public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout layout = new LinearLayout(getApplicationContext());

        layout.setOrientation(LinearLayout.VERTICAL);
        TextView tv = new TextView(getApplicationContext());
        // tv.setText("代码创建UI");
//设置控件的显示特性
        tv.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));

        tv.setText("代码创建UI");
        Button bt = new Button(getApplicationContext());
        bt.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));
        bt.setText("show");

        layout.addView(tv);
        layout.addView(bt);
        super.setContentView(layout);
        bt.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(getApplicationContext(), "use code create UI", 1)
                        .show();
            }
        });

    }
}