我如何隐藏文本字段的上下文并在单击按钮时显示它我不想隐藏整个文本文件只是我在其中编写的上下文并在单击按钮时显示 ot 这是一个小代码*
package com.example.nonachan;
import android.R.string;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.TextView;
public class MainActivity extends Activity {
char a;
char b;
char c;
int i = 0;
char buf;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText t =(EditText)findViewById(R.id.t1);
ImageButton n = (ImageButton)findViewById(R.id.b1);
n.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
a = 'a';
t.setText(t.getText().toString() + a);
// t.setVisibility(View.INVISIBLE);
}
});
ImageButton a = (ImageButton)findViewById(R.id.b2);
a.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
b = 'b' ;
t.setText(t.getText().toString() + b);
// t.setVisibility(View.INVISIBLE);
i++;
}
});
ImageButton m = (ImageButton)findViewById(R.id.b4);
m.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
c = 'c' ;
t.setText(t.getText().toString() + c);
//t.setVisibility(View.INVISIBLE);
i++;
}
});
Button l = (Button)findViewById(R.id.b3);
l.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
// t.setVisibility(View.VISIBLE);
}
});
}
@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;
}
}