TweetEdit.java

package com.ch_linghu.fanfoudroid.ui.module;

import android.graphics.Color;
import android.text.Editable;
import android.text.InputFilter;
import android.text.Selection;
import android.text.TextWatcher;
import android.view.View.OnKeyListener;
import android.widget.EditText;
import android.widget.TextView;

public class TweetEdit {
	private EditText mEditText;
	private TextView mCharsRemainText;
	private int originTextColor;

	public TweetEdit(EditText editText, TextView charsRemainText) {
		mEditText = editText;
		mCharsRemainText = charsRemainText;

		originTextColor = mCharsRemainText.getTextColors().getDefaultColor();

		mEditText.addTextChangedListener(mTextWatcher);
		mEditText.setFilters(new InputFilter[] { new InputFilter.LengthFilter(
				MAX_TWEET_INPUT_LENGTH) });
	}

	private static final int MAX_TWEET_LENGTH = 140;
	private static final int MAX_TWEET_INPUT_LENGTH = 400;

	public void setTextAndFocus(String text, boolean start) {
		setText(text);
		Editable editable = mEditText.getText();
		if (!start) {
			Selection.setSelection(editable, editable.length());
		} else {
			Selection.setSelection(editable, 0);
		}
		mEditText.requestFocus();
	}

	public void setText(String text) {
		mEditText.setText(text);
		updateCharsRemain();
	}

	private TextWatcher mTextWatcher = new TextWatcher() {
		@Override
		public void afterTextChanged(Editable e) {
			updateCharsRemain();
		}

		@Override
		public void beforeTextChanged(CharSequence s, int start, int count,
				int after) {
		}

		@Override
		public void onTextChanged(CharSequence s, int start, int before,
				int count) {
		}
	};

	public void updateCharsRemain() {
		int remaining = MAX_TWEET_LENGTH - mEditText.length();
		if (remaining < 0) {
			mCharsRemainText.setTextColor(Color.RED);
		} else {
			mCharsRemainText.setTextColor(originTextColor);
		}
		mCharsRemainText.setText(remaining + "");
	}

	public String getText() {
		return mEditText.getText().toString();
	}

	public void setEnabled(boolean b) {
		mEditText.setEnabled(b);
	}

	public void setOnKeyListener(OnKeyListener listener) {
		mEditText.setOnKeyListener(listener);
	}

	public void addTextChangedListener(TextWatcher watcher) {
		mEditText.addTextChangedListener(watcher);
	}

	public void requestFocus() {
		mEditText.requestFocus();
	}

	public EditText getEditText() {
		return mEditText;
	}

}