android监听软键盘的弹出与隐藏的示例代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  android:id="@+id/activity_main"
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  android:fitsSystemWindows="true"
  tools:context="com.test.myapplication.MainActivity">

  <TextView
    android:layout_margin="10dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"/>

  <LinearLayout
    android:id="@+id/lin"
    android:background="#0000ff"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1">
    <ScrollView
      android:layout_width="match_parent"
      android:layout_height="match_parent">
      <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <EditText
          android:layout_width="match_parent"
          android:layout_height="wrap_content"/>
      </LinearLayout>
    </ScrollView>
  </LinearLayout>
  <TextView
    android:layout_margin="10dp"
    android:id="@+id/txt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"/>
</LinearLayout>

if(getWindow().getAttributes().softInputMode==WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED)
    {
     //隐藏软键盘
      getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
    }

public class ResizeLayout extends LinearLayout {
  private InputListener mListener;

  public interface InputListener {
    void OnInputListener(boolean isHideInput);
  }

  public void setOnResizeListener(InputListener l) {
    mListener = l;
  }

  public ResizeLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  private boolean mHasInit = false;
  private boolean mHasKeyboard = false;
  private int mHeight;

  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    // TODO Auto-generated method stub
    super.onLayout(changed, l, t, r, b);
    if (!mHasInit) {
      mHasInit = true;
      mHeight = b;
      System.out.println("mHeight= " + b);
    }
    else {
      mHeight = mHeight < b ? b : mHeight;
    }

    if (mHasInit && mHeight > b) { // mHeight代表键盘的真实高度 ,b代表在窗口中的高度 mHeight>b
      mHasKeyboard = true;
      mListener.OnInputListener(false);
    }
    if (mHasInit && mHasKeyboard && mHeight == b) { // mHeight = b
      mHasKeyboard = false;
      mListener.OnInputListener(true);
    }
  }

@Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    /*// 隐藏标题栏
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    // 隐藏状态栏
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);*/
    setContentView(R.layout.activity_main);
    final LinearLayout lin = (LinearLayout) findViewById(R.id.lin);
    final TextView txt = (TextView) findViewById(R.id.txt);

    lin.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
      @Override
      public void onGlobalLayout() {
        Rect rect = new Rect();
        lin.getWindowVisibleDisplayFrame(rect);
        int rootInvisibleHeight = lin.getRootView().getHeight() - rect.bottom;
        Log.d(TAG, "lin.getRootView().getHeight()=" + lin.getRootView().getHeight() + ",rect.bottom=" + rect.bottom + ",rootInvisibleHeight=" + rootInvisibleHeight);
        if (rootInvisibleHeight <= 100) {
        //软键盘隐藏啦
          txt.postDelayed(new Runnable() {
            @Override
            public void run() {
              txt.setVisibility(View.VISIBLE);
            }
          },100);
        } else {
          ////软键盘弹出啦
          txt.setVisibility(View.GONE);
        }
      }
    });
  }