我有一个问题,我想一下就行了,调用一个新的活动和按钮重命名为其他名称。
我试过几件事情,没有什么工作,有人可以帮我吗?
我班EditarTimes
:
private AdapterView.OnItemClickListener selecionarTime = new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView arg0, View arg1, int pos, long id) { t = times.get(pos);CadastroTimes cad = new CadastroTimes();CadastroTimes.salvar.setText("Alterar");Intent intent = new Intent(EditarTimes.this, CadastroTimes.class); startActivity(intent); } };
public class CadastroTimes extends AppCompatActivity { private Time t; private timeDatabase db; private EditText edID; private EditText edNome; public Button salvar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_cadastro_times); edID = (EditText) findViewById(R.id.edID); edNome = (EditText) findViewById(R.id.edNome); db = new timeDatabase(getApplicationContext()); salvar = (Button) findViewById(R.id.btnCadastrar); salvar.setText("Cadastrar"); String newString; if (savedInstanceState == null) { Bundle extras = getIntent().getExtras(); if(extras == null) { newString= null; } else { newString= extras.getString("Alterar"); } } else { newString= (String) savedInstanceState.getSerializable("Alterar"); } //button in CadastroTimes activity to have that String as text System.out.println(newString + " AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"); salvar.setText(newString); } public void salvarTime(View v) { t = new Time(); t.setNome(edNome.getText().toString()); if (salvar.getText().equals("Alterar")) { db.atualizar(t); exibirMensagem("Time atualizado com sucesso!"); } else { db.salvar(t); exibirMensagem("Time cadastrado com sucesso!"); } Intent intent = new Intent(this, EditarTimes.class); startActivity(intent); } private void limparDados() { edID.setText(""); edNome.setText(""); edNome.requestFocus(); } private void exibirMensagem(String msg) { Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show(); } }
public class EditarTimes extends AppCompatActivity { private Time t; private List times; private timeDatabase db; private ListView lvTimes; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_editar_times); lvTimes = (ListView) findViewById(R.id.lvTimes); lvTimes.setOnItemClickListener(selecionarTime); lvTimes.setOnItemLongClickListener(excluirTime); times = new ArrayList(); db = new timeDatabase(getApplicationContext()); atualizarLista(); } private void excluirTime(final int idTime) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Excluir time?") .setIcon(android.R.drawable.ic_dialog_alert) .setMessage("Deseja excluir esse time?") .setCancelable(false) .setPositiveButton(getString(R.string.sim), new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { if (db.deletar(idTime)) { atualizarLista(); exibirMensagem(getString(R.string.msgExclusao)); } else { exibirMensagem(getString(R.string.msgFalhaExclusao)); } } }) .setNegativeButton(getString(R.string.nao), new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); builder.create(); builder.show(); atualizarLista(); } private void atualizarLista() { times = db.listAll(); if (times != null) { if (times.size() > 0) { TimeListAdapter tla = new TimeListAdapter( getApplicationContext(), times); lvTimes.setAdapter(tla); } } } private AdapterView.OnItemClickListener selecionarTime = new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView arg0, View arg1, int pos, long id) { t = times.get(pos); Intent intent = new Intent(EditarTimes.this, CadastroTimes.class); String strName = "Alterar"; intent.putExtra("Alterar", strName); startActivity(intent); //preecherDados(t); } }; private AdapterView.OnItemLongClickListener excluirTime = new AdapterView.OnItemLongClickListener() { public boolean onItemLongClick(AdapterView arg0, View arg1, int pos, long arg3) { excluirTime(times.get(pos).getId()); return true; } }; /*private void preecherDados(Time time) { edID.setText(String.valueOf(time.getId())); edNome.setText(time.getNome()); }*/ private void exibirMensagem(String msg) { Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show(); } public void telaCadastrar(View view) { Intent intent = new Intent(this, CadastroTimes.class); startActivity(intent); } public void botaoSair(View view) { Intent intent = new Intent(this, TelaInicial.class); startActivity(intent); } }
你可以通过按钮标题意图以CadastroTimes
Intent intent = new Intent(EditarTimes.this, CadastroTimes.class);
intent.putExtra("buttontxt","Changed Text");
startActivity(intent);
然后在CadastroTimes.java
设置按钮来,你通过了新的价值的文本。该代码如下:
button = (Button)findViewById(R.id.button); // This is your reference from the xml. button is my name, you might have your own id given already.
Bundle extras = getIntent().getExtras();
String value = ""; // You can do it in better and cleaner way
if (extras != null) {
value = extras.getString("buttontxt");
}
button.setText(value);
千万记得要做到在onCreate
setContentView
后
//From Activity
Intent intent = new Intent(EditarTimes.this, CadastroTimes.class);
intent.pueExtra("change_tag", "text to change");
startActivity(intent)
//To Activity
public void onCreate(..){
Button changeButton = (Button)findViewById(R.id.your_button);
// Button to set received text
Intent intent = getIntent();
if(null != intent &&
!TextUtils.isEmpty(intent.getStringExtra("change_tag"))) {
String changeText = intent.getStringExtra("change_tag");
// Extracting sent text from intent
changeButton.setText(changeText);
// Setting received text on Button
}
}
对不起,我有点晚了。不过,我希望会帮助你。
1:使用intent.putExtra()
从一个活动共享一个值的另一活性,如:
在ActivityOne.class:
Intent intent = new Intent(getApplicationContext(), ActivityTwo.class);
intent.putExtra("key", "value");
intent.startActivity();
在ActivityTwo.class:
Intent intent = getIntent();
String var = intent.getStringExtra("key");
2:编程按钮修改文本:
btn_object.setText(var);
希望这个能对您有所帮助
为了改变按钮上的文字:
现在,我给你:
与EditarTimes
您listview
活动:
//set setOnItemClickListener
youtListView.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
Intent i = new Intent(EditarTimes.this, CadastroTimes.class);
//text which you want to display on the button to CadastroTimes activity
String strName = "hello button";
i.putExtra("STRING_I_NEED", strName);
}
});
在CadastroTimes
活动,
onCreate()
方法下,得到的文本字符串为: -
String newString;
if (savedInstanceState == null) {
Bundle extras = getIntent().getExtras();
if(extras == null) {
newString= null;
} else {
newString= extras.getString("STRING_I_NEED");
}
} else {
newString= (String) savedInstanceState.getSerializable("STRING_I_NEED");
}
//在CadastroTimes活动按钮以具有字符串作为文本yourButton.setText(newString);
如果你想改变的值从不做通过意向不走活动,你可以使用文件来保存价值的文件,或者你有多个值,使用数据库的OnCreate访问值设置文本的价值....
就我而言,我不得不从EditText
风格Dialog
,然后接到了一个Activity
检索到的..我的例子类似于上面的一些答案,这是也是可行的发送Service
值。
TimerActivity.class
public void buttonClick_timerOK(View view) {
// Identify the (EditText) for reference:
EditText editText_timerValue;
editText_timerValue = (EditText) findViewById(R.id.et_timerValue);
// Required 'if' statement (to avoid NullPointerException):
if (editText_timerValue != null) {
// Continue with Button code..
// Convert value of the (EditText) to a (String)
String string_timerValue;
string_timerValue = editText_timerValue.getText().toString();
// Declare Intent for starting the Service
Intent intent = new Intent(this, TimerService.class);
// Add Intent-Extras as data from (EditText)
intent.putExtra("TIMER_VALUE", string_timerValue);
// Start Service
startService(intent);
// Close current Activity
finish();
} else {
Toast.makeText(TimerActivity.this, "Please enter a Value!", Toast.LENGTH_LONG).show();
}
}
然后我的服务类中,我检索的值,并用它里面onStartCommand
。
TimerService.class
// Retrieve the user-data from (EditText) in TimerActivity
intent.getStringExtra("TIMER_VALUE"); // IS THIS NEEDED, SINCE ITS ASSIGNED TO A STRING BELOW TOO?
// Assign a String value to the (EditText) value you retrieved..
String timerValue;
timerValue = intent.getStringExtra("TIMER_VALUE");
// You can also convert the String to an int, if needed.
// Now you can reference "timerValue" for the value anywhere in the class you choose.
希望我的贡献会有所帮助! 编码愉快!
好了,第一步是采取你想要的按钮,使公共静态对象(并把它在类的顶部)。
public static Button button;
然后你就可以操作,在另一个类使用此:
ClassName.button.setText("My Button");
在你的情况下,
CadastroTimes.salvar.setText("Alterar");