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我試圖在單擊底部後替換文本的一部分,但我無法使其工作。當我在沒有輸入名字的情況下單擊底部時,消息應該顯示「你好用戶名」,如果我輸入一個名稱,「用戶名」應該用名稱替換。這是目前的代碼。由於Android Studio Java代碼
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;
public class HelloAndroid extends AppCompatActivity implements OnClickListener {
private EditText name;
private TextView display;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hello_android);
name = (EditText) findViewById(R.id.name);
display = (TextView) findViewById(R.id.display);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_hello_android, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View view) {
if (button == view) {
String message = "Hello, Username " + name.getText().toString() + "!";
if (button == view) {
String username = "Hello " + name.getText().toString() + "";
Toast toast = Toast.makeText(this, message, Toast.LENGTH_SHORT);
toast.show();
display.setText(message);
}
}
}
}
太謝謝你了。這非常有幫助 – user7016950