Question

我是初学者。

我想从edittext中提供值并将其设置为按钮文本。当编辑文本和按钮处于不同的活动中时（可以使用意图和附加内容），我可以这样做，但是当他们处于相同的活动时呢？

这是我到目前为止的代码（我使用对话框获取edittext值，edittext在“addalbumsdialog”布局中）：

public class Albums extends Activity {
Button b1;
EditText et1;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.album);

    Button b2 = (Button) findViewById(R.id.addalbum);

    b2.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            startDialog();
        }
    });
}

protected void startDialog() {
    AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(this);
    LayoutInflater inflater = this.getLayoutInflater();
    et1 = (EditText) findViewById(R.id.editText1);
    myAlertDialog.setTitle("Name?");
    myAlertDialog.setView(inflater.inflate(R.layout.addalbumsdialog, null));
    myAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface arg0, int arg1) {
            b1 = (Button) findViewById(R.id.album1);
            b1.setText(et1.getText().toString());
            b1.setVisibility(View.VISIBLE);

        }
    });
    myAlertDialog.show();
}

}

感谢。

Answer 1

您需要更改

 View view = (View) inflater.inflate(R.layout.addalbumsdialog, null);
 myAlertDialog.setView(view);       
 et1 = (EditText) view.findViewById(R.id.editText1);
 myAlertDialog.setTitle("Name?");

将Button声明为实例变量

Button b2;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.album);
b2 = (Button) findViewById(R.id.addalbum);

然后点击按钮

 @Override
 public void onClick(DialogInterface arg0, int arg1) {
        b2.setText(et1.getText().toString();

    }
});

如果按钮b1属于充气的视图，则需要将文本设置为

然后

protected void startDialog() {
AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(this);
View view = (View) inflater.inflate(R.layout.addalbumsdialog, null);
myAlertDialog.setView(view);       
et1 = (EditText) view.findViewById(R.id.editText1);
b1 = (Button) view.findViewById(R.id.album1);
myAlertDialog.setTitle("Name?");
myAlertDialog.setView(inflater.inflate(R.layout.addalbumsdialog, null));
myAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface arg0, int arg1) {
        b1.setVisibility(View.VISIBLE);
        b1.setText(et1.getText().toString());

    }
});
myAlertDialog.show();
}

您尚未提及要更改的按钮文字。所以发布了两个

Answer 2

你应该替换这个

  LayoutInflater inflater = this.getLayoutInflater();
  et1 = (EditText) findViewById(R.id.editText1);
  myAlertDialog.setTitle("Name?");
  myAlertDialog.setView(inflater.inflate(R.layout.addalbumsdialog, null));

使用

View view = (View) inflater.inflate(R.layout.addalbumsdialog, null);
myAlertDialog.setView(view);       
et1 = (EditText) view.findViewById(R.id.editText1);
b1 = (Button) view.findViewById(R.id.album1);
myAlertDialog.setTitle("Name?");

将create Button b2添加为实例变量，如：

Button b2;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.album);
b2 = (Button) findViewById(R.id.addalbum);

然后点击按钮

@Override
 public void onClick(DialogInterface arg0, int arg1) {
    b2.setText(et1.getText().toString();

  }
});

Answer 3

替换像这样的代码

public class Albums extends Activity {
    Button b1;
    EditText et1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.album);

        Button b2 = (Button) findViewById(R.id.addalbum);
        b1 = (Button) findViewById(R.id.album1);

        b2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                startDialog();
            }
        });
    }

    protected void startDialog() {
        AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(this);
        LayoutInflater inflater = this.getLayoutInflater();
        et1 = (EditText) findViewById(R.id.editText1);
        myAlertDialog.setTitle("Name?");
        myAlertDialog.setView(inflater.inflate(R.layout.addalbumsdialog, null));
        myAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface arg0, int arg1) {           
                b1.setText(et1.getText().toString());


            }
        });
        myAlertDialog.show();
    }

    }

如何在一个活动中使用Edittext Value重命名Button？

3 个答案: