在實際開發中，有時候會讓使用者釋出一些類似微博、說說的東西，但是這個是有限制長度的，除了在文字輸入框限制長度外，還要在旁邊有一條提示還能輸入多少個字的“友好提示”。

1、文字框限制輸入長度

2、安卓沒有提供文字域，這裡順便提一下如果把textview製作成文字域。

<EditText
            android:id="@+id/push_edit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#FFFFFF"
            android:hint="請輸入你要發表的說說內容"
            android:maxLength="100"
            android:maxLines="6"
            android:minLines="6"
            android:textColor="#6C6C6C"
            android:textSize="12dp" >

            <requestFocus />
        </EditText>
 

public class MainActivity extends Activity {

	private EditText pushEdit;
	private TextView textNum;
	private Button btnSave,btnDelete;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		pushEdit = (EditText)findViewById(R.id.push_edit);
		textNum = (TextView)findViewById(R.id.talk_personal_draftbox_num);
		btnSave = (Button)findViewById(R.id.push_ok);
		btnDelete = (Button)findViewById(R.id.push_delete);
		pushEdit.addTextChangedListener(textChange);

		btnSave.setOnClickListener(new Button.OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(getBaseContext(), "您提交的內容是："+pushEdit.getText().toString(), Toast.LENGTH_LONG).show();
			}
		});
		
		btnDelete.setOnClickListener(new Button.OnClickListener() {
			@Override
			public void onClick(View v) {
				pushEdit.setText("");
			}
		});
	}
	
	TextWatcher textChange = new TextWatcher(){
		
		@Override
		public void afterTextChanged(Editable s) {
			if(pushEdit.length()<=100){
				textNum.setText(100-pushEdit.length()+"");
			}
		}

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