我通过意向将字符串从另一个传递到主活动,并将其显示为textView。是否有类似的逻辑来填充main上的列表视图?
private Button startQr;
private ListView validList;
private ArrayList<String> strArray;
private ArrayAdapter<String> adapter;
// private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_caffe_list);
validList = (ListView)findViewById(R.id.listView);
startQr = (Button)findViewById(R.id.scanButton);
strArray = new ArrayList<>();
adapter = new ArrayAdapter<String>(getApplicationContext(),android.
R.layout.simple_expandable_list_item_1, strArray);
validList.setAdapter(adapter);
startQr.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(First.this, Second.class);
startActivity(i);
}
});
Intent intent = getIntent();
String message = intent.getStringExtra(SecondActivity.EXTRA_MESSAGE);
//textView = (TextView)findViewById(R.id.textView1);
//textView.setText(message);
第二类:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_activity);
btn = (Button)findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getCode();
finish();
}
});
}
public void getCode() {
Intent intent = new Intent( Secondclass.this, First.class);
EditText editText = (EditText) findViewById(R.id.editText);
String array = editText.getText().toString();
intent.putExtra(EXTRA_ARRAY, array);
startActivity(intent);
}
它只适用于一个editText。
如果您想从main中填充ListView
,您应该发送一个Intent
但这次你需要额外发送ArrayList<String>
因此,您需要实现以下代码来发送Intent:
static final String EXTRA_ARRAY = "com.package.app.STRARRAY";
private ArrayList<String> strArray = new ArrayList<>();
Intent intent = new Intent(getActivity(), Second.class);
intent.putExtra(EXTRA_ARRAY, strArray);
startActivity(intent);
为了接收意图,您需要实现以下代码:
static final String EXTRA_ARRAY = "com.package.app.STRARRAY";
Intent intent = getIntent();
ArrayList<String> strArray = intent.getStringArrayListExtra(EXTRA_ARRAY);
不要从第一个Activity
调用startActivityForResult(i,REQUEST_CODE);
来调用startActivity(i);
。这将有助于您倾听Second Activity
所说的内容/结果。
结果将以Intent
的形式被接收。您需要在First Activity
中@Override
onActivityResult()
。
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// Check which request we're responding to
if (requestCode == REQUEST_CODE) {
// Make sure the request was successful
if (resultCode == RESULT_OK) {
// The user picked a contact.
// The Intent's data Uri identifies which contact was selected.
// Do something with the contact here (bigger example below)
}
}
}
查看Android文档,了解有关如何获得结果的更多信息。
现在要设置结果,在第二个活动中,您需要调用setResult()
。
Bundle data = new Bundle();
data.putString("data", "here goes you data");
Intent intent = new Intent();
intent.putExtras(data);
setResult(RESULT_OK, intent);
finish();
在CCD_ 14将数据发送到被调用的CCD_ 15之后调用CCD_。
希望它能有所帮助!