Android Open Source - Build.prop-Editor Edit Prop Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package org.nathan.jf.build.prop.editor;
//from   w  ww .  j a v  a 2 s  .c  o  m
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.util.Properties;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.Toast;
import android.text.Editable;
import android.text.TextWatcher;

public class EditPropActivity extends Activity {

  private EditText editName;
  private EditText editKey;
  protected boolean changesPending;
  private AlertDialog unsavedChangesDialog;
  private String tempFile;
  private String propReplaceFile;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.edit_prop);
    
    tempFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/buildprop.tmp";
    propReplaceFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/propreplace.txt";
    setUpControls();
  }

  private void setUpControls() {
    editName = (EditText)findViewById(R.id.prop_name);
      editKey = (EditText)findViewById(R.id.prop_key);
      
      String name = getIntent().getExtras().getString("name");
      String key = getIntent().getExtras().getString("key");
      
      if (name != null) {
      editName.setText(name);
        editKey.setText(key);
      }
      
      editName.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        changesPending = true;
      }
      
      @Override
      public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // TODO: Nothing
      }
      
      @Override
      public void afterTextChanged(Editable s) {
        // TODO: Nothing
      }
    });
      
      editKey.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        changesPending = true;
      }
      
      @Override
      public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // TODO: Nothing
      }
      
      @Override
      public void afterTextChanged(Editable s) {
        // TODO: Nothing
      }
    });
  }
  
  @Override
    public boolean onCreateOptionsMenu(Menu menu) {
      MenuInflater inflater = getMenuInflater();
      inflater.inflate(R.menu.edit, menu);
      return true;
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
      switch (item.getItemId()) {
        case R.id.save_menu:
          final Properties prop = new Properties();
        
        try {
          FileInputStream in = new FileInputStream(new File(tempFile));
          prop.load(in);
          in.close();
        } catch (IOException e) {
          Toast.makeText(getApplicationContext(), "Error: " + e, Toast.LENGTH_SHORT).show();
        }
        
        prop.setProperty(editName.getText().toString(), editKey.getText().toString());
        
          try {
            FileOutputStream out = new FileOutputStream(new File(tempFile));
            prop.store(out, null);
            out.close();
            
            replaceInFile(new File(tempFile));
            transferFileToSystem();
        } catch (IOException e) {
          Toast.makeText(getApplicationContext(), "Error: " + e, Toast.LENGTH_SHORT).show();
        }
          
          finish();
          break;
        case R.id.discart_menu:
          cancel();
          break;
      }

      return true;
    }
  
  protected void cancel() {
    if (changesPending) {
      unsavedChangesDialog = new AlertDialog.Builder(this)
      .setTitle(R.string.unsaved_changes_title)
      .setMessage(R.string.unsaved_changes_message)
      .setPositiveButton(R.string.save, new AlertDialog.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          final Properties prop = new Properties();
          
          try {
            FileInputStream in = new FileInputStream(new File(tempFile));
            prop.load(in);
            in.close();
          } catch (IOException e) {
            Toast.makeText(getApplicationContext(), "Error: " + e, Toast.LENGTH_SHORT).show();
          }
          
          prop.setProperty(editName.getText().toString(), editKey.getText().toString());
          
            try {
              FileOutputStream out = new FileOutputStream(new File(tempFile));
              prop.store(out, null);
              out.close();
              
              replaceInFile(new File(tempFile));
              transferFileToSystem();
          } catch (IOException e) {
            Toast.makeText(getApplicationContext(), "Error: " + e, Toast.LENGTH_SHORT).show();
          }
        }
      })
      .setNeutralButton(R.string.discart, new AlertDialog.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          finish();
        }
      })
      .setNegativeButton(R.string.cancel, new AlertDialog.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          unsavedChangesDialog.cancel();
        }
      }).create();
      unsavedChangesDialog.show();
    } else {
      finish();
    }
  }
  
  private void transferFileToSystem() {
      Process process = null;
        DataOutputStream os = null;
        
        try {
            process = Runtime.getRuntime().exec("su");
          os = new DataOutputStream(process.getOutputStream());
          os.writeBytes("mount -o remount,rw -t yaffs2 /dev/block/mtdblock4 /system\n");
          os.writeBytes("mv -f /system/build.prop /system/build.prop.bak\n");
          os.writeBytes("busybox cp -f " + propReplaceFile + " /system/build.prop\n");
          os.writeBytes("chmod 644 /system/build.prop\n");
          //os.writeBytes("mount -o remount,ro -t yaffs2 /dev/block/mtdblock4 /system\n");
          //os.writeBytes("rm " + propReplaceFile);
          //os.writeBytes("rm " + tempFile);
          os.writeBytes("exit\n");
          os.flush();
          process.waitFor();
        } catch (Exception e) {
            Toast.makeText(getApplicationContext(), "Error: " + e.getMessage(), Toast.LENGTH_SHORT).show();
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                process.destroy();
            } catch (Exception e) {
              Toast.makeText(getApplicationContext(), "Error: " + e.getMessage(), Toast.LENGTH_SHORT).show();
            }
        }
        
      Toast.makeText(getApplicationContext(), "Edit saved and a backup was made at " + Environment.getExternalStorageDirectory().getAbsolutePath() + "/build.prop.bak", Toast.LENGTH_SHORT).show();
    }
  
  private void replaceInFile(File file) throws IOException {
    File tmpFile = new File(propReplaceFile);
    FileWriter fw = new FileWriter(tmpFile);
    Reader fr = new FileReader(file);
    BufferedReader br = new BufferedReader(fr);
    
    while (br.ready()) {
      fw.write(br.readLine().replaceAll("\\\\", "") + "\n");
    }
    
    fw.close();
    br.close();
    fr.close();
  }
}

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