android电话拨号

public class Phone extends Activity {
private MultiAutoCompleteTextView mu = null;
private Button button = null;
private static final String Array[] = new String[]{"15189727317","15189730596","awer","wesasas","abccdscd"};
private String num = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_phone);
        
        mu = (MultiAutoCompleteTextView)findViewById(R.id.mu);
        button = (Button)findViewById(R.id.mybutton);
        
        ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line, Array);
        mu.setAdapter(adapter);
        mu.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());


        
        button.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
Intent intent = new Intent();
num = "tel:" + mu.getText().toString();
intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse(num));
Phone.this.startActivity(intent);
}
});
    }
}