Question

我有三个活动，A，B和C（下面的代码）。 A用startActivityforResult调用B，并覆盖onActivityResult，B也用ActivityforResult调用C，并且onActivityResult将结果返回给A。我的问题是onActivityResult没有被触发。我认为这是由于我要从onCreate之外的函数完成Activity，但我没有头绪。

我尝试寻找其他答案，但没有成功。

我已经尝试过Intents，但似乎都没有用。

MainActivity.java

Button btn = findViewById(R.id.add);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addReminder();
            }
        });


      } //Finish of onCreate

    private void addReminder(){
        Intent intent = new Intent(this, AddRecActivity.class);
        startActivityForResult(intent, RESULT_OK);

public void refresh() {
        Intent intent = getIntent();
        overridePendingTransition(0, 0);
        intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
        finish();
        overridePendingTransition(0, 0);
        startActivity(intent);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        refresh();
    }
    }

AddRecActivity.java

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                cursor.moveToPosition(position);
                Medicina med = new Medicina(cursor);
                Intent intent = new Intent(AddRecActivity.this, RecFinishActivity.class);
                intent.putExtra("NAME", med.getName());
                intent.putExtra("QUANTITY", med.getQuantity());
                intent.putExtra("TYPE", med.getType());
                intent.putExtra("PILLS", med.getPills());
                startActivityForResult(intent, RESULT_OK);
            }
        });

    }//onCreate end here
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(RESULT_OK == resultCode){
            Log.i("Insercion:", "Insercion correcta");
        } else {
            Log.i("Insercion:", "Insercion fallida");
        }
        setResult(RESULT_OK);
        finish();
    }

RecFinishActivity.java

btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addRec(data.getString("NAME"), data.getInt("QUANTITY"), data.getString("TYPE"),
                        data.getInt("PILLS"));
            }
        });
    } //onCreate end here

    void addRec(String name, int quantity, String type, int pills){
        Consumo con = new Consumo(name, quantity, type, pills, true, Integer.parseInt(min.getText().toString()));
        long success = sRegistrosDbHelper.saveConsumo(con);
        setResult(RESULT_OK);
        finish();
    }

RecFinishActivity finish（）可以正常工作，但是不会触发AddRecActivity onResultActivity，因此此Activity不会完成，MainActivity也不会得到结果。

预期的行为：C完成，B触发onResultActivity并完成，A触发onResultActivity并刷新活动。

Answer 1

StartActivityForResult将意图和requestCode作为参数。您正在传递RESULT_OK。尝试每次创建一个唯一的代码（它可以是任何整数），然后在onActivityResult上查找该特定的requestCode。

Intent i = new Intent(ActivityA.this, ActivityB.class);
startActivityForResult(i, 100); //I'm using 100 as a requestCode

如果要在ActivityB上将结果设置为“确定”：

Intent returnIntent = new Intent(); //use this intent if you want to send dat back to the other activity
setResult(Activity.RESULT_OK,returnIntent);
finish();

及其答案：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == 100) {
        if(resultCode == Activity.RESULT_OK){
            //do something
        }
        if (resultCode == Activity.RESULT_CANCELED) {
            //do something if there's no result
        }
    }
}

Answer 2

here your problem is startActivityForResult(intent, RESULT_OK); , the value of RESULT_OK is -1 which is ignored by internal call from startActivityforResult use any other request code like 
MainActivity :`
    Button btn = findViewById(R.id.add);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addReminder();
            }
        });


      } //Finish of onCreate

    private void addReminder(){
        Intent intent = new Intent(this, AddRecActivity.class);
        startActivityForResult(intent, 100);

public void refresh() {
        Intent intent = getIntent();
        overridePendingTransition(0, 0);
        intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
        finish();
        overridePendingTransition(0, 0);
        startActivity(intent);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        refresh();
    }
    }


`AddRecActivity.java`
    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                cursor.moveToPosition(position);
                Medicina med = new Medicina(cursor);
                Intent intent = new Intent(AddRecActivity.this, RecFinishActivity.class);
                intent.putExtra("NAME", med.getName());
                intent.putExtra("QUANTITY", med.getQuantity());
                intent.putExtra("TYPE", med.getType());
                intent.putExtra("PILLS", med.getPills());
                startActivityForResult(intent, 100);
            }
        });

    }//onCreate end here
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(100 == requestCode){
            Log.i("Insercion:", "Insercion correcta");
        } else {
            Log.i("Insercion:", "Insercion fallida");
        }
        setResult(RESULT_OK);
        finish();
    }


`RecFinishActivity.java
`
    btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addRec(data.getString("NAME"), data.getInt("QUANTITY"), data.getString("TYPE"),
                        data.getInt("PILLS"));
            }
        });
    } //onCreate end here

    void addRec(String name, int quantity, String type, int pills){
        Consumo con = new Consumo(name, quantity, type, pills, true, Integer.parseInt(min.getText().toString()));
        long success = sRegistrosDbHelper.saveConsumo(con);
        setResult(RESULT_OK);
        finish();
    }`
you can use any value in request code other than 100,101, non negative value

onActivityResult未触发

2 个答案: