java - 如何在 ListView 中创建 onClick 选择

Question

我有一个 SQLite 数据库，我想在 ListView 中查看所有元素。但我想让每一行都可以点击。这个怎么做？这是代码:然后..另一个问题..我有一个可以通过选项菜单启动的 Activity ，它可以从数据库中添加或删除数据..我想在返回此 Activity 时自动更新列表..我如何更改代码？.

public class WorkflowChoice extends Activity {

private static final int INIT_JADE_PROFILE = 0;
private static final int MANAGE_DATABASE = 1;
private static final int MODIFY_FILES = 2;
private static final int CHANGE_THEME = 3;
private static final int SHOW_OUTPUT_WORKFLOW = 4;
private LinearLayout properties_container;

private MyDatabase db;
TextView wfsTv;
ListView wfsLv;
private Cursor c;

public MyDatabase getDb() {
    return db;
}
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.choice);

    properties_container = (LinearLayout ) findViewById(R.id.properties_container);

    String host = (String) InitJadeProperties.retrieve(this, getString(R.string.main_container_host), getString(R.string.default_host));
    String port = (String) InitJadeProperties.retrieve(this, getString(R.string.main_container_port), getString(R.string.default_port));

    wfsTv=(TextView)findViewById(R.id.wfsTv);
    ListView wfsLv = (ListView)findViewById(R.id.wfsLv);

    db=new MyDatabase(getApplicationContext());
db.open();  //apriamo il db


if(db.fetchWfs().getCount()==0){//inserimento dati, solo se il db è vuoto

        db.insertWf("WF1", "class1");
        db.insertWf("WF2", "class2");
        db.insertWf("WF3", "class3");
        db.insertWf("WF4", "class4");
        db.insertWf("WF5", "class5"); 

}

c=db.fetchWfs(); // query
startManagingCursor(c);

SimpleCursorAdapter adapter=new SimpleCursorAdapter( //semplice adapter per i cursor
                this, 
                R.layout.wfs, //il layout di ogni riga/prodotto 
                c, 
                new String[]{MyDatabase.WfMetaData.ID,MyDatabase.WfMetaData.WF_NAME_KEY,MyDatabase.WfMetaData.WF_CLASS_KEY},//questi colonne 
                new int[]{R.id.IDTv,R.id.nameTv,R.id.classTv});//in queste views

wfsLv.setAdapter(adapter); //la listview ha questo adapter


//qui vediamo invece come reperire i dati e usarli, in questo caso li stampiamo in una textview

int nameCol=c.getColumnIndex(MyDatabase.WfMetaData.WF_NAME_KEY);  //indici delle colonne
int classCol=c.getColumnIndex(MyDatabase.WfMetaData.WF_CLASS_KEY);       

if(c.moveToFirst()){  //se va alla prima entry, il cursore non è vuoto
        do {

                wfsTv.append("Wf Name:"+c.getString(nameCol)+", Class:"+c.getString(classCol)+"\n"); //estrazione dei dati dalla entry del cursor

                } while (c.moveToNext());//iteriamo al prossimo elemento
}

db.close();
getWindow().setFormat(PixelFormat.RGBA_8888);   //visto che usiamo i gradient, usiamo questo trick (vedi snippet forum)
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DITHER);  

//wfsLv.setBackgroundDrawable(new GradientDrawable(GradientDrawable.Orientation.BOTTOM_TOP, new int[]{Color.RED,Color.parseColor("#f2bf26")}));
//wfsTv.setBackgroundDrawable(new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, new int[]{Color.RED,Color.parseColor("#f2bf26")}));
//definizione ed uso di gradient in modo programmatico


//animazioni in modo programmatico (vedi snippet forum)
Animation a1 = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_PARENT, 1.0f, Animation.RELATIVE_TO_SELF, 0.0f);
a1.setDuration(1000);
a1.setInterpolator(AnimationUtils.loadInterpolator(this, android.R.anim.decelerate_interpolator));
wfsLv.startAnimation(a1);
//entra da sotto


Animation a2 = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_PARENT, -1.0f, Animation.RELATIVE_TO_SELF, 0.0f);
a2.setDuration(1000);
a2.setInterpolator(AnimationUtils.loadInterpolator(this, android.R.anim.decelerate_interpolator));
wfsTv.startAnimation(a2);
//entra da sopra


wfsLv.setClickable(true);
//e affidiamo la gestione del tap/click ad un apposito listener, che ci permetterà di agire sull’elemento cliccato e ricaricare la nostra lista

wfsLv.setOnItemClickListener
       (new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent,
          View v, int position, long id) {
 TextView txtId = (TextView)
          v.findViewById(R.id.wfsTv); 
 c.requery(); 
}
       });

/*wfsTv.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            CharSequence text = "Workflow scelto!";
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(getApplicationContext(), text, duration);
            toast.show();

        }
    });*/



    TextView masterTv = (TextView)findViewById(R.id.masterTv);
    masterTv.setText("Master");
    masterTv.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            startSubActivity();

        }
    });
}
private void startSubActivity(){
Intent intent = new Intent(this, ConfigChoice.class);
startActivity(intent);
}

Answer 1

Android 文档 ListView 教程中有一个示例:http://developer.android.com/resources/tutorials/views/hello-listview.html