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Intent

显式启动：

Button button = (Button)findViewById(R.id.btn);

button.setOnClickListener(new OnClickListener(){

public void onClick(View view){

Intent intent = new Intent(IntentDemoActivity.this, NewActivity.class);

startActivity(intent);

}

});

隐式启动

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(“http://www.google.com.hk“));

startActivity(intent);

获取Activity返回值：

显式

int SUBACTIVITY1 = 1;

Intent intent = new Intent(this, SubActivity1.class);

startActivityForResult(intent, SUBACTIVITY1);

隐式

int SUBACTIVITY2 = 2;

Uri uri = Uri.parse(“content://contacts/people”);

Intent intent = new Intent(Intent.ACTION_PICK, uri);

startActivityForResult(intent, SUBACTIVITY2);

设置返回值

Uri data = Uri.parse(“tel:” + tel_number);

Intent result = new Intent(null, data);

result.putExtra(“address”, “JD Street”);

setResult(RESULT_OK, result);

finish();

获取返回值：

private static final int SUBACTIVITY1 = 1;

private static final int SUBACTIVITY2 = 2;

@Override

public void onActivityResult(int requestCode, int resultCode, Intent data){

Super.onActivityResult(requestCode, resultCode, data);

switch(requestCode){

case SUBACTIVITY1:

if (resultCode == Activity.RESULT_OK){

Uri uriData = data.getData();

}else if (resultCode == Activity.RESULT_CANCEL){

}

break;

case SUBACTIVITY2:

if (resultCode == Activity.RESULT_OK){

Uri uriData = data.getData();

}

break;

}

}