Android 中使用EditText 点击全选再次点击取消全选功能

android:focusable="true"android:selectAllOnFocus="true"

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  tools:context="com.example.edittexttest.MainActivity">  <EditText    android:id="@+id/edit"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:focusable="true"    android:selectAllOnFocus="true"    /></RelativeLayout>

package com.example.edittexttest;import android.content.Context;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.inputmethod.InputMethodManager;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends AppCompatActivity {  private EditText editText;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    editText = (EditText) findViewById(R.id.edit);    editText.setText("click to select all");    editText.clearFocus();    editText.setFocusableInTouchMode(false);    editText.setOnTouchListener(new View.OnTouchListener() {      @Override      public boolean onTouch(View view, MotionEvent motionEvent) {        if (motionEvent.getAction() == MotionEvent.ACTION_UP) {          editText.setFocusableInTouchMode(true);          editText.requestFocus();          editText.setText("click to select all");          editText.selectAll();        }        return false;      }    });  }  @Override  public boolean dispatchTouchEvent(MotionEvent ev) {    if (ev.getAction() == MotionEvent.ACTION_DOWN) {      View v = getCurrentFocus();      if (isShouldHideInput(v, ev)) {        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);        if (imm.isActive()) {          imm.hideSoftInputFromWindow(v.getWindowToken(), 0);        }      }      return super.dispatchTouchEvent(ev);    }    // Necessary    if (getWindow().superDispatchTouchEvent(ev)) {      return true;    }    editText.clearFocus();    editText.setFocusableInTouchMode(false);    return onTouchEvent(ev);  }  public boolean isShouldHideInput(View v, MotionEvent event) {    if (v != null && (v instanceof EditText)) {      int[] leftTop = { 0, 0 };      //get location of TextView      v.getLocationInWindow(leftTop);      int left = leftTop[0];      int top = leftTop[1];      int bottom = top + v.getHeight();      int right = left + v.getWidth();      if (event.getX() > left && event.getX() < right          && event.getY() > top && event.getY() < bottom) {        return false;      } else {        return true;      }    }    return false;  }}

editText.setFocusableInTouchMode(true);editText.requestFocus();