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问如何处理addTextChangedListener和内存
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Stack Overflow用户

提问于 2017-02-08 08:26:29

回答 2查看 1K关注 0票数 0

public class MainActivity extends AppCompatActivity {

EditText Percent, mmolGlic, mgGlic;

double mmol = 0, mg = 0, perc = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Percent = (EditText) findViewById(R.id.percent);
    mmolGlic = (EditText) findViewById(R.id.mmol_glic);
    mgGlic = (EditText) findViewById(R.id.mg_glic);



    /*mmolGlic.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) {
            frommMol();
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });*/

    Percent.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) {
            fromPercent();
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });

    /*mgGlic.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) {
            frommg();
        }
    });*/
}

public void frommMol() {
    mmol = Double.parseDouble(mmolGlic.getText().toString());
    perc = (mmol/10.929) + 2.15;
    Percent.setText(String.format( "%.2f", perc ));
}

public void fromPercent(){
    perc = Double.parseDouble(Percent.getText().toString());
    mmol = (perc - 2.15) * 10.929;
    mmolGlic.setText(String.format( "%.2f", mmol ));
    mg = (perc*28.7) - 46.7;
    mgGlic.setText(String.format( "%.2f", mg ));
}

public void frommg(){
    mg = Double.parseDouble(mgGlic.getText().toString());
    perc = (mg + 46.7) / 28.7;
    Percent.setText(String.format( "%.2f", perc ));


}

}

大家早上好:)

这是一个连续的问题：Question 1

这是我想要做的事情的示例代码。但我有一些问题。我认为其中大多数都是为了变量的逻辑，以及如何处理更多EditTexts中的输入。例如：

主要问题是我不能使用一个以上的addTextChangedListener。我试图更好地解释:如果我把代码留在这里，应用程序就会崩溃。我不确定，也许是因为我如何处理这三个EditTexts。
然后，当我删除文本时，我会遇到一个问题:如果我有"5.99“，然后按del，当删除它时，删除它直到5，然后崩溃。当文本字段为空时，应该设置变量= 0。

你能帮帮我吗?非常感谢

android

android-studio

android-activity

android-edittext

回答 2

Stack Overflow用户

回答已采纳

发布于 2017-02-08 09:37:24

public class MainActivity extends AppCompatActivity {

EditText Percent, mmolGlic, mgGlic;

double mmol = 0, mg = 0, perc = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Percent = (EditText) findViewById(R.id.percent);
    mmolGlic = (EditText) findViewById(R.id.mmol_glic);
    mgGlic = (EditText) findViewById(R.id.mg_glic);

 Percent.addTextChangedListener(percentWatcher);
        mmolGlic.addTextChangedListener(mmolGlicTextWatcher);
        mgGlic.addTextChangedListener(mgGlicWatcher);
}

 public void frommMol() {
        if (!mmolGlic.getText().toString().trim().isEmpty()) {
            mmol = Double.parseDouble(mmolGlic.getText().toString());
            perc = (mmol / 10.929) + 2.15;
            Percent.removeTextChangedListener(percentWatcher);
            Percent.setText(String.format("%.2f", perc));
            Percent.addTextChangedListener(percentWatcher);
        }
    }

    public void fromPercent() {
        if (!Percent.getText().toString().trim().isEmpty()) {
            perc = Double.parseDouble(Percent.getText().toString().trim());
            mmol = (perc - 2.15) * 10.929;
            mmolGlic.removeTextChangedListener(mmolGlicTextWatcher);
            mgGlic.removeTextChangedListener(mgGlicWatcher);
            mmolGlic.setText(String.format("%.2f", mmol));
            mg = (perc * 28.7) - 46.7;
            mgGlic.setText(String.format("%.2f", mg));
            mmolGlic.addTextChangedListener(mmolGlicTextWatcher);
            mgGlic.addTextChangedListener(mgGlicWatcher);
        }
    }

    public void frommg() {
        if (!mgGlic.getText().toString().trim().isEmpty()) {
            mg = Double.parseDouble(mgGlic.getText().toString());
            perc = (mg + 46.7) / 28.7;
            Percent.removeTextChangedListener(percentWatcher);
            Percent.setText(String.format("%.2f", perc));
            Percent.addTextChangedListener(percentWatcher);
        }
    }


    private TextWatcher percentWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            fromPercent();
        }

        @Override
        public void afterTextChanged(Editable editable) {

        }
    };

    private TextWatcher mgGlicWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            frommg();
        }

        @Override
        public void afterTextChanged(Editable editable) {

        }
    };

    private TextWatcher mmolGlicTextWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                frommMol();
        }

        @Override
        public void afterTextChanged(Editable editable) {

        }
    };

}


Hope this will help you.

票数 4

Stack Overflow用户

发布于 2017-02-08 08:58:59

看起来，你在做你的操作，即使你没有任何文本要处理..。我建议，在执行editTextView ()；操作之前，对thefromPercent执行空/空检查。希望这能有所帮助。

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/42108052

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