t.start();
}