Assets

package com.hanqi.testapp3;

import android.content.SharedPreferences;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.PrintStream;

public class MainActivity extends AppCompatActivity {

    ImageView iv_1;

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

        iv_1 = (ImageView)findViewById(R.id.iv_1);

    }

//保存资产文件到内部存储
    public void bt4_OnClick(View v)
    {
        //操作assets目录的文件

        //1、得到assetsManager
        AssetManager am = getAssets();

        try {
            //2、操作资产目录，边读边写入
            //1）读文件到内存  inputstream
            InputStream is = am.open("qiyi.png");

            //2)写文件到目录  outputsteam
            FileOutputStream fos = openFileOutput("text.png",MODE_PRIVATE);

            //先读后写
            byte[] b = new byte[1024];
            int i = 0;

            while ((i=is.read(b)) > 0)
            {
                fos.write(b,0,i);
            }

            fos.close();
            is.close();

            Toast.makeText(MainActivity.this, "保存文件成功", Toast.LENGTH_SHORT).show();

        }
        catch (Exception ex)
        {
            Toast.makeText(MainActivity.this, "保存文件出错", Toast.LENGTH_SHORT).show();
        }

    }



    //设置图片指向内部存储
    public void bt5_OnClick(View v)
    {
        //1、得到文件路径
        String path = getFilesDir().getAbsolutePath() + "/text.png";

        Toast.makeText(MainActivity.this, "path = " + path, Toast.LENGTH_SHORT).show();

        //2、从内部存储的图片得到 Bitmap,BitmapFactory.decodeFile("文件路径");
        Bitmap bm = BitmapFactory.decodeFile(path);

        //3、设置图片视图的图片来源
        iv_1.setImageBitmap(bm);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.hanqi.testapp3.MainActivity"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="保存资产文件到内部存储"
        android:onClick="bt4_OnClick"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/iv_1"
        android:src="@drawable/apu"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="设置图片指向内部存储"
        android:onClick="bt5_OnClick"/>
</LinearLayout>