asserts文件存到外部SD卡里
layout代码:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<?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.example.wang.testapp3.ZuoyeActivity" android:orientation="vertical"> <ImageView android:layout_width="100dp" android:layout_height="100dp" android:background="#a1a1a1" android:id="@+id/iv_1"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="asserts文件存到外部SD卡里" android:id="@+id/bt_1"/> </LinearLayout>
Activity代码:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package com.example.wang.testapp3; 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.Button; import android.widget.ImageView; import android.widget.Toast; import java.io.FileOutputStream; import java.io.InputStream; import java.io.PrintStream; public class ZuoyeActivity extends AppCompatActivity { ImageView iv_1; Button bt_1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_zuoye); iv_1=(ImageView)findViewById(R.id.iv_1); bt_1=(Button)findViewById(R.id.bt_1); bt_1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { try { AssetManager assetManager=getAssets(); InputStream inputStream = assetManager.open("sss.jpg"); FileOutputStream fos=openFileOutput("test3.jpg",MODE_PRIVATE); byte[] b=new byte[1024]; int i=0; while ((i=inputStream.read(b))>0) { fos.write(b,0,i); } fos.close(); inputStream.close(); String path=getFilesDir().getAbsolutePath()+"/test3.jpg"; Toast.makeText(ZuoyeActivity.this, "path="+path, Toast.LENGTH_SHORT).show(); Bitmap bm= BitmapFactory.decodeFile(path); iv_1.setImageBitmap(bm); Toast.makeText(ZuoyeActivity.this, "保存文件成功", Toast.LENGTH_SHORT).show(); if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { try { String path1=Environment.getExternalStorageDirectory() .getCanonicalPath(); Toast.makeText(ZuoyeActivity.this, "path1="+path1, Toast.LENGTH_LONG).show(); FileOutputStream fos1=new FileOutputStream(path1+"/test3.jpg"); PrintStream ps=new PrintStream(fos1); ps.print(R.id.iv_1); ps.close(); fos.close(); Toast.makeText(ZuoyeActivity.this, "写入外部文件成功", Toast.LENGTH_SHORT).show(); } catch (Exception e) { Toast.makeText(ZuoyeActivity.this, "存储文件出错", Toast.LENGTH_SHORT).show(); } } else { Toast.makeText(ZuoyeActivity.this, "SD卡没有挂载", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { Toast.makeText(ZuoyeActivity.this, "保存文件出错", Toast.LENGTH_SHORT).show(); } } }); } }