4个edittext切换焦点怎么做？

Question

想做一个类似验证码输入框的控件，从左到右摆放了4个edittext，现在监听当一个edittext输入字符后，就吧焦点跳到下一个edittext，如果点击键盘删除键，把光标切换到前一个edittext，但是效果做不出来。有没有人帮我看看public class MainActivity1 extends AppCompatActivity {
    private EditText edit1;
    private EditText edit2;
    private EditText edit3;
    private EditText edit4;
    private List<EditText> edits = new ArrayList<>();    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);        edit1 = findViewById(R.id.edit1);
        edit2 = findViewById(R.id.edit2);
        edit3 = findViewById(R.id.edit3);
        edit4 = findViewById(R.id.edit4);        edit1.addTextChangedListener(textWatcher);
        edit1.setOnKeyListener(onKeyListener);
        edit2.addTextChangedListener(textWatcher);
        edit2.setOnKeyListener(onKeyListener);
        edit3.addTextChangedListener(textWatcher);
        edit3.setOnKeyListener(onKeyListener);
        edit4.addTextChangedListener(textWatcher);
        edit4.setOnKeyListener(onKeyListener);        edits.add(edit1);
        edits.add(edit2);
        edits.add(edit3);
        edits.add(edit4);
    }    private TextWatcher textWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {        }        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {        }        @Override
        public void afterTextChanged(Editable s) {
            for (int i=0; i<edits.size(); i++) {
                EditText e1 = edits.get(i);
                if (e1.getText().toString().length() > 0 && i < edits.size()-1) {
                    EditText e2 = edits.get(i+1);
                    e2.requestFocus();
                }
            }
        }
    };    private View.OnKeyListener onKeyListener = new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_DEL) {
                for (int i=edits.size()-1; i>=0; i--) {
                    EditText e1 = edits.get(i);
                    if (e1.getText().toString().length() > 0 ) {
                        e1.setText("");
                        if (i > 0) {
                            EditText e2 = edits.get(i-1);
                            e2.requestFocus();
                        }
                    }
                }
            }
            return false;
        }
    };
}

Answer 1

我直接写了一个Demo，我运行了，符合你的需求
public class LauncherActivity extends AppCompatActivity {    EditText et_one,et_two,et_three,et_four;    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_launcher);        et_one=(EditText)findViewById(R.id.et_one);
        et_two=(EditText)findViewById(R.id.et_two);
        et_three=(EditText)findViewById(R.id.et_three);
        et_four=(EditText)findViewById(R.id.et_four);
        et_two.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {            }            @Override
            public void afterTextChanged(Editable s) {                if(TextUtils.isEmpty(s.toString())&&et_two.isFocusable()){
                    et_two.setFocusable(false);
                    et_one.setFocusable(true);
                    et_one.setFocusableInTouchMode(true);
                    et_one.requestFocus();
                }
            }
        });        et_three.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {            }            @Override
            public void afterTextChanged(Editable s) {                if(TextUtils.isEmpty(s.toString())&&et_three.isFocusable()){
                    et_three.setFocusable(false);
                    et_two.setFocusable(true);
                    et_two.setFocusableInTouchMode(true);
                    et_two.requestFocus();
                }
            }
        });
        et_four.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {            }            @Override
            public void afterTextChanged(Editable s) {                if(TextUtils.isEmpty(s.toString())&&et_four.isFocusable()){
                    et_four.setFocusable(false);
                    et_three.setFocusable(true);
                    et_three.setFocusableInTouchMode(true);
                    et_three.requestFocus();
                }
            }
        });    }
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".two.LauncherActivity"
    android:orientation="vertical">    <EditText
        android:id="@+id/et_one"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:imeOptions="actionNone"
        android:singleLine="true"/>    <EditText
        android:id="@+id/et_two"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:imeOptions="actionNone"
        android:singleLine="true"/>    <EditText
        android:id="@+id/et_three"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:imeOptions="actionNone"
        android:singleLine="true"/>    <EditText
        android:id="@+id/et_four"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:imeOptions="actionDone"
        android:singleLine="true"/></LinearLayout>

Answer 2

你好像应该用edits.get(i)=findviewById();这样来找id