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

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第一步、页面设计

<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>

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);    }}

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