学习笔记——一个简单的还原短信的Android应用出现的问题

package com.example.writesms;

import android.support.v7.app.ActionBarActivity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
private Button writeBt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
writeBt = (Button) findViewById(R.id.write_btn);
writeBt.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
ContentResolver cr = getContentResolver();
ContentValues cv = new ContentValues();
cv.put("address", "110");
cv.put("date", System.currentTimeMillis());
cv.put("body", "go home!");
cv.put("type", "1");
cr.insert(Uri.parse("content://sms"), cv);
Toast.makeText(getApplicationContext(), "还原短信", 1).show();
}
});
}
}