Android中活动中的软键盘打开和关闭侦听器

Question

我有一个活动，其中有5个编辑文本s。当用户单击第一个编辑文本时，软键盘打开，在其中输入一些值。当软键盘打开时，当用户单击第一个EditText时，以及当软键盘从按下后退按钮的相同EditText关闭时，我想将其他一些视图的可见性设置为Gone。然后我想将其他一些视图的可见性设置为visible。

在Android系统中，当点击第一个EditText打开软键盘时，是否有任何侦听器、回调或黑客攻击？




Answer 1

正如Vikram在评论中指出的那样，检测软键盘是否显示或消失只有通过一些丑陋的黑客才能实现。

也许在edittext上设置一个焦点侦听器就足够了：

yourEditText.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            //got focus
        } else {
            //lost focus
        }
   }
});

Answer 2

仅当活动的android:windowSoftInputMode在清单中设置为adjustResize时，此选项才有效。您可以使用布局侦听器查看活动的根布局是否已通过键盘调整大小。

我的活动使用以下基类：

public class BaseActivity extends Activity {
    private ViewTreeObserver.OnGlobalLayoutListener keyboardLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            int heightDiff = rootLayout.getRootView().getHeight() - rootLayout.getHeight();
            int contentViewTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();

            LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(BaseActivity.this);

            if(heightDiff <= contentViewTop){
                onHideKeyboard();

                Intent intent = new Intent("KeyboardWillHide");
                broadcastManager.sendBroadcast(intent);
            } else {
                int keyboardHeight = heightDiff - contentViewTop;
                onShowKeyboard(keyboardHeight);

                Intent intent = new Intent("KeyboardWillShow");
                intent.putExtra("KeyboardHeight", keyboardHeight);
                broadcastManager.sendBroadcast(intent);
            }
        }
    };

    private boolean keyboardListenersAttached = false;
    private ViewGroup rootLayout;

    protected void onShowKeyboard(int keyboardHeight) {}
    protected void onHideKeyboard() {}

    protected void attachKeyboardListeners() {
        if (keyboardListenersAttached) {
            return;
        }

        rootLayout = (ViewGroup) findViewById(R.id.rootLayout);
        rootLayout.getViewTreeObserver().addOnGlobalLayoutListener(keyboardLayoutListener);

        keyboardListenersAttached = true;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (keyboardListenersAttached) {
            rootLayout.getViewTreeObserver().removeGlobalOnLayoutListener(keyboardLayoutListener);
        }
    }
}

以下示例活动使用此选项在显示键盘时隐藏视图，并在隐藏键盘时再次显示视图。

xml布局：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/rootLayout"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">              

    <ScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        >

        <!-- omitted for brevity -->

    </ScrollView>

    <LinearLayout android:id="@+id/bottomContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >

        <!-- omitted for brevity -->

    </LinearLayout>

</LinearLayout>

和活动：

public class TestActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test_activity);

        attachKeyboardListeners();
    }

    @Override
    protected void onShowKeyboard(int keyboardHeight) {
        // do things when keyboard is shown
        bottomContainer.setVisibility(View.GONE);
    }

    @Override
    protected void onHideKeyboard() {
        // do things when keyboard is hidden
        bottomContainer.setVisibility(View.VISIBLE);
    }        
}

Answer 3

拥有令人敬畏的键盘可视性事件库的小菜一碟

KeyboardVisibilityEvent.setEventListener(
    getActivity(),
    new KeyboardVisibilityEventListener() {
        @Override
        public void onVisibilityChanged(boolean isOpen) {
            // Ah... at last. do your thing :)
        }
    });

Yasuhiro SHIMIZU的学分