安卓工作室：在导航抽屉标题中单击图像视图时"App has stopped"

当我单击导航抽屉标题上的ImageView转到下一个活动时，应用程序崩溃了。

这是代码：

对于主活动.java：

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//        ActionBar actionBar = getSupportActionBar();
//        actionBar.setDisplayShowHomeEnabled(true);
//        actionBar.setIcon(R.mipmap.ic_launcher);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
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);
navigationView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this, Profile.class));
}
});

对于nav_header_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/nav_header"
android:layout_width="match_parent"
android:layout_height="@dimen/nav_header_height"
android:background="@drawable/side_nav_bar"
android:gravity="bottom"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:theme="@style/ThemeOverlay.AppCompat.Dark">
<ImageView
android:id="@+id/profile_image"
android:layout_width="83dp"
android:layout_height="75dp"
android:paddingTop="@dimen/nav_header_vertical_spacing"
android:scaleType="fitCenter"
android:clickable="true"
android:onClick="onClick"
app:srcCompat="@drawable/profile" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/nav_header_vertical_spacing"
android:text="Android Studio"
android:textAppearance="@style/TextAppearance.AppCompat.Body1" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="android.studio@android.com" />
</LinearLayout>

简介.class：

public class Profile extends Fragment{
View myView; //A view object called myView
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
myView = inflater.inflate(R.layout.profile, container, false);
return myView;
}
}

原木：

11-25 17:30:34.959 6126-6126/? I/zygote: Not late-enabling -Xcheck:jni (already on)
11-25 17:30:35.098 6126-6126/? W/zygote: Unexpected CPU variant for X86 using defaults: x86
11-25 17:30:35.179 6126-6133/? E/zygote: Failed writing handshake bytes (-1 of 14): Broken pipe
11-25 17:30:35.179 6126-6133/? I/zygote: Debugger is no longer active
11-25 17:30:35.791 6126-6126/? I/InstantRun: starting instant run server: is main process
11-25 17:30:36.123 6126-6151/? D/OpenGLRenderer: HWUI GL Pipeline
[ 11-25 17:30:36.160  6126: 6151 D/         ]
HostConnection::get() New Host Connection established 0x9fe29800, tid 6151
11-25 17:30:36.323 6126-6151/com.example.hci I/zygote: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
11-25 17:30:36.323 6126-6151/com.example.hci I/OpenGLRenderer: Initialized EGL, version 1.4
11-25 17:30:36.323 6126-6151/com.example.hci D/OpenGLRenderer: Swap behavior 1
11-25 17:30:36.323 6126-6151/com.example.hci W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
11-25 17:30:36.323 6126-6151/com.example.hci D/OpenGLRenderer: Swap behavior 0
11-25 17:30:36.325 6126-6151/com.example.hci D/EGL_emulation: eglCreateContext: 0xa28040c0: maj 2 min 0 rcv 2
11-25 17:30:36.327 6126-6151/com.example.hci D/EGL_emulation: eglMakeCurrent: 0xa28040c0: ver 2 0 (tinfo 0xa2803140)
11-25 17:30:36.340 6126-6131/com.example.hci I/zygote: Do partial code cache collection, code=12KB, data=19KB
11-25 17:30:36.342 6126-6131/com.example.hci I/zygote: After code cache collection, code=12KB, data=19KB
11-25 17:30:36.342 6126-6131/com.example.hci I/zygote: Increasing code cache capacity to 128KB
11-25 17:30:36.345 6126-6131/com.example.hci I/zygote: Do partial code cache collection, code=12KB, data=37KB
11-25 17:30:36.345 6126-6131/com.example.hci I/zygote: After code cache collection, code=12KB, data=37KB
11-25 17:30:36.345 6126-6131/com.example.hci I/zygote: Increasing code cache capacity to 256KB
11-25 17:30:36.346 6126-6131/com.example.hci I/zygote: JIT allocated 71KB for compiled code of void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
11-25 17:30:36.346 6126-6131/com.example.hci I/zygote: Compiler allocated 4MB to compile void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
11-25 17:30:36.388 6126-6151/com.example.hci D/EGL_emulation: eglMakeCurrent: 0xa28040c0: ver 2 0 (tinfo 0xa2803140)
11-25 17:30:39.559 6126-6126/com.example.hci D/AndroidRuntime: Shutting down VM
11-25 17:30:39.561 6126-6126/com.example.hci E/AndroidRuntime: FATAL EXCEPTION: main
  Process: com.example.hci, PID: 6126
  java.lang.IllegalStateException: Could not find method onClick(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatImageView with id 'profile_image'
      at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:327)
      at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
      at android.view.View.performClick(View.java:6294)
      at android.view.View$PerformClick.run(View.java:24770)
      at android.os.Handler.handleCallback(Handler.java:790)
      at android.os.Handler.dispatchMessage(Handler.java:99)
      at android.os.Looper.loop(Looper.java:164)
      at android.app.ActivityThread.main(ActivityThread.java:6494)
      at java.lang.reflect.Method.invoke(Native Method)
      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

如何解决这个问题？

行中的ImageView：

ImageView img = (ImageView) findViewById(R.id.profile_image);

不用删除它会解决导航View中的错误，还要记住它的null。

此外，请删除 xml 中ImageView的属性android:onClick="onClick"，因为您尚未在活动中定义任何名为onClick的方法。

但是使用我的直觉，你想在单击标题时进行另一个活动(Profile.class)，请使用以下命令：

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
View header_view = navigationView.getHeaderView(0);
ImageView img = (ImageView) header_view.findViewById(R.id.profile_image);
img.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this, Profile.class));
}
});

但是，如果您只想在单击 (ImageView) 时转到另一个活动，请执行以下操作：

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
View header_view = navigationView.getHeaderView(0);
header_view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this, Profile.class));
}
});

问题出在此代码中只需从点击中删除图像视图

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
navigationView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//remove below image view line
ImageView img = (ImageView) findViewById(R.id.profile_image);
startActivity(new Intent(MainActivity.this, Profile.class));
}
});

这样做的原因是您获得的图像视图位于导航视图中，而不是在主XML中。

你以错误的方式投射imageView。将此行添加到导航抽屉活动的onCreate()内。

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
View view = navigationView.getHeaderView(0);
ImageView yourProfileImageView=(ImageView)view.findViewById(R.id.userProfilePicture);

然后

yourProfileImageView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Intent intent = new Intent(v.getContext(),ProfileActivity.class);
startActivity(intent);
}
});

现在，只需单击导航标题中的 ImageView，您就可以开始新活动。

您正在尝试从活动开始片段。该应用程序将自动崩溃。因此，您应该在图像视图的onClick方法中使用以下代码。

然后在您的活动中执行此操作以添加片段：

FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.container,new Profile(),YOUR_FRAGMENT_STRING_TAG);
transaction.addToBackStack(null);
transaction.commit();

要替换片段，请执行以下操作：

FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.container,new Profile(),YOUR_FRAGMENT_STRING_TAG);
transaction.addToBackStack(null);
transaction.commit();

这里容器是框架布局的 id

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