snipt

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Java

Writing files on the SD card

/*
First of you need to add the proper permissions to the manifest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Then call prepareSdCard from for instance onCreate to make sure that the SD card is mounted and that 
your directories are present.

*/

	/**
	 * Returns the path where you want to store your files
	 * @return
	 */
	private String getSavePath(){
		return String.format(Environment
				.getExternalStorageDirectory()
				+ "/YourAppOrOtherDirNameOfYourChoice/");
	}
	
	/**
	 * Prepares the SD card by creating our subfolder where we will store all
	 * our images in.
	 */
	private void prepareSdCard() {
		if (android.os.Environment.getExternalStorageState().equals(
				android.os.Environment.MEDIA_MOUNTED)) {
			File sDir = new File(getSavePath());
			if (!sDir.exists()) {
				sDir.mkdirs();
			}
		} else {
			dlgInfo("There is no memory card available. This application requires a memory card to store the files on.");
		}
	}	

	/**
	 * Appends a text to the specified file
	 * 
	 * @param fileName
	 * 	         Path and name of the file to save to 
	 * @param txt
	 *           Text to append to the file 
	 */
	private void writeTextFile(String fileName, String txt){
		try {
			FileWriter writer = new FileWriter(new File(fileName));
			writer.append(txt);
			writer.flush();
			writer.close();		
		} catch (Exception e) {
			Toast.makeText(this, "Unable to save file " + fileName, Toast.LENGTH_LONG);
		}
	}
https://snippets.siftie.com/embed/04329d46f5cbd66acaa60dd8a38a354b/
/raw/04329d46f5cbd66acaa60dd8a38a354b/
04329d46f5cbd66acaa60dd8a38a354b
java
Java
54
2019-03-25T17:47:21
True
False
False
/api/public/snipt/18741/
writing-files-on-the-sd-card
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a> <a href="#L-29">29</a> <a href="#L-30">30</a> <a href="#L-31">31</a> <a href="#L-32">32</a> <a href="#L-33">33</a> <a href="#L-34">34</a> <a href="#L-35">35</a> <a href="#L-36">36</a> <a href="#L-37">37</a> <a href="#L-38">38</a> <a href="#L-39">39</a> <a href="#L-40">40</a> <a href="#L-41">41</a> <a href="#L-42">42</a> <a href="#L-43">43</a> <a href="#L-44">44</a> <a href="#L-45">45</a> <a href="#L-46">46</a> <a href="#L-47">47</a> <a href="#L-48">48</a> <a href="#L-49">49</a> <a href="#L-50">50</a> <a href="#L-51">51</a> <a href="#L-52">52</a> <a href="#L-53">53</a> <a href="#L-54">54</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="cm">/*</span> </span><span id="L-2"><a name="L-2"></a><span class="cm">First of you need to add the proper permissions to the manifest</span> </span><span id="L-3"><a name="L-3"></a> </span><span id="L-4"><a name="L-4"></a><span class="cm">&lt;uses-permission android:name=&quot;android.permission.WRITE_EXTERNAL_STORAGE&quot;/&gt;</span> </span><span id="L-5"><a name="L-5"></a> </span><span id="L-6"><a name="L-6"></a><span class="cm">Then call prepareSdCard from for instance onCreate to make sure that the SD card is mounted and that </span> </span><span id="L-7"><a name="L-7"></a><span class="cm">your directories are present.</span> </span><span id="L-8"><a name="L-8"></a> </span><span id="L-9"><a name="L-9"></a><span class="cm">*/</span> </span><span id="L-10"><a name="L-10"></a> </span><span id="L-11"><a name="L-11"></a> <span class="cm">/**</span> </span><span id="L-12"><a name="L-12"></a><span class="cm"> * Returns the path where you want to store your files</span> </span><span id="L-13"><a name="L-13"></a><span class="cm"> * @return</span> </span><span id="L-14"><a name="L-14"></a><span class="cm"> */</span> </span><span id="L-15"><a name="L-15"></a> <span class="kd">private</span> <span class="n">String</span> <span class="nf">getSavePath</span><span class="o">(){</span> </span><span id="L-16"><a name="L-16"></a> <span class="k">return</span> <span class="n">String</span><span class="o">.</span><span class="na">format</span><span class="o">(</span><span class="n">Environment</span> </span><span id="L-17"><a name="L-17"></a> <span class="o">.</span><span class="na">getExternalStorageDirectory</span><span class="o">()</span> </span><span id="L-18"><a name="L-18"></a> <span class="o">+</span> <span class="s">&quot;/YourAppOrOtherDirNameOfYourChoice/&quot;</span><span class="o">);</span> </span><span id="L-19"><a name="L-19"></a> <span class="o">}</span> </span><span id="L-20"><a name="L-20"></a> </span><span id="L-21"><a name="L-21"></a> <span class="cm">/**</span> </span><span id="L-22"><a name="L-22"></a><span class="cm"> * Prepares the SD card by creating our subfolder where we will store all</span> </span><span id="L-23"><a name="L-23"></a><span class="cm"> * our images in.</span> </span><span id="L-24"><a name="L-24"></a><span class="cm"> */</span> </span><span id="L-25"><a name="L-25"></a> <span class="kd">private</span> <span class="kt">void</span> <span class="nf">prepareSdCard</span><span class="o">()</span> <span class="o">{</span> </span><span id="L-26"><a name="L-26"></a> <span class="k">if</span> <span class="o">(</span><span class="n">android</span><span class="o">.</span><span class="na">os</span><span class="o">.</span><span class="na">Environment</span><span class="o">.</span><span class="na">getExternalStorageState</span><span class="o">().</span><span class="na">equals</span><span class="o">(</span> </span><span id="L-27"><a name="L-27"></a> <span class="n">android</span><span class="o">.</span><span class="na">os</span><span class="o">.</span><span class="na">Environment</span><span class="o">.</span><span class="na">MEDIA_MOUNTED</span><span class="o">))</span> <span class="o">{</span> </span><span id="L-28"><a name="L-28"></a> <span class="n">File</span> <span class="n">sDir</span> <span class="o">=</span> <span class="k">new</span> <span class="n">File</span><span class="o">(</span><span class="n">getSavePath</span><span class="o">());</span> </span><span id="L-29"><a name="L-29"></a> <span class="k">if</span> <span class="o">(!</span><span class="n">sDir</span><span class="o">.</span><span class="na">exists</span><span class="o">())</span> <span class="o">{</span> </span><span id="L-30"><a name="L-30"></a> <span class="n">sDir</span><span class="o">.</span><span class="na">mkdirs</span><span class="o">();</span> </span><span id="L-31"><a name="L-31"></a> <span class="o">}</span> </span><span id="L-32"><a name="L-32"></a> <span class="o">}</span> <span class="k">else</span> <span class="o">{</span> </span><span id="L-33"><a name="L-33"></a> <span class="n">dlgInfo</span><span class="o">(</span><span class="s">&quot;There is no memory card available. This application requires a memory card to store the files on.&quot;</span><span class="o">);</span> </span><span id="L-34"><a name="L-34"></a> <span class="o">}</span> </span><span id="L-35"><a name="L-35"></a> <span class="o">}</span> </span><span id="L-36"><a name="L-36"></a> </span><span id="L-37"><a name="L-37"></a> <span class="cm">/**</span> </span><span id="L-38"><a name="L-38"></a><span class="cm"> * Appends a text to the specified file</span> </span><span id="L-39"><a name="L-39"></a><span class="cm"> * </span> </span><span id="L-40"><a name="L-40"></a><span class="cm"> * @param fileName</span> </span><span id="L-41"><a name="L-41"></a><span class="cm"> * Path and name of the file to save to </span> </span><span id="L-42"><a name="L-42"></a><span class="cm"> * @param txt</span> </span><span id="L-43"><a name="L-43"></a><span class="cm"> * Text to append to the file </span> </span><span id="L-44"><a name="L-44"></a><span class="cm"> */</span> </span><span id="L-45"><a name="L-45"></a> <span class="kd">private</span> <span class="kt">void</span> <span class="nf">writeTextFile</span><span class="o">(</span><span class="n">String</span> <span class="n">fileName</span><span class="o">,</span> <span class="n">String</span> <span class="n">txt</span><span class="o">){</span> </span><span id="L-46"><a name="L-46"></a> <span class="k">try</span> <span class="o">{</span> </span><span id="L-47"><a name="L-47"></a> <span class="n">FileWriter</span> <span class="n">writer</span> <span class="o">=</span> <span class="k">new</span> <span class="n">FileWriter</span><span class="o">(</span><span class="k">new</span> <span class="n">File</span><span class="o">(</span><span class="n">fileName</span><span class="o">));</span> </span><span id="L-48"><a name="L-48"></a> <span class="n">writer</span><span class="o">.</span><span class="na">append</span><span class="o">(</span><span class="n">txt</span><span class="o">);</span> </span><span id="L-49"><a name="L-49"></a> <span class="n">writer</span><span class="o">.</span><span class="na">flush</span><span class="o">();</span> </span><span id="L-50"><a name="L-50"></a> <span class="n">writer</span><span class="o">.</span><span class="na">close</span><span class="o">();</span> </span><span id="L-51"><a name="L-51"></a> <span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="n">Exception</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span> </span><span id="L-52"><a name="L-52"></a> <span class="n">Toast</span><span class="o">.</span><span class="na">makeText</span><span class="o">(</span><span class="k">this</span><span class="o">,</span> <span class="s">&quot;Unable to save file &quot;</span> <span class="o">+</span> <span class="n">fileName</span><span class="o">,</span> <span class="n">Toast</span><span class="o">.</span><span class="na">LENGTH_LONG</span><span class="o">);</span> </span><span id="L-53"><a name="L-53"></a> <span class="o">}</span> </span><span id="L-54"><a name="L-54"></a> <span class="o">}</span> </span></pre></div> </td></tr></table>
android