100、布局转换成图片

package com.view.photo.demo;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity {
    private TextView txtName2 = null;
    private String PathUrl = Environment.getExternalStorageDirectory() + "/androidsj/";

    private void changeImage() {
        //将布局转换为View类型对象
        View view = getLayoutInflater().inflate(R.layout.activity_main, null);

        txtName2 = (TextView) view.findViewById(R.id.txtName2);
        txtName2.setText("肯德基，去你大爷22");

        //打开图像缓存
        view.setDrawingCacheEnabled(true);
        //必须调用measure和layout方法才能成功保存可视组件的截图到png图像文件
        //测量View大小
        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        //发送位置和尺寸到View及其所有的子View
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        try {
            File file = new File(PathUrl);
            if (!file.exists()) {
                file.mkdirs();
            }

            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
            String time = dateFormat.format(new Date());

            String BaoBaoUrl = PathUrl + time + ".png";
            File files = new File(BaoBaoUrl);

            //获得可视组件的截图
            Bitmap bitmap = view.getDrawingCache();
            //将截图保存在SD卡根目录的test.png图像文件中
            FileOutputStream fos = new FileOutputStream(files);
            //将Bitmap对象中的图像数据压缩成png格式的图像数据，并将这些数据保存在test.png文件中
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
            //关闭文件输出流
            fos.close();

        } catch (Exception e) {
            Log.i("TAG", "changeImage肿么办...." + e.getMessage());
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        changeImage();
    }
}