android开发步步为营之101:动态调整view的宽度和高度以及在页面的坐标位置

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.figo.study.activity.LayoutParametersActivity"
android:id="@+id/layout_main">

<TextView
android:id="@+id/txt_meme"
android:background="#80ff0000"
android:text="@string/hello_world" android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</RelativeLayout>

package com.figo.study.activity;

import android.app.ActionBar;
import android.graphics.Color;
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.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.figo.study.R;

public class LayoutParametersActivity extends AppCompatActivity {
TextView mTxtView;
RelativeLayout mRelativeLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_layout_parameters);
mRelativeLayout=(RelativeLayout)findViewById(R.id.layout_main);
mTxtView=(TextView)findViewById(R.id.txt_meme);
adjustWidthHeight(mTxtView,300,200);
addView();
adjustXY(mTxtView,100,500);
}
//调整控件宽度和高度
private void adjustWidthHeight(View v,int width,int height)
{
ViewGroup.LayoutParams lp=v.getLayoutParams();
lp.width=width;
lp.height=height;
v.setLayoutParams(lp);
}
//已有的view动态调整其left,top坐标
public  void adjustXY(View view,int x,int y)
{
ViewGroup.MarginLayoutParams margin=new ViewGroup.MarginLayoutParams(view.getLayoutParams());
margin.setMargins(x, y, x + margin.width, y + margin.height);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(margin);
view.setLayoutParams(layoutParams);
}
//动态添加的view调整其left,top坐标
private void addView()
{
ImageView imgText = new ImageView(LayoutParametersActivity.this);
imgText.setImageResource(R.mipmap.ic_launcher);
imgText.setBackgroundColor(Color.parseColor("#ffb6b6"));
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(100, 100);
layoutParams.topMargin=200;
layoutParams.leftMargin=100;
layoutParams.rightMargin=8;
layoutParams.bottomMargin=8;
mRelativeLayout.addView(imgText, layoutParams);
}

}