~~~ public class MainActivity extends AppCompatActivity { TextView txt; EditText eTxt; Button bt; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 創建線性布局 LinearLayout layout = new LinearLayout(this); // 布局管理器寬度為屏幕寬度 // 布局管理器高度為屏幕高度 LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); txt = new TextView(this); txt.setText("用戶名："); txt.setTextSize(20); layout.addView(txt,param); eTxt = new EditText(this); eTxt.setWidth(320); eTxt.setText("Hell Word"); eTxt.setTextSize(20); layout.addView(eTxt,param); bt = new Button(this); bt.setText("提交"); layout.addView(bt,param); //顯示布局管理器 super.addContentView(layout, param) ; } } ~~~