EditText软键盘弹出显示光标否则隐藏

分享 EditText 常用的用法，点击 EditText 获取焦点显示软键盘和光标否则隐藏，效果图如下：

代码如下：

public class MainActivity extends AppCompatActivity {
    private SoftKeyBoardListener softKeyBoardListener;
    private EditText editText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = findViewById(R.id.editText);

        setEditText();
        setListener();
    }

    /**
     * setEditText()
     * 1.第一次初始化EditText，失去焦点不显示软键盘
     * 2.软键盘显示/隐藏监听
     */
    private void setEditText() {
        //第一次初始化EditText，失去焦点不显示软键盘
        editText.setFocusable(false);
        editText.setFocusableInTouchMode(false);
        editText.setCursorVisible(false);
        //软键盘显示/隐藏监听
        softKeyBoardListener = new SoftKeyBoardListener(this);
        softKeyBoardListener.setListener(new SoftKeyBoardListener.OnSoftKeyBoardChangeListener() {
            @Override
            public void keyBoardShow(int height) {
                editText.setFocusable(true);
                editText.setFocusableInTouchMode(true);
                editText.setCursorVisible(true);
            }

            @Override
            public void keyBoardHide(int height) {
                editText.setFocusable(false);
                editText.setFocusableInTouchMode(false);
                editText.setCursorVisible(false);
            }
        });
    }

    /**
     * setListener()
     * 1.设置点击事件,显示软键盘
     * 2.防止EditText点击两次才获取到焦点
     */
    private void setListener() {
        //设置点击事件,显示软键盘
        editText.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                InputMethodManager manager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                manager.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
            }
        });
        //防止EditText点击两次才获取到焦点
        editText.setOnTouchListener(new View.OnTouchListener() {
            //按住和松开的标识
            int flag = 0;

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                flag++;
                if (flag == 2) {
                    flag = 0;//不要忘记这句话
                    //处理逻辑
                    editText.setFocusable(true);
                    editText.setFocusableInTouchMode(true);
                    editText.setCursorVisible(true);
                }
                return false;
            }
        });
    }
}

上面注释很清楚了，下面是监听软键盘的工具类 SoftKeyBoardListener ：

/**
 * author: wu
 * date: on 2019/1/21.
 * describe:
 */
public class SoftKeyBoardListener {
    private View rootView;//activity的根视图
    int rootViewVisibleHeight;//纪录根视图的显示高度
    private OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener;

    public SoftKeyBoardListener(Activity activity) {
        //获取activity的根视图
        rootView = activity.getWindow().getDecorView();

        //监听视图树中全局布局发生改变或者视图树中的某个视图的可视状态发生改变
        rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                //获取当前根视图在屏幕上显示的大小
                Rect r = new Rect();
                rootView.getWindowVisibleDisplayFrame(r);
                int visibleHeight = r.height();
                if (rootViewVisibleHeight == 0) {
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }

                //根视图显示高度没有变化，可以看作软键盘显示／隐藏状态没有改变
                if (rootViewVisibleHeight == visibleHeight) {
                    return;
                }

                //根视图显示高度变小超过200，可以看作软键盘显示了
                if (rootViewVisibleHeight - visibleHeight > 200) {
                    if (onSoftKeyBoardChangeListener != null) {
                        onSoftKeyBoardChangeListener.keyBoardShow(rootViewVisibleHeight - visibleHeight);
                    }
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }

                //根视图显示高度变大超过200，可以看作软键盘隐藏了
                if (visibleHeight - rootViewVisibleHeight > 200) {
                    if (onSoftKeyBoardChangeListener != null) {
                        onSoftKeyBoardChangeListener.keyBoardHide(visibleHeight - rootViewVisibleHeight);
                    }
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }

            }
        });
    }

    private void setOnSoftKeyBoardChangeListener(OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        this.onSoftKeyBoardChangeListener = onSoftKeyBoardChangeListener;
    }

    public interface OnSoftKeyBoardChangeListener {
        void keyBoardShow(int height);

        void keyBoardHide(int height);
    }

    public void setListener(OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        setOnSoftKeyBoardChangeListener(onSoftKeyBoardChangeListener);
    }
}

这样就可以实现上面的效果了。