Android上层怎样读写proc节点（示例）

import android.app.Activity; import android.os.Bundle; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.ToggleButton; import android.os.SystemProperties; import android.util.Log; import android.widget.Toast; //wang import java.util.Timer; import java.util.TimerTask; import android.os.PowerManager; import java.io.*; import android.os.Looper; public class DebugOptionActivity extends Activity { private static final String TAG = "tpDebug"; private int checkValue = 0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.debug); ToggleButton toggle = (ToggleButton)findViewById(R.id.toggle); try{ File readFile = new File("proc/tp_debug/debug_switch"); FileReader inCmd = new FileReader(readFile); try{ checkValue = inCmd.read(); if(checkValue != 0) { toggle.setChecked(true); } else { toggle.setChecked(false); } }catch (IOException e){ e.printStackTrace(); } } catch (FileNotFoundException e){ e.printStackTrace(); } //ToggleButton toggle = (ToggleButton)findViewById(R.id.toggle); toggle.setOnCheckedChangeListener(new OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton arg0, boolean arg1) { if (arg1) { //open File awakeTimeFile = new File("proc/tp_debug/debug_switch"); FileWriter fr; try { fr = new FileWriter(awakeTimeFile); fr.write("1"); fr.close(); } catch (IOException e) { e.printStackTrace(); } } else { //close File awakeTimeFile = new File("proc/tp_debug/debug_switch"); FileWriter fr; try { fr = new FileWriter(awakeTimeFile); fr.write("0"); fr.close(); } catch (IOException e) { e.printStackTrace(); } } } }); } }