Question

我正在尝试制作基本的点击计数器应用程序，它会计算点击次数，但我希望有一个 EditText 来设置所需的数字并点击，它会加倍向上并显示在 TextView 。

我尝试了accCount + tCount ++;

但它不起作用，

我尝试了另一个名为moon的用户提供的解决方案，它非常有用但是它本身就添加了自己的值。我做错了什么？

代码：

XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.patta.drawerrrrr.MainActivity"
tools:showIn="@layout/app_bar_main">

<TextView
    android:id="@+id/touchCountText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_above="@+id/editText"
    android:layout_alignParentStart="true"
    android:background="@android:color/black"
    android:gravity="center_horizontal"
    android:onClick="touchFunc"
    android:text="@string/_0"
    android:textColor="#ffffff"
    android:textSize="150sp" />

<EditText
    android:id="@+id/editText"
    android:layout_width="50dp"
    android:layout_height="wrap_content"
    android:layout_above="@+id/textView"
    android:cursorVisible="false"
    android:layout_centerHorizontal="true"
    android:ems="10"
    android:inputType="number" />

<TextView
    android:id="@+id/textView"
    android:layout_width="match_parent"
    android:layout_height="59dp"
    android:layout_above="@+id/adView"
    android:layout_alignParentStart="true"
    android:background="#ff1e00"
    android:gravity="center"
    android:onClick="reset"
    android:paddingBottom="16dp"
    android:paddingTop="16dp"
    android:text="RESET"
    android:textColor="#ffffff"
    android:textStyle="bold"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="400dp" />

JAVA：

    public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

    Vibrator vibrator;
    EditText editText;
    TextView touchCountText;
    int tCount = 0;
    int accCount = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        vibrator = (Vibrator) this.getSystemService(Context.VIBRATOR_SERVICE);
        touchCountText = findViewById(R.id.touchCountText);
        editText = findViewById(R.id.editText);

        int accCount = Integer.parseInt(editText.getText().toString());


    }

    public void touchFunc (View v){
        tCount++;
        touchCountText.setText(""+tCount);
        vibrator.vibrate(40);
    }
    public void reset (View v){
        tCount = 0;
        touchCountText.setText(""+tCount);
        vibrator.vibrate(100);
    }
}

Answer 1

试试这段代码，

Vibrator vibrator;
EditText editText;
TextView touchCountText;
int tCount = 0;
static double accCount = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    vibrator = (Vibrator) this.getSystemService(Context.VIBRATOR_SERVICE);
    touchCountText =(TextView) findViewById(R.id.touchCountText);
    editText = (EditText)findViewById(R.id.editText);

    DrawerLayout drawer =(DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle
            (this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);


}

public void touchFunc (View v){
    if(!editText.getText().toString().isEmpty() && tCount==0)
        accCount = Double.parseDouble(editText.getText().toString());
    else
        Toast.makeText(getApplicationContext(),"editText is empty",Toast.LENGTH_SHORT).show();
    tCount++;
    Log.d("value",String.valueOf(accCount));
    touchCountText.setText(String.valueOf((double)tCount*accCount));
    vibrator.vibrate(40);
}
public void reset (View v){
    tCount = 0;
    accCount=0; 
    touchCountText.setText(String.valueOf(tCount));
    vibrator.vibrate(100);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)){
        tCount--;
        touchCountText.setText(String.valueOf((double)tCount*accCount));
        vibrator.vibrate(40);
    }
    if ((keyCode == KeyEvent.KEYCODE_VOLUME_UP)){
        tCount++;
        touchCountText.setText(String.valueOf((double)tCount*accCount));
        vibrator.vibrate(40);
    }
    if ((keyCode == KeyEvent.KEYCODE_BACK)) {
        onBackPressed();
    }
    return false;
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {

    int id = item.getItemId();

    if (id == R.id.nav_camera) {

    } else if (id == R.id.nav_share) {

    }

    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
  }
}

Answer 2

如果我没有误解你的问题

int valueFromEditText=0;


editText.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        valueFromEditText=Integer.parseInt(editText.getText().toString().trim());
        yourTextViewToDisplayDoubleValue.setText(valueFromEditText*2+"");

        }
    });

Answer 3

你这样做是错误的

editText = findViewById(R.id.editText);
int accCount = Integer.parseInt(editText.getText().toString());

<强>原因：

当EditText刚刚初始化时，你不能简单地从EditText获取文本并将空文本解析成Integer，它可能会抛出异常。

所以你应该首先检查或者只是初始化EditText，默认值为 Zero 或者是第一次，然后单击某个按钮或者做类似的事情。

int count = 0;

 @Override
    protected void onCreate(Bundle savedInstanceState) {
    //your other code ...............
    button.setOnClickListener(this);
    //default value
    editText.setText(String.valueOf(count));   
 }

@Override
public void onClick(View view){
 //button click
 count++
 //double the value and show in editText
 editText.setText(String.valueOf(count*2))
}

如何使用edittext（数字十进制）到整数

3 个答案: