Android Java - Reading in Text File of Integers, Storing Integers in Array, and Graphing Them -
so, code, trying read in .txt file contains integers, store integers array list via parseint(), , graphing points via graphview. have done debugging code , have noticed none of points being graphed , when test out code printing values array list via label, crashes app. unsure of going on, think on right track in process. here code below. *note: used textview labels tests determine if data read in (in case it's not). in advance!
mainactivity.java
package com.example.anjanarajagopal.graph; import android.os.bundle; import android.support.v7.app.actionbaractivity; import android.view.menu; import android.view.menuitem; import android.widget.textview; import com.jjoe64.graphview.graphview; import com.jjoe64.graphview.series.datapoint; import com.jjoe64.graphview.series.linegraphseries; import java.io.bufferedreader; import java.io.inputstream; import java.io.inputstreamreader; import java.util.arraylist; import java.util.list; public class mainactivity extends actionbaractivity { private static final string tag = mainactivity.class.getname(); private static final string filename = "data.txt"; private textview textview1; private textview textview2; private textview textview3; private textview textview4; private textview textview5; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); list<integer> data = new arraylist<integer>(); try { inputstream inputstream = openfileinput(filename); if(inputstream != null){ inputstreamreader streamreader = new inputstreamreader(inputstream); bufferedreader bufferedreader = new bufferedreader(streamreader); string line; while((line = bufferedreader.readline()) != null) { int = integer.parseint(line); data.add(i); } } inputstream.close(); } catch(exception e) { system.err.format("exception occurred trying read '%s'.", filename); e.printstacktrace(); //return null; } //for(int = 0; < data.size(); i++) //{ // int value = data.get(i); // system.out.print(value + " "); //} //textview1 = (textview)findviewbyid(r.id.textview1); //textview2 = (textview)findviewbyid(r.id.textview2); //textview3 = (textview)findviewbyid(r.id.textview3); //textview4 = (textview)findviewbyid(r.id.textview4); //textview5 = (textview)findviewbyid(r.id.textview5); //textview1.settext(integer.tostring(data.get(0))); //textview2.settext(integer.tostring(data.get(1))); //textview3.settext(integer.tostring(data.get(2))); //textview4.settext(integer.tostring(data.get(3))); //textview5.settext(integer.tostring(data.get(4))); graphview graph; graph = (graphview) findviewbyid(r.id.graph); for(int = 0; < data.size(); i++) { linegraphseries<datapoint> series = new linegraphseries<datapoint>(new datapoint[]{ new datapoint(i, data.get(i)) }); graph.addseries(series); } } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.menu_main, menu); return true; } @override public boolean onoptionsitemselected(menuitem item) { // handle action bar item clicks here. action bar // automatically handle clicks on home/up button, long // specify parent activity in androidmanifest.xml. int id = item.getitemid(); //noinspection simplifiableifstatement if (id == r.id.action_settings) { return true; } return super.onoptionsitemselected(item); } } data.txt 142 149 146 142 152 165 178 188 171 169 179 155 129 117 125 155 204 251 270 265
activity_main.xml
<relativelayout 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:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" android:paddingbottom="@dimen/activity_vertical_margin" tools:context=".mainactivity"> <textview android:text="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textview5" android:layout_below="@+id/textview4" android:layout_alignleft="@+id/textview3" android:layout_alignstart="@+id/textview3" /> <com.jjoe64.graphview.graphview android:layout_width="match_parent" android:layout_height="200dip" android:id="@+id/graph" android:layout_alignparenttop="true" android:layout_alignparentleft="true" android:layout_alignparentstart="true" /> <textview android:text="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textview2" android:layout_centervertical="true" android:layout_centerhorizontal="true" /> <textview android:text="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textview3" android:layout_below="@+id/textview2" android:layout_alignright="@+id/graph" android:layout_alignend="@+id/graph" /> <textview android:text="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textview4" android:layout_below="@+id/textview3" android:layout_alignleft="@+id/textview2" android:layout_alignstart="@+id/textview2" /> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="hello world!" android:id="@+id/textview1" android:layout_below="@+id/textview5" android:layout_alignright="@+id/textview4" android:layout_alignend="@+id/textview4" /> </relativelayout>
in particular case should put data.txt in src/main/assets folder. instead of line
inputstream inputstream = openfileinput(filename); use following line
inputstream inputstream = getassets().open(filename);
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