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我基本上是在尝试创建一个包含 2 个活动的应用程序。在活动 1 中,用户可以在 2 个单独的编辑文本字段中输入 2 个值,我提供了一个微调器下拉项,用户可以使用它选择 2 个值中的任何一个。

如果用户选择选项为 1 并单击提交按钮,用户将显示第二个活动,其值将根据在先前活动中微调对象中选择的 id 显示。

就像如果用户选择 1 ,则显示第一个编辑文本框中的值,如果他选择 2 ,则显示第二个编辑文本框的值。

此外,当用户单击第二个活动中的提交按钮时,根据他在第二个活动的编辑文本字段中输入的值,它将显示在上一个活动的编辑文本框 1 或编辑文本框 2 中。

我无法理解为什么我的应用程序显示出奇怪的行为。请指导我。

第一个活动文件:

package spinnner.intents.understand;

    import android.app.Activity;
    import android.content.Context;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.view.inputmethod.InputMethodManager;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.EditText;
    import android.widget.Spinner;
    import android.widget.TextView;
    import android.widget.Toast;
    import android.widget.AdapterView.OnItemSelectedListener;

    public class TwoAppsActivity extends Activity {
        /** Called when the activity is first created. */
        String [] items = {"1","2"}; 
        //String ch;
        TextView tv;
        EditText et1,et2;
        Spinner spinner;    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

             tv=(TextView) findViewById(R.id.txt);
            et1=(EditText) findViewById(R.id.edittxt1); // value 1
            et2=(EditText) findViewById(R.id.edittxt2); // value 2
            spinner=(Spinner) findViewById(R.id.spin1); // select

            // 

            Intent i3 = getIntent();
            if(i3.getStringExtra("spinner.intents.understand.value1")!=null)
            {
                et1.setText(i3.getStringExtra("spinner.intents.understand.value1"));
            }
            else if(i3.getStringExtra("spinner.intents.understand.value2")!=null)
            {
                et2.setText(i3.getStringExtra("spinner.intents.understand.value2"));
            }
            else
            {
                Toast.makeText(getApplicationContext(), "Enter some text ", Toast.LENGTH_LONG).show();
            }

         // spinner logic
            ArrayAdapter<String> as1 = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_dropdown_item, items);
            as1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            spinner.setAdapter(as1);
            spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

                public void onItemSelected(AdapterView<?> arg0, View arg1,
                        int arg2, long arg3) {
                    // TODO Auto-generated method stub
                    tv.setText(items[arg2]);
                    Toast.makeText(getApplicationContext(), " You selected : "+items[arg2],Toast.LENGTH_LONG).show();
                }

                public void onNothingSelected(AdapterView<?> arg0) {
                    // TODO Auto-generated method stub
                    Toast.makeText(getApplicationContext(), "You selected nothing", Toast.LENGTH_LONG).show();
                }
            });

            //
        }

        public void Submit(View v)
        {
            Intent i = new Intent(this,Second.class);
            startActivity(i);



            //str1 = et1.getText().toString();
            //Toast.makeText(getApplicationContext(), str1, Toast.LENGTH_LONG).show();

        //  str2 = et2.getText().toString();
            //Toast.makeText(getApplicationContext(), str2, Toast.LENGTH_LONG).show();

            //




            if(spinner.getSelectedItem().toString()=="1")
            {
                Toast.makeText(getApplicationContext(), "I am in 1st option", Toast.LENGTH_LONG).show();
                i.putExtra("spinner.intents.understand.value1", et1.getEditableText().toString()); 
                i.putExtra("spinner.intents.understand.Id1", "1");
            }
            else if(spinner.getSelectedItem().toString()=="2")
            {
                Toast.makeText(getApplicationContext(), "I am in 2nd option", Toast.LENGTH_LONG).show();
                i.putExtra("spinner.intents.understand.value2", et2.getEditableText().toString());
                i.putExtra("spinner.intents.understand.Id2", "2");
            }
            else
            {
                Toast.makeText(getApplicationContext(), "You selected nothing!!!", Toast.LENGTH_LONG).show();
            }



        }
    }

第二个活动文件

  package spinnner.intents.understand;

    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.EditText;
    import android.widget.TextView;
    import android.widget.Toast;

    public class Second extends Activity{
          /** Called when the activity is first created. */
            TextView Tv;
            EditText Et;
            @Override
            public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.second);
                //
                Tv=(TextView) findViewById(R.id.txtS1);
                Et=(EditText) findViewById(R.id.edittxtS1);
                //

                Intent i1 = getIntent();                               

                if((i1.getStringExtra("spinner.intents.understand.Id1"))=="1")
                {
                    Toast.makeText(getApplicationContext(), "I am in value 1", Toast.LENGTH_LONG).show();               
                    Et.setText(i1.getStringExtra("spinner.intents.understand.value1"));             
                }           
                else if((i1.getStringExtra("spinner.intents.understand.Id2"))=="2")
                {
                    Toast.makeText(getApplicationContext(), "I am in value 2", Toast.LENGTH_LONG).show();
                    Et.setText(i1.getStringExtra("spinner.intents.understand.value2"));
                }
                else
                {
                    Toast.makeText(getApplicationContext(), "Some mismatch", Toast.LENGTH_SHORT).show();
                }

            }

            public void submit(View v)
            {
                Intent i2 = new Intent(this,TwoAppsActivity.class);
                startActivity(i2);
                if(i2.getStringExtra("Id1")=="1")
                {
                    i2.putExtra("spinner.intents.understand.value1", Et.getEditableText().toString());

                }
                else if(i2.getStringExtra("Id2")=="2")
                {
                    i2.putExtra("spinner.intents.understand.value2", Et.getEditableText().toString());

                }
                else
                {
                    Toast.makeText(getApplicationContext(), "No data to display", Toast.LENGTH_LONG).show();
                }
            }
    }

主文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/txt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <TextView
        android:id="@+id/txt1"
        android:text="Enter value 1:"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <EditText 
        android:id="@+id/edittxt1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

    <TextView
        android:id="@+id/txt2"
        android:text="Enter value 2:"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <EditText 
        android:id="@+id/edittxt2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

    <TextView 
        android:id="@+id/txt3"
        android:text="Select"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <Spinner 
        android:id="@+id/spin1"        
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <Button 
        android:id="@+id/btnsubmit1"
        android:text="Submit"
        android:onClick="Submit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

第二个活动 XML 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView 
        android:id="@+id/txtS1"
        android:text="Value:"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

    <EditText 
        android:id="@+id/edittxtS1"        
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

    <Button 
        android:id="@+id/btnsubmit2"
        android:text="Submit"
        android:onClick="submit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

安卓清单 XML 文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="spinnner.intents.understand"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".TwoAppsActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity 
            android:name=".Second">            
        </activity>
    </application>

</manifest>

如果我的代码看起来太乱了,我也愿意邮寄我的项目。

4

1 回答 1

0

您不应该使用 == 或 != 来比较两个字符串。改用等于:

if(spinner.getSelectedItem().toString().equals("1"))

问候。

于 2013-04-16T07:27:00.370 回答