Question

我有两个activities，尝试按一个按钮从第一个导航到第二个导航。第一个是这样的：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_first);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab_new_message);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent myIntent = new Intent(FirstActivity.this, SecondActivity.class);
            startActivity(myIntent);
        }
    });
}

第二个是这样的：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_second);
   // other stuff
}

当按下 Floating Action Button 时，绝对没有任何反应。我的代码出了什么问题？

更新：这是清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="...">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".firstActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="secondActivity"></activity>

    </application>

</manifest>

这是浮动操作按钮的代码：

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    //Button button = (Button) findViewById(R.id.button);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast toast = Toast.makeText(getApplicationContext(), "Pressed!", Toast.LENGTH_LONG);
            toast.show();
                        }
    });

在XML中：

 <android.support.design.widget.FloatingActionButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:id="@+id/fab"
    android:tint="@android:color/white"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    app:fabSize="mini"
    android:layout_alignParentRight="true" />

整个布局：

    <?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:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:id="@+id/fab"
        android:tint="@android:color/white"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        app:fabSize="mini"
        android:layout_alignParentRight="true" />

    <ListView
        android:id="@+id/list_of_messages"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:clickable="true"
        android:divider="@android:color/transparent"
        android:dividerHeight="16dp"
        android:focusable="auto"
        android:focusableInTouchMode="true" />
</RelativeLayout>

Answer 1

尝试在Manifest.xml文件中更改为此内容：

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".FirstActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".SecondActivity"></activity>

</application>

修改 -
将FAB置于最前用途：
在fab.bringToFront();设置之前onClickListener。

感谢您指出Mike M

Answer 2

使用以下代码解决您的问题，为我工作：

  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();
        }
    });

    <android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    app:srcCompat="@android:drawable/ic_dialog_email" />

无法在活动之间导航

2 个答案: