我制作了一个 Android 应用程序，其中我在 5 个不同的活动中从用户那里接收文本和数字（十进制）值，然后将它们存储在我的共享首选项中。我可以使用 editor(); 恢复所有值；在之前的所有 5 个活动中。
现在
在最终计算活动中，我正在恢复所有用户输入（文本和数字）并将它们存储在字符串和双精度变量中。在下面发布的代码活动中执行计算；
问题
我无法使用 getText 在 textview 中查看结果。
有什么遗漏吗？
public class Xcalculateforall extends Activity {
Button qcbut, coatsolbut;
TextView TVqcbut, TVcoatsolbut, TVbrand;
double tdrum, rqctotal;
String a;
public static String FILE1 = "MyPrefsFile";
SharedPreferences abcPref;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.resultmain);
qcbut = (Button) findViewById(R.id.bQCS);
coatsolbut = (Button) findViewById(R.id.bCSP);
TVqcbut = (TextView) findViewById(R.id.tvQCS);
TVbrand = (TextView) findViewById(R.id.tvBrand);
TVcoatsolbut = (TextView) findViewById(R.id.tvCSP);
abcPref = this.getSharedPreferences(FILE1, 0);
a = abcPref.getString("tA", ""); //receives text value and store in 'a' String
double k = Integer.parseInt(abcPref.getString("tsK", ""));
double l = Integer.parseInt(abcPref.getString("tsL", ""));
double m = Integer.parseInt(abcPref.getString("tsM", ""));
double n = Integer.parseInt(abcPref.getString("tsN", ""));
double o = Integer.parseInt(abcPref.getString("tsO", ""));
double p = Integer.parseInt(abcPref.getString("tsP", ""));
tdrum = 20 / m;
double samv = (tdrum / k) / l;
double samv2 = (Math.sqrt(samv));
double tsample = ((samv2 + 1) * k) * l;
double rmicro = tsample * n;
double rchem = tsample * o;
double rother = tsample * p;
double rinqc = rmicro + rchem + rother;
rqctotal = rinqc - 2;
qcbut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
TVqcbut.setText(rqctotal + "Days");
TVbrand.setText("" + a);
// Intent results = new Intent("com.traviss.calculate.RESULT");
// startActivity(results);
}
});
}
}
更新查询 --- 我接受用户输入的先前活动
public class G2J extends Activity {
Button two2five, save2;
EditText edtG, edtH, edtI, edtJ, edtK;
int tG, tH, tI, tJ, tK;
String tsG, tsH, tsI, tsJ, tsK;
public static String FileP2 = "MyPrefsFile";
SharedPreferences abcPref;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.g2j);
two2five = (Button) findViewById(R.id.btp2);
edtG = (EditText) findViewById(R.id.etG);
edtH = (EditText) findViewById(R.id.etH);
edtI = (EditText) findViewById(R.id.etI);
edtJ = (EditText) findViewById(R.id.etJ);
edtK = (EditText) findViewById(R.id.etK);
abcPref = getSharedPreferences(FileP2, 0);
edtG.setText(abcPref.getString("tsG", ""));
edtH.setText(abcPref.getString("tsH", ""));
edtI.setText(abcPref.getString("tsI", ""));
edtJ.setText(abcPref.getString("tsJ", ""));
edtK.setText(abcPref.getString("tsK", ""));
two2five.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if ((!edtG.getText().toString().equals(""))
&& (!edtH.getText().toString().equals(""))
&& (!edtI.getText().toString().equals(""))
&& (!edtJ.getText().toString().equals(""))
&& (!edtK.getText().toString().equals(""))) {
abcPref = G2J.this.getSharedPreferences(FileP2, 0);
SharedPreferences.Editor editor = abcPref.edit();
editor.putString("tsG", edtG.getText().toString());
editor.putString("tsH", edtH.getText().toString());
editor.putString("tsI", edtI.getText().toString());
editor.putString("tsJ", edtJ.getText().toString());
editor.putString("tsK", edtK.getText().toString());
editor.commit();
Toast message = Toast.makeText(G2J.this, "Values are saved", 2000);
message.setGravity(Gravity.BOTTOM, 0, 0);
message.show();
Intent openl2p = new Intent("com.traviss.calculate.L2P");
startActivity(openl2p);
}
else {
Toast failz = Toast.makeText(G2J.this,
"Values are not Entered", 2000);
failz.setGravity(Gravity.BOTTOM, 0, 0);
failz.show();
}
};
});
}
}