错误导致：android.view.膨胀异常：二进制 XML 文件行 #2：二进制 XML 文件行 #2：膨胀类<unknown>时出错

Question

我很沮丧，我可能不能很好地解释，但基本上我试图编码一个音乐应用程序播放器，但每当我点击按钮应用程序只是崩溃。Logcat并没有多大帮助，因为我不知道它有什么问题。请帮帮我吧，t

MainActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.startButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(MainActivity.this, "Proceeding to login page", Toast.LENGTH_LONG).show();
openLogIn();

}
});
}
public void openLogIn(){
Intent intent = new Intent(this, Login.class);
startActivity(intent);
}

}

activity_main.xml:

<androidx.constraintlayout.widget.ConstraintLayout 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"
android:background="@color/black"
tools:context=".MainActivity">
<TextView
android:id="@+id/musicAppTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="112dp"
android:layout_marginTop="48dp"
android:layout_marginEnd="112dp"
android:text="@string/apollotunes"
android:textColor="@color/white"
android:textSize="34sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="56dp"
android:layout_marginTop="35dp"
android:layout_marginEnd="57dp"
android:gravity="center"
android:text="@string/millions_of_songs_to_choose_from_n_with_no_interruptions"
android:textColor="@color/white"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView2" />

<ImageView
android:id="@+id/imageView2"
android:layout_width="300dp"
android:layout_height="250dp"
android:layout_marginStart="55dp"
android:layout_marginTop="49dp"
android:layout_marginEnd="56dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/musicAppTitle"
app:srcCompat="@drawable/project_logo" />
<Button
android:id="@+id/startButton"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_marginStart="80dp"
android:layout_marginTop="64dp"
android:layout_marginEnd="81dp"
android:text="@string/let_s_get_started"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textStart" />

Login.java:">

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
TextView email = (TextView) findViewById(R.id.email);
TextView password = (TextView) findViewById(R.id.password);
Button loginbtn = (Button) findViewById(R.id.logInButton);
loginbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(email.getText().toString().equals("[e-mail]") && password.getText().toString().equals("2202231C"))
{
Toast.makeText(Login.this, "", Toast.LENGTH_SHORT).show();
}
else
Toast.makeText(Login.this, "LOGIN FAILED", Toast.LENGTH_SHORT).show();
}
});
}

}";

activity_login.xml:">

<TextView
android:id="@+id/signInText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="83dp"
android:layout_marginTop="76dp"
android:layout_marginEnd="84dp"
android:text="Sign into your account!"
android:textColor="@color/white"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/email"
android:layout_width="350dp"
android:layout_height="50dp"
android:layout_marginStart="30dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="31dp"
android:backgroundTint="@color/white"
android:drawableLeft="@drawable/ic_baseline_email_24"
android:drawablePadding="15dp"
android:hint="Email"
android:textColorHint="@color/white"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/signInText" />
<EditText
android:id="@+id/password"
android:layout_width="350dp"
android:layout_height="50dp"
android:layout_marginStart="30dp"
android:layout_marginTop="28dp"
android:layout_marginEnd="31dp"
android:backgroundTint="@color/white"
android:drawableLeft="@drawable/ic_baseline_lock_24"
android:drawablePadding="15dp"
android:hint="Password"
android:textColorHint="@color/white"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/email"
tools:textSize="20sp" />
<Button
android:id="@+id/logInButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="153dp"
android:layout_marginTop="36dp"
android:layout_marginEnd="164dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/password" />

错误:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.finalapollotunes/com.example.finalapollotunes.Login}: android.view.InflateException: Binary XML file line #2: Binary XML file line #2: Error inflating class <unknown>
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.view.InflateException: Binary XML file line #2: Binary XML file line #2: Error inflating class <unknown>
Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class <unknown>
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)
at com.example.finalapollotunes.Login.onCreate(Login.java:16)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.content.res.Resources$NotFoundException: Drawable (missing name) with resource ID #0x7f0501a5
Caused by: android.content.res.Resources$NotFoundException: Unable to find resource ID #0x7f0501a5
at android.content.res.ResourcesImpl.getResourceName(ResourcesImpl.java:255)
at android.content.res.ResourcesImpl.loadDrawableForCookie(ResourcesImpl.java:785)
at android.content.res.ResourcesImpl.loadDrawable(ResourcesImpl.java:631)
at android.content.res.Resources.loadDrawable(Resources.java:897)
at android.content.res.TypedArray.getDrawableForDensity(TypedArray.java:955)
at android.content.res.TypedArray.getDrawable(TypedArray.java:930)
enter cE/AndroidRuntime:     at android.view.View.<init>(View.java:5010)
at android.view.ViewGroup.<init>(ViewGroup.java:659)
at android.view.ViewGroup.<init>(ViewGroup.java:655)
at android.view.ViewGroup.<init>(ViewGroup.java:651)
at androidx.constraintlayout.widget.ConstraintLayout.<init>(ConstraintLayout.java:587)
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:706)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)
at com.example.finalapollotunes.Login.onCreate(Login.java:16)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)ode here

Answer 1

这就是你的activity_login.xml应该看起来的样子，你必须包含布局标签

<androidx.constraintlayout.widget.ConstraintLayout 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"
android:background="@color/black"
tools:context=".LoginActivity">
<TextView
android:id="@+id/signInText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="83dp"
android:layout_marginTop="76dp"
android:layout_marginEnd="84dp"
android:text="Sign into your account!"
android:textColor="@color/white"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/email"
android:layout_width="350dp"
android:layout_height="50dp"
android:layout_marginStart="30dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="31dp"
android:backgroundTint="@color/white"
android:drawableLeft="@drawable/ic_baseline_email_24"
android:drawablePadding="15dp"
android:hint="Email"
android:textColorHint="@color/white"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/signInText" />
<EditText
android:id="@+id/password"
android:layout_width="350dp"
android:layout_height="50dp"
android:layout_marginStart="30dp"
android:layout_marginTop="28dp"
android:layout_marginEnd="31dp"
android:backgroundTint="@color/white"
android:drawableLeft="@drawable/ic_baseline_lock_24"
android:drawablePadding="15dp"
android:hint="Password"
android:textColorHint="@color/white"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/email"
tools:textSize="20sp" />
<Button
android:id="@+id/logInButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="153dp"
android:layout_marginTop="36dp"
android:layout_marginEnd="164dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/password" />
</androidx.constraintlayout.widget.ConstraintLayout>