protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setTheme(android.R.style.Theme_Black);

         //Return the intent that started this activity.

         final Intent intent = getIntent();

         //获取intent里到底是绑定action字符串，下面用来判断是点了哪个按钮

         final String action = intent.getAction();

         setContentView(R.layout.mydiaryedit);//添加对应的layout

         System.out.println("intent.getAction():"+intent.getAction());

         myToast("intent.getAction():"+intent.getAction());

         TextView wyl_tv = (TextView) findViewById(R.id.wyl_txt);

         wyl_tv.setText("intent.getAction():"+intent.getAction()+";\n\n"

                 + " URI uri = intent.getData(): "+intent.getData()+";\n\n MyDiaryEdit.java的intent："+getIntent());

         mTitleText = (EditText) findViewById(R.id.title);

         mBodyText = (EditText) findViewById(R.id.body);

         confirmButton = (Button) findViewById(R.id.confirm);

         modifyButton = (Button) findViewById(R.id.modified);

         if (EDIT_TEXT_ACTION.equals(action)) {

             /*

              * EDIT_TEXT_ACTION.equals(action),EDIT_TEXT_ACTION就是前一个

              * 页面中intent.setAction的时候设置的哪个字符串，这样就能够判断是不是点了新增日记的按钮了

              */

             mState = STATE_EDIT;

             mTitleText.setEnabled(false);//设置为不可编辑

             mBodyText.setEnabled(false);//设置不可编辑

             modifyButton.setVisibility(View.VISIBLE);//把修改按钮设置为可见

             mUri = intent.getData();

             mCursor = managedQuery(mUri, projection, null, null, null);

             mCursor.moveToFirst();

             String title = mCursor.getString(1);

             mTitleText.setTextKeepState(title);

             String body = mCursor.getString(2);

             mBodyText.setTextKeepState(body);

             setResult(RESULT_OK, new Intent(MyDiaryEdit.EDIT_TEXT_ACTION, mUri));

             setTitle("编辑日记");

         } else if (INSERT_TEXT_ACTION.equals(action)) {

             mState = STATE_INSERT;

             setTitle("新建日记");

         } else {

             Log.e(TAG, "no such action error");

             MyDiaryEdit.this.finish();

             return;

         }

         confirmButton.setOnClickListener(new MyBtnOnClickListen());

         modifyButton.setOnClickListener(new MyBtnOnClickListen());

     }

void android.view.View.setVisibility(int visibility)

 <Button

                 android:id="@+id/modified"

                 android:layout_width="wrap_content"

                 android:layout_height="wrap_content"

                 android:layout_alignParentBottom="true"

                 android:text="click me!编辑"

                 android:visibility="invisible" >

             </Button>

 modifyButton.setVisibility(View.VISIBLE);//把修改按钮设置为可见