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

          第一步、页面设计

          第二步、Activity设计

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);
    }

}