Android编程之EditText常见操作示例

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);

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

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);
  }
}