Android - 尝试在空对象引用上调用虚拟方法 'void android.view.View.getBoundsOnScreen(android.graphics.Rect)'

Question

我有一个这样的简单地址表格:

Java:

public class NewAddressActivity extends AppCompatActivity {

private TextInputLayout mStreetLayout;
private TextInputLayout mNumberLayout;
private TextInputLayout mNeighborhoodLayout;
private TextInputLayout mCityLayout;
private TextInputLayout mStateLayout;
private TextInputLayout mCepLayout;
private TextInputLayout mPhoneLayout;
private EditText mStreetText;
private EditText mNumberText;
private EditText mComplementText;
private EditText mNeighborhoodText;
private EditText mCityText;
private EditText mStateText;
private EditText mCepText;
private EditText mPhoneText;

private Address mAddressEditing;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_new_address);

    ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
        actionBar.setDisplayHomeAsUpEnabled(true);
    }

    mStreetLayout = findViewById(R.id.street_layout);
    mNumberLayout = findViewById(R.id.number_layout);
    mNeighborhoodLayout = findViewById(R.id.neighborhood_layout);
    mCityLayout = findViewById(R.id.city_layout);
    mStateLayout = findViewById(R.id.state_layout);
    mCepLayout = findViewById(R.id.cep_layout);
    mPhoneLayout = findViewById(R.id.phone_layout);
    mStreetText = findViewById(R.id.street_text);
    mNumberText = findViewById(R.id.number_text);
    mComplementText = findViewById(R.id.complement_text);
    mNeighborhoodText = findViewById(R.id.neighborhood_text);
    mCityText = findViewById(R.id.city_text);
    mStateText = findViewById(R.id.state_text);
    mCepText = findViewById(R.id.cep_text);
    mPhoneText = findViewById(R.id.phone_text);

    mAddressEditing = getIntent().getParcelableExtra(AppConstants.ADDRESS_EXTRA);

    if (mAddressEditing != null) {
        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
        if (actionBar != null) {
            actionBar.setTitle(R.string.edit_address);
        }
        mStreetText.setText(mAddressEditing.getStreet());
        mNumberText.setText(mAddressEditing.getNumber());
        mComplementText.setText(mAddressEditing.getComplement());
        mNeighborhoodText.setText(mAddressEditing.getNeighborhood());
        mCityText.setText(mAddressEditing.getCity());
        mStateText.setText(mAddressEditing.getState());
        mCepText.setText(mAddressEditing.getCep());
        mPhoneText.setText(mAddressEditing.getPhone());
        mStreetText.setSelection(mAddressEditing.getStreet().length());
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_new_address, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            finish();
            return true;
        case R.id.action_save:
            save();
            return true;
    }
    return super.onOptionsItemSelected(item);
}

@SuppressLint("StaticFieldLeak")
private void save() {
    String street = mStreetText.getText().toString().trim();
    String number = mNumberText.getText().toString().trim();
    String complement = mComplementText.getText().toString().trim();
    String neighborhood = mNeighborhoodText.getText().toString().trim();
    String city = mCityText.getText().toString().trim();
    String state = mStateText.getText().toString().trim();
    String cep = mCepText.getText().toString().trim();
    String phone = mPhoneText.getText().toString().trim();

    boolean hasError = false;

    if (TextUtils.isEmpty(street)) {
        hasError = true;
        mStreetLayout.setErrorEnabled(true);
        mStreetLayout.setError(getString(R.string.fill_the_field));
    }
    if (TextUtils.isEmpty(number)) {
        hasError = true;
        mNumberLayout.setErrorEnabled(true);
        mNumberLayout.setError(getString(R.string.fill_the_field));
    }
    if (TextUtils.isEmpty(neighborhood)) {
        hasError = true;
        mNeighborhoodLayout.setErrorEnabled(true);
        mNeighborhoodLayout.setError(getString(R.string.fill_the_field));
    }
    if (TextUtils.isEmpty(city)) {
        hasError = true;
        mCityLayout.setErrorEnabled(true);
        mCityLayout.setError(getString(R.string.fill_the_field));
    }
    if (TextUtils.isEmpty(state)) {
        hasError = true;
        mStateLayout.setErrorEnabled(true);
        mStateLayout.setError(getString(R.string.fill_the_field));
    }
    if (TextUtils.isEmpty(cep)) {
        hasError = true;
        mCepLayout.setErrorEnabled(true);
        mCepLayout.setError(getString(R.string.fill_the_field));
    }
    if (TextUtils.isEmpty(phone)) {
        hasError = true;
        mPhoneLayout.setErrorEnabled(true);
        mPhoneLayout.setError(getString(R.string.fill_the_field));
    }

    if (hasError) {
        return;
    }

    final Address address = new Address();
    if (mAddressEditing != null) {
        mAddressEditing.setStreet(street);
        mAddressEditing.setNumber(number);
        mAddressEditing.setComplement(complement);
        mAddressEditing.setNeighborhood(neighborhood);
        mAddressEditing.setCity(city);
        mAddressEditing.setState(state);
        mAddressEditing.setCep(cep);
        mAddressEditing.setPhone(phone);
    } else {
        address.setStreet(street);
        address.setNumber(number);
        address.setComplement(complement);
        address.setNeighborhood(neighborhood);
        address.setCity(city);
        address.setState(state);
        address.setCep(cep);
        address.setPhone(phone);
    }

    new AsyncTask<Void, Void, Void>() {
        @Override
        protected Void doInBackground(Void... voids) {
            if (mAddressEditing != null) {
                MainApplication.getInstance().getAddressDao().update(mAddressEditing);
            } else {
                MainApplication.getInstance().getAddressDao().insert(address);
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            Toast.makeText(NewAddressActivity.this,
                    mAddressEditing != null ? R.string.address_edited_successfully :
                            R.string.address_created_successfully, Toast.LENGTH_SHORT).show();
            setResult(Activity.RESULT_OK);
            finish();
        }
    }.execute();
}
}

xml:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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="wrap_content">

<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <android.support.design.widget.TextInputLayout
        android:id="@+id/street_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toTopOf="parent">


        <EditText
            android:id="@+id/street_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/street"
            android:imeOptions="actionNext"
            android:inputType="textCapSentences"
            android:maxLines="1"
            android:singleLine="true" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/number_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toBottomOf="@id/street_layout">

        <EditText
            android:id="@+id/number_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/number"
            android:imeOptions="actionNext"
            android:inputType="textCapSentences"
            android:maxLines="1"
            android:singleLine="true" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/complement_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toBottomOf="@id/number_layout">

        <EditText
            android:id="@+id/complement_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/complement"
            android:imeOptions="actionNext"
            android:inputType="textCapSentences"
            android:maxLines="1"
            android:singleLine="true" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/neighborhood_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toBottomOf="@id/complement_layout">

        <EditText
            android:id="@+id/neighborhood_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/neighborhood"
            android:imeOptions="actionNext"
            android:inputType="textCapSentences"
            android:maxLines="1"
            android:singleLine="true" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/city_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toBottomOf="@id/neighborhood_layout">

        <EditText
            android:id="@+id/city_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/city"
            android:imeOptions="actionNext"
            android:inputType="textCapSentences"
            android:maxLines="1"
            android:singleLine="true" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/state_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toBottomOf="@id/city_layout">

        <EditText
            android:id="@+id/state_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/state"
            android:imeOptions="actionNext"
            android:inputType="textCapSentences"
            android:maxLines="1"
            android:singleLine="true" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/cep_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toBottomOf="@id/state_layout">

        <EditText
            android:id="@+id/cep_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/cep"
            android:imeOptions="actionNext"
            android:inputType="number"
            android:maxLines="1"
            android:singleLine="true" />
    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/phone_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="50dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginStart="50dp"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toBottomOf="@id/cep_layout">

        <EditText
            android:id="@+id/phone_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/phone"
            android:imeOptions="actionDone"
            android:inputType="phone|textCapSentences"
            android:maxLines="1"
            android:singleLine="true" />
    </android.support.design.widget.TextInputLayout>
</android.support.constraint.ConstraintLayout>
</ScrollView>

如何在 java 上看到，mAddressEditing 变量是从 Intent 接收的，当它不为 null 时表示用户想要编辑其地址。

所有字段都按预期填写，但是当我点击编辑文本以更改其值时，它崩溃了...

崩溃:

FATAL EXCEPTION: main 
Process: br.com.fornaro.armariovirtual, PID: 5540
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.getBoundsOnScreen(android.graphics.Rect)' on a null object reference at android.app.assist.AssistStructure$WindowNode.<init>(AssistStructure.java:484)
at android.app.assist.AssistStructure.<init>(AssistStructure.java:1908)
at android.app.ActivityThread.handleRequestAssistContextExtras(ActivityThread.java:3035)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1807)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

我不知道它为什么会崩溃。

重现步骤:1. 编辑上一个屏幕中的地址，将地址对象作为参数传递给 Intent 2.单击编辑文本以更改其值3. 崩溃!

Answer 1

问题是一个已知的 Android 错误。从 Google 问题跟踪器建议来看，在 TextInputEditText 上设置提示似乎会导致崩溃。仅在 TextInputLayout 上设置提示可修复崩溃。

This issue only happens IF the hint is set on the nested EditText inside the TextInputLayout. I resolved it by setting the hint on the TextInputLayout.

https://issuetracker.google.com/issues/62834931评论 #28