android - 在android中创建 Activity 时如何获取键盘高度

Question

我想在用户进行特定 Activity 时自动显示与设备键盘高度相同的 ListView 。为此，我调用了三个方法，即 showKeyboard()、getKeyboardHeight() 和 hideKeyboard()，然后为该 ListView 提供高度并显示该 ListView 。但问题是一旦我调用 showKeyboard()，计算高度然后 hideKeyboard()，键盘不会隐藏并保持可见。此外，我得到的高度为 0。我无法显示该 listView。是否有任何其他过程来获取键盘高度或以下代码中的任何更正？请参阅下面的代码:

showKeyboard() 方法 -

private void showKeyboard() {
             InputMethodManager keyboard = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
             keyboard.showSoftInput(editChatBox, 0);
        }

getKeyboardHeight() 方法 -

public int getKeyboardHeight() {
          final View rootview = this.getWindow().getDecorView();
           linearChatLayout.getViewTreeObserver().addOnGlobalLayoutListener(
                new ViewTreeObserver.OnGlobalLayoutListener() {
                    public void onGlobalLayout() {
                        Rect r = new Rect();
                        rootview.getWindowVisibleDisplayFrame(r);
                        int screenHeight = rootview.getRootView().getHeight();
                        int newHeight = screenHeight - (r.bottom - r.top);
                        if (newHeight > heightOfKeyboard) {
                            heightOfKeyboard = screenHeight
                                    - (r.bottom - r.top);
                            // heightOfKeyboard = heightDiff;
                        }

                        Log.d("Keyboard Size", "Size: " + heightOfKeyboard);
                    }
                });
        return heightOfKeyboard;
    }

hideKeyboard() 方法 -

private void hidekeyBoard() {
            InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(editChatBox.getWindowToken(), 0);
}

onCreate() 方法内部 -

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

   ArrayAdapter<String> chatQueAdapter = new ArrayAdapter<>(this,
            R.layout.chat_que_row, R.id.textChatQue, queArrays);
    myListView.setAdapter(chatQueAdapter);

        showKeyboard();
        heightOfKeyboard = getKeyboardHeight();
        hidekeyBoard();
        myListView.getLayoutParams().height = heightOfKeyboard;
        myListView.setVisibility(View.VISIBLE);
    }

Answer 1

我在 Root View 上添加了全局布局，并且能够将 ListView 的大小调整为与键盘相同的大小。

粉色框是调整大小的 ListView 。我已经在 2 台三星设备上测试了这个示例应用程序，它在两台设备上都运行良好。

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <EditText
        android:id="@+id/edt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:inputType="text"
        android:maxLines="1" />

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:visibility="gone" />
</LinearLayout>

Activity 类

import android.graphics.Rect;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import com.fet.minebeta.R;

public class ListActivity extends AppCompatActivity {

    PagerAdapter adapterViewPager;
    ViewPager viewPager;
    private int heightDiff;
    private ListView myListView;
    private EditText editChatBox;

    private boolean wasOpened;
    private final int DefaultKeyboardDP = 100;
    // Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff
    private final int EstimatedKeyboardDP = DefaultKeyboardDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);

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

        myListView = (ListView) findViewById(R.id.list);
        editChatBox = (EditText) findViewById(R.id.edt);

        //Listen for keyboard height change
        setKeyboardListener();

//        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
//        editChatBox.requestFocus();
//        inputMethodManager.showSoftInput(editChatBox, 0);
//
//        if (getCurrentFocus() != null) {
//            inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
//            inputMethodManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
//        }
//
//        getWindow().setSoftInputMode(
//                WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN
//        );
    }


    public final void setKeyboardListener() {

        final View activityRootView = ((ViewGroup) findViewById(android.R.id.content)).getChildAt(0);

        activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

            private final Rect r = new Rect();

            @Override
            public void onGlobalLayout() {
                // Convert the dp to pixels.
                int estimatedKeyboardHeight = (int) TypedValue
                        .applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, activityRootView.getResources().getDisplayMetrics());

                // Conclude whether the keyboard is shown or not.
                activityRootView.getWindowVisibleDisplayFrame(r);
                heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
                boolean isShown = heightDiff >= estimatedKeyboardHeight;

                if (isShown == wasOpened) {
                    Log.d("Keyboard state", "Ignoring global layout change...");
                    return;
                }

                wasOpened = isShown;

                if (isShown) {

                    //Set listview height
                    ViewGroup.LayoutParams params = myListView.getLayoutParams();
                    params.height = heightDiff;
                    myListView.setLayoutParams(params);
                    myListView.requestLayout();
                    myListView.setVisibility(View.VISIBLE);

                    Toast.makeText(ListActivity.this, "KeyBoard Open with height " + heightDiff +
                            "\n List View Height " + myListView.getHeight(), Toast.LENGTH_SHORT).show();

                }
            }
        });
    }
}

同样，这只是快速演示，您可以根据需要进行增强。