Android EditText TextChanged

Question

我想在edittext change（edittext length = 6）时启动新活动。我使用下面的代码，但没有工作。请帮帮我。

    a = (EditText) findViewById(R.id.editText1);
    a.addTextChangedListener(new TextWatcher() {
        @Override
        public void afterTextChanged(Editable s) {
            if(!s.equals("6") )
                    i = new Intent(getApplicationContext(), MainActivity.class);
                    startActivity(i);
                    finish();                
        }

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

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

        }
       });

Answer 1

我担心你是如何检查长度的，只需在afterTextChanged

中替换你的代码

 @Override
        public void afterTextChanged(Editable s) {
            if(a.getText().length()== 6 ) {
                Intent i = new Intent(getApplicationContext(), MainActivity.class);
                startActivity(i);
                finish();
            }
        }

Answer 2

试试这个

a.addTextChangedListener(new TextWatcher() {
            @Override
            public void afterTextChanged(Editable s) {

            }

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

            @Override
            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {
                        if(count==6 ){
                        i = new Intent(getApplicationContext(), MainActivity.class);
                        startActivity(i);
                        finish();  
            }
            }
           });

Answer 3

试试这段代码

a.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                // TODO Auto-generated method stub

            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                // TODO Auto-generated method stub

            }

            @Override
            public void afterTextChanged(Editable s) {

                if(s.length() == 6)
                {
                    Intent in = new Intent(CurrentActivity.this,TargetActivity.class);
                    startActivity(in);
                }

            }
        });

如果这适合您，请告诉我！ ：）

Answer 4

更新

 if(!s.equals("6") )

to 

 if(s.length()==6 )