关于在EditText 中监听软键盘的弹出和退出

              在我们实际的开发过程中，往往要监听软键盘的弹出和退出动作，这个我提供一个方法。很有效我试过了。

复写EditText

package com.mstar.test;

import android.content.Context;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

public class EditTextSpuer extends EditText{
private Context mContext;
InputMethodManager imm;
 public EditTextSpuer(Context context) {
  super(context);
   this.mContext = context;
  // TODO Auto-generated constructor stub
 }
 
 public boolean onKeyDown(int keyCode, KeyEvent event) {
 
    if (keyCode == KeyEvent.KEYCODE_ENTER ) {
           
            Log.v("xpf","--------------------+onKeyDown---------软键盘弹出");
        }
   return super.onKeyDown(keyCode, event);
 }

  public boolean onKeyPreIme (int keyCode, KeyEvent event){
  
 
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN ) {
          
           Log.v("xpf","--------------------+onKeyPreIme---------软键盘退出");
       }

    return super.onKeyPreIme(keyCode, event);
  }
  
}

 

activity 内容：

package com.mstar.test;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.KeyEvent;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.*;

public class EditTextTest extends Activity {
  
 private LinearLayout mainLayout=null;
 private RelativeLayout layout=null; 
 private TextView tv1=null;  //标题  
 private TextView tv2=null;  //可输入剩余字符数
 private EditText et=null;  //输入框  
 InputMethodManager imm;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mainLayout_init();
        setContentView(mainLayout);
                 
    }
  
    /*mainLayout初始化*/
    void mainLayout_init(){
     mainLayout=new LinearLayout(this);
     LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -1);
     mainLayout.setLayoutParams(lp);
     mainLayout.setOrientation(LinearLayout.VERTICAL);
     layout_init();
     mainLayout.addView(layout);
     et_init();
     mainLayout.addView(et);
    }
    /*layout1初始化*/
    void layout_init(){
     layout=new RelativeLayout(this);
     RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-1, -2);
     layout.setLayoutParams(lp);
     tv1_init();
     layout.addView(tv1);
     tv2_init();
     layout.addView(tv2);
    }
    /*tv11初始化*/
    void tv1_init(){
     tv1=new TextView(this);
     RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2, -2);
     lp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
     tv1.setLayoutParams(lp);
     tv1.setTextSize(30);
     tv1.setText("请输入账号:");
    }
    /*tv12初始化*/
    void tv2_init(){
     tv2=new TextView(this);
     RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2, -2);
     lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
     tv2.setLayoutParams(lp);
     tv2.setTextSize(30);
     tv2.setText("12");
    }
    /*et1初始化*/
    void et_init(){
     et=new EditTextSpuer(this){
            public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
              Log.v("xpf", "onCreateInputConnection-------------");
                return new TestInputConnection(super.onCreateInputConnection(outAttrs),
 
                                false);
 
        }

           
        };
     LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-2);
     et.setLayoutParams(lp);
     et.setSingleLine(true);
     //字符变化监听
     TextWatcher tw=new TextWatcher(){
   public void afterTextChanged(Editable s) {
    //限制输入，最多允许输入12个
    if(et.length()>12){
     //截取字符串，舍弃最后一个
     et.setText((et.getText()).subSequence(0, 12));
     //设置光标。由于用setText函数会导致光标复位，所以重新设置光标到末尾
     et.setSelection(12);
    }
    //显示剩余可输入字符数
    tv2.setText(String.valueOf(12-et.length()));
   }
   public void beforeTextChanged(CharSequence s, int start, int count,int after) {}
   public void onTextChanged(CharSequence s, int start, int before,int count) {}
     };
     et.addTextChangedListener(tw);
    }
}