我编写了一个测验应用程序。那里还有一个导航抽屉，其中包含以下项目：主页，统计信息和关于。第一个活动/主要活动（quizActivity）具有主页项，第二个活动（menu2）具有统计项。 Menu3中有关于项。现在，我已经通过单击项目首页-> QuizActivity打开，在导航抽屉的Menu2中对其进行了设置。现在我还想，当我单击“关于”按钮时，将打开Menu3。但是，除了Menu3之外，我在打开自己之前使用的我最近使用的应用程序/它会打开该应用程序的最新页面，例如测验活动。我怎么了我也检查了其他类似的线程，但找不到帮助。
Menu2 Java：
public class Menu2 extends AppCompatActivity {
private DrawerLayout mDrawerLayout2;
private ActionBarDrawerToggle mToggle;
private Toolbar mToolbar;
private Button popup;
private Button popup2;
private Button popup3;
private PopupWindow popupWindow;private LayoutInflater layoutInflater; //Alows to add a new layout in our window
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu2);
TextView txtScore = (TextView) findViewById(R.id.textScore2);
TextView txtHighScore = (TextView) findViewById(R.id.textHighScore);
ImageView imgTrophyView1 = (ImageView) findViewById(R.id.trophy1);
ImageView imgTrophyView2 = (ImageView) findViewById(R.id.trophy2);
Button bttPOPUP = (Button) findViewById(R.id.enablePOPUP);
Button bttPOPUP2 =(Button)findViewById(R.id.enablePOPUP2);
Button bttPOPUP3 = (Button) findViewById(R.id.enablePOPUP3);
ImageView imgTrophyView3=(ImageView)findViewById(R.id.trophy3);
Intent intent = getIntent();
int mScore = intent.getIntExtra("score", 0);
txtScore.setText("Your score is: " + mScore);
SharedPreferences mypref = getPreferences(MODE_PRIVATE);
int highScore = mypref.getInt("highScore", 0);
if (highScore >= mScore){
txtHighScore.setText("High score: " + highScore);
if (highScore >= 10) {
imgTrophyView1.setVisibility(View.VISIBLE);
bttPOPUP.setVisibility(View.VISIBLE);
}
if (highScore >= 20) {
imgTrophyView2.setVisibility(View.VISIBLE);
bttPOPUP2.setVisibility(View.VISIBLE);
}
if (highScore >= 30) {
imgTrophyView3.setVisibility(View.VISIBLE);
bttPOPUP3.setVisibility(View.VISIBLE);
}
}
else {
txtHighScore.setText("New highscore: " + mScore);
SharedPreferences.Editor editor = mypref.edit();
editor.putInt("highScore", mScore);
editor.commit();
}
//Start POPUP window 1
popup = (Button)findViewById(R.id.enablePOPUP);
popup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
layoutInflater =(LayoutInflater) getApplicationContext().getSystemService(LAYOUT_INFLATER_SERVICE);
ViewGroup container = (ViewGroup)layoutInflater.inflate(R.layout.popup_menu2_1,null);
popupWindow = new PopupWindow(container,1000,980,true); //400,400=popUp size, true = makes that we can close the pop up by simply click out of the window
popupWindow.showAtLocation(mDrawerLayout2, Gravity.CENTER, 0, 0);
mDrawerLayout2.setAlpha((float) 0.3);
container.setOnTouchListener(new View.OnTouchListener(){
@Override
public boolean onTouch(View view, MotionEvent motionEvent ){
mDrawerLayout2.setAlpha((float) 1);
popupWindow.dismiss();
return true;
}
});
popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
@Override
public void onDismiss() {
mDrawerLayout2.setAlpha((float) 1);
popupWindow.dismiss();
}
});
}
});
//End POPUP window 1
//start POPUP window 2
popup2 = (Button)findViewById(R.id.enablePOPUP2);
popup2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
layoutInflater =(LayoutInflater) getApplicationContext().getSystemService(LAYOUT_INFLATER_SERVICE);
ViewGroup container = (ViewGroup)layoutInflater.inflate(R.layout.popup_menu2_2,null);
popupWindow = new PopupWindow(container,1000,980,true); //400,400=popUp size, true = makes that we can close the pop up by simply click out of the window
popupWindow.showAtLocation(mDrawerLayout2, Gravity.CENTER, 0, 0);
mDrawerLayout2.setAlpha((float) 0.3);
container.setOnTouchListener(new View.OnTouchListener(){
@Override
public boolean onTouch(View view, MotionEvent motionEvent ){
mDrawerLayout2.setAlpha((float) 1);
popupWindow.dismiss();
return true;
}
});
popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
@Override
public void onDismiss() {
mDrawerLayout2.setAlpha((float) 1);
popupWindow.dismiss();
}
});
}
});
//End POPUP window 2
//start POPUP window 3
popup3 = (Button)findViewById(R.id.enablePOPUP3);
popup3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
layoutInflater =(LayoutInflater) getApplicationContext().getSystemService(LAYOUT_INFLATER_SERVICE);
ViewGroup container = (ViewGroup)layoutInflater.inflate(R.layout.popup_menu2_3,null);
popupWindow = new PopupWindow(container,1000,980,true); //400,400=popUp size, true = makes that we can close the pop up by simply click out of the window
popupWindow.showAtLocation(mDrawerLayout2, Gravity.CENTER, 0, 0);
mDrawerLayout2.setAlpha((float) 0.3);
container.setOnTouchListener(new View.OnTouchListener(){
@Override
public boolean onTouch(View view, MotionEvent motionEvent ){
mDrawerLayout2.setAlpha((float) 1);
popupWindow.dismiss();
return true;
}
});
popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
@Override
public void onDismiss() {
mDrawerLayout2.setAlpha((float) 1);
popupWindow.dismiss();
}
});
}
});
//End POPUP window 3
mToolbar = (Toolbar)findViewById(R.id.nav_action);
setSupportActionBar(mToolbar);
mDrawerLayout2 = (DrawerLayout) findViewById(R.id.drawerLayout2);
mToggle = new ActionBarDrawerToggle(this, mDrawerLayout2, R.string.open, R.string.close);
mDrawerLayout2.addDrawerListener(mToggle);
mToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
NavigationView mNavigationView = (NavigationView) findViewById(nv2);
mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
int id = menuItem.getItemId();
Intent i;
if (id == R.id.nav_home2) {
// Handle the home action
i = new Intent(Menu2.this, QuizActivity.class);
startActivity(i);
} else if (id == R.id.nav_about2) {
i = new Intent(Menu2.this, Menu3.class);
startActivity(i);
}
return true;
}
});
}
@Override //Makes that the "Burger" Item, shows the Drawer if someone clicks on the simbol
public boolean onOptionsItemSelected(MenuItem item) {
if (mToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
导航菜单：
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/nav_home2"
android:title="Home"
android:icon="@mipmap/ic_home_black_24dp"/>
<item android:id="@+id/nav_stats2"
android:title="Stats"
android:icon="@mipmap/ic_person_black_24dp"
android:checked="true"/>
<item android:id="@+id/nav_about2"
android:title="About"
android:icon="@mipmap/ic_info_outline_black_24dp"/>
</menu>
菜单2 XML：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
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"
tools:context="amapps.impossiblequiz.Menu2"
android:id="@+id/drawerLayout2"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
layout="@layout/navigation_action"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent">
<TextView
android:id="@+id/textScore2"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:background="#f60"
android:paddingTop="10dp"
android:paddingLeft="35dp"
android:text="Your score is:"
android:textAppearance="@style/TextAppearance.AppCompat"
android:textColor="#ffffff"
android:textSize="20dp"
android:layout_marginTop="28dp"
android:layout_below="@+id/textView2"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<TextView
android:id="@+id/textHighScore"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:background="#FFAB00"
android:paddingLeft="35dp"
android:paddingRight="100dp"
android:paddingTop="10dp"
android:text="Highest score:"
android:textAppearance="@style/TextAppearance.AppCompat"
android:textColor="#ffffff"
android:textSize="20dp"
android:layout_marginTop="13dp"
android:layout_below="@+id/textScore2"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
android:id="@+id/tryAgain_button"
android:layout_width="150dp"
android:layout_height="50dp"
android:background="@drawable/bg_pill"
android:onClick="onClick"
android:text="Restart Quiz!"
android:textColor="#ffffff"
android:layout_marginTop="18dp"
android:layout_below="@+id/textHighScore"
android:layout_centerHorizontal="true" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="33dp"
android:text="Stats: play and get trophies!"
android:textAppearance="@style/TextAppearance.AppCompat.Button"
android:textSize="20dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<ImageView
android:id="@+id/statsTrophy"
app:srcCompat="@drawable/statsoftrophy"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignTop="@+id/textHighScore"
android:layout_above="@+id/tryAgain_button"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<ImageView
android:id="@+id/trophy1"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/tryAgain_button"
android:layout_marginLeft="26dp"
android:layout_marginStart="26dp"
android:layout_marginTop="70dp"
android:visibility="invisible"
app:srcCompat="@drawable/trophy1" />
<ImageView
android:id="@+id/trophy2"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_alignTop="@+id/trophy1"
android:layout_marginLeft="24dp"
android:layout_marginStart="24dp"
android:layout_toEndOf="@+id/trophy1"
android:layout_toRightOf="@+id/trophy1"
android:visibility="invisible"
app:srcCompat="@drawable/trophy2" />
<Button
android:id="@+id/enablePOPUP"
android:layout_width="80dp"
android:layout_height="30dp"
android:text="Info"
android:alpha="0.30"
android:visibility="invisible"
android:background="@drawable/bg_pill_trophy"
android:textColor="#ffffff"
android:layout_alignTop="@+id/enablePOPUP2"
android:layout_alignLeft="@+id/trophy1"
android:layout_alignStart="@+id/trophy1" />
<Button
android:id="@+id/enablePOPUP2"
android:layout_width="60dp"
android:layout_height="30dp"
android:background="@drawable/bg_pill_trophy"
android:text="Info"
android:textColor="#ffffff"
android:alpha="0.30"
android:visibility="invisible"
android:layout_marginTop="12dp"
android:layout_below="@+id/trophy2"
android:layout_alignLeft="@+id/trophy2"
android:layout_alignStart="@+id/trophy2"
android:layout_alignRight="@+id/trophy2"
android:layout_alignEnd="@+id/trophy2" />
<ImageView
android:id="@+id/trophy3"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_alignTop="@+id/trophy2"
android:layout_toLeftOf="@+id/statsTrophy"
android:layout_toStartOf="@+id/statsTrophy"
app:srcCompat="@drawable/trophy3"
android:visibility="invisible"/>
<Button
android:id="@+id/enablePOPUP3"
android:layout_width="60dp"
android:layout_height="30dp"
android:background="@drawable/bg_pill_trophy"
android:text="Info"
android:textColor="#ffffff"
android:alpha="0.30"
android:visibility="invisible"
android:layout_alignBottom="@+id/enablePOPUP2"
android:layout_alignLeft="@+id/trophy3"
android:layout_alignStart="@+id/trophy3"
android:layout_alignTop="@+id/enablePOPUP2"
android:layout_alignRight="@+id/trophy3"
android:layout_alignEnd="@+id/trophy3" />
</RelativeLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:menu="@menu/navigation_menu2"
android:layout_gravity="start"
android:id="@+id/nv2"
app:headerLayout="@layout/navigation_header"
app:itemIconTint="@drawable/tint_color_selector2">
</android.support.design.widget.NavigationView>
Menu3 Java：
public class Menu3 extends AppCompatActivity {
private DrawerLayout mDrawerLayout3;
private ActionBarDrawerToggle mToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu3);
Toolbar mToolbar = (Toolbar) findViewById(R.id.nav_action);
setSupportActionBar(mToolbar);
mDrawerLayout3 = (DrawerLayout) findViewById(R.id.drawerLayout);
mToggle = new ActionBarDrawerToggle(this, mDrawerLayout3, R.string.open,
R.string.close);
mDrawerLayout3.addDrawerListener(mToggle);
mToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
NavigationView mNavigationView = (NavigationView) findViewById(nv3);
mNavigationView.setNavigationItemSelectedListener(new
NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem){
switch (menuItem.getItemId()){
case(R.id.nav_home3):
Intent accountActivity3 = new
Intent(getApplicationContext(),QuizActivity.class);
startActivity(accountActivity3);
}
return true;
}
});}
public void onClick(View view) {
Intent intent = new Intent(Menu3.this, QuizActivity.class);
startActivity(intent);
}
@Override //Makes that the "Burger" Item, shows the Drawer if someone clicks on the simbol
public boolean onOptionsItemSelected(MenuItem item) {
if (mToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Menu3 XML：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
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"
tools:context="amapps.impossiblequiz.Menu3"
android:id="@+id/drawerLayout3">
<android.support.design.widget.NavigationView
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:menu="@menu/navigation_menu3"
android:layout_gravity="start"
android:id="@+id/nv3"
app:headerLayout="@layout/navigation_header"
app:itemIconTint="@drawable/tint_color_selector2">
</android.support.design.widget.NavigationView>
最佳答案
尝试将onNavigationItemSelected（）更改为：
public boolean onNavigationItemSelected(MenuItem menuItem) {
switch(menuItem.getItemId()){
case R.id.nav_home2:
startActivity(new Intent(Menu2.this, QuizActivity.class));
break;
case R.id.nav_about2:
startActivity(new Intent(Menu2.this, Menu3.class));
break;
}
return true;
}