![](/img/trans.png)
[英]java.lang.ClassCastException: android.support.design.widget.AppBarLayout cannot be cast to android.support.v7.widget.Toolbar
[英]java.lang.ClassCastException: android.support.v7.widget.AppCompatButton cannot be cast to android.support.design.widget.FloatingActionButton
這根本不是一個干凈的重建問題! Make模塊也無法解決此問題。 這是我在代碼中使用的唯一FlotingActionButton。 一種解決方案說,這僅與錨參數一起發生,但是如您所見,我沒有使用錨參數,所以我不知道該怎么做。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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:id="@+id/activity_main"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/coverpic"
tools:context="com.android.nohiccupsbeta.MainActivity">
<android.support.design.widget.CoordinatorLayout
android:id="@+id/effects_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_gravity="top|end"
android:layout_marginTop="400dp"
android:layout_marginRight="15dp"
android:src="@drawable/ic_book"
app:backgroundTint="@color/primary_color" />
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.CoordinatorLayout
android:id="@+id/take_test"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
app:backgroundTint="@color/primary_color"
android:src="@drawable/ic_handcuffs" />
</android.support.design.widget.CoordinatorLayout>
</RelativeLayout>
這是JAVA代碼。 我嘗試導入協調器布局,但這是不可能的。 我也嘗試以不同的方式聲明fab var,以得到相同的錯誤:
package com.android.nohiccupsbeta;
import android.content.Intent;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FloatingActionButton fab = (FloatingActionButton)findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, pageone.class));
}
});
FloatingActionButton fab2 = (FloatingActionButton)findViewById(R.id.fab2);
fab2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, BacTest.class));
}
});
}
}
您的第二個FloatingActionButton沒有id,而您嘗試投射到FAB的id是CoordinatorLayout。
因此,您應該像這樣在晶圓廠的布局中設置ID
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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:id="@+id/activity_main"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/coverpic">
<android.support.design.widget.CoordinatorLayout
android:id="@+id/effects_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_gravity="top|end"
android:layout_marginTop="400dp"
android:layout_marginRight="15dp"
android:src="@drawable/ic_book"
app:backgroundTint="@color/primary_color" />
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.CoordinatorLayout
android:id="@+id/take_test"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
app:backgroundTint="@color/primary_color"
android:src="@drawable/ic_handcuffs" />
</android.support.design.widget.CoordinatorLayout>
</RelativeLayout>
和您的工廠匹配這樣的新ID
FloatingActionButton fab = (FloatingActionButton)findViewById(R.id.fab);
FloatingActionButton fab2 = (FloatingActionButton)findViewById(R.id.fab2);
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