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In meinem Code benutze ich simple editText und textView, benutze editText get value und berechne in main.java. Und schreiben Sie das Ergebnis bei textview.EditText und TextView usw.
Aber das Problem in App läuft, wird es
Verursacht durch: java.lang.NullPointerException
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Bei com.example .jk.kktae0034_sec.MainActivity. (MainActivity.java:52)
In der Leitung 52 ist, dass
TextView recText = (TextView) findViewById (R.id.rec_WH); //here is first error
...
EditText editFck = (EditText) findViewById (R.id.fck); //if first error is // than here is occur error
public class MainActivity extends AppCompatActivity {
Button btnCal;
TextView recText = (TextView)findViewById(R.id.rec_WH);
TextView wheelStr = (TextView)findViewById(R.id.wheelStr);
TextView ironStr = (TextView)findViewById(R.id.ironStr);
EditText editFck = (EditText)findViewById(R.id.fck);
EditText editFy = (EditText)findViewById(R.id.fy);
EditText edit_life_load = (EditText)findViewById(R.id.life_load);
EditText edit_dead_load = (EditText)findViewById(R.id.dead_load);
EditText editL = (EditText)findViewById(R.id.l);
EditText editRatio = (EditText)findViewById(R.id.ratio);
double b, d, roh, Mn, Mu, pi=0.85, w, L, fy, fck, roh_max, roh_min, h, a, c, beta1, strain_t, As;
double life_load, dead_load, ratio;
double AA[][] = {
{9.53,71.3,142.6,213.9,285.2,356.5,427.8,499.1,570.4,641.7,713},
{12.7,126.7,253.4,380,1,506.8,633.5,760.2,886.9,1014,1140},
{15.9,198.6,397.2,595.8,794.4,993.0,1191,1390,1589,1787,1986},
{19.1,286.5,573.0,859.5,1146,1433,1719,2006,2292,2579,2865},
{22.2,387.1,774.2,1161,1548,1935,2322,2710,3097,3484,3871},
{25.4,506.7,1013.4,1520,2027,2534,3040,3547,4054,4560,5067},
{28.6,642.4,1285,1927,2570,3212,3854,4497,5139,5782,6424},
{31.8,794.2,1588,2383,3177,3971,4765,5559,6354,7148,7942},
{34.9,956.6,1913,2870,3826,4783,5740,6696,7653,8609,9566},
{38.1,1140,2280,3420,4560,5700,6840,7980,9120,10260,11400}
};
int num[] = {10,13,16,19,22,25,29,32,35,38 };
public void settingHeight(int i){
int j, cnt=0;
h = d + 0.5 * AA[i][0] + 12.7 + 40;
for(j = 0; j < 10000; j++){
if(j*10 > h){
h = j*10;
cnt++;
break;
}
if(cnt > 0)
break;
}
d = h - (0.5 * AA[i][0] + 12.7 + 40);
}
void reSetting(){
a = As * fy/(0.85 * fck * b);
c = a/beta1;
strain_t = (d - c)/c * 0.003;
if (strain_t > 0.005)
pi = 0.85;
else if (strain_t > 0.002)
pi = 0.65 + (0.0043 - 0.002) * 200/3;
else
pi = 0.65;
Mn = As * fy * (d - a/2);
Mu = pi * Mn;
recText.setText("B = "+String.format("%.2f", b)+"mm, D = "+String.format("%.2f", d)+"mm");
wheelStr.setText("Mu = "+String.format("%.2f", Mu/1000000)+"KN*m");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fck = Double.parseDouble(editFck.getText().toString());
fy = Double.parseDouble(editFy.getText().toString());
life_load = Double.parseDouble(edit_life_load.getText().toString());
dead_load = Double.parseDouble(edit_dead_load.getText().toString());
L = Double.parseDouble(editL.getText().toString());
ratio = Double.parseDouble(editRatio.getText().toString());
btnCal = (Button)findViewById(R.id.btnCal);
btnCal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//steel ratio
roh = 0.85 * 0.85 * fck/fy * 0.003/(0.003 + 0.005);
//main
w = 1.2 * dead_load + 1.6 * life_load;
Mu = w * L*L/8;
//setting side
int i, cnt = 0;
double bdd;
bdd = Mu*1000000/(pi*roh*fy*(1 - 0.59*roh*fy/fck));
bdd = bdd/(ratio*ratio);
b = Math.pow(bdd,0.33333333);
for (i = 1;i<=10000;i++) {
if (i * 10 > b) {
b = i * 10;
cnt++;
break;
} if (cnt > 0)
break;
}
d = b * ratio;
//setting steel
int x, y, cnt_1, cnt_2;
double Ass;
Ass = roh * b * d;
for (x = 0; x < 10; x++) {
for (y = 0; y < 10; y++) {
if (AA[x][y] >= Ass) {
roh_max = 0.85 * 0.85 * fck/fy * 0.003/0.007;
if (0.25 * Math.sqrt(fck)/fy > 1.4/fy)
roh_min = 1.4/fy;
else
roh_min = 0.25 * Math.sqrt(fck)/fy;
roh = AA[x][y]/b/d;
if (roh > roh_min && roh < roh_max) {
cnt_2 = y;
cnt_1 = x;
As = AA[x][y];
ironStr.setText("철근"+cnt_2+" -D "+num[cnt_1]);
settingHeight(cnt);
reSetting();
}
}
}
}
}
});
}
}
Layout-
<RelativeLayout
android:id="@+id/mainRelayout">
<RelativeLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/input_text_Layout">
<TextView
android:id="@+id/life_load_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Life_Load"
android:textSize="15pt"/>
<TextView
android:id="@+id/dead_load_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dead_Load"
android:textSize="15pt"
android:layout_below="@+id/life_load_text"/>
<TextView
android:id="@+id/l_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="L"
android:textSize="15pt"
android:layout_below="@+id/dead_load_text"/>
<TextView
android:id="@+id/fck_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Fck"
android:textSize="15pt"
android:layout_below="@+id/l_text"/>
<TextView
android:id="@+id/fy_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Fy"
android:textSize="15pt"
android:layout_below="@+id/fck_text"/>
<TextView
android:id="@+id/ratio_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ratio"
android:textSize="15pt"
android:layout_below="@+id/fy_text"/>
</RelativeLayout>
<RelativeLayout
android:id="@+id/input_Layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_toRightOf="@+id/input_text_Layout">
<EditText
android:id="@+id/life_load"
android:labelFor="@+id/life_load"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10" />
<EditText
android:id="@+id/dead_load"
android:labelFor="@+id/dead_load"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:layout_below="@+id/life_load"/>
<EditText
android:id="@+id/l"
android:labelFor="@+id/l"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:layout_below="@+id/dead_load"/>
<EditText
android:id="@+id/fck"
android:labelFor="@+id/fck"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:layout_below="@+id/l"/>
<EditText
android:id="@+id/fy"
android:labelFor="@+id/fy"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:layout_below="@+id/fck"/>
<EditText
android:id="@+id/ratio"
android:labelFor="@+id/ratio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:layout_below="@+id/fy"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/input_Layout"
android:id="@+id/screen_value">
<TextView
android:id="@+id/rec_WH"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15pt"
android:text="width_height" />
<TextView
android:id="@+id/wheelStr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15pt"
android:text="wheelStrongth"
android:layout_below="@+id/rec_WH"/>
<TextView
android:id="@+id/ironStr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15pt"
android:text="ironStrength"
android:layout_below="@id/wheelStr"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/input_Layout"
android:layout_toRightOf="@+id/screen_value">
<Button
android:id="@+id/btnCal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="calculation" />
<Button
android:id="@+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="next"
android:layout_below="@+id/btnCal"/>
</RelativeLayout>
</RelativeLayout>
Beitrag in onCreate Logcat –
zu setzen Spuren Ich bin nicht sicher, es ist die Lösung für Sie aber ruft die findViewById in onCreate auf, um sicher zu sein, anstatt auf Klassenebene. Weil es NullpointerExceptions verursachen kann. Der Grund ist, dass Sie versuchen, auf eine ID zuzugreifen, die noch nicht erstellt wurde. –
THX für Ihre Hilfe, ich werde in meinem Haus nach der Arbeit tun :) – JKLee