java - 我想将整数，字符串，对象， double ，位图，HashMap从一个 Activity 发送到android中的另一个 Activity

Question

我开始使用android，我想将String，Object，double，ArrayList从一个 Activity 发送到另一个 Activity 。我已经完成了整数，但是当我想发送其他数据(例如对象和 ArrayList)时我遇到了问题。

发件人 Activity

Intent myIntent = new Intent(SenderActivity.this, ReceiverActivity.class);
myIntent.putExtra("intVariableName", intValue);
startActivity(myIntent);

接收者 Activity

Intent mIntent = getIntent();
int intValue = mIntent.getIntExtra("intVariableName", 0); 

Answer 1

传递 double 据:

发件人 Activity

Intent myIntent = new Intent(SenderActivity.this, ReceiverActivity.class);
myIntent.putExtra("doubleVariableName", doubleValue);
startActivity(myIntent);

接收者 Activity

Intent mIntent = getIntent();
double doubleValue = mIntent.getDoubleExtra("doubleVariableName", 0.00); // set 0.00 as the default value if no value for doubleVariableName found

传递字符串数据:

发件人 Activity

Intent myIntent = new Intent(SenderActivity.this, ReceiverActivity.class);
myIntent.putExtra("stringVariableName", stringValue);
startActivity(myIntent);

接收者 Activity

Intent mIntent = getIntent();
String stringValue = mIntent.getExtras().getString("stringVariableName");

或

Intent mIntent = getIntent();
String stringValue = mIntent.getStringExtra("stringVariableName");

传递ArrayList数据:

发件人 Activity

Intent myIntent = new Intent(SenderActivity.this, ReceiverActivity.class);
myIntent.putStringArrayListExtra("arrayListVariableName", arrayList);
startActivity(myIntent);

接收者 Activity

Intent mIntent = getIntent();
arrayList = mIntent.getStringArrayListExtra("arrayListVariableName");

传递对象数据:

发件人 Activity

Intent myIntent = new Intent(SenderActivity.this, ReceiverActivity.class);
myIntent.putExtra("ObjectVariableName", yourObject);
startActivity(myIntent);

接收者 Activity

Intent mIntent = getIntent();
yourObj = mIntent.getSerializableExtra("ObjectVariableName");

注意:请记住您的自定义类必须实现可序列化接口(interface)。

传递HashMap数据:

发件人 Activity

HashMap<String, String> hashMap;
Intent mIntent = new Intent(SenderActivity.this, ReceiverActivity.class);
mIntent.putExtra("hashMap", hashMap);
startActivity(mIntent);

接收者 Activity

Intent mIntent = getIntent();    
HashMap<String, String> hashMap = (HashMap<String, String>)
mIntent.getSerializableExtra("hashMap");

传递位图数据:

发件人 Activity

Intent myIntent = new Intent(SenderActivity.this, ReceiverActivity.class);
myIntent.putExtra("image",bitmap);
startActivity(mIntent);

接收者 Activity

Intent mIntent = getIntent();
Bitmap bitmap = mIntent.getParcelableExtra("image");