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我有一個SQLite db，我希望在ListView中看到所有元素。但是我想讓每一行都可點擊。這個怎麼做？下面是代碼： 然後..另一個問題..我有一個活動，我可以通過選項菜單啓動，它添加或從數據庫中刪除數據..我想自動更新列表，當我回到這個活動。 。我如何更改代碼？使用onClick監聽器在每個項目上創建一個列表
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);
}
}
編輯
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
adapter.notifyDataSetChanged();
//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);
CharSequence text = "Workflow scelto!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(getApplicationContext(), text, duration);
toast.show();
c.requery();
}
});
我不明白.. – darkmax
什麼ü不明白？ – MAC
我必須把那個代碼放在哪裏？ – darkmax