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在Activity间传递数据的四种方法及返回结果
1.通用方法
使用intent的PutExtra方法传入，用getExtra等方法获得数据
主类
Intent intent=new Intent(MainActivity.this,OtherActivity.class); intent.putExtra("name", "张三"); intent.putExtra("age", 23); intent.putExtra("address", "北京"); startActivity(intent);
other类
textView=(TextView) findViewById(R.id.msg); Intent intent=getIntent(); int age=intent.getIntExtra("age", 0); String name=intent.getStringExtra("name"); String address=intent.getStringExtra("address"); textView.setText("age--->>"+age+"name-->>"+name+"address-->>"+address);
2.利用静态变量传递
直接在主类中设置other类中的数据，进而实现主类到other类间的数据传递
主类
Intent intent=new Intent(); intent.setClass(MainActivity.this,OtherActivity.class); OtherActivity.age=23; OtherActivity.name="jack"; startActivity(intent);
other类
public class OtherActivity extends Activity{ private TextView textView; public static String name; public static int age; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.other); textView=(TextView) findViewById(R.id.msg); textView.setText("-name-->>"+name+"-age-->>"+age); }}
3.使用全局变量传递
创建myApp继承Application，通过设置Application中的数据，在Activity中传递
MyApp类
package com.example.intent4;import android.app.Application;public class MyApp extends Application{ public String name; public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public void onCreate() { super.onCreate(); setName("张三"); }}
主类
myApp=(MyApp) getApplication(); myApp.setName("jack");//修改之后的名称 Intent intent=new Intent(MainActivity.this,OtherActivity.class); startActivity(intent);
other类
textView=(TextView) findViewById(R.id.msg); myApp=(MyApp) getApplication(); textView.setText("-appname-->>"+myApp.getName());
4.使用剪切板(不太会用)
5.返回结果
package com.example.intent5;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;//返回结果public class MainActivity extends Activity { private EditText one,two,result; private Button button; private final static int REQUESTCODE=1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button=(Button) this.findViewById(R.id.calculate); one=(EditText) findViewById(R.id.one); two=(EditText) findViewById(R.id.two); result=(EditText) findViewById(R.id.result); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int a=Integer.parseInt(one.getText().toString()); int b=Integer.parseInt(two.getText().toString()); Intent intent=new Intent(MainActivity.this,OtherActivity.class); intent.putExtra("a", a); intent.putExtra("b", b); startActivityForResult(intent,REQUESTCODE);//可以返回结果 } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); //用于接受回传过来的值 if(resultCode==2){ if(requestCode==REQUESTCODE){ int three=data.getIntExtra("three", 0); result.setText(String.valueOf(three)); } } } }
package com.example.intent5;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class OtherActivity extends Activity { private Button button; private TextView textView; private EditText editText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.other); button=(Button) this.findViewById(R.id.button1); textView=(TextView) this.findViewById(R.id.msg); editText=(EditText) findViewById(R.id.editText); Intent intent=getIntent(); int a=intent.getIntExtra("a", 0); int b=intent.getIntExtra("b", 0); textView.setText(a+"+"+b+"="+"?"); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(); int three=Integer.parseInt(editText.getText().toString()); intent.putExtra("three", three); //通过Intent对象返回结果，setResult方法 setResult(2, intent); finish();//结束当前Activity的生命周期 } }); }}
注意：返回结果主类需要调用startForRexult方法及onActivityResult(),判断请求码及结果码是否正确，other类要写setResult(2, intent); finish();
在Activity间传递数据的四种方法及返回结果
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