输入时在EditText中清除文本

Question

我试图设置onclicklistener，这样当我点击edittext元素时，它将清除它的当前内容。这里有什么不对吗？当我编译这段代码时，我得到一个强制退出和ActivityManager：无法调度DDM块4d505251：没有处理程序定义的错误。

public class Project extends Activity implements OnClickListener { 
    /** Called when the activity is first created. */ 
    EditText editText = (EditText)findViewById(R.id.editText1); 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 


     editText.setOnClickListener(this); 

     setContentView(R.layout.main); 

    } 

    @Override 
    public void onClick(View v) { 
     // TODO Auto-generated method stub 
     editText.setText(""); 
    } 
} 

Answer 1

首先你需要调用setContentView(R.layout.main)然后所有其他的初始化。

请尝试以下代码。

public class Trackfolio extends Activity implements OnClickListener { 
    /** Called when the activity is first created. */ 
    public EditText editText; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.main); 

     editText = (EditText) findViewById(R.id.editText1); 
     editText.setOnClickListener(this); 
    } 

    @Override 
    public void onClick(View v) { 
     editText.setText(""); 
    } 
} 

Answer 2

你的代码应该是：

public class Project extends Activity implements OnClickListener { 
      /** Called when the activity is first created. */ 
      EditText editText; 
      @Override 
      public void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState);    

       setContentView(R.layout.main); 
       editText = (EditText)findViewById(R.id.editText1); 
       editText.setOnClickListener(this);    
      } 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 

       if(v == editText) { 
        editText.setText(""); 
       } 
      } 
     } 

Answer 3

public EditText editField; 
public Button clear = null; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
    setContentView(R.layout.text_layout); 
    this. editField = (EditText)findViewById(R.id.userName); 
this.clear = (Button) findViewById(R.id.clear_button); 
this.editField.setOnClickListener(this); 
this.clear.setOnClickListener(this); 
@Override 
public void onClick(View v) { 

    // TODO Auto-generated method stub 
if(v.getId()==R.id.clear_button){ 
//setText will remove all text that is written by someone 
    editField.setText(""); 
    } 
} 

Answer 4

我不知道我做了什么错误，在实施上述解决方案，BT尝试失败对我来说

txtDeck.setOnFocusChangeListener(new OnFocusChangeListener() { 
    @Override  
    public void onFocusChange(View v, boolean hasFocus) { 
     txtDeck.setText(""); 
    } 
}); 

这适用于我，

Answer 5

也可以使用下面

editText.getText().clear(); 

Answer 6

//要清除当清除按钮被点击

的firstName =（的EditText）findViewById（R.id.firstName）的代码;

clear = (Button) findViewById(R.id.clearsearchSubmit); 

    clear.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      if (v.getId() == R.id.clearsearchSubmit); 
      firstName.setText(""); 
     } 
    }); 

这将有助于清除您在键入再次按Backspace键，这样，而不是错误的关键字，再只需单击按钮，清除everything.It为我工作。希望它可以帮助

Answer 7

只需在EditText中使用android:hint属性。当文本框为空且未聚焦时，此文本显示，但在选择EditText框时消失。

Answer 8

package com.example.sampleproject; 

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

public class SampleProject extends Activity { 
    EditText mSearchpeople; 
    Button mCancel , msearchclose; 
    ImageView mprofile, mContact, mcalender, mConnection, mGroup , mFollowup , msetting , mAddacard; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.dashboard); 
     mSearchpeople = (EditText)findViewById(R.id.editText1); 
     mCancel = (Button)findViewById(R.id.button2); 
     msearchclose = (Button)findViewById(R.id.button1); 
     mprofile = (ImageView)findViewById(R.id.imageView1); 
     mContact = (ImageView)findViewById(R.id.imageView2); 
     mcalender = (ImageView)findViewById(R.id.imageView3); 
     mConnection = (ImageView)findViewById(R.id.imageView4); 
     mGroup = (ImageView)findViewById(R.id.imageView5); 
     mFollowup = (ImageView)findViewById(R.id.imageView6); 
     msetting = (ImageView)findViewById(R.id.imageView7); 
     mAddacard = (ImageView)findViewById(R.id.imageView8); 
    } 
    @Override 
    protected void onResume() { 
     // TODO Auto-generated method stub 
     super.onResume(); 
     mCancel.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       mSearchpeople.clearFocus(); 

      } 
     }); 
    } 


} 

Answer 9

非常简单的清除editText values.when你点击按钮，然后只遵循1行代码。

内部按钮或任何üwant.Only使用

editText.setText(""); 

Answer 10

final EditText childItem = (EditText) convertView.findViewById(R.id.child_item); 
childItem.setHint(cellData); 

childItem.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
    @Override 
    public void onFocusChange(View v, boolean hasFocus) { 
     //Log.d("NNN", "Has focus " + hasFocus); 
     if (hasFocus) { 
      Toast.makeText(ctx.getApplicationContext(), "got the focus", Toast.LENGTH_LONG).show(); 
     } else { 
      Toast.makeText(ctx.getApplicationContext(), 
      "loss the focus", Toast.LENGTH_SHORT).show(); 
     } 
     return; 
    }); 

Answer 11

通过设置空字符串就可以全部清除您的EditText

editext.setText("");