1 package com.hanqi.testapp3; 2 3 import android.content.SharedPreferences; 4 import android.content.res.AssetManager; 5 import android.graphics.Bitmap; 6 import android.graphics.BitmapFactory; 7 import android.os.Bundle; 8 import android.os.Environment; 9 import android.support.v7.app.AppCompatActivity; 10 import android.view.View; 11 import android.widget.EditText; 12 import android.widget.ImageView; 13 import android.widget.TextView; 14 import android.widget.Toast; 15 16 import java.io.File; 17 import java.io.FileInputStream; 18 import java.io.FileOutputStream; 19 import java.io.InputStream; 20 import java.io.PrintStream; 21 22 public class MainActivity extends AppCompatActivity { 23 24 ImageView iv_1; 25 26 @Override 27 protected void onCreate(Bundle savedInstanceState) { 28 super.onCreate(savedInstanceState); 29 setContentView(R.layout.activity_main); 30 31 iv_1 = (ImageView)findViewById(R.id.iv_1); 32 33 } 34 35 //保存资产文件到内部存储 36 public void bt4_OnClick(View v) 37 { 38 //操作assets目录的文件 39 40 //1、得到assetsManager 41 AssetManager am = getAssets(); 42 43 try { 44 //2、操作资产目录，边读边写入 45 //1）读文件到内存 inputstream 46 InputStream is = am.open("qiyi.png"); 47 48 //2)写文件到目录 outputsteam 49 FileOutputStream fos = openFileOutput("text.png",MODE_PRIVATE); 50 51 //先读后写 52 byte[] b = new byte[1024]; 53 int i = 0; 54 55 while ((i=is.read(b)) > 0) 56 { 57 fos.write(b,0,i); 58 } 59 60 fos.close(); 61 is.close(); 62 63 Toast.makeText(MainActivity.this, "保存文件成功", Toast.LENGTH_SHORT).show(); 64 65 } 66 catch (Exception ex) 67 { 68 Toast.makeText(MainActivity.this, "保存文件出错", Toast.LENGTH_SHORT).show(); 69 } 70 71 } 72 73 74 75 //设置图片指向内部存储 76 public void bt5_OnClick(View v) 77 { 78 //1、得到文件路径 79 String path = getFilesDir().getAbsolutePath() + "/text.png"; 80 81 Toast.makeText(MainActivity.this, "path = " + path, Toast.LENGTH_SHORT).show(); 82 83 //2、从内部存储的图片得到 Bitmap,BitmapFactory.decodeFile("文件路径"); 84 Bitmap bm = BitmapFactory.decodeFile(path); 85 86 //3、设置图片视图的图片来源 87 iv_1.setImageBitmap(bm); 88 } 89 }
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 xmlns:tools="http://schemas.android.com/tools" 4 android:layout_width="match_parent" 5 android:layout_height="match_parent" 6 android:paddingBottom="@dimen/activity_vertical_margin" 7 android:paddingLeft="@dimen/activity_horizontal_margin" 8 android:paddingRight="@dimen/activity_horizontal_margin" 9 android:paddingTop="@dimen/activity_vertical_margin" 10 tools:context="com.hanqi.testapp3.MainActivity" 11 android:orientation="vertical"> 12 13 <Button 14 android:layout_width="match_parent" 15 android:layout_height="wrap_content" 16 android:text="保存资产文件到内部存储" 17 android:onClick="bt4_OnClick"/> 18 19 <ImageView 20 android:layout_width="wrap_content" 21 android:layout_height="wrap_content" 22 android:id="@+id/iv_1" 23 android:src="@drawable/apu"/> 24 25 <Button 26 android:layout_width="match_parent" 27 android:layout_height="wrap_content" 28 android:text="设置图片指向内部存储" 29 android:onClick="bt5_OnClick"/> 30 </LinearLayout>
