试下这个.

publicclassMyTextViewextends Activity {

private TextView mTextView；//声明TextView对象

/** Called when the activity is first created. */

Override

publicvoid onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mTextView = (TextView)findViewById(R.id.tv)；//取得TextView对象

mTextView.setText（＂我的第一个文本＂）；//设置TextView显示的内容

mTextView.setTextColor(Color.GREEN)；//设置TextView的颜色

mTextView.setBackgroundColor(Color.WHITE)；//设置TextView的背景色

}

}