android edittext操作

1.获取光标选中的文字

EditText view = (EditText)findViewById(R.id.edt);

int start = view.getSelectionStart();

int end = view.getSelectionEnd();

//由于选择的位置和你开始选择文字的顺序有关，所以最好重新判断整理一下顺序，免得出错

if (start>end) {
start = start + end ;
end = start - end;
start = start - end;
}

String sub = view .getText() .toString().substring(start, end);

2.设置光标在输入框的位置

在编写应用的时候，如果我们要将光标定位到某个位置，可以采用下面的方法：

 CharSequence text = editText.getText(); //Debug.asserts(text instanceof Spannable); if (text instanceof Spannable) {     Spannable spanText = (Spannable)text;     Selection.setSelection(spanText, text.length()); }

其中红色标记的代码为你想要设置的位置，此处是设置到文本末尾。

3 在指定位置插入字符串

public class EditTextCopyActivity extends Activity {
/** Called when the activity is first created. */
private EditText et1 ,et2,et3,et4,et5,et6,et7;
private Button bt1,bt2,bt3;
private ClipboardManager clip ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initViews();

bt1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {

View view = getCurrentFocus();
if (view instanceof EditText) {
EditText et = (EditText)view;
int start = et.getSelectionStart();
int end = et.getSelectionEnd();
if (start>end) {
start = start + end ;
end = start - end;
start = start - end;
}
String sub = et.getText().toString().substring(start, end);
clip.setText(sub);
}
}
});

bt2.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
View view = getCurrentFocus();
if (view instanceof EditText) {
EditText et = (EditText)view;
int start = et.getSelectionStart();
System.out.println(start+"--------------");
String s = clip.getText().toString();
et.getText().insert(start,s);
}
}
});

bt3.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
View view = getCurrentFocus();
if (view instanceof EditText) {
EditText et = (EditText)view;
int start = et.getSelectionStart();
int end = et.getSelectionEnd();
if (start>end) {
start = start + end ;
end = start - end;
start = start - end;
}
String sub = et.getText().toString().substring(start, end);
et.getText().delete(start, end);
clip.setText(sub);
}
}

});

}
private void initViews(){
et1 = (EditText)this.findViewById(R.id.editText1);
et2 =(EditText)this.findViewById(R.id.editText2);
et3 =(EditText)this.findViewById(R.id.editText3);
et4 =(EditText)this.findViewById(R.id.editText4);
et5 =(EditText)this.findViewById(R.id.editText5);
et6 =(EditText)this.findViewById(R.id.editText6);
clip = (ClipboardManager)getSystemService(CLIPBOARD_SERVICE);
bt1=(Button)this.findViewById(R.id.button1);
bt2 = (Button)this.findViewById(R.id.button2);
bt3 = (Button)this.findViewById(R.id.button3);
}

}

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