在java代码中设置控件的margin 属性 及 button点击切换背景

一、在java代码中设置控件的margin 属性：

private LinearLayout.LayoutParams  lp = new LinearLayout.LayoutParams( 
LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT); 
lp.setMargins(5, 5, 0, 0);

     text.setLayoutParams(lp);

二、按钮点击换背景：

public class Test extends Activity {    ImageView iv;    boolean isChanged = false;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);         iv = (ImageView)findViewById(R.id.imageView1);        iv.setOnClickListener(new View.OnClickListener() {                        @Override            public void onClick(View v) {                // TODO Auto-generated method stub                if(v == iv)                {                    if(isChanged){                        iv.setImageDrawable(getResources().getDrawable(R.drawable.icon));                    }else                    {                        iv.setImageDrawable(getResources().getDrawable(R.drawable.png1));                    }                    isChanged = !isChanged;                                    }            }        });    }}