java - 跨 Activity 发送整数显示 0

Question

主要 Activity

            ...
            ...
            locationsList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                Log.i("ID SENT: ",  toString().valueOf(i));
                mapsIntent.putExtra("number", i );
                startActivity( mapsIntent );
            }
        });

map Activity

        ...
        Intent intent = new Intent(getApplicationContext(), MainActivity.class);
        Bundle bundle = intent.getExtras();
        if ( bundle != null ) {

            int id = getIntent().getIntExtra( "number", 0);
            Log.i("LOCATION MARKED: ", id );
           }

假设我点击了 ListView 上的项目 2，它在日志上显示“ID SENT: 2”，但在 MapsActivity 上它显示位置标记:0。在 ListView 上尝试了不同的项目，但仍然收到 0。

完整代码:

        Intent mapsIntent = getIntent();
        Bundle bundle = mapsIntent.getExtras();
        if ( bundle != null ) {

            int id = mapsIntent.getIntExtra( "number", 0);
            myLocations = (ArrayList<String>) bundle.getStringArrayList("locations");
            vLoc1 = (ArrayList<String>) bundle.getStringArrayList("loc1");
            vLoc2 = (ArrayList<String>) bundle.getStringArrayList("loc2");
            Log.i("LOCATION MARKED: ", id + " "  + myLocations.get( id ) + " " +  vLoc1.get( id ) + " " + vLoc2.get( id ));

MainActivity(再次)是的

    @Override
    protected void onPause() {
        super.onPause();
        if (myLocations.size() > 0 ) {
            Intent intent = new Intent(getApplicationContext(), MapsActivity.class);
            intent.putExtra("locations", myLocations);
            intent.putExtra("loc1", vLoc1);
            intent.putExtra("loc2", vLoc2);
            startActivity(intent);
            finish();
        }
    }

Answer 1

尝试:

声明全局 Intent mapIntent。

在主要 Activity 中:

@Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

            Log.i("ID SENT: ",  toString().valueOf(i));
            mapsIntent = = new Intent(MainActivity.this, MapsActivity.class);
            mapsIntent.putExtra("number", i );
            startActivity( mapsIntent );
        }

暂停方法:

@Override
        protected void onPause() {
        super.onPause();
        if (myLocations.size() > 0 ) {
                mapsIntent = new Intent(MainActivity.this, MapsActivity.class);
                intent.putStringArrayListExtra("locations", myLocations);
                intent.putStringArrayListExtra("loc1", vLoc1);
                intent.putStringArrayListExtra("loc2", vLoc2);
                startActivity(intent);
                finish();
            }
        }

在 map Activity 中:

Intent mapsIntent = getIntent();
        int id = mapsIntent.getIntExtra("number", 0);
        myLocations = intent.getStringArrayListExtra("locations");