小编Aks*_*han的帖子

我只是一个初学者,我在这里搜索了这个问题,发现4-5问题但是没有帮助我.我只是在Actionbar中尝试searchView,我的活动是AppCompatActivity我的代码在下面.我在这个活动中使用工具栏.并使用这个库.OncreatOptionMenu:

 @Override
public boolean onCreateOptionsMenu(Menu menu) {

    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_main, menu);
    SearchManager SManager =  (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    MenuItem searchMenuItem = menu.findItem(R.id.action_search);
    SearchView searchViewAction = (SearchView) MenuItemCompat.getActionView(searchMenuItem);
    searchViewAction.setSearchableInfo(SManager.getSearchableInfo(getComponentName()));
    searchViewAction.setIconifiedByDefault(false);

    return super.onCreateOptionsMenu(menu);
}

XML:

<item android:id="@+id/action_search"
    android:title="action_search"
    MainActivity:showAsAction="ifRoom"
    MainActivity:actionViewClass="android.support.v7.widget.SearchView" />

和logcat:

java.lang.NullPointerException
        at algonation.com.spm.MainActivity.onCreateOptionsMenu(MainActivity.java:183)
        at android.app.Activity.onCreatePanelMenu(Activity.java:2571)
        at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:277)
        at android.support.v7.internal.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:84)
        at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallback.onCreatePanelMenu(AppCompatDelegateImplBase.java:251)
        at android.support.v7.internal.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:84)
        at android.support.v7.internal.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:449)
        at android.support.v7.internal.app.ToolbarActionBar$1.run(ToolbarActionBar.java:66)
        at android.os.Handler.handleCallback(Handler.java:808)
        at android.os.Handler.dispatchMessage(Handler.java:103)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:5292)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
        at dalvik.system.NativeStart.main(Native Method)

如果你需要MainActivity的完整代码,请告诉我..非常感谢你.

我想将背景颜色设置为我的布局,颜色必须随机生成,直到现在我使用此代码生成颜色但颜色太深,但我不想要这些深色,只需要浅色和柔和的颜色.

Random rnd = new Random();
    int r = rnd.nextInt(155) + 100; // 128 ... 255
    int g = rnd.nextInt(155) + 010; // 128 ... 255
    int b = rnd.nextInt(155) + 001; // 128 ... 255

    int clr = Color.rgb(r, g, b);