Intent 传递数据

Intent 传递数据

@(Android)

Intent 传递简单数据

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基本数据

SYNTAX

数据类型	存数据	取数据
String	putExtra(String name, String value)	getStringExtra(String name)
int	putExtra(String name, int value)	getIntExtra(String name, int defaultValue)
…	…	…

EXAMPLES

数组

SYNTAX

数组类型	存数据	取数据
String	putExtra(String name, String[] value)	getStringArrayExtra(String name)
int	putExtra(String name, int[] value)	getIntArrayExtra(String name)
…	…	…

EXAMPLES

存数据

Intent intent = new Intent(IntentTestActivity.this,IntentDataActivity.class);
intent.putExtra("StringArray",new String[]{"刘备","关羽","张飞"});
// value 可以为其他类型，如 int,float...数组
startActivity(intent);

取数据

Intent intent = getIntent();
String[] strArray = intent.getStringArrayExtra("StringArray");

集合

SYNTAX

数组类型	存数据	取数据
String	putStringArrayListExtra(String name, ArrayList<String> value)	getStringArrayListExtra(String name)
Integer	putIntegerArrayListExtra(String name, ArrayList<Integer> value)	getIntegerArrayListExtra(String name)
…	…	…

EXAMPLES

存数据

Intent intent = new Intent(IntentTestActivity.this,IntentDataActivity.class);
ArrayList<String> strList = new ArrayList<>();
strList.add(0,"刘备");
strList.add(1,"关羽");
strList.add(2,"张飞");
intent.putStringArrayListExtra("StringList",strList);
startActivity(intent);

取数据

Intent intent = getIntent();
ArrayList<String> strList = intent.getStringArrayListExtra("StringList");

Intent 传递对象

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SYNTAX

类型	存数据	取数据
1	putExtra(String name, Serializable value)	getSerializableExtra(String name)
2	putExtra(String name, Parcelable value)	getParcelableExtra(String name)
3	putExtra(String name, Parcelable[] value)	getParcelableArrayExtra(String name)
4	putParcelableArrayListExtra(String name, ArrayList<? extends Parcelable> value)	getParcelableArrayListExtra(String name)
…	…	…

EXAMPLES

存数据

Intent intent = new Intent(IntentTestActivity.this,IntentDataActivity.class);
Student student = new Student("吕布",30);
intent.putExtra("Student",student);
startActivity(intent);

取数据

Intent intent = getIntent();
Student student = intent.getParcelableExtra("Student");

Intent 传递Bitmap

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直接传递

bitmap实现了Parcelable接口，可以直接传递。有大小限制！！（1MB）

发送Bitmap的Activity

Intent intent = new Intent(SendActivity.this, ReceiveActivity.class);
Bitmap bitmap = xxx; //xxx根据实际情况获取
intent.putExtra("BITMAP",bitmap);
startActivity(intent);

接收Bitmap的Activity

Intent intent = getIntent();
if(intent!=null){
    Bitmap bm = intent.getParcelableExtra("BITMAP");
}   

通过Bundle传递

发送Bitmap的Activity

Intent intent = new Intent(SendActivity.this, ReceiveActivity.class);
Bundle bundle = new Bundle();
Bitmap bitmap = xxx; //xxx根据实际情况获取
bundle.putParcelable("BITMAP", bitmap);
intent.putExtra("bundle", bundle);
startActivity(intent);

接收Bitmap的Activity

Intent intent = getIntent();
if(intent!=null){
    Bundle bundle = intent.getBundleExtra("bundle");
    Bitmap bm = bundle.getParcelable("BITMAP");
}   

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通过byte[]传递

Bitmap和byte[]相互转换

Bitmap转byte[]

private byte[] convertBitmap2Bytes(Bitmap bm){
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bm.compress(Bitmap.CompressFormat.PNG,100,baos);
    return baos.toByteArray();
}

byte[]转Bitmap

private Bitmap convertBytes2Bitmap(byte[] buff){
    Bitmap bm = BitmapFactory.decodeByteArray(buff,0,buff.length);
    return bm;
}

实现代码

发送Bitmap的Activity

Intent intent = new Intent(SendActivity.this, ReceiveActivity.class);
byte[] buff = convertBitmap2Bytes(cover);
intent.putExtra("buff",buff);
startActivity(intent);

接收Bitmap的Activity

Intent intent = getIntent();
if(intent!=null){
    byte[] buff = intent.getByteArrayExtra("buff");
    Bitmap bm = convertBytes2Bitmap(buff);
}