【移动应用开发技术】Activity 之间的交互

【移动应用开发技术】Activity之间的交互

在第一个activity中使用startActivityForResult(intent,state_tag);启动第二个activity，在第二个activity中调用setResult（，）在第一个activity中重载onActivityResult（）第一个Activity：publicclassMainActivityextendsActivity{

privateTextViewtv=null;

privateintstate_tag=1;

@Override

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tv=(TextView)findViewById(R.id.textView);

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

button.setOnClickListener(newView.OnClickListener(){

@Override

publicvoidonClick(Viewarg0){

//TODOAuto-generatedmethodstub

Intenti=newIntent(MainActivity.this,SecondActivity.class);

Bundlebundle=newBundle();

bundle.putString("content",tv.getText().toString());

i.putExtra("bundle",bundle);

startActivityForResult(i,state_tag);

}

});

}

@Override

publicbooleanonCreateOptionsMenu(Menumenu){

//Inflatethemenu;thisaddsitemstotheactionbarifitispresent.

getMenuInflater().inflate(R.menu.main,menu);

returntrue;

}

@Override

protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata){

//TODOAuto-generatedmethodstub

super.onActivityResult(requestCode,resultCode,data);

if(requestCode==state_tag)

{

if(resultCode==RESULT_OK)

{

Log.i("MainActivity",data.getBundleExtra("bundle2").getString("newContend"));

tv.setText(data.getBundleExtra("bundle2").getString("newContend"));

}

else

{

Log.i("MainActivity","inelse:");

return;

}

}

}

}第二个activity：enttest;

importandroid.app.Activity;

importandroid.content.Intent;

importandroid.os.Bundle;

importandroid.view.View;

importandroid.widget.Button;

importandroid.widget.EditText;

publicclassSecondActivityextendsActivity{

privateEditTexteditText=null;

privateButtonokButton=null;

privateButtoncancelButton=null;

@Override

protectedvoidonCreate(BundlesavedInstanceState){

//TODOAuto-generatedmethodstub

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_second);

editText=(EditText)findViewById(R.id.editText);

okButton=(Button)findViewById(R.id.okButton);

cancelButton=(Button)findViewById(R.id.cancelButton);

Intenti=getIntent();

editText.setText(i.getBundleExtra("bundle").getString("content"));

okButton.setOnClickListener(newView.OnClickListener(){

@Override

publicvoidonClick(Viewarg0){

//TODOAuto-generatedmethodstub

Intenti=newIntent(SecondActivity.this,MainActivity.class);

Bundlebundle=newBundle();

bundle.putString("newContent",String.valueOf(editText.getText()));

i.putExtra("bundle2",bundle);

setResult(RESULT_OK,i);

finish();

}

});

cancelButton.setOnClickListener(newView.OnClickListener(){

@Override

publicvoidonClick(Viewarg0){

//TODOAuto-generatedmethodstub

setResult(RESULT_CANCELED);

finish();

}

});

}

@Override