问

Appcompatv7 - v21导航抽屉不显示汉堡包图标

sdfaghasfdg4 发布于 2022-12-13 05:21

import

我正在使用最新的appcompat支持库实现棒棒糖风格的导航抽屉,但问题是汉堡包图标永远不会显示.仅显示后退图标.

这是我的活动代码

import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.Toolbar;
import android.view.View;

public class Home extends ActionBarActivity {

private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;

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


private void initViews(){

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);


    toolbar.setTitleTextColor(getResources().getColor(android.R.color.white));
    setSupportActionBar(toolbar);

    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,toolbar ,  R.string.drawer_open, R.string.drawer_close) { 

        /** Called when a drawer has settled in a completely closed state. */ 
        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            //getActionBar().setTitle(mTitle);
            //invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        } 

        /** Called when a drawer has settled in a completely open state. */ 
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            //getActionBar().setTitle(mDrawerTitle);
            //invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
        } 
    }; 


    // Set the drawer toggle as the DrawerListener 
    mDrawerLayout.setDrawerListener(mDrawerToggle);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
    getSupportActionBar().setHomeButtonEnabled(true); 

 }
}

这是我的样式文件

布局文件

显示后面按钮的导航抽屉

在这两种情况下只显示了后退箭头,我已阅读了很多帖子,但似乎没有任何区别.任何帮助,将不胜感激.

7 个回答

你需要打电话
```
mDrawerToggle.syncState();
```
2022-12-13 05:39 回答

jerry613
确保您导入正确的抽屉切换.

当我导入v4版本时,我有箭头(下面).
```
import android.support.v4.app.ActionBarDrawerToggle;
```
将其更改为此(下面,v7)修复了我的问题.
```
import android.support.v7.app.ActionBarDrawerToggle;
```
2022-12-13 05:46 回答

-依小冷_217

确保你打电话

mDrawerToggle.syncState();

打电话之后

getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
getSupportActionBar().setHomeButtonEnabled(true);

2022-12-13 05:47 回答

你说Dan_795

使用ActionBarDrawerToggle时,必须在onPostCreate()和onConfigurationChanged()期间调用它

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggls
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

2022-12-13 05:54 回答

孟海滨_554

由于我的NavigationDrawer正在扩展Fragment而不是Activity,因此我无法覆盖postCreate.以下是我的所作所为.

   ActionBar actionBar = getActionBar();
   actionBar.setDisplayHomeAsUpEnabled(true); // this sets the button to the    back icon
   actionBar.setHomeButtonEnabled(true); // makes it clickable
   actionBar.setHomeAsUpIndicator(R.drawable.ic_drawer);// set your own icon

希望能帮助到你!

2022-12-13 06:00 回答

fover黄瓜小妞1

您可以简单地使用：

// Defer code dependent on restoration of previous instance state.
mDrawerLayout.post(new Runnable() {
    @Override
    public void run() {
        mDrawerToggle.syncState();
        getActionBar().setHomeAsUpIndicator(R.drawable.ic_drawer);
    }
});

2022-12-13 06:06 回答

mobiledu2502912817

不要忘记覆盖onOptionsItemSelected方法并检查是否单击了ctionBarDrawerToggle,在这种情况下返回true,否则活动将完成.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

2022-12-13 06:10 回答

BrucelLi

撰写答案

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