程式碼如下：

public class MainActivity extends AppCompatActivity {
    EditText editText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText) findViewById(R.id.edit_text);

        findViewById(R.id.click).setOnClickListener(new
 
 View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (editText.getText().length() != 0) {
                    getTabWidth(editText.getText());
                }
            }
        });
    }

    protected void getTabWidth(CharSequence text) {
        int
 
 chineseNum = 0;
        int bigCharNum = 0;
        int smallNum = 0;

        Pattern p = Pattern.compile("[\u4e00-\u9fa5]");
        int len = 0;
        for (int i = 0; i < text.length(); i++) {
            char cr = text.charAt(i);
            Matcher m = p.matcher(String.valueOf(cr));
            if
 
 (m.matches()) {
                chineseNum ++;
            } else if (!Character.isLowerCase(cr)) {
                bigCharNum ++;
            } else {
                smallNum ++;
            }
        }

        Log.e("owen", "chineseNum: " + chineseNum + " bigCharNum: " + bigCharNum + " smallNum" + smallNum);
    }
}