更改TextView文字颜色，引用Drawable颜色常数及后台色

package com.wzc.test;

import android.content.res.Resources;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TextView mTv1= (TextView) findViewById(R.id.tv_1);
        TextView mTv2= (TextView) findViewById(R.id.tv_2);
        mTv1.setText("我是应用Drawable后台色的戴维文本。");

        Resources resources = getBaseContext().getResources();
        Drawable HippoDrawable = resources.getDrawable(R.drawable.white);
        mTv1.setBackgroundDrawable(HippoDrawable);

        mTv2.setText("使用graphics.Color设置文本颜色");
        mTv2.setTextColor(Color.MAGENTA);

    }
}