Question

嗨，我是新来的，首先我想为我的语言道歉。我想创建我的第一个Android应用程序，并且我正在努力解决一些问题。 MainActivity，它代表我的主屏幕，包含两个按钮和spinner。在微调器用户可以选择一个文本文件，选择后应该触发spinnerActivity（带有打开的文本文件的屏幕）。我发现问题，因为并非每个来自微调器的记录触发活动与文本文件我想要的（我想要一个触发器文件和其他带有空TextView的触发器屏幕）。这是spinnerActivity的布局

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

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
             android:orientation="vertical"
            >

    <TextView
        android:id="@+id/textView2"
        android:layout_width="199dp"
        android:layout_height="89dp"
        android:layout_below="@+id/editText1"
        android:layout_centerHorizontal="true"
        android:text="nie dziala" />

     <TextView
        android:id="@+id/proximityTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"            
        android:text="0.0"
        android:textAppearance="?android:attr/textAppearanceLarge"/>
        </LinearLayout>
        </ScrollView>
</LinearLayout>

主要活动代码

package com.example.myapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;

public class MainActivity extends ActionBarActivity  implements OnItemSelectedListener {

        @Override
 protected void onCreate(Bundle savedInstanceState)
{
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Button click=(Button)findViewById(R.id.button2);


        click.setOnClickListener(new View.OnClickListener(){ //nowy actionlistener
        @Override
        public void onClick(View v) {
        Intent activitylauncher=new Intent(MainActivity.this,AboutActivity.class);
        //tworzenie nowej intencji Create an intent for a specific component.
        startActivity(activitylauncher);
        }                      
        });
    final Button click2=(Button)findViewById(R.id.button1);
       click2.setOnClickListener(new View.OnClickListener() { //nowy actionlistener
    @Override
        public void onClick(View v) {
        Intent activitylauncher=new Intent(MainActivity.this,RandomActivity.class);
        //tworzenie nowej intencji Create an intent for a specific component.
        startActivity(activitylauncher);
                }
                });  
        Spinner spinner = (Spinner) findViewById(R.id.spinner1);
                 // Create an ArrayAdapter using the string array and a default spinner layout
                ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,R.array.recipie_array, android.R.layout.simple_spinner_item);
                // Specify the layut to use when the list of choices appears
                adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                 // Apply the adapter to the spinner
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);

}      

        public void onItemSelected(AdapterView<?> parent, View view,
            int pos, long id) {


        // String i=Integer.toString(pos);
                 if(pos==1)
                 {

         Intent intent3 = new Intent(MainActivity.this, SpinnerActivity.class);

                       intent3.putExtra("txt",(pos));
                         startActivity(intent3);
                 }

                 if(pos==2)
                 {

         Intent intent3 = new Intent(MainActivity.this, SpinnerActivity.class);

                         startActivity(intent3);
                 }
                 if(pos==1)
                 {

         Intent intent3 = new Intent(MainActivity.this, SpinnerActivity.class);

                         startActivity(intent3);
                 }

         }

        // An item was selected. You can retrieve the selected item using
        // parent.getItemAtPosition(pos)


    public void onNothingSelected(AdapterView<?> parent) {
        // Another interface callback
    }





   @Override
        public boolean onCreateOptionsMenu(Menu menu) {
       // Inflate the menu; this adds items to the action bar if it is present.
       getMenuInflater().inflate(R.menu.main, menu);
        return true;
                }



   @Override

 public boolean onOptionsItemSelected(MenuItem item){  
                // Handle action bar item clicks here. The action bar will  
                // automatically handle clicks on the Home/Up button, so long
                // as you specify a parent activity in AndroidManifest.xml.
         int id = item.getItemId();
    if (id == R.id.action_settings) {
          return true;
                                                                }
        return super.onOptionsItemSelected(item);
                }
}

和spinneractivity的代码

package com.example.myapp;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class SpinnerActivity extends ActionBarActivity implements SensorEventListener  {
TextView proxText;
SensorManager sm;
Sensor proxSensor;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_spinner);
                //proximitymeter
                sm=(SensorManager)getSystemService(SENSOR_SERVICE);
                proxSensor=sm.getDefaultSensor(Sensor.TYPE_PROXIMITY);
                proxText=(TextView)findViewById(R.id.proximityTextView);
                sm.registerListener(this,proxSensor,SensorManager.SENSOR_DELAY_NORMAL);



                Intent intent3 = getIntent();
                 int value = intent3.getIntExtra("txt", 0);
                //finish();
                if (value==1)
                {
                        open("przepis1.txt");
                }
                if (value==2)
                {
                open("przepis2.txt");
                }
                if (value==3)
                {
                open("przepis3.txt");
                }


        }
public void open(String name){
          File sdcard = Environment.getExternalStorageDirectory();

          //Get the text file

          File file = new File(sdcard,name);

          //Read text from file
          StringBuilder text = new StringBuilder();

          try {
              BufferedReader bufor = new BufferedReader(new FileReader(file));
              String line;

              while ((line = bufor.readLine()) != null) {
                  text.append(line);
                  text.append('\n');
              }
              bufor.close();
          }
          catch (IOException e) {
              //You'll need to add proper error handling here
          }

          //Find the view by its id
          TextView tv = (TextView)findViewById(R.id.textView2);

          //Set the text
          tv.setText(text);
        }
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
                // Inflate the menu; this adds items to the action bar if it is present.
                getMenuInflater().inflate(R.menu.spinner, menu);
                return true;
        }
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
                // Handle action bar item clicks here. The action bar will
                // automatically handle clicks on the Home/Up button, so long
                // as you specify a parent activity in AndroidManifest.xml.
                int id = item.getItemId();
                if (id == R.id.action_settings) {
                        return true;
                }
                return super.onOptionsItemSelected(item);
        }
        @Override
        public void onSensorChanged(SensorEvent event) {
                // TODO Auto-generated method stub

                //proxText.setText(String.valueOf(event.values[0]));

        }
        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {
                // TODO Auto-generated method stub

        }



}

有人可以看看这个并帮我找到错误吗？谢谢

Answer 1

位置从0开始，我认为问题在于条件，你可以这样写 -

        public void onItemSelected(AdapterView<?> parent, View view,
                               int pos, long id) {
        Intent intent = new Intent(MainActivity.this, SpinnerActivity.class);
        intent.putExtra("txt", pos + 1);
        startActivity(intent);
    }

将数据从一个活动发送到另一个活动

1 个答案: