我正在尝试将SearchView添加到Material Design Toolbar / ActionBar,以便默认情况下扩展SearchView并占用工具栏的整个空间宽度.到目前为止,我有以下工具栏.

它的问题是：

>我希望“搜索”图标与屏幕左边缘的距离与屏幕右边缘的X图标的距离相同.我怎样才能做到这一点？

>只有当我开始键入搜索查询时,才会显示X图标,如果我通过按下它取消查询,它就会消失.我希望它一出现工具栏就出现在那里(一旦Activity出现),即使没有搜索查询(由用户键入),并且搜索提示文本可见,我也希望它停留在那里.我怎样才能做到这一点？

我做了什么：

我试图将android：contentInsetStart,android：contentInsetLeft,app：contentInsetStart和app：contentInsetLeft添加到工具栏XML,这没有帮助.然后我尝试从Activity的onCreate()中找到工具栏(通过findViewById()),然后执行toolbar.setContentInsetsAbsolute(0,0);.没有帮助.

然后我尝试将setSupportActionBar(工具栏)添加到onCreate()和ActionBar.LayoutParams params = new ActionBar.LayoutParams(ActionBar.LayoutParams.MATCH_PARENT,ActionBar.LayoutParams.MATCH_PARENT);

searchView.setLayoutParams(PARAMS);在onCreateOptionsMenu()中,但是徒劳无功.

SSCCE代码：

MainActivity.java

public class MainActivity extends AppCompatActivity {

private TextView textView;

private Toolbar toolbar;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

textView = (TextView) findViewById(R.id.mainActivity_textView);

toolbar = (Toolbar) findViewById(R.id.mainActivity_toolbar);

setSupportActionBar(toolbar);

toolbar.setContentInsetsAbsolute(0,0);

handleIntent(getIntent());

}

@Override

protected void onNewIntent(Intent intent) {

setIntent(intent);

handleIntent(intent);

}

private void handleIntent(Intent intent) {

if (Intent.ACTION_SEARCH.equals(intent.getAction())) {

String query = intent.getStringExtra(SearchManager.QUERY);

doMySearch(query);

}

}

private void doMySearch(String searchQuery) {

textView.setText(searchQuery);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

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

// Inflate the options menu from XML

MenuInflater inflater = getMenuInflater();

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

// Get the SearchView and set the searchable configuration

SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);

MenuItem searchMenuItem = menu.findItem(R.id.action_search);

SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchMenuItem);

// Assumes current activity is the searchable activity

searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

//searchView.setIconifiedByDefault(false); // Do not iconify the widget; expand it by default

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

return super.onOptionsItemSelected(item);

}

}

activity_main.xml中

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="practice_projects.materialdesigngooglenowlikesearchviewgive.MainActivity" >

layout="@layout/app_bar"/>

android:id="@+id/mainActivity_textView"

android:layout_below="@id/mainActivity_toolbar"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/hello_world" />

app_bar.xml

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:contentIntentStart="0dp"

android:contentIntentLeft="0dp"

app:contentIntentStart="0dp"

app:contentIntentLeft="0dp" >

RES /菜单/ main.xml中

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

tools:context="practice_projects.materialdesigngooglenowlikesearchviewgive.MainActivity" >

android:id="@+id/action_search"

android:orderInCategory="100"

android:title="@string/searchMenuIcon_title"

android:icon="@drawable/ic_search_black_24dp"

app:showAsAction="always"

app:actionViewClass="android.support.v7.widget.SearchView"

app:iconifiedByDefault="false" />

RES / XML / searchable.xml

android:label="@string/app_name"

android:hint="@string/search_hint" >

RES /值/ styles.xml

@color/primary

@color/primaryDark

@color/accent

RES /值* -v21 * / styles.xml