Android 仿滴滴输入验证码样式，自动监听输入个数

说实话，现在的水平提高了，app的美化也逐渐上升，一些恶心的ui也慢慢的浮出水面，来等我们程序员来填完这个坑，我这人比较懒，只有用到的时候才会开始搞，搞完就赶紧的分享给大家，哈哈。每日进一步，我要走多远

 <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="30dp"
        >
        <EditText
            android:id="@+id/ed1"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_gravity="center"
            android:layout_marginLeft="20dp"
            android:gravity="center"
            android:inputType="number"
            android:maxLength="1"
            android:numeric="integer" />

        <EditText
            android:id="@+id/ed2"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_gravity="center"
            android:layout_marginLeft="20dp"
            android:gravity="center"
            android:inputType="number"
            android:maxLength="1"
            android:numeric="integer" />

        <EditText
            android:id="@+id/ed3"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_gravity="center"
            android:layout_marginLeft="20dp"
            android:gravity="center"
            android:inputType="number"
            android:maxLength="1"
            android:numeric="integer" />

        <EditText
            android:id="@+id/ed4"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_gravity="center"
            android:layout_marginLeft="20dp"
            android:gravity="center"
            android:inputType="number"
            android:maxLength="1"
            android:numeric="integer" />


    </LinearLayout>

下面是Activity实现代码，如果不清楚，先都拷下来，运行一下，你就明白了
代码其实很简单

private EditText ed1;
private EditText ed2;
private EditText ed3;
private EditText ed4;
int index = 1;
private EditText[] mArray;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
    initListener();
}


private void initView() {
    ed1 = (EditText) findViewById(R.id.ed1);
    ed2 = (EditText) findViewById(R.id.ed2);
    ed3 = (EditText) findViewById(R.id.ed3);
    ed4 = (EditText) findViewById(R.id.ed4);
}

private void initListener() {
    mArray = new EditText[]{ed1, ed2, ed3, ed4};
    for (int i = 0; i < mArray.length; i++) {
        final int j = i;
        mArray[j].addTextChangedListener(new TextWatcher() {
            private CharSequence temp;

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

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

            @Override
            public void afterTextChanged(Editable s) {

                if (temp.length() == 1 && j >= 0 && j < mArray.length - 1) {
                    mArray[j + 1].setFocusable(true);
                    mArray[j + 1].setFocusableInTouchMode(true);
                    mArray[j + 1].requestFocus();
                }

                if (temp.length() == 0) {
                    if (j >= 1) {
                        mArray[j - 1].setFocusable(true);
                        mArray[j - 1].setFocusableInTouchMode(true);
                        mArray[j - 1].requestFocus();
                    }
                }
                checkNumber();
            }
        });
    }

}

public void checkNumber() {

    if (!TextUtils.isEmpty(ed1.getText().toString().trim()) && !TextUtils.isEmpty(ed2.getText().toString().trim()) && !TextUtils.isEmpty(ed3.getText().toString().trim()) && !TextUtils.isEmpty(ed4.getText().toString().trim())) {
        Toast.makeText(this, ed1.getText().toString().trim() + ed2.getText().toString().trim() + ed3.getText().toString().trim() + ed4.getText().toString().trim(), Toast.LENGTH_SHORT).show();
        index++;
        if (index % 2 == 0) {
            for (EditText editText : mArray) {
                editText.setText("");
            }
            ed1.setFocusable(true);
            ed1.setFocusableInTouchMode(true);
            ed1.requestFocus();
        }
    }
}