JAVA

package com.example.lenovo.lianxiyong;import android.content.res.AssetManager;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.ImageView;import android.widget.Toast;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.PrintStream;import java.util.Enumeration;public class ShoujicunchuActivity extends AppCompatActivity {    ImageView iv1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_shoujicunchu);        iv1=(ImageView)findViewById(R.id.iv1);    }    public void bt_1(View v)    {        try {            AssetManager assetManager = getAssets();            InputStream inputStream = assetManager.open("nnn.jpg");            FileOutputStream fileOutputStream = openFileOutput("ttt.jpg", MODE_PRIVATE);            byte[]b=new byte[1024];            int i=0;            while ((i=inputStream.read(b))>0)            {                fileOutputStream.write(b,0,i);            }            fileOutputStream.close();            inputStream.close();            Toast.makeText(ShoujicunchuActivity.this, "保存成功", Toast.LENGTH_SHORT).show();        }        catch (Exception e)        {            Toast.makeText(ShoujicunchuActivity.this, "保存失败", Toast.LENGTH_SHORT).show();        }    }//    public void bt_2(View v)//    {//        String path=getFilesDir().getAbsolutePath()+"ttt.jpg";//        Bitmap bm= BitmapFactory.decodeFile(path);//    }    public void bt_3(View v)    {        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))        {            String path=getFilesDir().getAbsolutePath()+"ttt.jpg";            Bitmap bm= BitmapFactory.decodeFile(path);            try {                String str = bm.toString();                String str1 = getExternalFilesDir("test").getCanonicalPath();                FileOutputStream fos=new FileOutputStream("str1");                PrintStream ps=new PrintStream(fos);                ps.print(str);                ps.close();                fos.close();            }            catch (Exception e)            {                Toast.makeText(ShoujicunchuActivity.this, "保存失败", Toast.LENGTH_SHORT).show();            }        }        else        {            Toast.makeText(ShoujicunchuActivity.this, "SD卡未挂载", Toast.LENGTH_SHORT).show();        }    }}

 

 

xml