android TextView 设置字体大小

package com.example.yanlei.yl4;

import android.graphics.Color;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.text.Spannable;import android.text.style.AbsoluteSizeSpan;import android.text.style.BackgroundColorSpan;import android.text.style.StyleSpan;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    TextView edit;    Button sendBu;

    @Override

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

        edit = (TextView) findViewById(R.id.textView);        sendBu = (Button) findViewById(R.id.button);        sendBu.setOnClickListener(new ButtonClickListener());    }

    private class ButtonClickListener implements View.OnClickListener {

        public void onClick(View v) {            //System.exit(0);            edit.setText("闫磊我爱你");            edit.setTextColor(Color.BLUE);

            edit.setText("这是我的第一个TextView，嘿嘿", TextView.BufferType.EDITABLE);/** * 要设置文本的背景色， * 必须将文本设置成BufferType.SPANNABLE,BufferType.EDITABLE */            Spannable sp = (Spannable) edit.getText();//设置红色背景            sp.setSpan(new BackgroundColorSpan(Color.RED), 3, 8,                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            sp.setSpan(new StyleSpan(android.graphics.Typeface.BOLD_ITALIC),                    0, 7, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);   //设置斜体            sp.setSpan(new AbsoluteSizeSpan(80), 0, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); //设置字体大小            edit.setText(sp);

            //edit.setHeight(60);            //android.os.Process.killProcess(android.os.Process.myPid());        }    }

    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.menu_main, menu);        return true;    }

    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();

        //noinspection SimplifiableIfStatement        if (id == R.id.action_settings) {            return true;        }

        return super.onOptionsItemSelected(item);    }}