Question

我有一个编辑文字和按钮

EditText edit=(EditText) findViewById(R.id.edittext);
Button btn=(Button) findViewById(R.id.btn);

btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Toast.makeText(context,edit.getText().toString(),Toast.LENGTH_SHORT).show();
edit.setText("hello");
}
}

但是当我点击按钮时，我可以通过“你好”（edittext的文本）获得祝酒词但edittext是空的。这是一个错误吗？

（编辑）这是我的完整代码 find =（EditText）rowView.findViewById（R.id.txtfindings）; finding.setOnClickListener（new OnClickListener（）{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new AlertDialog.Builder(context)
.setTitle("Findings")
.setMultiChoiceItems(
CustomDialog.service.getFindingsArray(), // array of string ex(cd,hard drive,motherboard)
_selectionsFindings, // boolean array size=size of findingsarray
new DialogSelectionClickHandler()) // set click handler on checkbox
.setPositiveButton("OK",
new DialogButtonClickHandler() //set button click
).create()
.show();
}
});

public class DialogSelectionClickHandler implements
DialogInterface.OnMultiChoiceClickListener {
public void onClick(DialogInterface dialog, int clicked,boolean selected) {
} }

public class DialogButtonClickHandler implements
        DialogInterface.OnClickListener {
    public void onClick(DialogInterface dialog, int clicked) {
        switch (clicked) {
        case DialogInterface.BUTTON_POSITIVE:
            printSelectedFinding();//call the function
            break;
        }
    }
}

protected void printSelectedFinding() {
    String textfinding = "";
    ArrayList<String> values = new ArrayList<String>(Arrays.asList(finding
            .getText().toString().split(","))); 
    if (!finding.getText().toString().equalsIgnoreCase("")) {
        if (!finding.getText().toString().substring(finding.getText().toString().length() - 1,
        finding.getText().toString().length()).equalsIgnoreCase(",")) {
            textfinding = ",";   //check if last character is == ,
        }
    }
    for (int i = 0; i < CustomDialog.service.getFindingsArray().length; i++) {
        if (_selectionsFindings[i]  //check which item is checked
                && !values.contains(CustomDialog.service.getFindingsArray()[i].trim())) { // check if edittext contains the text
            textfinding += CustomDialog.service.getFindingsArray()[i] + ","; // concatinate string
        }
    }
     finding.append(textfinding); // this where error happens finding is an edittext ex(textfinding = hard drive) finding should have "hard drive"
                    // but it is not displayed but when i use       getText() i can get "hard drive"
}

Answer 1

当我点击按钮时，我可以通过“你好”来获得祝酒词 edittext）但edittext为空。这是一个错误吗？

您正在使用

在editText中设置文本

 edit.setText("hello");

尝试删除它。

所以你的代码应该：

EditText edit=(EditText) findViewById(R.id.edittext);
Button btn=(Button) findViewById(R.id.btn);

btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Toast.makeText(context,edit.getText().toString(),Toast.LENGTH_SHORT).show();
//edit.setText("hello"); <====== comment this line and check
}
}

Answer 2

EditText edit=(EditText) findViewById(R.id.edittext);
Button btn=(Button) findViewById(R.id.btn);

btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
edit.setText("hello");
Toast.makeText(getApplicationContext(),edit.getText().toString(),Toast.LENGTH_SHORT).show();

}
}

现在应该工作.. cheerz

Answer 3

package com.example.edittext;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;

public class MainActivity extends Activity {
    EditText edit;
    Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edit=(EditText) findViewById(R.id.editText1);
        btn=(Button) findViewById(R.id.button1);

        btn.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v){
        Toast.makeText(getBaseContext(),edit.getText().toString(),Toast.LENGTH_SHORT).show();
        edit.setText("hello");
        }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

main.xml中

<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=".MainActivity" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="74dp"
        android:layout_marginTop="150dp"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_alignParentTop="true"
        android:layout_marginTop="61dp"
        android:text="Button" />

</RelativeLayout>

EditText getText但未显示

3 个答案: