Android登陆界面实现清除输入框内容和震动效果

本文为大家分享Android登陆界面实现清除输入框内容和震动效果的全部代码，具体内容如下：

效果图：

主要代码如下

自定义的一个EditText，用于实现有文字的时候显示可以清楚的按钮：

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;

public class ClearEditText extends EditText implements View.OnFocusChangeListener,TextWatcher{

   //删除按钮的引用
  private Drawable mClearDrawable;

  //控件是否有焦点
  private boolean hasFoucs;

  public ClearEditText(Context context) {
    this(context, null);
  }

  public ClearEditText(Context context, AttributeSet attrs) {
    // 这里构造方法也很重要，不加这个很多属性不能再XML里面定义
    this(context, attrs, android.R.attr.editTextStyle);
  }

  public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
  }

   private void init() {
      //获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
      mClearDrawable = getCompoundDrawables()[2];
      if (mClearDrawable == null) {
 // throw new NullPointerException("You can add drawableRight attribute in XML");
 mClearDrawable = getResources().getDrawable(R.drawable.selector_ic_delete);
      }

      //getIntrinsicWidth()取得的是Drawable在手机上的宽度，所以不同分辨率下获取到的值是不同的，关键所在处
      mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());

      //默认设置隐藏图标
      setClearIconVisible(false);
      //设置焦点改变的监听
      setonFocusChangeListener(this);
      //设置输入框里面内容发生改变的监听
      addTextChangedListener(this);
    }

    
    @Override
    public boolean onTouchEvent(MotionEvent event) {
      if (event.getAction() == MotionEvent.ACTION_UP) {
 if (getCompoundDrawables()[2] != null) {

   boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
&& (event.getX() < ((getWidth() - getPaddingRight())));

   if (touchable) {
     this.setText("");
   }
 }
      }

      return super.onTouchEvent(event);
    }

    
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
      this.hasFoucs = hasFocus;
      if (hasFocus) {
 setClearIconVisible(getText().length() > 0);
      } else {
 setClearIconVisible(false);
      }
    }


    
    protected void setClearIconVisible(boolean visible) {
      Drawable right = visible ? mClearDrawable : null;
      setCompoundDrawables(getCompoundDrawables()[0],
   getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }


    
    @Override
    public void onTextChanged(CharSequence s, int start, int count,int after) {
      if(hasFoucs){
 setClearIconVisible(s.length() > 0);
      }
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,int after) {

    }

    @Override
    public void afterTextChanged(Editable s) {

    }


    
    public void setShakeAnimation(){
      this.setAnimation(shakeAnimation(5));
    }

    
    public static Animation shakeAnimation(int counts){
      Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
      translateAnimation.setInterpolator(new CycleInterpolator(counts));
      translateAnimation.setDuration(1000);
      return translateAnimation;
    }
}

MainActivity.java 主要是弹出一句话表示按钮的点击事件

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.app.Activity;

public class MainActivity extends Activity {

  private Button btnLogin;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    btnLogin = (Button) this.findViewById(R.id.btnLogin);
  }

  public void login(View view) {
    Toast.makeText(this, "登陆", Toast.LENGTH_LONG).show();

  }
}

布局文件如下：

另外还有一些selector文件，图片资源等：
bg_btn_style_green.xml

bg_edittext_selector.xml

以上就是本文的全部内容，希望对大家学习Android软件编程有所帮助。