Android startActivityForResult的使用

于 2012-05-09 10:37:00 发布
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文章标签： 移动开发 java
本文介绍如何在Android应用的不同组件间通过startActivityForResult进行数据传递。具体包括：从一个Activity启动另一个Activity进行特定操作，并将结果带回；实现这一过程的代码示例。

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Android startActivityForResult的使用

在Android中startActivityForResult主要作用就是:

A-Activity需要在B-Activtiy中执行一些数据操作，而B-Activity又要将，执行操作数据的结果返回给A-Activtiy


//看效果


//看代码

[java] view plain copy print ?
  1. packagesn.len.actres;
  3. importandroid.app.Activity;
  4. importandroid.content.Intent;
  5. importandroid.os.Bundle;
  6. importandroid.view.View;
  7. importandroid.view.View.OnClickListener;
  8. importandroid.widget.Button;
  9. importandroid.widget.TextView;
  11. publicclassActivityResultDemoActivityextendsActivity
  12. {
  13. privateButtonbutton_start_task;
  14. privateTextViewTextView_result;
  15. @Override
  16. publicvoidonCreate(BundlesavedInstanceState)
  17. {
  18. super.onCreate(savedInstanceState);
  19. setContentView(R.layout.main);
  20. button_start_task=(Button)findViewById(R.id.button_start_task);
  21. TextView_result=(TextView)findViewById(R.id.TextView_result);
  22. button_start_task.setOnClickListener(newbutton_start_task_Listener());
  23. }
  24. privateclassbutton_start_task_ListenerimplementsOnClickListener
  25. {
  26. publicvoidonClick(Viewv)
  27. {
  28. Intentintent=newIntent(ActivityResultDemoActivity.this,SimpleTaskActivity.class);
  29. //关键点来了，使用startActivityForResult来启动
  30. startActivityForResult(intent,100);
  31. }
  32. }
  33. /**
  34. *复写onActivityResult，这个方法
  35. *是要等到SimpleTaskActivity点了提交过后才会执行的
  36. */
  37. @Override
  38. protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata)
  39. {
  40. //可以根据多个请求代码来作相应的操作
  41. if(20==resultCode)
  42. {
  43. Stringbookname=data.getExtras().getString("bookname");
  44. Stringbooksale=data.getExtras().getString("booksale");
  45. TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元");
  46. }
  47. super.onActivityResult(requestCode,resultCode,data);
  48. }
  49. }
package sn.len.actres; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class ActivityResultDemoActivity extends Activity { private Button button_start_task; private TextView TextView_result; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button_start_task=(Button) findViewById(R.id.button_start_task); TextView_result=(TextView) findViewById(R.id.TextView_result); button_start_task.setOnClickListener(new button_start_task_Listener()); } private class button_start_task_Listener implements OnClickListener { public void onClick(View v) { Intent intent=new Intent(ActivityResultDemoActivity.this,SimpleTaskActivity.class); //关键点来了，使用startActivityForResult来启动 startActivityForResult(intent, 100); } } /** * 复写onActivityResult，这个方法 * 是要等到SimpleTaskActivity点了提交过后才会执行的 */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { //可以根据多个请求代码来作相应的操作 if(20==resultCode) { String bookname=data.getExtras().getString("bookname"); String booksale=data.getExtras().getString("booksale"); TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元"); } super.onActivityResult(requestCode, resultCode, data); } }
//任务处理类

[java] view plain copy print ?
  1. packagesn.len.actres;
  3. importandroid.app.Activity;
  4. importandroid.content.Intent;
  5. importandroid.os.Bundle;
  6. importandroid.view.View;
  7. importandroid.view.View.OnClickListener;
  8. importandroid.widget.Button;
  9. importandroid.widget.EditText;
  11. publicclassSimpleTaskActivityextendsActivity
  12. {
  13. privateEditTextEditText_bookname;
  14. privateEditTextEditText_booksale;
  15. privateButtonButton_task_fulfill;
  17. @Override
  18. protectedvoidonCreate(BundlesavedInstanceState)
  19. {
  20. super.onCreate(savedInstanceState);
  21. setContentView(R.layout.main2);
  23. EditText_bookname=(EditText)findViewById(R.id.EditText_bookname);
  24. EditText_booksale=(EditText)findViewById(R.id.EditText_booksale);
  25. Button_task_fulfill=(Button)findViewById(R.id.Button_task_fulfill);
  26. Button_task_fulfill.setOnClickListener(newButton_task_fulfill_Listener());
  27. }
  28. privateclassButton_task_fulfill_ListenerimplementsOnClickListener
  29. {
  30. publicvoidonClick(Viewv)
  31. {
  32. Stringstr_bookname=EditText_bookname.getText().toString();
  33. Stringstr_booksale=EditText_booksale.getText().toString();
  35. //判断空，我就不判断了。。。。
  36. Intentdata=newIntent();
  37. data.putExtra("bookname",str_bookname);
  38. data.putExtra("booksale",str_booksale);
  39. //请求代码可以自己设置，这里设置成20
  40. setResult(20,data);
  41. //关闭掉这个Activity
  42. finish();
  43. }
  44. }
  45. }
package sn.len.actres; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class SimpleTaskActivity extends Activity { private EditText EditText_bookname; private EditText EditText_booksale; private Button Button_task_fulfill; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main2); EditText_bookname=(EditText) findViewById(R.id.EditText_bookname); EditText_booksale=(EditText) findViewById(R.id.EditText_booksale); Button_task_fulfill=(Button) findViewById(R.id.Button_task_fulfill); Button_task_fulfill.setOnClickListener(new Button_task_fulfill_Listener()); } private class Button_task_fulfill_Listener implements OnClickListener { public void onClick(View v) { String str_bookname=EditText_bookname.getText().toString(); String str_booksale=EditText_booksale.getText().toString(); //判断空，我就不判断了。。。。 Intent data=new Intent(); data.putExtra("bookname", str_bookname); data.putExtra("booksale", str_booksale); //请求代码可以自己设置，这里设置成20 setResult(20, data); //关闭掉这个Activity finish(); } } }

在Android中startActivityForResult主要作用就是:

A-Activity需要在B-Activtiy中执行一些数据操作，而B-Activity又要将，执行操作数据的结果返回给A-Activtiy


//看效果


//看代码

[java] view plain copy print ?
  1. packagesn.len.actres;
  3. importandroid.app.Activity;
  4. importandroid.content.Intent;
  5. importandroid.os.Bundle;
  6. importandroid.view.View;
  7. importandroid.view.View.OnClickListener;
  8. importandroid.widget.Button;
  9. importandroid.widget.TextView;
  11. publicclassActivityResultDemoActivityextendsActivity
  12. {
  13. privateButtonbutton_start_task;
  14. privateTextViewTextView_result;
  15. @Override
  16. publicvoidonCreate(BundlesavedInstanceState)
  17. {
  18. super.onCreate(savedInstanceState);
  19. setContentView(R.layout.main);
  20. button_start_task=(Button)findViewById(R.id.button_start_task);
  21. TextView_result=(TextView)findViewById(R.id.TextView_result);
  22. button_start_task.setOnClickListener(newbutton_start_task_Listener());
  23. }
  24. privateclassbutton_start_task_ListenerimplementsOnClickListener
  25. {
  26. publicvoidonClick(Viewv)
  27. {
  28. Intentintent=newIntent(ActivityResultDemoActivity.this,SimpleTaskActivity.class);
  29. //关键点来了，使用startActivityForResult来启动
  30. startActivityForResult(intent,100);
  31. }
  32. }
  33. /**
  34. *复写onActivityResult，这个方法
  35. *是要等到SimpleTaskActivity点了提交过后才会执行的
  36. */
  37. @Override
  38. protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata)
  39. {
  40. //可以根据多个请求代码来作相应的操作
  41. if(20==resultCode)
  42. {
  43. Stringbookname=data.getExtras().getString("bookname");
  44. Stringbooksale=data.getExtras().getString("booksale");
  45. TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元");
  46. }
  47. super.onActivityResult(requestCode,resultCode,data);
  48. }
  49. }
package sn.len.actres; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class ActivityResultDemoActivity extends Activity { private Button button_start_task; private TextView TextView_result; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button_start_task=(Button) findViewById(R.id.button_start_task); TextView_result=(TextView) findViewById(R.id.TextView_result); button_start_task.setOnClickListener(new button_start_task_Listener()); } private class button_start_task_Listener implements OnClickListener { public void onClick(View v) { Intent intent=new Intent(ActivityResultDemoActivity.this,SimpleTaskActivity.class); //关键点来了，使用startActivityForResult来启动 startActivityForResult(intent, 100); } } /** * 复写onActivityResult，这个方法 * 是要等到SimpleTaskActivity点了提交过后才会执行的 */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { //可以根据多个请求代码来作相应的操作 if(20==resultCode) { String bookname=data.getExtras().getString("bookname"); String booksale=data.getExtras().getString("booksale"); TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元"); } super.onActivityResult(requestCode, resultCode, data); } }
//任务处理类

[java] view plain copy print ?
  1. packagesn.len.actres;
  3. importandroid.app.Activity;
  4. importandroid.content.Intent;
  5. importandroid.os.Bundle;
  6. importandroid.view.View;
  7. importandroid.view.View.OnClickListener;
  8. importandroid.widget.Button;
  9. importandroid.widget.EditText;
  11. publicclassSimpleTaskActivityextendsActivity
  12. {
  13. privateEditTextEditText_bookname;
  14. privateEditTextEditText_booksale;
  15. privateButtonButton_task_fulfill;
  17. @Override
  18. protectedvoidonCreate(BundlesavedInstanceState)
  19. {
  20. super.onCreate(savedInstanceState);
  21. setContentView(R.layout.main2);
  23. EditText_bookname=(EditText)findViewById(R.id.EditText_bookname);
  24. EditText_booksale=(EditText)findViewById(R.id.EditText_booksale);
  25. Button_task_fulfill=(Button)findViewById(R.id.Button_task_fulfill);
  26. Button_task_fulfill.setOnClickListener(newButton_task_fulfill_Listener());
  27. }
  28. privateclassButton_task_fulfill_ListenerimplementsOnClickListener
  29. {
  30. publicvoidonClick(Viewv)
  31. {
  32. Stringstr_bookname=EditText_bookname.getText().toString();
  33. Stringstr_booksale=EditText_booksale.getText().toString();
  35. //判断空，我就不判断了。。。。
  36. Intentdata=newIntent();
  37. data.putExtra("bookname",str_bookname);
  38. data.putExtra("booksale",str_booksale);
  39. //请求代码可以自己设置，这里设置成20
  40. setResult(20,data);
  41. //关闭掉这个Activity
  42. finish();
  43. }
  44. }
  45. }
package sn.len.actres; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class SimpleTaskActivity extends Activity { private EditText EditText_bookname; private EditText EditText_booksale; private Button Button_task_fulfill; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main2); EditText_bookname=(EditText) findViewById(R.id.EditText_bookname); EditText_booksale=(EditText) findViewById(R.id.EditText_booksale); Button_task_fulfill=(Button) findViewById(R.id.Button_task_fulfill); Button_task_fulfill.setOnClickListener(new Button_task_fulfill_Listener()); } private class Button_task_fulfill_Listener implements OnClickListener { public void onClick(View v) { String str_bookname=EditText_bookname.getText().toString(); String str_booksale=EditText_booksale.getText().toString(); //判断空，我就不判断了。。。。 Intent data=new Intent(); data.putExtra("bookname", str_bookname); data.putExtra("booksale", str_booksale); //请求代码可以自己设置，这里设置成20 setResult(20, data); //关闭掉这个Activity finish(); } } }

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