将图片缓存sdCard上，展示页面并删…

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package com.bwie.zhangyuke20170913;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    privateImageView ivIcon;
    privateButton bt_qc;
    privateButton bt_add;
    privateButton bt_hc;
    privateString path;
    private Filefile;

   @Override
    protectedvoid onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       bt_hc = (Button) findViewById(R.id.bt_hc);
       bt_add = (Button) findViewById(R.id.bt_add);
       bt_qc = (Button) findViewById(R.id.bt_qc);
       ivIcon = (ImageView) findViewById(R.id.ivIcon);
       try {
           //路径
           path = Environment.getExternalStorageDirectory() + "/tu.png";
           file = new File(path);

       } catch (Exception e) {
           e.printStackTrace();
       }

       //向sdCard缓存
       bt_hc.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
               Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher);
               if (!file.exists()){
                   try {
                       file.createNewFile();
                       FileOutputStream fos=new FileOutputStream(file);
                       bitmap.compress(Bitmap.CompressFormat.PNG,50,fos);
                       Toast.makeText(MainActivity.this, "缓存成功",Toast.LENGTH_SHORT).show();
                       fos.close();

                   } catch (Exception e) {
                       e.printStackTrace();
                   }
               }

           }
       });
       //从SdCard取出图片
       bt_add.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
               if (file.exists()){
                   Bitmap bitmap = BitmapFactory.decodeFile(path);
                   ivIcon.setImageBitmap(bitmap);
               }
           }
       });
       //删除图片
       bt_qc.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
               file.delete();
               Bitmap bitmap = BitmapFactory.decodeFile(path);
               ivIcon.setImageBitmap(bitmap);
           }
       });

}
}

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