Android API之TextView.BufferType代码演示

private TextView textView1,textView2,textView3;

private EditText editText1,editText2;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//main.xml中定义的UI组件

textView1=(TextView)findViewById(R.id.textView1);

textView2=(TextView)findViewById(R.id.textView2);

textView3=(TextView)findViewById(R.id.textView3);

editText1=(EditText)findViewById(R.id.editText1);

editText2=(EditText)findViewById(R.id.editText2);

//设置textView1为TextView.BufferType.NORMAL

textView1.setText(textView1.getText(),TextView.BufferType.NORMAL);

textView1.append(" Append from textView1");

//设置textView2为TextView.BufferType.EDITABLE

textView2.setText(textView2.getText(), TextView.BufferType.EDITABLE);

textView2.append(" Append from textView2");

//设置textVIew3中Text内容的起始和终止需处理字符的索引位置

int start=(textView3.getText()).toString().indexOf('i');

int end=(textView3.getText()).toString().indexOf('V');

//设置textView3为TextView.BufferType.SPANNABLE

textView3.setText(R.string.textView3, TextView.BufferType.SPANNABLE);

Spannable span=(Spannable)textView3.getText();

span.setSpan(newBackgroundColorSpan(Color.BLUE), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

span.setSpan(newStyleSpan(Typeface.BOLD_ITALIC),start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置editText1为TextView.BufferType.SPANNABLE

editText1.setText(editText1.getText(),TextView.BufferType.SPANNABLE);

Spannable span1=(Spannable)editText1.getText();

span1.setSpan(newBackgroundColorSpan(Color.RED), 2, 5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

}

@Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

//修改editText2内容后，将通过SharedPreferences保存，保证程序重启后数据持久存在

SharedPreferences prefs=getPreferences(0);

String restore=prefs.getString("text", null);

if(restore!=null){

//设置editText2为TextView.BufferType.EDITABLE

editText2.setText(restore,TextView.BufferType.EDITABLE);

intstart=prefs.getInt("start", -1);

intend=prefs.getInt("end", -1);

if(start !=-1 && end!=-1){

editText2.setSelection(start, end);

}

}

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

super.onPause();

SharedPreferences.Editor editor=getPreferences(0).edit();

editor.putString("text", editText2.getText().toString());

editor.putInt("start", editText2.getSelectionStart());

editor.putInt("end", editText2.getSelectionEnd());

editor.commit();

}