你好我想從 Mainactivity.java 調(diào)用一個(gè)對(duì)象（用戶名，姓名，帖子）到 Main2Activity.java 第一個(gè)布局：用戶在此處輸入名稱，用戶名和帖子，然后單擊按鈕第二個(gè)布局：用戶提供的信息是顯示在頁(yè)面上我想保存名稱、用戶名和帖子以在第二個(gè)布局中使用https://ibb.co/BfsKMgfpublic class MainActivity extends AppCompatActivity { public String username; public String name; public String posts; EditText usernameinput; EditText nameinput; EditText postsinput; Button confirme; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); usernameinput = (EditText)findViewById(R.id.username); nameinput = (EditText)findViewById(R.id.name); postsinput = (EditText)findViewById(R.id.posts); confirme = (Button)findViewById(R.id.confirme); username = usernameinput.getText().toString(); confirme.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { name = nameinput.getText().toString(); posts = postsinput.getText().toString(); Intent otheractivity = new Intent(getApplicationContext(),Main2Activity.class); startActivity(otheractivity); finish(); showToast(name); showToast(username); showToast(posts); } }); } private void showToast(String text){ Toast.makeText(MainActivity.this,text,Toast.LENGTH_SHORT).show(); }}
2 回答
有只小跳蛙
TA貢獻(xiàn)1824條經(jīng)驗(yàn) 獲得超8個(gè)贊
將數(shù)據(jù)從一個(gè)活動(dòng)傳遞到第二個(gè)活動(dòng)的多種方法，例如使用Intent將數(shù)據(jù)從一個(gè)活動(dòng)傳遞到另一個(gè)活動(dòng)，另一種方法使用sharedpreference來(lái)存儲(chǔ)數(shù)據(jù)并將其獲取到任何地方，第三種方法將數(shù)據(jù)存儲(chǔ)在靜態(tài)變量中
使用意圖傳遞數(shù)據(jù)
MainActivity.java
nameEt = (EditText) findViewById(R.id.name_et);
mobileEt = (EditText) findViewById(R.id.mobile_et);
submitBtn = (Button) findViewById(R.id.submit_btn);
submitBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
name=nameEt.getText().toString();
mobile_number=mobileEt.getText().toString();
Intent intent=new Intent(FirstActivity.this,SecondActivity.class);
intent.putExtra("name",name);
intent.putExtra("mobile",mobile_number);
startActivity(intent);
}
});
第二活動(dòng)
nameTv = (TextView) findViewById(R.id.name_tv);
mobileTv = (TextView) findViewById(R.id.mobile_tv);
String name,mobile_number;
//get Intent data
name=getIntent().getStringExtra("name");
mobile_number=getIntent().getStringExtra("mobile");
nameTv.setText(name);
mobileTv.setText(mobile_number);
使用靜態(tài)變量
MainActivity.java 公共靜態(tài)字符串名稱；公共靜態(tài)字符串 mobile_number；
nameEt = (EditText) findViewById(R.id.name_et);
mobileEt = (EditText) findViewById(R.id.mobile_et);
submitBtn = (Button) findViewById(R.id.submit_btn);
submitBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
name=nameEt.getText().toString();
mobile_number=mobileEt.getText().toString();
Intent intent=new Intent(FirstActivity.this,SecondActivity.class);
startActivity(intent);
}
});
SecondActivity.java
nameTv = (TextView) findViewById(R.id.name_tv);
mobileTv = (TextView) findViewById(R.id.mobile_tv);
nameTv.setText(MainActivity.name);
mobileTv .setText(MainActivity.mobile_number);
慕后森
TA貢獻(xiàn)1802條經(jīng)驗(yàn) 獲得超5個(gè)贊
使用意圖將數(shù)據(jù)從一個(gè)活動(dòng)傳遞到另一個(gè)活動(dòng)，或者如果您可以使用片段，則使用捆綁包。按照這些教程 - https://developer.android.com/training/basics/firstapp/starting-activity#java
你必須改變代碼。
Intent intent = new Intent(MainActivity.this,SecondActivity.class);
intent.putStringExtra("key1","editetextvalue")
intent.putStringExtra("key2","editetextvalue2")
startActivity(intent);
and get value in a second activity.
Intent intent = getIntent();
String key = intent.getStringExtra("key1")
please remember if you pass these key exact same get key other not get
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