Android布局膨胀异常：登录界面无法显示应用崩溃求助

我开发的Android应用登录界面在模拟器里完全显示不出来，一启动就提示“Your application has been Stopped”。奇怪的是login_screen.xml在设计器里布局显示正常，而且我已经在Manifest文件里配置了LoginScreen，但错误还是反复出现。

Layout Code (login_screen.xml) #

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/black" >

    <RelativeLayout
        android:id="@+id/relMyHead"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:background="@drawable/loginimage">

        <EditText
            android:id="@+id/edt_userName"
            android:layout_width="260dp"
            android:layout_height="48dp"
            android:layout_below="@+id/img_login_logo"
            android:layout_centerInParent="true"
            android:layout_marginLeft="6dp"
            android:layout_marginTop="150dp"
            android:drawableLeft="@drawable/envelope"
            android:drawablePadding="14dp"
            android:drawableStart="@drawable/envelope"
            android:hint="@string/Email"
            android:inputType="textEmailAddress"
            android:padding="4dp"
            android:singleLine="true"
            android:textColor="@color/blue_500"
            android:textColorHint="#BBBBBB">
            <requestFocus />
        </EditText>

        <EditText
            android:id="@+id/edt_password"
            android:layout_width="260dp"
            android:layout_height="48dp"
            android:layout_alignLeft="@+id/edt_userName"
            android:layout_below="@+id/edt_userName"
            android:layout_marginRight="6dp"
            android:layout_marginTop="10dp"
            android:drawableLeft="@drawable/key"
            android:drawablePadding="14dp"
            android:hint="@string/password"
            android:inputType="textPassword"
            android:padding="4dp"
            android:password="true"
            android:singleLine="true"
            android:textColor="@color/black"
            android:textColorHint="#BBBBBB" />

        <Button
            android:id="@+id/btn_Login"
            android:layout_width="wrap_content"
            android:layout_height="40dp"
            android:layout_alignLeft="@+id/edt_password"
            android:layout_alignRight="@+id/edt_password"
            android:layout_below="@+id/edt_password"
            android:layout_marginTop="20dp"
            android:background="@drawable/loginimage"
            android:gravity="center"
            android:letterSpacing="0.1"
            android:text="@string/btn_login"
            android:textColor="@color/white"
            android:textStyle="bold"
            tools:foregroundTintMode="screen" />

        <ImageView
            android:id="@+id/img_login_logo"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="100dp"
            android:adjustViewBounds="true"
            android:contentDescription="@string/app_name"
            android:minHeight="500dp"
            android:scaleType="fitCenter"
            android:src="@drawable/csrlogo_2x" />

        <LinearLayout
            android:id="@+id/new_user_reg_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/btn_Login"
            android:layout_marginTop="25dp"
            android:gravity="center_horizontal"
            android:longClickable="false">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:fontFamily="@font/roboto"
                android:letterSpacing="0.1"
                android:text="@string/not_member"
                android:textColor="@color/barLightColor"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/register"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:clickable="true"
                android:letterSpacing="0.1"
                android:textColor="@color/popup_text_color"
                android:textSize="20sp" />
        </LinearLayout>

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/img_login_logo"
            android:layout_centerHorizontal="true"
            android:fontFamily="@font/roboto"
            android:letterSpacing="0.2"
            android:text="TRAVEL ASSIST"
            android:textColor="@color/popup_text_color"
            android:textSize="25sp"
            android:textStyle="bold" />
    </RelativeLayout>
</RelativeLayout>

Error Log #

Caused by: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class <unknown>
at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:393)
at android.app.Activity.setContentView(Activity.java:2166)
at com.example.developer.travelassistmobileapp.LoginScreen.onCreate(LoginScreen.java:51)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(A

Troubleshooting Steps & Fixes #

Let's break down the most likely causes for this InflateException (since the error log is truncated, these are the top suspects based on your layout):

1. Check Drawable Resources

   • Your layout references several drawables: @drawable/loginimage, @drawable/envelope, @drawable/key, @drawable/csrlogo_2x.
     • Verify these files exist in your res/drawable (or density-specific) folders.
     • Ensure filenames are all lowercase (Android is case-sensitive for resources) and have no spaces/special characters.
     • Check if the images are corrupted or in an unsupported format (stick to PNG/JPG for bitmaps).
   • Note: Your Button uses @drawable/loginimage as a background—if this is a large bitmap, it might cause memory issues. Try replacing it with a simple shape drawable temporarily to test.

2. Fix the ImageView's MinHeight

   • The img_login_logo ImageView has android:minHeight="500dp" but its layout_height is set to 100dp. This mismatch can cause layout calculation errors. Remove the minHeight attribute entirely and test again.

3. Verify Font Resources

   • You're using @font/roboto for some TextViews.
     • Make sure the roboto.ttf (or corresponding font files) are placed in res/font/.
     • If targeting API levels below 26, ensure you're using the Android Support Library's font compatibility features (or switch to a system font like sans-serif temporarily to rule this out).

4. Get the Full Error Stack

   • The error log you provided cuts off—look for the full Caused by line in Logcat. It will tell you exactly what's failing (e.g., ResourceNotFoundException for a missing drawable, OutOfMemoryError for a large image). This is the most critical piece of info to pinpoint the issue.

5. Clean & Rebuild Your Project

   • Sometimes cached resources cause inflation issues. Go to Build > Clean Project then Build > Rebuild Project to clear old artifacts.

6. Double-Check Manifest Configuration

   • Confirm your LoginScreen Activity is declared correctly in AndroidManifest.xml:

     <activity android:name=".LoginScreen">
         <!-- If this is your launch activity, add the intent-filter -->
         <intent-filter>
             <action android:name="android.intent.action.MAIN" />
             <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
     </activity>
     

Start with these steps—chances are one of them will resolve the crash. If you can get the full error log, that will narrow it down even faster!

内容的提问来源于stack exchange，提问作者giri