相关疑难解决方法(0)

有什么区别,更重要的是在Andriod视图XML中有不同前缀的必要性？

例如,

<android.support.v7.widget.Toolbar
    android:id="@+id/actionToolBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:contentInsetEnd="20dp"
    app:contentInsetEnd="20dp"
    android:elevation="3dp"
  />

有contentInsetEnd两个android和app.

请有人帮帮我!我尝试将appcompat搜索视图添加到我的项目中.不成功.当我将android.support.v7.widget.SearchView更改为SearchView(API> 10)时,一切都很好.

我的菜单res:

<item android:id="@+id/action_search"
    android:title="@string/search_view_title"
    android:icon="@drawable/action_search"
    sabd:showAsAction="always|collapseActionView"
    sabd:actionViewClass="android.support.v7.widget.SearchView" />

这是我如何尝试使用SeachView:

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.teach, menu);
        mSearchItem = menu.findItem(R.id.action_search);
        mSearchItem.setVisible(true);
        mSearchView = (SearchView) MenuItemCompat.getActionView(mSearchItem);
        mSearchView.setQueryHint(getString(R.string.search_view_hint));
        mSearchView.setOnQueryTextListener(this);
    }

这是我的清单文件:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="ru.rgups.time"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/Theme.Base.AppCompat.Light"
        android:name="RTApplication">
        <activity
            android:name="ru.rgups.time.MainActivity"
            android:configChanges="orientation|keyboardHidden"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".fragments.WelcomeActivity"></activity>
        <service android:name=".spice.SampleSpiceService"></service>
        <activity …

这样做时我总是得到textView为null:

public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main, menu);

        MenuItem searchItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat
                .getActionView(searchItem);

        int id = searchView.getContext().getResources().getIdentifier("android:id/search_src_text", null, null);
        TextView textView = (TextView) searchView.findViewById(id);
        textView.setTextColor(Color.WHITE);
}

谁知道为什么？