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();
}
}
});
}
}
java
<?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>
xml
转载于:https://www.cnblogs.com/wangchuanqi/p/5536902.html
